NASA/TMm2000-209891, Vol. 108

Technical Report Series on the

Boreal Ecosystem-Atmosphere Study (BOREAS)

Forrest G. Hall, Editor

Volume 108

BOREAS Regional DEM in Raster

Format and AEAC Projection

David Knapp, Raytheon ITSS, NASA Goddard Space Flight Center,

Greenbelt, Maryland

Kristine Verdin, USGS/EROS Data Center,

Sioux Falls, South Dakota

National Aeronautics and

Space Administration

Goddard Space Flight Center

Greenbelt, Maryland 20771

September 2000

https://ntrs.nasa.gov/search.jsp?R=20010022232 2018-05-14T18:50:01+00:00Z
The NASA STI Program Office ... in Profile

Since its founding, NASA has been dedicated to

the advancement of aeronautics and space

science. The NASA Scientific and Technical

Information (STI) Program Office plays a key

part in helping NASA maintain this important

role.

The NASA STI Program Office is operated by

Langley Research Center, the lead center for

NASA's scientific and technical information. The

NASA STI Program Office provides access to

the NASA STI Database, the largest collection of

aeronautical and space science STI in the world.

The Program Office is also NASA's institutional

mechanism for disseminating the results of its

research and development activities. These

results are published by NASA in the NASA STI

Report Series, which includes the following

report types:

• TECHNICAL PUBLICATION. Reports of

completed research or a major significant

phase of research that present the results of

NASA programs and include extensive data or

theoretical analysis. Includes compilations of

significant scientific and technical data and

information deemed to be of continuing

reference value. NASA's counterpart of

peer-reviewed formal professional papers but

has less stringent limitations on manuscript

length and extent of graphic presentations.

• TECHNICAL MEMORANDUM. Scientific

and technical findings that are preliminary or

of specialized interest, e.g., quick release

reports, working papers, and bibliographies

that contain minimal annotation. Does not

contain extensive analysis.

• CONTRACTOR REPORT. Scientific and

technical findings by NASA-sponsored

contractors and grantees.

CONFERENCE PUBLICATION. Collected

papers from scientific and technical

conferences, symposia, seminars, or other

meetings sponsored or cosponsored by NASA.

SPECIAL PUBLICATION. Scientific, technical, or historical information from NASA

programs, projects, and mission, often concerned with subjects having substantial public

interest.

TECHNICAL TRANSLATION.

English-language translations of foreign scientific and technical material pertinent to NASA's

mission.

Specialized services that complement the STI

Program Office's diverse offerings include creating custom thesauri, building customized databases, organizing and publishing research results...

even providing videos.

For more information about the NASA STI Prograin Office, see the following:

Access the NASA STI Program Home Page at

http://www, sti.nasa.gov/STI-homepage.html

E-mail your question via the Internet to

help@ sti.nasa.gov

Fax your question to the NASA Access Help

Desk at (301) 621-0134

• Telephone the NASA Access Help Desk at

(301) 621-0390

Write to:

NASA Access Help Desk

NASA Center for AeroSpace Information

7121 Standard Drive

Hanover, MD 21076-1320
NASA/TMm2000-209891, Vol. 108

Technical Report Series on the

Boreal Ecosystem-Atmosphere Study (BOREAS)

Forrest G. Hall, Editor

Volume 108

BOREAS Regional DEM in Raster

Format and AEAC Projection

David Knapp, Raytheon ITSS, NASA Goddard Space Flight Center,

Greenbelt, Maryland

Kristine Verdin, USGS/EROS Data Center,

Sioux Falls, South Dakota

National Aeronautics and

Space Administration

Goddard Space Flight Center

Greenbelt, Maryland 20771

September 2000
NASA Center for AeroSpace Information

7121 Standard Drive

Hanover, MD 21076-1320

Price Code: A17

Available from:

National Technical Information Service

5285 Port Royal Road

Springfield, VA 22161

Price Code: A10
BOREAS Regional DEM in Raster Format and AEAC Projection

David Knapp, Kristine Verdin

Summary

This data set is based on the GTOPO30 DEM produced by the USGS EDC. The BOREAS region

(1,000 km x 1000 kin) was extracted from the GTOPO30 data and reprojected by BOREAS staff into

the AEAC projection. The pixel size of these data is 1 kin. The data are stored in binary, image format

files.

