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LiDAR data and its derivatives assist in real-world uses around the state of Illinois such as; highway engineering, flood prediction, agricultural land management, mining subsidence, monitoring archaeological features, locating sinkholes and applied geologic science.
The data do not replace the need for detailed site-specific studies. The information is not appropriate for, and is not to be used as, a geodetic, legal, or engineering base. The information has no legal basis in the definition of boundaries or property lines and is not intended as a substitute for surveyed locations such as can be determined by a registered Public Land Surveyor. This acquisition and processing of LiDAR data for Boone County commenced in the Spring of 2018. Boone County is approximately 303 square miles. Services include LiDAR acquisition; ground control survey; LiDAR post-processing; LiDAR classification; hydro-flattening; QA/QC, and; development of derivative deliverable products (including metadata and reporting). |
| summary:
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LiDAR data and its derivatives assist in real-world uses around the state of Illinois such as; highway engineering, flood prediction, agricultural land management, mining subsidence, monitoring archaeological features, locating sinkholes and applied geologic science.
The data do not replace the need for detailed site-specific studies. The information is not appropriate for, and is not to be used as, a geodetic, legal, or engineering base. The information has no legal basis in the definition of boundaries or property lines and is not intended as a substitute for surveyed locations such as can be determined by a registered Public Land Surveyor. This acquisition and processing of LiDAR data for Boone County commenced in the Spring of 2018. Boone County is approximately 303 square miles. Services include LiDAR acquisition; ground control survey; LiDAR post-processing; LiDAR classification; hydro-flattening; QA/QC, and; development of derivative deliverable products (including metadata and reporting). |
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Illinois State Geological Survey, University of Illinois and Merrick and Company. |
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["Data","Service","Image Service","ArcGIS Server"] |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This Digital Terrain Model (DTM) data was produced all or in part from LiDAR information as of 2018. The LiDAR derived DTM covers Boone County, Illinois and include inland streams, rivers, lakes ponds and tidal features. These data are appropriate for use in local and regional analysis. </SPAN><SPAN>This data set has a vertical accuracy of 4.57 centimeters RMSEz and point spacing of 0.42 meters. Digital Elevation Models (including terrain and surface models) are raster data sets created from whole LiDAR point cloud data sets (LAS files). The LAS files are the standard LiDAR file format which contains the raw point cloud data, these data are normally classified and distinguished between points on the ground, water or elevated features such as buildings, trees, towers, bridges, etc.. These LAS files are processed into elevation models to create gridded rasters. The first returns can be used to map the top reflective surface (Digital Surface Models - DSM), these normally include open terrain areas, as well as the tops of buildings, trees, towers, and other features elevated above the bare earth. The last returns are used to map the bare-earth terrain (Digital Terrain Models - DTM), these are normally produced with irregularly-spaced points rather than the uniform grid structure of a Digital Elevation Model (DEM), Digital Terrain Models will often include breaklines to help define edges of water bodies.</SPAN></P><P><SPAN>There are 11 classifications Unclassified, Ground, Low Veg, Medium Veg, High Veg, Buildings, Low Noise, Water, Ignore Ground, Bridge Decks and High Noise. Model key points are bit-flagged and created from ground (class = 2) points using a two foot horizontal and a 0.2 foot vertical variance. The files are delivered in section formatted tiles. These files adhere to the National Enhanced Elevation Assessment (NEEA) Quality Level 2 (QL2) standards. The contractual aggregate nominal pulse spacing (ANPS) is less than or equal to 0.5m. The contractual aggregate nominal point density (ANPD) is 4.0 points or greater per square meter.</SPAN></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV STYLE="font-size:12pt"><P><SPAN>unknown</SPAN></P></DIV></DIV></DIV> |
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| title:
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IL_Boone_DTM_2018 |
| 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_Boone_DTM_2018 |
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| spatialReference:
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NAD_1983_2011_StatePlane_Illinois_East_FIPS_1201_Ft_US |