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To acquire QL2+ lidar detailing surface elevation data, and vegetation for use in conservation planning design, research, floodplain mapping, dam safety assessment and elevation modeling, ect. Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create Intensity Images, Breaklines and Raster DEMs. The purpose of this lidar data was to produce high accuracy 3D hydro-flattened Digital Elevation Model (DEM) with a 2 US survey feet cell size. These lidar point cloud data were used to create intensity images, 3D breaklines, and hydro-flattened DEMs as necessary. |
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To acquire QL2+ lidar detailing surface elevation data, and vegetation for use in conservation planning design, research, floodplain mapping, dam safety assessment and elevation modeling, ect. Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create Intensity Images, Breaklines and Raster DEMs. The purpose of this lidar data was to produce high accuracy 3D hydro-flattened Digital Elevation Model (DEM) with a 2 US survey feet cell size. These lidar point cloud data were used to create intensity images, 3D breaklines, and hydro-flattened DEMs as necessary. |
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Recommended Publishing Citation: Illinois Height Modernization Program, Illinois State Geological Survey, United States Geological Survey, and Natural Resources Conservation Service, 2002–2022, Illinois LiDAR county database: Illinois State Geological Survey, https://clearinghouse.isgs.illinois.edu/data/elevation/illinois-height-modernization-ilhmp/ (accessed April ,2022) |
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| typeKeywords:
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["Data","Service","Image Service","ArcGIS Server"] |
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<DIV STYLE="text-align:Left;"><DIV><P><SPAN>Product: These lidar data are part of a 8 county project in the NorthWest of Illinois. This data are processed Classified LAS 1.4 files, formatted to 14482 individual 1000 meter x 1000 meter tiles; used to create intensity images, 3D breaklines and hydro-flattened DEMs as necessary. Geographic Extent: Jo Daviess, Stephenson, Carroll, Ogle, Whiteside, Lee, Rock Island, and Henry Counties Illinois, covering approximately 5318 square miles. Dataset Description: Illinois 8 county 2019 Lidar Dataset Description: Block 3_IL_8 County, Illinois 2019 Lidar project called for the planning, acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing of 0.5 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.3. The data was developed based on a horizontal projection/datum of NAD83(2011), State Plane Coordinat System Illinois East (FIPS 1201), United States Survey Feet, and a vertical datum of NAVD88 (GEOID12B), US survey feet. Lidar data was delivered as processed Classified LAS 1.4 files, formatted to 37,739 individual 2000 US survey feet x 2000 US survey feet tiles, and 37,738 tiled Intensity Imagery, and 37,739 tiled bare earth DEMs; all tiled to the same 2000 US survey feet x 2000 US survey feet schema. project called for the planning, acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.5 meters. Tile 2075_1735 is located within a water body with no reflectance measured within the tile boundary, so no intensity image was produced for that tile. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.3; Quality Level 2+. The data was developed based on a horizontal projection/datum of NAD83(2011), State Plane Coordinat System Illinois East (FIPS 1201), US survey feet, and a vertical datum of NAVD88 (GEOID12B), US survey feet. Lidar data was delivered as processed Classified LAS 1.4 files, formatted to 37,739 individual 2000 US survey feet x 2000 US survey feet tiles, as tiled Intensity Imagery, and as tiled bare earth DEMs; all tiled to the same 2000 x 2000 US survey feet schema -- ISGS QAQC comments: Almost all of the buildings have been classified as vegetation. These points should be classified as class 1 but was not corrected. There are Erroneous High and Low points found in a North - South swath over the Whiteside and Carroll counties and an East - West strip in Jo Daviess county. There are flight lines that are out of tolerance. -- Ground Conditions: Lidar was collected in late 2019, early 2020 and late 2020 while no snow was on the ground, and rivers levels fluctuated. In order to post process the lidar data to meet task order specifications and meet ASPRS vertical accuracy guidelines, Subcontractor, Surveying and Mapping, LLC (SAM) established a total of 76 ground control points that were used to calibrate the lidar to known ground locations established throughout the Block 3_IL_8 County project area. An additional 219 independent accuracy checkpoints, 127 in Bare Earth and Uraban landcovers (127 NVA points), 92 in tall Grass/tall weeds/crops, Brush lands/short trees, Forested categories (92 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.</SPAN></P></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><P><SPAN>None. However, users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of its limitations. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data.</SPAN></P></DIV></DIV> |
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| title:
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IL_Whiteside_DSM_2020 |
| type:
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Image Service |
| url:
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https://isgs-datagis1.ad.uillinois.edu:6443/arcgis/admin/ |
| tags:
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["Carroll County","Illinois","LAS Point Cloud","Elevation Data","Henry County","Lidar","Model","Lee County","Rock Island County","Whiteside County","Stephenson County","Ogle County","Remote Sensing","Jo Daviess Country"] |
| culture:
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en-US |
| name:
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IL_Whiteside_DSM_2020 |
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| spatialReference:
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NAD_1983_2011_StatePlane_Illinois_West_FIPS_1202_Ft_US |