Note that the binary files of this data set on the BOREAS CD-ROMs have been compressed using

the Gzip program. See Section 8.2 for details.

Table of Contents

1) Data Set Overview

2) Investigator(s)

3) Theory of Measurements

4) Equipment

5) Data Acquisition Methods

6) Observations

7) Data Description

8) Data Organization

9) Data Manipulations

10) Errors

11) Notes

12) Application of the Data Set

13) Future Modifications and Plans

14) Software

15) Data Access

16) Output Products and Availability

17) References

18) Glossary of Terms

19) List of Acronyms

20) Document Information

1. Data Set Overview

1.1 Data Set Identification

BOREAS Regional DEM in Raster Format and AEAC Projection

1.2 Data Set Introduction

This data set is based on the GTOPO30 global Digital Elevation Model (DEM) produced by

theUnited States Geological Survey (USGS) Earth Resources Observation System (EROS) Data

Center (EDC). The area covering the BOReal Ecosystem-Atmosphere Study (BOREAS) region (1,000

km x 1,000 kin) was extracted from the GTOPO30 data and reprojected by BOREAS Information

System (BORIS) staff into the BOREAS grid projection. The pixel size of these data is 1 kin. The

GTOPO30 data set produced by EDC is in latitude/longitude and has a pixel size of 30 arcseconds. The

GTOPO30 data set is available from the EDC Distributed Active Archive Center (DAAC).

Page 1
1.3 Objective/Purpose

These data are provided as part of the BOREAS Staff Science Geographic Information System

(GIS) Data Collection Program, which included the collection of pertinent map data in both hardcopy

and digital form. The purpose of this data set is to provide users with a data product that characterizes

the topography of the BOREAS region. This data set is to be used for modeling purposes at a regional

scale.

1.4 Summary of Parameters

Elevation above mean sea level.

1.5 Discussion

None.

1.6 Related Data Sets

BOREAS HYD-08 DEM Data over the NSA-MSA and SSA-MSA in the UTM Projection

BOREAS DEM Data over the NSA-MSA and SSA-MSA in the AEAC Projection

GTOPO30 Global 30 Arc Second Elevation Data Set:

(available at http://edcwww.cr.usgs.gov/landdaac/gtopO30/gtopO30.html)

(tiles W100N90 and W140N90 of GTOPO30 cover the BOREAS region)

2. Investigator(s)

2.1 Investigator(s) Name and Title

BOREAS Staff Science

2.2 Title of Investigation

BOREAS Staff Science GIS Activities

2.3 Contact Information

Contact 1:

Kristine Verdin

USGS/EROS Data Center

Sioux Falls, SD 57198

(605) 594-6002

kverdin@ dg 1 .cr.usgs.gov

Contact 2:

David E. Knapp

Raytheon ITSS

NASA GSFC

Code 923

Greenbelt, MD 20771

(301) 286-1424

(301) 286-0239 (fax)

David.Knapp@ gsfc.nasa.gov

Page 2
3. Theory of Measurements

This data product was reprojected from a DEM product by EDC. It is intended to represent the terrain

at a regional scale.

4. Equipment

4.1 Sensor/Instrument Description

Users of this data set are referred to the EDC DAAC to obtain background information on how

these data were compiled.

4.1.1 Collection Environment

Unknown.

4.1.2 Source/Platform

Unknown.

4.1.3 Source/Platform Mission Objectives

Unknown.

4.1.4 Key Variables

Elevation above mean sea level

4.1.5 Principles of Operation

Unknown.

4.1.6 Sensor/Instrument Measurement Geometry

Unknown.

4.1.7 Manufacturer of Sensor/Instrument

Unknown.

4.2 Calibration

Unknown.

4.2.1 Specifications

Unknown.

4.2.1.1 Tolerance

Unknown.

4.2.2 Frequency of Calibration

Unknown.

4.2.3 Other Calibration Information

Unknown.

Page 3
5. Data Acquisition Methods

The original data were acquired from personnel at the USGS EDC. EDC personnel used Digital

Terrain Elevation Data (DTED) from Canada and resampled them to 30 arcseconds using a nearest

neighbor resampling method. Any areas that were not covered by DTED were filled in with gridded

contour data from the Digital Chart of the World (DCW). These data were gridded by EDC using the

TOPOG software package. The stream network from the DCW was used for drainage enforcement.

The data covering the BOREAS region were extracted from the EDC DEM by BORIS staff and

reprojected into the BOREAS grid projection.

