| snippet:
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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 these lidar data was to produce high accuracy 3D hydro-flattened Digital Elevation Model (DEM) with a 2-foot cell size. The purpose of these lidar data was to produce high accuracy 3D hydro-flattened Digital Elevation Model (DEM) with a 2-foot cell size. |
| summary:
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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 these lidar data was to produce high accuracy 3D hydro-flattened Digital Elevation Model (DEM) with a 2-foot cell size. The purpose of these lidar data was to produce high accuracy 3D hydro-flattened Digital Elevation Model (DEM) with a 2-foot cell size. |
| accessInformation:
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USGS, NRCS, Quantum Spatial |
| thumbnail:
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| typeKeywords:
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["Data","Service","Image Service","ArcGIS Server"] |
| description:
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Geographic Extent: Pike and Scott Counties in western Illinois, covering approximately 1,100 total square miles. Dataset Description: The Pike and Scott Counties 2015 LiDAR project called for the planning, acquisition, processing and derivative products of LIDAR data to be collected at an aggregate 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 1.2. The data was developed based on a horizontal projection/datum of NAD83 (2011), State Plane Coordinate System Illinois West Zone, US survey feet and vertical datum of NAVD1988 (Geoid 12B), US survey feet. LiDAR data was delivered in RAW flight line swath format, processed to create Classified LAS 1.4 Files formatted to 7,998 individual 2,000-foot x 2,000-foot tiles. Corresponding 2-foot intensity image and 2-foot bare earth DEM tiles were created with the same 2,000-foot x 2,000-foot tile schema. Tiles names follow the US National Grid naming schema. Continuous breaklines were produced in Esri shapefile format. A mosaic of the 2-foot bare earth raster DEM tiles was also produced in Esri grid format. Ground Conditions: LiDAR was collected in winter of 2015 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, Quantum Spatial established 42 calibration control points in order to calibrate the LIDAR to known ground locations established throughout the project area. The accuracy of the data was checked with 58 NVA points and 47 VVA points (105 total QC checkpoints).</SPAN></P></DIV></DIV></DIV> |
| licenseInfo:
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<DIV STYLE="text-align:Left;"><DIV><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></DIV> |
| catalogPath:
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| title:
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IL_Scott_DSM_2015 |
| type:
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Image Service |
| url:
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https://isgs-datagis1:6443/arcgis |
| tags:
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["Light Detection and Ranging","LiDAR","Bare Earth","Point Cloud","Digital Elevation Model","DEM","Elevation","Surface Model","Digital Surface Model","DSM","Hillshade"] |
| culture:
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en-US |
| name:
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IL_Scott_DSM_2015 |
| guid:
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| spatialReference:
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GRS_1980_Transverse_Mercator |