+--------------------------------------------------+-------------------+
| DIGITAL CHART OF THE WORLD (DCW) DATA            |   ---             |
| DESCRIPTION\                                     |  ---------------- |
| \                                                | ----------------- |
| TABLE OF CONTENTS:\                              | ----------------- |
| \                                                |                   |
| 1.What is The Digital Chart of the World? 2.How  |    [** Sponsors** |
| the data set was changed 3.Arc/INFO users        | ](http://www.geoc |
| 5.ArcView users 6.Known errors and fixes         | omm.com/sponsor/) |
| 7.Contact us\                                    |                   |
| \                                                |   ---             |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |  ---------------- |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- | ----------------- |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--\ | ----------------- |
| \                                                |                   |
| What is the Digital Chart of the World?\         | ![](media/image1  |
| \                                                | .png){width="1.30 |
| The Digital Chart of the World (DCW) is an       | 20833333333333in" |
| Environmental Systems Research Institute, Inc.   | height="1.302     |
| (ESRI) product originally developed for the US   | 0833333333333in"} |
| Defense Mapping Agency (DMA) using DMA data. The |                   |
| DCW 1993 version at 1:1,000,000 scale was used.  | ![](media/image2  |
| The DMA data sources are aeronautical charts,    | .gif){width="1.30 |
| which emphasize landmarks important from flying  | 20833333333333in" |
| altitudes. This explains why there is a separate | height="1.302     |
| aeronautical theme with all conceivable          | 0833333333333in"} |
| airports, yet why on some themes small islands   |                   |
| and lakes are simply unnamed points. ESRI, in    | ![](media/image3  |
| compiling the DCW, also eliminated some detail   | .gif){width="1.30 |
| and made some assumptions for handling tiny      | 20833333333333in" |
| polygons and edgematching. Also, note that the   | height="1.302     |
| completeness of the thematic categories present  | 0833333333333in"} |
| in each layer will vary. Please read the layer   |                   |
| descriptions (through links in the following     | [For              |
| table).\                                         | information[\     |
| \                                                | ]{.unde           |
| Available Themes: Type: Coverage Name            | rline}regarding[\ |
| Political/Ocean Network PONET Populated Places   | ]{.unde           |
| Polygon PPPOLY Populated Places Point PPPOINT    | rline}advertising |
| Railroads Line RRLINE Roads Line RDLINE          | rates[\           |
| Utilities Line UTLINE Drainage Network DNNET     | ]                 |
| Drainage Point DNPOINT Drainage Supplemental     | {.underline}Click |
| Point DSPOINT Hypsography Network HYNET          | Here!             |
| Hypsography Line HYPOINT Hypsography             | ](http://www.geoc |
| SupplementalLine HSLINE Hypsography              | omm.com/sponsor/) |
| SupplementalPoint HSPOINT Land Cover Polygon     |                   |
| LCPOLY Land Cover Point LCPOINT Ocean Features   |                   |
| Point OFPOINT Ocean Features Line OFLINE         |                   |
| Physiography Line PHLINE Aeronautical Point      |                   |
| AEPOINT Cultural Landmarks Polygon CLPOLY        |                   |
| Cultural Landmarks Point CLPOINT Cultural        |                   |
| Landmarks Line CLLINE Transportation             |                   |
| StructureLine TSLINE Transportation              |                   |
| StructurePoint TDPOINT Vegetation Polygon        |                   |
| VGPOLY\                                          |                   |
| \                                                |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--\ |                   |
| \                                                |                   |
| How the data set was changed\                    |                   |
| \                                                |                   |
| The original format of the DCW from ESRI has     |                   |
| 2094 separate Arc/INFO workspaces. Each          |                   |
| workspace is bounded by latitude and longitude,  |                   |
| 5-by-5 degrees. Each can contain up to 25        |                   |
| different thematic layers (see list below). The  |                   |
| original workspaces was compiled into countries, |                   |
| territories and states; our server contains      |                   |
| about 340 of these areas, from the original 2094 |                   |
| workspaces. The parts of the tiles were          |                   |
| aggregated one country at a time, and used each  |                   |
| country-boundary coverage as a \"cookie cutter\" |                   |
| to select the thematic data according to country |                   |
| boundaries.\                                     |                   |
| \                                                |                   |
| \                                                |                   |
| \                                                |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--\ |                   |
| \                                                |                   |
| For Arc/INFO users\                              |                   |
| \                                                |                   |
| Every line coverage needs to be cleaned and      |                   |
| every point coverage needs to be built. For line |                   |
| coverages use the Arc command CLEAN, and for     |                   |
| point coverages use the Arc command BUILD.\      |                   |
| \                                                |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--\ |                   |
| \                                                |                   |
| ArcView users\                                   |                   |
| \                                                |                   |
| According to the ArcView online help, coverages  |                   |
| with more than 5000 arcs can not be imported     |                   |
| into ArcView2 (Windows 3.x) using its import     |                   |
| program. The following export (.e00) files       |                   |
| contain more than 5000 arcs, thus ArcView2       |                   |
| cannot import them as a theme. Therefore,        |                   |
| Arc/INFO\'s IMPORT function must be used to      |                   |
| create the coverage. You can then open the new   |                   |
| coverage as a theme in ArcView.\                 |                   |
| \                                                |                   |
| It may be possible to use the ArcView3 import    |                   |
| function for NT or UNIX machines.\               |                   |
| \                                                |                   |
