US Migrating
type: Agent

2007 DTM - Township 45N Range 12E
type: Dataset
contact point: Organization
  fn: LakeCounty_Illinois
keyword: laser
keyword: light-detection-and-ranging
keyword: lidar
keyword: point-cloud
keyword: 3d
keyword: las
keyword: amerigeo
keyword: digital-terrain-model
keyword: dtm
keyword: national
keyword: ckan
keyword: digital-surface-model
keyword: bare-earth
keyword: elevation
keyword: lake-county-illinois
keyword: north-america
keyword: surface-model
keyword: amerigeoss
keyword: geoss
keyword: united-states
keyword: tin
keyword: triangulated-irregular-network
keyword: breaklines
keyword: topography
keyword: geo
keyword: hydro-flattened
theme: {geospatial}
description: This dataset has been deprecated. Please use our 2017 Digital Elevation Models instead. The Digital Terrain Model (DTM) is a 3.28 foot pixel resolution raster in GeoTIFF format upsampled to 2.5 feet to preserve detail. 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 2007. 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 me…
issued: 2018-02-07T15:37:42+00:00
modified: 2022-03-23T20:15:52+00:00
spatial: Location

ArcGIS GeoService
type: Distribution
access URL: https://s3.amazonaws.com/lakecountygis-public/topography/dtm4512.zip
media type: application/json
description: dtm4512.zip
format: ArcGIS GeoServices REST API
issued: 2022-04-20T22:51:58.798681
modified: 2025-11-21T23:45:55.271010

ArcGIS Hub Dataset
type: Distribution
access URL: https://data-lakecountyil.opendata.arcgis.com/documents/lakecountyil::2007-dtm-township-45n-range-12e
media type: text/html
format: HTML
issued: 2022-04-20T22:51:58.798672
modified: 2025-11-21T23:45:55.270579