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Elevation/IL_Randolph_DTM_2020 (ImageServer)

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Service Description: Product: These lidar data are processed Classified LAS 1.4 files, formatted to 19,255 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: USGS_IL_HicksDome_FluorsparDist_3_2019, Illinois covering approximately 2685 square miles. Dataset Description: USGS_IL_HicksDome_FluorsparDist_3_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 West, 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 19,255 individual 2000 US survey feet x 2000 US survey feet tiles, 19,250 LAS files,as was tiled Intensity Imagery, and 19,255 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; 2483_2210, 2655_2050, 2657_2050, 2643_2030, 2295_5090. 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 and late fall 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 61 ground control points that were used to calibrate the lidar to known ground locations established throughout the USGS_IL_HicksDome_FluorsparDist_3_2019, Illinois project area. An additional 171 independent accuracy checkpoints, 97 in Bare Earth and Uraban landcovers (97 NVA points), 74 in tall Grass/tall weeds/crops, Brush lands/short trees, Forested categories (74 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 data review comments: Users should be aware that above ground points may not be complete in certain areas. This was discovered after the contract was closed and no resolution was provided by the vendor ASI. An automated filtration process was used to classify points above ground, some or most of the buildings were left in the vegetation class and should be classified as unclassified as the buildings classification was not paid for by the funding partners (was ASI response).

Name: Elevation/IL_Randolph_DTM_2020

Description: Product: These lidar data are processed Classified LAS 1.4 files, formatted to 19,255 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: USGS_IL_HicksDome_FluorsparDist_3_2019, Illinois covering approximately 2685 square miles. Dataset Description: USGS_IL_HicksDome_FluorsparDist_3_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 West, 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 19,255 individual 2000 US survey feet x 2000 US survey feet tiles, 19,250 LAS files,as was tiled Intensity Imagery, and 19,255 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; 2483_2210, 2655_2050, 2657_2050, 2643_2030, 2295_5090. 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 and late fall 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 61 ground control points that were used to calibrate the lidar to known ground locations established throughout the USGS_IL_HicksDome_FluorsparDist_3_2019, Illinois project area. An additional 171 independent accuracy checkpoints, 97 in Bare Earth and Uraban landcovers (97 NVA points), 74 in tall Grass/tall weeds/crops, Brush lands/short trees, Forested categories (74 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 data review comments: Users should be aware that above ground points may not be complete in certain areas. This was discovered after the contract was closed and no resolution was provided by the vendor ASI. An automated filtration process was used to classify points above ground, some or most of the buildings were left in the vegetation class and should be classified as unclassified as the buildings classification was not paid for by the funding partners (was ASI response).

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