| \                                                |                   |
| \                                                |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--\ |                   |
| \                                                |                   |
| Known errors and fixes\                          |                   |
| \                                                |                   |
| The PONET layer for the following areas may have |                   |
| lost some items in the .pat file, and may not    |                   |
| include an .aat file at all. This is because of  |                   |
| an error using the Arc/INFO DISSOLVE command.    |                   |
| The ponet layers is a network coverage, thus is  |                   |
| has an .aat and a .pat info file. While          |                   |
| compiling these areas the dissolve command may   |                   |
| have deleted the .aat and deleted all the items  |                   |
| in the .pat except the dissolve item.\           |                   |
| \                                                |                   |
| Antarctica Australia\                            |                   |
| \                                                |                   |
| South Australia Brazil Greenland Mali Mexico     |                   |
| Canada China Turkey United States\               |                   |
| \                                                |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\  |                   |
| -\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\ |                   |
| -\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-- |                   |
| Coverages with manual ArcEdit changes to close   |                   |
| boundary polygons:\                              |                   |
| \                                                |                   |
| Area Layer China PONET Alaska PONET Brazil PONET |                   |
| Greenland PONET United StatesPONET Turkey PONET  |                   |
| Australia PONET Mexico PONET added UNKNOWN in    |                   |
| popyadmin item Mali PONET\                       |                   |
| \                                                |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\  |                   |
| -\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\ |                   |
| -\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-- |                   |
| Redefined items (template coverage used in the   |                   |
| Arc APPEND command)\                             |                   |
| \                                                |                   |
| TileLayer Area Date Fixed gg32rdline Panama and  |                   |
| Colombia 1/28/97 mj31tsline Morocco 2/3/97       |                   |
| mj32dnnet France 2/22/97 gg21rdline Ecuador      |                   |
| 1/28/97 hg12rdline Colombia 1/28/97 nm31?        |                   |
| Svalbard 1/15/97 pm11? Svalbard 1/15/97 pm21?    |                   |
| Svalbard 1/15/97 pm31? Svalbard 1/15/97\         |                   |
| \                                                |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--\ |                   |
| \                                                |                   |
| Miscode Errors\                                  |                   |
| \                                                |                   |
| The original ESRI tile PG31, item popycoun is    |                   |
| miscoded, thus some national boundaries were     |                   |
| wrong. The affected areas were: Uganda, Central  |                   |
| African Republic, Zaire, and the Sudan. Our data |                   |
| was fixed on 1/23/97.\                           |                   |
| \                                                |                   |
| The original ESRI tiles XH32, XH31, XG33, XG23,  |                   |
| and YG12 PONET coverages popycoun item was       |                   |
| recoded on 1/13/97. The affected areas were:     |                   |
| Federated States of Micronesia, Guam, and the    |                   |
| Northern Mariana Islands.\                       |                   |
| \                                                |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--\ |                   |
| \                                                |                   |
| Compile Errors\                                  |                   |
| \                                                |                   |
| Other errors in the original DCW tiles were      |                   |
| found when our AML script tried to compile the   |                   |
| layers in the following list. 0ur data was       |                   |
| corrected using the Arc command CLEAN, in 1/97:\ |                   |
| \                                                |                   |
| TileLayer Area Error Message FATAL ERROR         |                   |
| pj21lcpoly Greece Mismatch of border segments    |                   |
| (NODPOL) Bailing out of BUILD FATAL ERROR        |                   |
| pj21lcpoly Egypt Mismatch of border segments     |                   |
| (NODPOL) Bailing out of BUILD FATAL ERROR        |                   |
| th33hynet Bhutan Bad polygon topology            |                   |
| (ARCPAL_new) Bailing out of BUILD FATAL ERROR    |                   |
| th33hynet India Bad polygon topology             |                   |
| (ARCPAL_new) Bailing out of BUILD FATAL ERROR    |                   |
| rj11hynet Kuwait Bad polygon topology            |                   |
| (ARCPAL_new) Bailing out of BUILD FATAL ERROR    |                   |
| vh22hynet Macau Bad polygon topology             |                   |
| (ARCPAL_new) Bailing out of BUILD FATAL ERROR    |                   |
| th33hynet Nepal Mismatch of border segments      |                   |
| (NODPOL) Bailing out of BUILD FATAL ERROR        |                   |
| ????hynet Hong Kong Bad polygon topology         |                   |
| (ARCPAL_new) Bailing out of BUILD\               |                   |
| \                                                |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--\ |                   |
| \                                                |                   |
| Data Sources\                                    |                   |
| \                                                |                   |
| The U.S. Defense Mapping Agency Operational      |                   |
| Navigation Chart (ONC) series and the Jet        |                   |
| Navigation Charts (JNCs) for the region of       |                   |
| Antarctica were the primary sources for the      |                   |
| Digital Chart of the World database. The ONCs    |                   |
| have a scale of 1:1,000,000, and they are the    |                   |
| largest scale, unclassified map series produced  |                   |
| by the DMA that provides consistent, continuous  |                   |
| global coverage of essential basemap features.\  |                   |
| \                                                |                   |
| Some collateral sources have been used to        |                   |