6.1 Data Notes

Unknown.

6.2 Field Notes

Unknown.

6. Observations

7. Data Description

7.1 Spatial Characteristics

7.1.1 Spatial Coverage

The area covered by this DEM is a 1,000-kin x 1,000-kin area that roughly straddles the

Manitoba-Saskatchewan border in Canada. The North American Datum of 1983 (NAD83) corner

coordinates of the BOREAS region are:

BOREAS

Corner Latitude Longitude X (km) Y (km)

Northwest 58.979 N

Northeast 58.844 N

Southwest 51.000 N

Southeast 50.089 N

7.1.2 Spatial Coverage Map

Not available.

7.1.3 Spatial Resolution

iii.000 W 0.000 i000.000

93.502 W i000.000 i000.000

iii.000 W 0.000 0.000

96.969 W i000.000 0.000

These dma were gridded to a cell size of 1,000 meters in both the X and Y _rections.

7.1.4 Projection

The area mapped is pr_ected in the BOREAS grid pr_ection, which is based on the ellipsoidN

version of the ANers Equal-Area Conic (AEAC) pr_ection. The pr_ection has the following

parameters:

Datum: NAD83

Ellipsoid: GRS80 or WGS84

Origin: III.000°W 51.000°N

Standard Parallels: 52 ° 30' 00"N

58 ° 30' 00"N

Units of Measure: kilometers

Page 4
7.1.5 Grid Description

Not available.

7.2 Temporal Characteristics

7.2.1 Temporal Coverage

Not applicable

7.2.2 Temporal Coverage Map

Not available.

7.2.3 Temporal Resolution

The sources of data produced by EDC were from different dates. The temporal characteristics of

these data are insignificant, considering the fact that these are elevation data at a very coarse scale (a

pixel is 1,000 m x 1,000 m).

7.3 Data Characteristics

7.3.1 Parameter/Variable

Elevation above mean sea level

7.3.2 Variable Description/Definition

Elevation above mean sea level - The vertical distance between a plane at mean sea level and a

parallel plane intersecting the given geographic point.

7.3.3 Unit of Measurement

Meters

7.3.4 Data Source

The original data were acquired from personnel at the USGS EDC.

7.3.5 Data Range

Not available.

7.4 Sample Data Record

Not applicable to binary raster images.

8. Data Organization

8.1 Data Granularity

The smallest amount of data that can be ordered from this data set is the entire data set covering the

entire BOREAS region.

8.2 Data Format(s)

The Compact Disk-Read-Only Memory (CD-ROM) files contain American Standard Code for

Information Interchange (ASCII) numerical and character fields of varying length separated by

commas. The character fields are enclosed with single apostrophe marks. There are no spaces between

the fields.

Each data file on the CD-ROM has four header lines of Hyper-Text Markup Language (HTML)

code at the top. When viewed with a Web browser, this code displays header information (data set

title, location, date, acknowledgments, etc.) and a series of HTML links to associated data files and

related data sets. Line 5 of each data file is a list of the column names, and line 6 and following lines

contain the actual data.

Page 5
8.2.1 Uncompressed Data Files

The data product contains two files:

• File 1: ASCII header file containing 8 records of 80 bytes.

• File 2: DEM data file consisting of 1,000 records containing 2,000 bytes each. Each

2,000-byte record is an image line and contains 1,000 2-byte (16-bit) integers stored as

low-order byte first.

8.2.2 Compressed CD-ROM Files

On the BOREAS CD-ROMs, file 1 is stored as ASCII text; however, file 2 has been compressed

with the Gzip compression program (file name *.gz). These data have been compressed using gzip

version 1.2.4 and the high compression (-9) option (Copyright (C) 1992-1993 Jean-loup Gailly). Gzip

(GNU zip) uses the Lempel-Ziv algorithm (Welch, 1994) used in the zip and PKZIP programs. The

compressed files may be uncompressed using gzip (-d option) or gunzip. Gzip is available from many

Web sites (for example, ftp site prep.ai.mit.edu/pub/gnu/gzip-*.*) for a variety of operating systems in

both executable and source code form. Versions of the decompression software for various systems

are included on the CD-ROMs.

