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This is a Non-Federal dataset covered by different Terms of Use than

2007 Contours - Township 43N Range 9E (dwg)

Metadata Updated: September 1, 2022

This dataset has been deprecated. Please use our 2017 Countywide Contours instead.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.

The U.S. Army Corps of Engineers Engineering and Design Manual for Photogrammetric Production 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.

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.

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.

Access & Use Information

Public: This dataset is intended for public access and use. Non-Federal: This dataset is covered by different Terms of Use than License: See this page for license information.

Downloads & Resources


Metadata Created Date September 1, 2022
Metadata Updated Date September 1, 2022

Metadata Source

Harvested from Open data from Lake County, Illinois

Additional Metadata

Resource Type Dataset
Metadata Created Date September 1, 2022
Metadata Updated Date September 1, 2022
Publisher Lake County Illinois GIS
Data First Published 2018-02-07T15:12:53.000Z
Data Last Modified 2022-03-23T20:09:41.000Z
Category geospatial
Public Access Level public
Metadata Context
Schema Version
Catalog Describedby
Harvest Object Id 0d9fb8de-a0aa-458a-a1f8-6996fa73a219
Harvest Source Id e2c1b013-5957-4c37-9452-7d0aafee3fcc
Harvest Source Title Open data from Lake County, Illinois
Homepage URL
Metadata Type geospatial
Old Spatial -88.2150,42.1580,-87.7810,42.4930
Source Datajson Identifier True
Source Hash 4ec65229c40b0f538c053ed1599c866763423b7c
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -88.2150, 42.1580, -88.2150, 42.4930, -87.7810, 42.4930, -87.7810, 42.1580, -88.2150, 42.1580}

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