2007 Contours - Township 46N Range 9E (dgn)

<p><b><font size='4'>This dataset has been deprecated. Please use our <a href='https://data-lakecountyil.opendata.arcgis.com/datasets/2017-countywide-contours' rel='nofollow ugc' target='_blank'>2017 Countywide Contours</a> instead.</font></b></p><p style='margin-top:0in; margin-right:0in; margin-bottom:7.5pt; margin-left:0in; background:white;'><span style='font-size:13.5pt; font-family:&quot;Avenir Next&quot;,serif; color:#4C4C4C;'>These data comprise of one foot contours showing the elevation
of Lake County, IL corresponding to the orthometric heights of the bare surface
of the county (no buildings or vegetation cover). These data were developed
from LIDAR data obtained between April 16, 2007 and May 07, 2007, and further
supplemented by break lines collected from aerial photography taken at the same
time. The contours and the aerial photography meet National Map Accuracy
Standards for a 1 inch = 100 foot product. The contours have been created to be
cartographically pleasing, as such some generalization has been introduced as
expected. The contours have been tested against the original LIDAR points and
conforms to the American Society for Photogrammetry and Remote Sensing (ASPRS)
Specifications and Standards Committee, 1990, ASPRS Accuracy Standards for
Large-Scale Maps, CLASS 1 map accuracy. The vertical datum is the North
American Vertical Datum of 1988.</span></p>

<p style='margin-top:0in; margin-right:0in; margin-bottom:7.5pt; margin-left:0in; background:white; box-sizing:border-box; font-variant-ligatures:normal; font-variant-caps:normal; text-align:start; text-decoration-style:initial; text-decoration-color:initial; word-spacing:0px;'><span style='font-size:13.5pt; font-family:&quot;Avenir Next&quot;,serif; color:#4C4C4C;'>The
U.S. Army Corps of Engineers <a href='https://www.publications.usace.army.mil/Portals/76/Publications/EngineerManuals/EM_1110-1-1000.pdf' rel='nofollow ugc' style='box-sizing:border-box;'><span style='color:#136FBF;'>Engineering and
Design Manual for Photogrammetric Production</span></a> recommends that
data intended for this usage scale be used for any of the following purposes:
route location, preliminary alignment and design, preliminary project planning,
hydraulic sections, rough earthwork estimates, or high-gradient terrain / low
unit cost earthwork excavation estimates. The manual does not recommend that
these data be used for final design, excavation and grading plans, earthwork
computations for bid estimates or contract measurement and payment.</span></p>

<p style='margin-top:0in; margin-right:0in; margin-bottom:7.5pt; margin-left:0in; background:white; box-sizing:border-box; font-variant-ligatures:normal; font-variant-caps:normal; text-align:start; text-decoration-style:initial; text-decoration-color:initial; word-spacing:0px;'><span style='font-size:13.5pt; font-family:&quot;Avenir Next&quot;,serif; color:#4C4C4C;'>Contour
data is used by county agencies to study drainage issues such as flooding and
erosion. Customers interested in the actual LiDAR data may download it at no
cost from the USGS Center for LiDAR Information Coordination and Knowledge.</span></p>

<p style='margin-top:0in; margin-right:0in; margin-bottom:7.5pt; margin-left:0in; background:white; box-sizing:border-box; font-variant-ligatures:normal; font-variant-caps:normal; text-align:start; text-decoration-style:initial; text-decoration-color:initial; word-spacing:0px;'><span style='font-size:13.5pt; font-family:&quot;Avenir Next&quot;,serif; color:#4C4C4C;'>These
files are tiled by PLSS section and grouped by township and format for easier
download. Please note that this dataset is available in for GIS in Esri
shapefile format as well as for CAD in AutoCAD DWG and MicroStation DGN. We are
unable to provide any support for CAD users beyond providing the data.</span></p>

Tags: 3d, contours, elevation, lake-county-illinois, surface-model, terrain, tin, topography, triangulated-irregular-network
Organization: Lake County, Illinois