| enhance road and railroad connectivity through   |                   |
| selected urbanized areas. The DMA\'s Digital     |                   |
| Aeronautical Flight Information File (DAFIF) was |                   |
| the primary source for the aeronautical layer.   |                   |
| An advanced Very High Resolution Radiometer      |                   |
| (AVHRR) image for the coterminous United States  |                   |
| is the source for the data in the Vegetation     |                   |
| layer. The Defense Intelligence Agency Manual    |                   |
| (DIAM) 65-18 is the source for the Geopolitical  |                   |
| codes and the ocean boundaries information       |                   |
| contained in the Political and Oceans layer. The |                   |
| product specifications for the ONCs and JNCs     |                   |
| have been used extensively in the design of the  |                   |
| database.\                                       |                   |
| \                                                |                   |
| The 1:1,000,000-scale ONCs were designed to meet |                   |
| the needs of the pilots and air crews in medium- |                   |
| and low-altitude en route navigation by visual   |                   |
| and other techniques. The ONC series was also    |                   |
| designed to support military operational         |                   |
| planning, intelligence briefings, preparation of |                   |
| visual cockpit displays, and other DMA uses. It  |                   |
| is necessary to be mindful of the original       |                   |
| purpose of the source of data when evaluating    |                   |
| the suitability of this database for your own    |                   |
| applications.\                                   |                   |
| \                                                |                   |
| Operational Navigation Chart (ONC) Product       |                   |
| Specification are designed and produced to       |                   |
| support medium altitude en route navigation by   |                   |
| dead reckoning, visual pilotage, celestial,      |                   |
| radar, and other techniques. These charts are    |                   |
| also widely used for mission planning/analysis,  |                   |
| intelligence briefings, and the preparation of   |                   |
| visual cockpit navigational display/navigational |                   |
| filmstrips. They provide a small scale (little   |                   |
| detail) translation of the cultural and terrain  |                   |
| features for the pilots/navigators flying at     |                   |
| medium (2,000 feet to 25,000 feet AGL) and low   |                   |
| altitudes (500 feet to 2,000 feet AGL).\         |                   |
| \                                                |                   |
| (excerpted from the Digital Chart of the World   |                   |
| Data Dictionary)\                                |                   |
| \                                                |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--\ |                   |
| \                                                |                   |
| Edgematching and Line Connectivity/Polygon       |                   |
| Closure\                                         |                   |
| \                                                |                   |
| Edgematching of production modules (the          |                   |
| nonoverlap areas of the ONCs and JNCs) was       |                   |
| accomplished manually. The basic objective was   |                   |
| to establish a cartographically pleasing match   |                   |
| across ONC boundaries whenever possible. The     |                   |
| most accurate and/or current modules were given  |                   |
| priority. In poorly mapped areas of the world,   |                   |
| severe feature offsets do occur. In these        |                   |
| extreme cases of feature offset, no edgematching |                   |
| was attempted because the degree of the offset   |                   |
| made the differences irreconcilable. Significant |                   |
| feature offsets also occur in the instances      |                   |
| where the source materials used to compile the   |                   |
| ONCs could not be reconciled. These type of      |                   |
| situations may be located anywhere in a tile.\   |                   |
| \                                                |                   |
| Some Digital Chart of the World layers are       |                   |
| developed from ONC separates that do not contain |                   |
| the necessary connectivity or closure for the    |                   |
| linear and polygonal features represented. For   |                   |
| example, road segments are broken on the         |                   |
| separates for the text and urbanized area        |                   |
| polygons. These breaks in connectivity were      |                   |
| usually resolved at the map preparation stage.\  |                   |
| \                                                |                   |
| (excerpted from the Digital Chart of the World   |                   |
| Data Dictionary)\                                |                   |
| \                                                |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--\ |                   |
| \                                                |                   |
| Layer Descriptions\                              |                   |
| \                                                |                   |
| Political and Oceans layer\                      |                   |
| \                                                |                   |
| Coverage name: PONET Feature class type: Polygon |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| POPYTYPE Political/Oceans polygon type\          |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Land 2. = Open Ocean 3. = Polar ice (on     |                   |
| water)\* 4. = Pack ice (on water)\* 5. = Shelf   |                   |
| ice\*\                                           |                   |
| \                                                |                   |
| \* Ice on land is contained in the DNNET         |                   |
| coverage. These phenomena occur only on          |                   |
| Antarctica, where extensive portions of the      |                   |
| land/ocean shoreline is covered by ice.\         |                   |
| \                                                |                   |
| Coverage name: PONET Feature class type: Line    |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| POLNTYPE Political/Oceans line type\             |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = International boundary, de jure 2. =        |                   |
| International boundary, de facto 3. =            |                   |
| International boundary, de jure and de facto 4.  |                   |
| = Subnational administrative boundary, first     |                   |
| order 5. = Subnational administrative boundary,  |                   |
