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Elevation/IL_Moultrie_DSM_2021 (ImageServer)

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Service Description: Product: These lidar data are processed Classified LAS 1.4 files, formatted to 41,490 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: Original Illinois LiDAR project was named; USGS_IL_SouthCentral_1_2021 Illinois 2021 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 2020 rev A. 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 (GEOID18), US survey feet. Lidar data was delivered as processed Classified LAS 1.4 files, formatted to 41,502 individual 2000 US survey feet x 2000 US survey feet tiles, 41,490 tiled Intensity Imagery, and 41,502 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; 7170_7550, 7170_7570, 7170_7590, 7190_7550, 7190_7590, 7210_7550, 7210_7610, 7210_7630, 7230_7550, 7230_7590, 7250_7550, 7250_7570. 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 spring 2021, 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, Prairie Engineers established a total of 72 ground control points that were used to calibrate the lidar to known ground locations established throughout the USGS_IL_SouthCentral_1_2021, Illinois project area. An additional 294 independent accuracy checkpoints, 169 in Bare Earth and Urban landcovers (169 NVA points), 125 in tall Grass/tall weeds/crops, Brush lands/short trees, Forested categories (125 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.

Name: Elevation/IL_Moultrie_DSM_2021

Description: Product: These lidar data are processed Classified LAS 1.4 files, formatted to 41,490 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: Original Illinois LiDAR project was named; USGS_IL_SouthCentral_1_2021 Illinois 2021 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 2020 rev A. 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 (GEOID18), US survey feet. Lidar data was delivered as processed Classified LAS 1.4 files, formatted to 41,502 individual 2000 US survey feet x 2000 US survey feet tiles, 41,490 tiled Intensity Imagery, and 41,502 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; 7170_7550, 7170_7570, 7170_7590, 7190_7550, 7190_7590, 7210_7550, 7210_7610, 7210_7630, 7230_7550, 7230_7590, 7250_7550, 7250_7570. 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 spring 2021, 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, Prairie Engineers established a total of 72 ground control points that were used to calibrate the lidar to known ground locations established throughout the USGS_IL_SouthCentral_1_2021, Illinois project area. An additional 294 independent accuracy checkpoints, 169 in Bare Earth and Urban landcovers (169 NVA points), 125 in tall Grass/tall weeds/crops, Brush lands/short trees, Forested categories (125 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.

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Supported Operations:   Export Image   Identify   Measure   Compute Histograms   Compute Statistics Histograms   Get Samples   Compute Class Statistics