The DEM of Cook County was developed from the DEM tiles that were delivered after the 2022 LiDAR acquisition. This DEM assembles all the tiles into one raster. It displays the bare earth returns of the LiDAR as a raster. <\/div>
<\/div>
There were no data values recorded in the Lidar for a small area of the Calumet Shores Gull Island wetland. The lidar is intended to return surface elevation for waterbodies; however in this instance there is a reflectance error. A corrected value for the surface elevation of 579.26 was calculated using a constant value raster. The original 3 tiffs are available (18508225.tif,18508250.tif, 18758250.tif).<\/div>",
"extent": {
"xmin": 995000,
"ymin": 1740000,
"xmax": 1212500,
"ymax": 2007500,
"spatialReference": {
"wkt2": "COMPOUNDCRS[\"\",PROJCRS[\"NAD_1983_2011_StatePlane_Illinois_East_FIPS_1201_Ft_US\",BASEGEOGCRS[\"GCS_NAD_1983_2011\",DYNAMIC[FRAMEEPOCH[2010.0],MODEL[\"HTDP\"]],DATUM[\"D_NAD_1983_2011\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101,LENGTHUNIT[\"Meter\",1.0]]],PRIMEM[\"Greenwich\",0.0,ANGLEUNIT[\"Degree\",0.0174532925199433]],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],CONVERSION[\"Transverse_Mercator\",METHOD[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",984250.0,LENGTHUNIT[\"Foot_US\",0.3048006096012192]],PARAMETER[\"False_Northing\",0.0,LENGTHUNIT[\"Foot_US\",0.3048006096012192]],PARAMETER[\"Central_Meridian\",-88.33333333333333,ANGLEUNIT[\"Degree\",0.0174532925199433]],PARAMETER[\"Scale_Factor\",0.999975,SCALEUNIT[\"Unity\",1.0]],PARAMETER[\"Latitude_Of_Origin\",36.66666666666666,ANGLEUNIT[\"Degree\",0.0174532925199433]]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Foot_US\",0.3048006096012192]],VERTCRS[\"NAVD_1988\",VDATUM[\"North_American_Vertical_Datum_1988\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Foot_US\",0.3048006096012192]]]]",
"wkt": "PROJCS[\"NAD_1983_2011_StatePlane_Illinois_East_FIPS_1201_Ft_US\",GEOGCS[\"GCS_NAD_1983_2011\",DATUM[\"D_NAD_1983_2011\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",984250.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",-88.33333333333333],PARAMETER[\"Scale_Factor\",0.999975],PARAMETER[\"Latitude_Of_Origin\",36.66666666666666],UNIT[\"Foot_US\",0.3048006096012192]],VERTCS[\"NAVD_1988\",VDATUM[\"North_American_Vertical_Datum_1988\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Foot_US\",0.3048006096012192]]"
}
},
"initialExtent": {
"xmin": 995000,
"ymin": 1740000,
"xmax": 1212500,
"ymax": 2007500,
"spatialReference": {
"wkt2": "COMPOUNDCRS[\"\",PROJCRS[\"NAD_1983_2011_StatePlane_Illinois_East_FIPS_1201_Ft_US\",BASEGEOGCRS[\"GCS_NAD_1983_2011\",DYNAMIC[FRAMEEPOCH[2010.0],MODEL[\"HTDP\"]],DATUM[\"D_NAD_1983_2011\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101,LENGTHUNIT[\"Meter\",1.0]]],PRIMEM[\"Greenwich\",0.0,ANGLEUNIT[\"Degree\",0.0174532925199433]],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],CONVERSION[\"Transverse_Mercator\",METHOD[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",984250.0,LENGTHUNIT[\"Foot_US\",0.3048006096012192]],PARAMETER[\"False_Northing\",0.0,LENGTHUNIT[\"Foot_US\",0.3048006096012192]],PARAMETER[\"Central_Meridian\",-88.33333333333333,ANGLEUNIT[\"Degree\",0.0174532925199433]],PARAMETER[\"Scale_Factor\",0.999975,SCALEUNIT[\"Unity\",1.0]],PARAMETER[\"Latitude_Of_Origin\",36.66666666666666,ANGLEUNIT[\"Degree\",0.0174532925199433]]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Foot_US\",0.3048006096012192]],VERTCRS[\"NAVD_1988\",VDATUM[\"North_American_Vertical_Datum_1988\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Foot_US\",0.3048006096012192]]]]",