9. Data Manipulations

9.1 Formulae

9.1.1 Derivation Techniques and Algorithms

As stated in Section 5, these data were reprojected from latitude/longitude coordinates to the

BOREAS grid projection. The BOREAS grid is based on the ellipsoidal version of the AEAC

projection as defined within NAD83. The parameters used for this projection are given in Section

7.1.4. A nearest neighbor resampling method was used in reprojecting the data.

9.2 Data Processing Sequence

9.2.1 Processing Steps

BORIS staff processed the data by:

• Extracting the DEM from EDC into ARC/INFO grid

• Creating a projection file to define input (latitude/longitude) and output (AEAC) projections

• Reprojecting the original DEM into the AEAC projection using the ARC/INFO PROJECT

command

• Writing the reprojected data file to tape

• Copying the ASCII and compressing the binary files for release on CD-ROM

9.2.2 Processing Changes

None.

9.3 Calculations

9.3.1 Special Corrections/Adjustments

None.

9.3.2 Calculated Variables

None.

9.4 Graphs and Plots

None.

Page 6
10. Errors

10.1 Sources of Error

The TOPOG program interpolates the values to grid cells from vector data (digitized contours).

Errors occur where the original vector data are too sparse spatially, e.g., in flat lowland areas.

10.2 Quality Assessment

No quality assessment is available; therefore, caution is advised to those who use this product.

10.2.1 Data Validation by Source

Not available.

10.2.2 Confidence Level/Accuracy Judgment

Not available.

10.2.3 Measurement Error for Parameters

Not available.

10.2.4 Additional Quality Assessments

Not available.

10.2.5 Data Verification by Data Center

After extracting and repro jeering the data, BORIS staff" displayed and visually reviewed the data.

No anomalies or errors were detected in this review.

11. Notes

11.1 Limitations of the Data

Elevational variations can exist within the lakes, especially large lakes, due to the reason given in

Section 10.1.

11.2 Known Problems with the Data

See Sections 10.1 and 11.1.

11.3 Usage Guidance

It is important to keep in mind that this data set is at a coarse scale and might not be useful at other

scales.

Before uncompressing the Gzip files on CD-ROM, be sure that you have enough disk space to hold

the uncompressed data files. Then use the appropriate decompression program provided on the

CD-ROM for your specific system.

11.4 Other Relevant Information

The original EDC GTOPO30 Global 30 Arc Second Elevation Data Set is available at

http://edcwww.cr.usgs.gov/landdaac/gtopO30/(map files W100N90 and W140N90 of GTOPO30

cover the BOREAS region).

12. Application of the Data Set

These data could be used by anyone needing elevation data at coarse resolutions over large areas.

Page 7
13. Future Modifications and Plans

None.

14. Software

14.1 Software Description

The data manipulation capabilities in the ARC/INFO software package (Version 7.0) were used to

reproject the data. ARC/INFO is a GIS package developed by the Environmental Systems Research

Institute, Inc. (ESRI).

Gzip (GNU zip) uses the Lempel-Ziv algorithm (Welch, 1994) used in the zip and PKZIP

commands.

14.2 Software Access

ARC/INFO is a proprietary software package produced by ESRI:

Environmental Systems Research Institute, Inc.

380 New York St.

Redlands, CA 92373-8100

Gzip is available from many Web sites across the Internet (for example, ftp site

prep.ai.mit.edu/pub/gnu/gzip-*.*) for a variety of operating systems in both executable and source

code form. Versions of the decompression software for various systems are included on the

CD-ROMs.

15. Data Access

The BOREAS regional DEM data in raster format and AEAC projection are available from the Earth

Observing System Data and Information System (EOSDIS) Oak Ridge National Laboratory (ORNL)

Distributed Active Archive Center (DAAC).

15.1 Contact Information

For BOREAS data and documentation please contact:

ORNL DAAC User Services

Oak Ridge National Laboratory

P.O. Box 2008 MS-6407

Oak Ridge, TN 37831-6407

Phone: (423) 241-3952

Fax: (423) 574-4665

E-mail: ornldaac@ornl.gov or ornl@eos.nasa.gov

15.2 Data Center Identification

Earth Observing System Data and Information System (EOSDIS) Oak Ridge National Laboratory

(ORNL) Distributed Active Archive Center (DAAC) for Biogeochemical Dynamics

http://www-eosdis.ornl.gov/.