| second order 6. = Treaty or occupational line    |                   |
| (demilitarized zones) 7. = Coastal closure line  |                   |
| (used to connect ocean shoreline across river    |                   |
| mouths, glaciers, lagoons, fjords, and so forth) |                   |
| 8. = Ocean demarcation line (used to separate    |                   |
| ocean aggregations) 9. = Ice line (used to       |                   |
| separate types of sea ice) 10. = Coastline 11. = |                   |
| Ocean/Sea ice boundary 12. = Seawall 13. =       |                   |
| International date line\                         |                   |
| \                                                |                   |
| 88. = Arbitrary connector (if needed)\           |                   |
| \                                                |                   |
| 99. = None (used for tile border)\               |                   |
| \                                                |                   |
| POLNSTAT Political ocean line status\            |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Definite (boundary or coastline) 2. =       |                   |
| Approximate (boundary) or fluctuating            |                   |
| (coastline) 3. = Indefinite (boundary or         |                   |
| unsurveyed (coastline) 4. = Man-made (coastline) |                   |
| (dike) 5. = Indeterminable (coastline) 6. = Ice  |                   |
| cliff (when coincident with the coastline or ice |                   |
| line) 7. = Political boundary (that is, based on |                   |
| single-line river or stream location) 8. =       |                   |
| Connector (international or administrative       |                   |
| boundary extensions through inland water areas)  |                   |
| 9. = 5- degree by 5-degree tile boundary\        |                   |
| \                                                |                   |
| 88. = ONC module boundary section retained to    |                   |
| provide \"edgematch\" connection across ONC      |                   |
| sheets\                                          |                   |
| \                                                |                   |
| Populated Place layer\                           |                   |
| \                                                |                   |
| Coverage name: PPPOLY Feature class type:        |                   |
| Polygon Items, codes, and values\                |                   |
| \                                                |                   |
| PPPYTYPE Populated place polygon type. This      |                   |
| coverage contains depictions of the urbanized    |                   |
| areas (built-up areas) of the world that can be  |                   |
| represented as polygons at 1:1,000,000 scale.    |                   |
| The built-up areas represent the shape of an     |                   |
| urbanized area as viewed by the air observer.    |                   |
| These outlines do not necessarily conform to     |                   |
| political boundaries.\                           |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Urbanized area 2. = Kampong (small villages |                   |
| or groups of houses, especially in Southeast     |                   |
| Asia)\                                           |                   |
| \                                                |                   |
| 10. = None (non-urbanized area within urbanized  |                   |
| area)\                                           |                   |
| \                                                |                   |
| Coverage name: PPPOINT Feature class type: Point |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| PPPTTYPE Populated place point type.\            |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Populated place (no subcategories\*) 2. =   |                   |
| Populated place (associated with place names     |                   |
| within urbanized areas) 3. = Village, strategic, |                   |
| or landmark place associated with a special      |                   |
| symbol identified with an ONC marginal note 4. = |                   |
| Kampong (small villages or groups of houses,     |                   |
| especially in Southeast Asia) 5. = Circular      |                   |
| Village\                                         |                   |
| \                                                |                   |
| \* On ONCs there are different symbols and text  |                   |
| sizes for differentiating the size or relative   |                   |
| importance of populated places. The rank value   |                   |
| associated with these symbols varies from sheet  |                   |
| to sheet; for that reason, no attempt was made   |                   |
| to code for the different populated place        |                   |
| symbols in the database.\                        |                   |
| \                                                |                   |
| PPPTNAME Place name. The item PPPTNAME contains  |                   |
| a thirty-character field to carry the specific   |                   |
| name of the populated feature as it appears on   |                   |
| the ONC. Names are contained in this item.\      |                   |
| \                                                |                   |
| Railroad layer\                                  |                   |
| \                                                |                   |
| Coverage name: RRLINE Feature class type: Line   |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| RRLNTYPE Railroad line type.\                    |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Single track railroad 2. = Multiple track   |                   |
| railroad 3. = Light-duty railroad, including     |                   |
| carlines, tramways, and other similar            |                   |
| light-load-bearing railways\                     |                   |
| \                                                |                   |
| 8. = Added railroad connector within urbanized   |                   |
| area polygons\                                   |                   |
| \                                                |                   |
| RRLNSTAT Railroad line status\                   |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Functioning 2. = Nonoperating, abandoned,   |                   |
| destroyed, or under construction 3. = Existence  |                   |
| doubtful or \"reported\" to exist 4. = Compiled  |                   |
| railroads (used for arcs added from other source |                   |
| materials in order to provide cartographically   |                   |
| correct connectivity within the urbanized area   |                   |
| polygons) 5. = Compiled from adjacent more       |                   |
| recent map sheet (used for arcs added for        |                   |
| edgematch or connectivity in the ONC sheet       |                   |
| overlap areas) 6. = Compiled, under construction |                   |
| (used for arcs added for edgematch or            |                   |
