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These Digital Terrain Model (DTM), Digital Surface Model and their respective Hillshade data wereproduced all or in part from LiDAR information as of 2014. The LiDAR derived DTM covers Dupage County, Illinois and include inland streams, rivers, lakes ponds and tidal features. These data are appropriate for use in local and regional analysis. This dataset was contracted as 4 ppsm LiDAR point cloud data<\/SPAN><\/P>

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><\/SPAN><\/P><\/DIV><\/DIV><\/DIV>", "Subject": "These acquisitions of the LiDAR data and its derivatives were made possible by Dupage County. 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.\n\nThe 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.", "Category": "", "AntialiasingMode": "None", "TextAntialiasingMode": "Force", "Version": "10.1", "Keywords": "Elevation data,LiDAR,LAS,Bare Earth,DEM,Breakline" }, "supportsQueryDomains": true, "capabilities": "Map,Query,Data", "supportedQueryFormats": "JSON, geoJSON, PBF", "exportTilesAllowed": false, "referenceScale": 0.0, "supportsDatumTransformation": true, "heightModelInfo": { "heightModel": "gravity_related_height", "vertCRS": "NAVD_1988_Foot_US", "heightUnit": "us-foot" }, "supportsVCSProjection": true, "archivingInfo": {"supportsHistoricMoment": false}, "supportsClipping": true, "supportsSpatialFilter": true, "supportsTimeRelation": true, "supportsQueryDataElements": true, "maxRecordCount": 1000, "maxImageHeight": 4096, "maxImageWidth": 4096, "supportedExtensions": "KmlServer", "resampling": false }