15.3 Procedures for Obtaining Data

Users may obtain data directly through the ORNL DAAC online search and order system

[http://www-eosdis.ornl.gov/] and the anonymous FTP site [ftp://www-eosdis.ornl.gov/data/] or by

contacting User Services by electronic mail, telephone, fax, letter, or personal visit using the contact

information in Section 15.1.

Page 8
15.4 Data Center Status/Plans

The ORNL DAAC is the primary source for BOREAS field measurement, image, GIS, and

hardcopy data products. The BOREAS CD-ROM and data referenced or listed in inventories on the

CD-ROM are available from the ORNL DAAC.

16. Output Products and Availability

16.1 Tape Products

The DEM data can be made available on 8-ram, Digital Archive Tape (DAT), or 9-track tapes at

1600 or 6250 Bytes Per Inch (BPI).

16.2 Film Products

None.

16.3 Other Products

These data are available on the BOREAS CD-ROM series.

17. References

17.1 Platform/Sensor/Instrument/Data Processing Documentation

Snyder, J.P. 1987. Map Projections - A Working Manual. USGS Professional Paper 1395.

TOPOG User Guide (Version 5.0). 1994. Division of Water Resources, CSIRO. Canberra, Australia.

Welch, T.A. 1984. A Technique for High Performance Data Compression. IEEE Computer, Vol. 17,

No. 6, pp. 8-19.

17.2 Journal Articles and Study Reports

Newcomer, J., D. Landis, S. Conrad, S. Curd, K. Huemmrich, D. Knapp, A. Morrell, J. Nickeson,

A. Papagno, D. Rinker, R. Strub, T. Twine, F. Hall, and P. Sellers, eds. 2000. Collected Data of The

Boreal Ecosystem-Atmosphere Study. NASA. CD-ROM.

Sellers, P. and F. Hall. 1994. Boreal Ecosystem-Atmosphere Study: Experiment Plan. Version

1994-3.0, NASA BOREAS Report (EXPLAN 94).

Sellers, P. and F. Hall. 1996. Boreal Ecosystem-Atmosphere Study: Experiment Plan. Version

1996-2.0, NASA BOREAS Report (EXPLAN 96).

Sellers, P., F. Hall, and K.F. Huemmrich. 1996. Boreal Ecosystem-Atmosphere Study: 1994

Operations. NASA BOREAS Report (OPS DOC 94).

Sellers, P., F. Hall, and K.F. Huemmrich. 1997. Boreal Ecosystem-Atmosphere Study: 1996

Operations. NASA BOREAS Report (OPS DOC 96).

Sellers, P., F. Hall, H. Margolis, B. Kelly, D. Baldocchi, G. den Hartog, J. Cihlar, M.G. Ryan, B.

Goodison, P. Crill, K.J. Ranson, D. Lettenmaier, and D.E. Wickland. 1995. The boreal

ecosystem-atmosphere study (BOREAS): an overview and early results from the 1994 field year.

Bulletin of the American Meteorological Society. 76(9): 1549-1577.

Page 9
Sellers,P.J.,F.G.Hall, R.D.Kelly, A. Black, D. Baldocchi,J. Berry, M. Ryan,K.J. Ranson,P.M.

Crill, D.P.Lettenmaier,H. Margolis,J.Cihlar, J.Newcomer,D. Fitzjarrald,P.G.Jarvis,S.T.

Gower,D. Halliwell, D. Williams, B. Goodison,D.E.Wickland, andF.E.Guertin.1997.BOREAS

in 1997:ExperimentOverview,ScientificResultsandFutureDirections.Journalof Geophysical

Research102(D24):28,731-28,770.

17.3 Archive/DBMS Usage Documentation

None.

None.

18. Glossary of Terms

AEAC

ASCII

BOREAS

BORIS

BPI

CD-ROM

DAAC

DAT

DCW

DEM

DTED

EDC

EOS

EOSDIS

EROS

ESRI

GIS

GSFC

NAD27

NAD83

NASA

NSA

ORNL

PANP

SSA

URL

USGS

UTM

19. List of Acronyms

- Albers Equal-Area Conic

- American Standard Code for Information Interchange

- BOReal Ecosystem-Atmosphere Study

- BOREAS Information System

- Bytes Per Inch

- Compact Disk-Read-Only Memory

- Distributed Active Archive Center

- Digital Archive Tape

- Digital Chart of the World

- Digital Elevation Model

- Digital Terrain Elevation Data

- EROS Data Center

- Earth Observing System

- EOS Data and Information System

- Earth Resources Observation System

- Environmental Systems Research Institute, Inc.