| connectivity in the ONC sheet overlap areas)\    |                   |
| \                                                |                   |
| 8. = Schematic rail line (used for arcs added    |                   |
| within the urbanized area polygons for network   |                   |
| connectivity only)\                              |                   |
| \                                                |                   |
| Road layer\                                      |                   |
| \                                                |                   |
| Coverage name: RDLINE Feature class type: Line   |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| RDLNTYPE Road line type\                         |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Dual lane (divided) highway 2. = Primary    |                   |
| and secondary road 3. = Track, trail, or         |                   |
| footpath\                                        |                   |
| \                                                |                   |
| 8. = Added road connector within urbanized area  |                   |
| polygons\                                        |                   |
| \                                                |                   |
| RDLNSTAT Road line status\                       |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Functioning 2. = Under construction 3. =    |                   |
| Existence doubtful or \"reported\" to exist 4. = |                   |
| Compile road connector (used for arcs added from |                   |
| other source materials in order to provide       |                   |
| cartographically correct connectivity within     |                   |
| urbanized area polygons) 5. = Compiled from      |                   |
| adjacent, more recent sheet (used for arcs added |                   |
| for edgematch or network connectivity in the ONC |                   |
| sheet overlap areas) 6. = Compiled, under        |                   |
| construction (used for arcs added for edgematch  |                   |
| or network connectivity in the ONC sheet overlap |                   |
| areas)\                                          |                   |
| \                                                |                   |
| 9. = Schematic road (used for arcs added within  |                   |
| the urbanized area polygons for network          |                   |
| connectivity only)\                              |                   |
| \                                                |                   |
| Utilities layer\                                 |                   |
| \                                                |                   |
| Coverage name: UTLINE Feature class type: Line   |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| UTLNTYPE Utility line type\                      |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Power transmission line 2. = Telephone or   |                   |
| telegraph line 3. = Above-ground pipeline 4. =   |                   |
| Underground pipeline\                            |                   |
| \                                                |                   |
| Drainage layer\                                  |                   |
| \                                                |                   |
| Coverage name: DNNET Feature class type: Polygon |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| DNPYTYPE Drainage feature type\                  |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Perennial inland water. Includes perennial  |                   |
| lakes and streams, estuaries, lagoons,           |                   |
| unsurveyed perennial streams, reservoirs, and    |                   |
| navigable canals 2. = Nonperennial inland water. |                   |
| Includes nonperennial and seasonally fluctuating |                   |
| lakes and streams, wadis, sabkhas, and abandoned |                   |
| navigable canals 3. = Wet sand. Includes wet     |                   |
| sand and sand deposits in and along riverbeds 4. |                   |
| = Snowfields, glacier, ice fields, or ice caps\  |                   |
| \                                                |                   |
| 9. = None. This code is used for any area that   |                   |
| is not water, wet sand, snowfield, glacier, ice  |                   |
| field or ice cap. Polygons with this code would  |                   |
| include the background polygon, islands within   |                   |
| inland water or ice areas, land areas enclosed   |                   |
| by stream or river courses, or ocean areas.\     |                   |
| \                                                |                   |
| Coverage name: DNNET Feature class type: Line    |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| DNLNTYPE Drainage line type\                     |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Stream, river, channelized river 2. =       |                   |
| Inland water body shoreline 3. = Wet sand limit  |                   |
| 4. = Canal, aqueduct, flume, penstock, kanat, or |                   |
| similar feature (clearly identified by ONC map   |                   |
| annotation) 5. = Glacial limit 6. = Snowfield,   |                   |
| glacier, or land ice water ice or ocean limit 7. |                   |
| = Ice free limit (land/ice line) 8. = Connector  |                   |
| (used to separate inland water from open ocean   |                   |
| or ocean ice)\* 9. = Tile boundary or null arc\  |                   |
| \                                                |                   |
| \*These lines were derived from the border       |                   |
| between the shade for inland water (dark blue)   |                   |
| and open ocean or ocean ice (light blue) on the  |                   |
| ONC sheets. The cartographic judgements applied  |                   |
| to the use of open ocean versus inland water     |                   |
| shading in near shore situations varies from     |                   |
| sheet to sheet,\                                 |                   |
| \                                                |                   |
| DLNSTAT Drainage line status.\                   |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Perennial (used for rivers and streams      |                   |
| only) 2. = Nonperennial (used for rivers and     |                   |
| streams only) 3. = Definite (used for inland     |                   |
| shorelines only) 4. = Indefinite (used for       |                   |
| inland shorelines only) 5. = Unsurveyed          |                   |
| perennial 6. = Unsurveyed nonperennial 7. =      |                   |
| Abandoned 8. = Under construction 9. = Suspended |                   |
| or elevated 10. = Underground 11. = Above        |                   |
| ground\                                          |                   |
| \                                                |                   |
| 88. = Tile boundary\                             |                   |
| \                                                |                   |
| 99. = None (no status attribute associated with  |                   |
