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Elevation/IL_Franklin_DTM_2020 (ImageServer)

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Service Description: Product: These lidar data are processed Classified LAS 1.4 files, formatted to 18,609 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 1 HicksDome_FloursparDistrict Illinois, covering approximately 2616 square miles. Dataset Description: Block 1 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 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 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 18,609 individual 2000 US survey feet x 2000 US survey feet tiles, as was tiled Intensity Imagery, and 18,609 tiled bare earth DEMs; all tiled to the same 2000 US survey feet x 2000 US survey feet schema. DEMs were created with a 2 foot cell size and for that reason one DEM could not be produced for Tile 7430_4150 due to the tile containing less that 2 feet of data within the AOI. Please note*: When product was delivered it was discovered that the advanced classification (vegetation: low, medium, high) was not implemented thru out the whole dataset. Users will find that in majority of areas, vegetation is not classified. The vendor is aware of this and did not re-classify so the data is as is. 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 39 ground control points that were used to calibrate the lidar to known ground locations established throughout the Block 1 HicksDome_FloursparDistrict, Illinois project area. An additional 98 independent accuracy checkpoints, 57 in Bare Earth and Uraban landcovers (57 NVA points), 41 in tall Grass/tall weeds/crops, Brush lands/short trees, Forested categories (41 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_Franklin_DTM_2020

Description: Product: These lidar data are processed Classified LAS 1.4 files, formatted to 18,609 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 1 HicksDome_FloursparDistrict Illinois, covering approximately 2616 square miles. Dataset Description: Block 1 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 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 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 18,609 individual 2000 US survey feet x 2000 US survey feet tiles, as was tiled Intensity Imagery, and 18,609 tiled bare earth DEMs; all tiled to the same 2000 US survey feet x 2000 US survey feet schema. DEMs were created with a 2 foot cell size and for that reason one DEM could not be produced for Tile 7430_4150 due to the tile containing less that 2 feet of data within the AOI. Please note*: When product was delivered it was discovered that the advanced classification (vegetation: low, medium, high) was not implemented thru out the whole dataset. Users will find that in majority of areas, vegetation is not classified. The vendor is aware of this and did not re-classify so the data is as is. 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 39 ground control points that were used to calibrate the lidar to known ground locations established throughout the Block 1 HicksDome_FloursparDistrict, Illinois project area. An additional 98 independent accuracy checkpoints, 57 in Bare Earth and Uraban landcovers (57 NVA points), 41 in tall Grass/tall weeds/crops, Brush lands/short trees, Forested categories (41 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.

Single Fused Map Cache: false

Extent: Initial Extent: Full Extent: Pixel Size X: 1.5

Pixel Size Y: 1.5

Band Count: 1

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Mensuration Capabilities: Basic

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Copyright Text:

Service Data Type: esriImageServiceDataTypeGeneric

Min Values: 356.1611328125

Max Values: 607.3670043945312

Mean Values: 434.3784090452294

Standard Deviation Values: 37.6414253597082

Object ID Field:

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Child Resources:   Info   Histograms   Key Properties   Legend   MultiDimensionalInfo   rasterFunctionInfos

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