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Elevation/IL_Edwards_DTM_2020 (ImageServer)

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Service Description: Product: These lidar data are processed Classified LAS 1.4 files, formatted to 17,201 individual 2000 US survey feet x 2000 US survey feet tiles; used to create intensity images, 3D breaklines and hydro-flattened DEMs as necessary. Geographic Extent: Block 2 East HicksDome_FloursparDistrict Illinois, covering approximately 2399 square miles. Dataset Description: Block 2 East HicksDome_FloursparDistrict Illinois 2019 Lidar 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. 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 Illinois East, 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 17,232 individual 2000 US survey feet x 2000 US survey feet tiles, 17,201 LAS files,as was tiled Intensity Imagery, and 17,232 tiled bare earth DEMs; all tiled to the same 2000 US survey feet x 2000 US survey feet schema. Lidar point cloud LAS files are created for each tile in the tiling schema in which there is reflected photonic energy. No LAS files are created for tiles in which there is total absorption of photons, such as tiles consisting of all water and in which photonic energy is absorbed. LAS files affected by photonic energy absorption are; 1011_2830, 1021_2870, 1037_3590, 1037_3610, 1041_2910, 1043_2910, 1045_2910, 1063_3110, 8090_2030, 8130_1990, 8150_1990, 8230_1970, 8310_1930, 8410_1870, 8430_1870, 8450_1870, 8470_1830, 8470_1850, 8470_1870, 8490_1830, 8510_1830, 8790_1670, 8790_1690, 8810_1670, 8850_1670, 8910_1630, 8950_1630, 9270_1430, 9530_1590, 9530_1890, 9530_1930, 9550_1850. Intensity Images are created for each tile in the tiling schema in which there is reflected photonic energy. No intensity tiles are created for tiles in which there is total absorption of photons, such as tiles consisting of all water and in which photonic energy is absorbed. Ground Conditions: Lidar was collected in early 2020, while no snow was on the ground and rivers were at or below normal levels. 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 35 ground control points that were used to calibrate the lidar to known ground locations established throughout the Block 2 East HicksDome_FloursparDistrict, Illinois project area. An additional 92 independent accuracy checkpoints, 53 in Bare Earth and Uraban landcovers (53 NVA points), 39 in tall Grass/tall weeds/crops, Brush lands/short trees, Forested categories (39 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data. **ISGS QAQC Review Comments: The delivery was contracted to include vegetation above ground points to be classified, these points are very sparse through out the collections. All points that are buildings are mis-classified as vegetation instead of unclassed as they should be. This error was pointed out to the vendor and the vendor ASI did not correct them. The LiDAR data for Edwards County was collected over a 2-day period, but there is a 4’ elevation change in one spot in the breaklines for the Little Wabash River. In a way it creates a wall, since the higher elevations are on the downstream side. Overall, the Little Wabash River doesn’t present a downhill surface. The data is as is.

Name: Elevation/IL_Edwards_DTM_2020

Description: Product: These lidar data are processed Classified LAS 1.4 files, formatted to 17,201 individual 2000 US survey feet x 2000 US survey feet tiles; used to create intensity images, 3D breaklines and hydro-flattened DEMs as necessary. Geographic Extent: Block 2 East HicksDome_FloursparDistrict Illinois, covering approximately 2399 square miles. Dataset Description: Block 2 East HicksDome_FloursparDistrict Illinois 2019 Lidar 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. 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 Illinois East, 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 17,232 individual 2000 US survey feet x 2000 US survey feet tiles, 17,201 LAS files,as was tiled Intensity Imagery, and 17,232 tiled bare earth DEMs; all tiled to the same 2000 US survey feet x 2000 US survey feet schema. Lidar point cloud LAS files are created for each tile in the tiling schema in which there is reflected photonic energy. No LAS files are created for tiles in which there is total absorption of photons, such as tiles consisting of all water and in which photonic energy is absorbed. LAS files affected by photonic energy absorption are; 1011_2830, 1021_2870, 1037_3590, 1037_3610, 1041_2910, 1043_2910, 1045_2910, 1063_3110, 8090_2030, 8130_1990, 8150_1990, 8230_1970, 8310_1930, 8410_1870, 8430_1870, 8450_1870, 8470_1830, 8470_1850, 8470_1870, 8490_1830, 8510_1830, 8790_1670, 8790_1690, 8810_1670, 8850_1670, 8910_1630, 8950_1630, 9270_1430, 9530_1590, 9530_1890, 9530_1930, 9550_1850. Intensity Images are created for each tile in the tiling schema in which there is reflected photonic energy. No intensity tiles are created for tiles in which there is total absorption of photons, such as tiles consisting of all water and in which photonic energy is absorbed. Ground Conditions: Lidar was collected in early 2020, while no snow was on the ground and rivers were at or below normal levels. 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 35 ground control points that were used to calibrate the lidar to known ground locations established throughout the Block 2 East HicksDome_FloursparDistrict, Illinois project area. An additional 92 independent accuracy checkpoints, 53 in Bare Earth and Uraban landcovers (53 NVA points), 39 in tall Grass/tall weeds/crops, Brush lands/short trees, Forested categories (39 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data. **ISGS QAQC Review Comments: The delivery was contracted to include vegetation above ground points to be classified, these points are very sparse through out the collections. All points that are buildings are mis-classified as vegetation instead of unclassed as they should be. This error was pointed out to the vendor and the vendor ASI did not correct them. The LiDAR data for Edwards County was collected over a 2-day period, but there is a 4’ elevation change in one spot in the breaklines for the Little Wabash River. In a way it creates a wall, since the higher elevations are on the downstream side. Overall, the Little Wabash River doesn’t present a downhill surface. The data is as is.

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