| feature)\                                        |                   |
| \                                                |                   |
| Coverage name: DNPOINT Feature class type: Point |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| DNPTTYPE Drainage point type.\                   |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Spring, well, waterhole, or bore 2. = Small |                   |
| reservoir 3. = Falls 4. = Rapids 5. = Lock 6. =  |                   |
| Dam\* 7. = Sluice gate\                          |                   |
| \                                                |                   |
| \*Those dams shown on the ONCs with their true   |                   |
| shape and extent are also present as line data   |                   |
| in the Cultural Landmark layer.\                 |                   |
| \                                                |                   |
| Supplemental Drainage Layer\                     |                   |
| \                                                |                   |
| Coverage name: DSPOINT Feature class type: Point |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| DSPTTYPE Supplemental drainage point type. This  |                   |
| item contains those ONC drainage features which  |                   |
| could not be captured as polygons during the     |                   |
| scanning process. Polygons less than 0.12 inches |                   |
| in circumference were automated as point         |                   |
| features. The resulting point location is        |                   |
| located on the perimeter of the former polygon   |                   |
| feature.\                                        |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Small lake, inland water body (lakes,       |                   |
| reservoirs, lagoons) 2. = Small island within    |                   |
| inland water areas\                              |                   |
| \                                                |                   |
| Hypsography layer\                               |                   |
| \                                                |                   |
| Coverage name: HYNET Feature class type: Polygon |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| HYPYTYPE Hypsography polygon type. The           |                   |
| hypsography polygons are coded to form elevation |                   |
| zones, as indicated in the classification scheme |                   |
| below.\                                          |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Below mean sea level 2. = 0 to 1,000 feet   |                   |
| above mean sea level 3. = 1,000 to 3,000 feet 4. |                   |
| = 3,000 to 7,000 feet 5. = 7,000 to 11,000 feet  |                   |
| 6. = 11,000 feet and above 7. = Uncontoured or   |                   |
| unsurveyed 8. = Area does not have a 1,000-foot  |                   |
| contour interval (only exists on JNC) 9. = None\ |                   |
| \                                                |                   |
| Coverage name: HYNET Feature class type: Line    |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| HYLNVAL Hypsography line value. The item HYLNVAL |                   |
| contains the elevation value of the contour line |                   |
| expressed as feet above mean sea level. When     |                   |
| contour lines for different elevations become    |                   |
| coincident, as in areas of steep local relief,   |                   |
| only a single carrying contour is shown and is   |                   |
| coded for the value for the highest elevation    |                   |
| present. Valid contour line codes range from     |                   |
| -1,000 feet to 29,000 feet incrementing by 1,000 |                   |
| feet. Boundaries associated with no data areas   |                   |
| are assigned a value of 99999.\                  |                   |
| \                                                |                   |
| HYLNTUYPE Line Type.\                            |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Closed contour. 2. = Depression contour. 3. |                   |
| = Closed contour, approximate. 4. = Carrying     |                   |
| contour, coalescence of two or more contour      |                   |
| lines with different elevation values 5. =       |                   |
| Depression contour, approximate\                 |                   |
| \                                                |                   |
| 8. = Connector (an arbitrary connector of the    |                   |
| contour network, used to define no data or       |                   |
| irreconcible source data areas. These            |                   |
| connections were made to establish elevation     |                   |
| zones as polygons.) 9. = 5-degree by 5-degree    |                   |
| tile boundary.\                                  |                   |
| \                                                |                   |
| 88. = Used in situations during the edgematching |                   |
| process in which a polygon is contained on one   |                   |
| ONC mapping module due to compilation            |                   |
| differencies and the automation module boundary  |                   |
| is needed for closure.\                          |                   |
| \                                                |                   |
| Coverage name: HYPOINT Feature class type: Point |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| HYPTTYPE Hypsography point type\                 |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Spot elevation 2. = Spot elevation,         |                   |
| questionable or doubtful location 3. = Spot      |                   |
| elevation at the base of a tower 4. =            |                   |
| Hydrographic spot elevation\                     |                   |
| \                                                |                   |
| HYPTVAL Point value. This item contains the      |                   |
| elevation of the point, expressed in feet above  |                   |
| the mean sea level. The value \"99999\" is used  |                   |
| for spot locations without an assigned elevation |                   |
| value.\                                          |                   |
| \                                                |                   |
| Hypsography Supplemental layer\                  |                   |
| \                                                |                   |
| Coverage name: HSLINE Feature class type: Line   |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| HSLNTYPE Supplemental hypsography line type.     |                   |
| This item indicates the specific type of the     |                   |
| supplemental contour line. This coverage         |                   |
| contains unclosed contours and/or contours at    |                   |
| intervals other than 1,000 feet.\                |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Intermediate or auxiliary contour\* 2. =    |                   |
| Depression contour 3. = Approximate intermediate |                   |
