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

2017 Digital Terrain Model - NE Corner

Metadata Updated: March 3, 2023

Download In State Plane Projection Here

The 2017 Digital Terrain Model (DTM) is a 2 foot pixel resolution raster in Erdas IMG format. This was created using the ground (class = 2) lidar points and incorporating the breaklines.

The DTMs were developed using LiDAR data. LiDAR is an acronym for LIght Detection And Ranging. Light detection and ranging is the science of using a laser to measure distances to specific points. A specially equipped airplane with positioning tools and LiDAR technology was used to measure the distance to the surface of the earth to determine ground elevation. The classified points were developed using data collected in April to May 2017. The LiDAR points, specialized software, and technology provide the ability to create a high precision three-dimensional digital elevation and/or terrain models (DEM/DTM). The use of LiDAR significantly reduces the cost for developing this information.

The DTMs are intended to correspond to the orthometric heights of the bare surface of the county (no buildings or vegetation cover). DTM data is used by county agencies to study drainage issues such as flooding and erosion; contour generation; slope and aspect; and hill shade images. This dataset was compiled to meet the American Society for Photogrammetry and Remote Sensing (ASPRS) Accuracy Standards for Large-Scale Maps, CLASS 1 map accuracy.

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.

This dataset does not take the place of an on-site survey for design, construction or regulatory purposes.

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 Data.gov. License: See this page for license information.

Downloads & Resources

Dates

Metadata Created Date September 1, 2022
Metadata Updated Date March 3, 2023

Metadata Source

Harvested from Open data from Lake County, Illinois

Additional Metadata

Resource Type Dataset
Metadata Created Date September 1, 2022
Metadata Updated Date March 3, 2023
Publisher Lake County Illinois GIS
Maintainer
Identifier https://www.arcgis.com/home/item.html?id=2396cbb16b9b41369fc09a868b72f05d
Data First Published 2020-06-17T19:44:11.000Z
Data Last Modified 2023-03-01T18:09:45.000Z
Category geospatial
Public Access Level public
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id 0b8c03d3-0625-4e19-bf62-c72bfe5c1652
Harvest Source Id e2c1b013-5957-4c37-9452-7d0aafee3fcc
Harvest Source Title Open data from Lake County, Illinois
Homepage URL https://data-lakecountyil.opendata.arcgis.com/documents/lakecountyil::2017-digital-terrain-model-ne-corner
License https://www.arcgis.com/sharing/rest/content/items/89679671cfa64832ac2399a0ef52e414/data
Metadata Type geospatial
Old Spatial -88.2150,42.1580,-87.7810,42.4930
Source Datajson Identifier True
Source Hash 3513330156be4823d9b56663167833fc93631539
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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