- Geographic Information System

- Goddard Space Flight Center

- North American Datum of 1927

- North American Datum of 1983

- National Aeronautics and Space Administration

- Northern Study Area

- Oak Ridge National Laboratory

- Prince Albert National Park

- Southern Study Area

- Uniform Resource Locator

- United States Geological Survey

- Universal Transverse Mercator

Page 10
20. Document Information

20.1 Document Revision Dates

Written: 17-Mar- 1995

Last Updated: 05-Feb- 1999

20.2 Document Review Dates

BORIS Review: 05-Jun- 1997

Science Review:

20.3 Document ID

20.4 Citation

When using these data, please include the following acknowledgment as well as citations of

relevant papers in Section 17.2:

The efforts of the BORIS staff in making these data available are greatly appreciated.

If using data from the BOREAS CD-ROM series, also reference the data as:

David E. Knapp, "BOREAS Staff Science GIS Activities." In Collected Data of The Boreal

Ecosystem-Atmosphere Study. Eds. J. Newcomer, D. Landis, S. Conrad, S. Curd, K. Huemmrich,

D. Knapp, A. Morrell, J. Nickeson, A. Papagno, D. Rinker, R. Strub, T. Twine, F. Hall, and P.

Sellers. CD-ROM. NASA, 2000.

Also, cite the BOREAS CD-ROM set as:

Newcomer, J., D. Landis, S. Conrad, S. Curd, K. Huemmrich, D. Knapp, A. Morrell, J.

Nickeson, A. Papagno, D. Rinker, R. Strub, T. Twine, F. Hall, and P. Sellers, eds. Collected Data of

The Boreal Ecosystem-Atmosphere Study. CD-ROM. NASA, 2000.

20.5 Document Curator

20.6 Document URL

Page 11
REPORT DOCUMENTATION PAGE FormApproved

OMB No. 0704-0188

Public reporting burden for this collection of informationis estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources,

gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this

collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson

Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188), Washington, DC 20503.

1. AGENCY USE ONLY (Leave blank) 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED

September 2000 Technical Memorandum

4. TITLE AND SUBTITLE 5. FUNDING NUMBERS

Technical Report Series on the Boreal Ecosystem-Atmosphere Study (BOREAS)

BOREAS Regional DEM in Raster Format and AEAC Projection 923

6. AUTHOR(S) RTOP: 923-462-33-01

David Knapp and Kristine Verdin

Forrest G. Hall, Editor

7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS (ES)

Goddard Space Flight Center

Greenbelt, Maryland 20771

9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS (ES)

National Aeronautics and Space Administration

Washington, DC 20546-0001

8. PEFORMING ORGANIZATION

REPORT NUMBER

2000-03136-0

10. SPONSORING / MONITORING

AGENCY REPORT NUMBER

TM--2000-209891

Vol. 108

11. SUPPLEMENTARY NOTES

D. Knapp: Raytheon ITSS, NASA Goddard Space Flight Center, Greenbelt, Maryland;

K. Verdin: USGS/EROS Data Center, Sioux Falls, South Dakota

12a. DISTRIBUTION / AVAILABILITY STATEMENT

Unclassifie_Unlimited

Subject Category: 43

Report available from the NASA Center for AeroSpace Information,

7121 Standard Drive, Hanover, MD 21076-1320. (301) 621-0390.

12b. DISTRIBUTION CODE

13. ABSTRACT (Maximum 200 words)

This data set is based on the GTOPO30 DEM produced by the USGS EDC. The BOREAS region

(1,000 km x 1000 km) was extracted from the GTOPO30 data and reprojected by BOREAS staff into

the AEAC projection. The pixel size of these data is 1 km. The data are stored in binary, image format

files.

14. SUBJECT TERMS

BOREAS, remote sensing science.

17. SECURITY CLASSIFICATION

OF REPORT

Unclassified

NSN 7540-01-280-5500

18. SECURITY CLASSIFICATION

OF THIS PAGE

Unclassified

19. SECURITY CLASSIFICATION

OF ABSTRACT

Unclassified

15. NUMBER OF PAGES

11

16. PRICE CODE

20. LIMITATION OF ABSTRACT

UL

Standard Form 298 (Rev. 2-89)

Prescribed by ANSI Std. Z39.18

298-102