| or approximate auxiliary contour\* 4. = Carrying |                   |
| contour, coalescence of two o more contour lines |                   |
| with different elevation values 5. = Cut within  |                   |
| one contour interval, and fill within one        |                   |
| contour interval 6. = Unreliable (present in     |                   |
| Antarctic tiles only) 7. = Transition or         |                   |
| erroneous contour 8. = Approximate depression    |                   |
| contour\                                         |                   |
| \                                                |                   |
| \* An intermediate contour is one that is        |                   |
| required between basic contours to portray form, |                   |
| degree of slope, and elevation not shown by the  |                   |
| basic contour interval. An auxiliary contour is  |                   |
| one that is used to portray configuration and    |                   |
| relative relief significance of additional land  |                   |
| forms not adequately portrayed by basic and/or   |                   |
| intermediate contours.\                          |                   |
| \                                                |                   |
| HSLNVAL Supplemental hypsography line value. The |                   |
| item HSLNVAL contains the elevation value of the |                   |
| contour line in feet above mean sea level (MSL). |                   |
| The code 99999 is used when an elevation value   |                   |
| is not applicable.\                              |                   |
| \                                                |                   |
| Land Cover Layer\                                |                   |
| \                                                |                   |
| Coverage name: LCPOLY Feature class type:        |                   |
| Polygon\                                         |                   |
| \                                                |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| LCPYTYPE Land cover polygon type.\               |                   |
| \                                                |                   |
| Agricultural/Extraction Features Code            |                   |
| Definition\                                      |                   |
| \                                                |                   |
| 1. = Rice field 2. = Cranberry bog 3. =          |                   |
| Cultivated area, garden 4. = Peat cuttings 5. =  |                   |
| Salt pan 6. = Fish pond/ hatchery 7. = Quarry,   |                   |
| strip mine, mine dump, and blasting area 8. =    |                   |
| Oil/Gas\                                         |                   |
| \                                                |                   |
| Surface Cover Features Code Definition\          |                   |
| \                                                |                   |
| 10. = Lava flow 11. = Distorted surface area 12. |                   |
| = Unconsolidated material 13. = Natural landmark |                   |
| area 14. = Inundated area 15. = Undifferentiated |                   |
| wetlands\                                        |                   |
| \                                                |                   |
| Coverage name: LCPOINT Feature class type:       |                   |
| Point\                                           |                   |
| \                                                |                   |
| LCPTTYPE Land cover point type\                  |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Mine 2. = Quarry, strip mine, mine dump,    |                   |
| and blasting area 3. = Miscellaneous land        |                   |
| feature (e.g., mountain name, cave, sink hole,   |                   |
| basalt pinnacle)\                                |                   |
| \                                                |                   |
| Ocean Features layer\                            |                   |
| \                                                |                   |
| Coverage name: OFLINE Feature class type: Line   |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| OFLNTYPE Ocean features line type\               |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Miscellaneous ocean feature 2. = Reef 3. =  |                   |
| Maritime area limit\                             |                   |
| \                                                |                   |
| Coverage name: OFPPOINT Feature class type:      |                   |
| Point Items, codes, and values\                  |                   |
| \                                                |                   |
| OFPTTYPE Ocean features point type\              |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Rocks, isolated or awash 2. = Exposed       |                   |
| wreck\                                           |                   |
| \                                                |                   |
| Physiography layer\                              |                   |
| \                                                |                   |
| Coverage name: PHLINE Feature class type: Line   |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| PHLNTYPE Physiography line type\                 |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Levee, dike, or esker 2. = Rock strata      |                   |
| outcrop 3. = Escarpment, bluff, cliff, etc. 4. = |                   |
| Earthquake fault 5. = Ice cliff on land 6. =     |                   |
| Crater\                                          |                   |
| \                                                |                   |
| Aeronautical layer\                              |                   |
| \                                                |                   |
| Coverage name: AEPOINT Feature class type: Point |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| AEPTTYPE Aeronautical point type. Airport        |                   |
| feature in Codes 1 through 4 were derived from   |                   |
| the DMA Digital Aeronautical Flight Information  |                   |
| File (DAFIF). Where this file was incomplete,    |                   |
| data were added from the ONCs (primarily in      |                   |
| Eastern Europe and the former Soviet Union).\    |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Active civil 2. = Active civil and military |                   |
| 3. = Active military 4. = Other 5. = Airport     |                   |
| location added from ONC source when not          |                   |
| available in the DAFIF\                          |                   |
| \                                                |                   |
| Cultural Landmark layer\                         |                   |
| \                                                |                   |
| Coverage name: CLPOLY Feature class type:        |                   |
| Polygon Items, codes, and values\                |                   |
| \                                                |                   |
| CLPYLABEL Cultural landmark polygon type. The    |                   |
| type of landmark is entered in this text field.  |                   |
| Representative values are fort, racetrack,       |                   |
| athletic field, area delimiting line (label),    |                   |
| and structure other than building (label)\       |                   |
| \                                                |                   |
| Coverage name: CLPOINT Feature class type: Point |                   |
| Items, codes and values\                         |                   |
| \                                                |                   |
| CLPTLABEL Cultural landmark point label. Labels  |                   |
| are entered for the symbols, if any, with        |                   |
| labels. About 150 representative values are      |                   |
| listed in the Digital Chart of the World Data    |                   |
| Dictionary. Examples are: ancient ruins,         |                   |
| cemetery, gas well, mountain pass, military      |                   |
| area, power plant, racecourse.\                  |                   |
| \                                                |                   |
| Coverage name: CLLINE Feature class type: Line   |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| CLLNLABEL Cultural landmark line label.          |                   |
| Representative values include Wier, jetty, and   |                   |
| groyne Boat ramp Pier, wharf, quay Breakwater    |                   |
| Aerial cableway Wall, trench, tank trap          |                   |
| Prominent fence Dams\*\                          |                   |
| \                                                |                   |
| \*The dams in this layer are those shown on the  |                   |
| ONC with their true shape and extent. Those dams |                   |
| that are represented only by a graphic symbol    |                   |
| are present as point data in the Drainage layer. |                   |
| All dams in the CLLINE coverage are also         |                   |
| represented as points in DNPOINT coverage. These |                   |
| features are not always coincident with inland   |                   |
| water shorelines (DNNET).\                       |                   |
| \                                                |                   |
| Transportation Structure layer\                  |                   |
| \                                                |                   |
| Coverage name: TSLINE Feature class type: Line   |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| TSLNTYPE Transportation structure line type.\    |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Road structure 2. = Railroad structure\     |                   |
| \                                                |                   |
| TSLNSTAT Line status.\                           |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Snowshed 2. = Bridge 3. = Causeway 4. =     |                   |
| Tunnel 5. = Ferry 6. = Ford\                     |                   |
| \                                                |                   |
| Coverage name: TSPOINT Feature class type: Point |                   |
| Items, codes, and values\                        |                   |
| \                                                |                   |
| TSPTTYPE Transportation point type.\             |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Road structure 2. = Railroad structure\     |                   |
| \                                                |                   |
| Point status.\                                   |                   |
| \                                                |                   |
| Code Definition\                                 |                   |
| \                                                |                   |
| 1. = Snowshed 2. = Bridge 3. = Causeway 4. =     |                   |
| Tunnel 5. = Ferry 6. = Ford 7. = Railroad yard   |                   |
| 8. = Railroad station\                           |                   |
| \                                                |                   |
| Vegetation layer\                                |                   |
| \                                                |                   |
| Coverage name: VGPOLY Feature class type:        |                   |
| Polygon Items, codes, and values\                |                   |
| \                                                |                   |
| VGPYTYPE Vegetation polygon type. This layer     |                   |
| contains land coverage information for the       |                   |
| coterminous United States only. The vegetation   |                   |
| information from the ONC source materials was    |                   |
| omitted from the database because it was so      |                   |
| restricted to air crews\' requirements as to be  |                   |
| of little general use. A classified Advanced     |                   |
| Very High Resolution Radiometer (AVHRR) image    |                   |
| was vectorized to provide a sample set of        |                   |
| vegetation data. The attribute codes used here   |                   |
| correspond with the USGS?s Level II codes in the |                   |
| Land Use and Land Cover Classification System    |                   |
| for Use with Remote Sensor Data (Anderson,       |                   |
| Hardy, Roach, and Witmer, USGS Professional      |                   |
| Paper 964, 1976).\                               |                   |
| \                                                |                   |
| (excerpted from the Digital Chart of the World   |                   |
| Data Dictionary)                                 |                   |
| \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\  |                   |
| -\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\ |                   |
| -\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-- |                   |
+--------------------------------------------------+-------------------+
| ![](media/image4.gif){width="4.875in"            |                   |
| height="0.625in"}\                               |                   |
| \                                                |                   |
| Copyright™ 1995-2001 GeoComm International       |                   |
| Corporation\                                     |                   |
| ***All Rights Reserved***\                       |                   |
| \                                                |                   |
| GeoCommunity™, GIS Data Depot®, and Spatial      |                   |
| News™\                                           |                   |
| including all logos and other service marks\     |                   |
| are registered trademarks and trade communities  |                   |
| of\                                              |                   |
| [*GeoComm International                          |                   |
| C                                                |                   |
| orporation.*](http://www.geocomm.com/corporate/) |                   |
+--------------------------------------------------+-------------------+