"wkt": "PROJCS[\"NAD_1983_2011_StatePlane_Illinois_East_FIPS_1201_Ft_US\",GEOGCS[\"GCS_NAD_1983_2011\",DATUM[\"D_NAD_1983_2011\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",984250.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",-88.33333333333333],PARAMETER[\"Scale_Factor\",0.999975],PARAMETER[\"Latitude_Of_Origin\",36.66666666666666],UNIT[\"Foot_US\",0.3048006096012192]],VERTCS[\"NAVD_1988\",VDATUM[\"North_American_Vertical_Datum_1988\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Foot_US\",0.3048006096012192]]"
}
},
"fullExtent": {
"xmin": 995000,
"ymin": 1740000,
"xmax": 1212500,
"ymax": 2007500,
"spatialReference": {
"wkt2": "COMPOUNDCRS[\"\",PROJCRS[\"NAD_1983_2011_StatePlane_Illinois_East_FIPS_1201_Ft_US\",BASEGEOGCRS[\"GCS_NAD_1983_2011\",DYNAMIC[FRAMEEPOCH[2010.0],MODEL[\"HTDP\"]],DATUM[\"D_NAD_1983_2011\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101,LENGTHUNIT[\"Meter\",1.0]]],PRIMEM[\"Greenwich\",0.0,ANGLEUNIT[\"Degree\",0.0174532925199433]],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],CONVERSION[\"Transverse_Mercator\",METHOD[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",984250.0,LENGTHUNIT[\"Foot_US\",0.3048006096012192]],PARAMETER[\"False_Northing\",0.0,LENGTHUNIT[\"Foot_US\",0.3048006096012192]],PARAMETER[\"Central_Meridian\",-88.33333333333333,ANGLEUNIT[\"Degree\",0.0174532925199433]],PARAMETER[\"Scale_Factor\",0.999975,SCALEUNIT[\"Unity\",1.0]],PARAMETER[\"Latitude_Of_Origin\",36.66666666666666,ANGLEUNIT[\"Degree\",0.0174532925199433]]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Foot_US\",0.3048006096012192]],VERTCRS[\"NAVD_1988\",VDATUM[\"North_American_Vertical_Datum_1988\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Foot_US\",0.3048006096012192]]]]",
"wkt": "PROJCS[\"NAD_1983_2011_StatePlane_Illinois_East_FIPS_1201_Ft_US\",GEOGCS[\"GCS_NAD_1983_2011\",DATUM[\"D_NAD_1983_2011\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",984250.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",-88.33333333333333],PARAMETER[\"Scale_Factor\",0.999975],PARAMETER[\"Latitude_Of_Origin\",36.66666666666666],UNIT[\"Foot_US\",0.3048006096012192]],VERTCS[\"NAVD_1988\",VDATUM[\"North_American_Vertical_Datum_1988\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Foot_US\",0.3048006096012192]]"
}
},
"sortableFields": "MinPS,MaxPS,LowPS,HighPS,CenterX,CenterY,ZOrder,Shape_Length,Shape_Area",
"heightModelInfo": {
"heightModel": "gravity_related_height",
"vertCRS": "NAVD_1988",
"heightUnit": "us-foot"
},
"bandCount": 1,
"pixelType": "F32",
"minValues": [
218.77699279785156
],
"maxValues": [
949.1519775390625
],
"meanValues": [
669.5246651462563
],
"stdvValues": [
75.27037265608415
],
"hasMultidimensions": false,
"pixelSizeX": 1,
"pixelSizeY": 1,
"meanPixelSize": 0.30480060960121924,
"datasetFormat": "AMD",
"uncompressedSize": 232725000000,
"blockWidth": 2048,
"blockHeight": 256,
"compressionType": "None",
"bandNames": [
"Band_1"
],
"allowCopy": true,
"allowAnalysis": true,
"itemAccess": false,
"inspectionCapabilities": "",
"minPixelSize": 0,
"maxPixelSize": 0,
"copyrightText": "Cook County GIS Department",
"serviceDataType": "esriImageServiceDataTypeGeneric",
"serviceSourceType": "esriImageServiceSourceTypeMosaicDataset",
"objectIdField": "OBJECTID",
"fields": [
{
"name": "OBJECTID",
"type": "esriFieldTypeOID",
"alias": "OBJECTID",
"domain": null
},
{
"name": "Shape",
"type": "esriFieldTypeGeometry",
"alias": "Shape",
"domain": null
},
{
"name": "Name",
"type": "esriFieldTypeString",
"alias": "Name",
"domain": null,
"length": 200
},
{
"name": "MinPS",
"type": "esriFieldTypeDouble",
"alias": "MinPS",
"domain": null
},
{
"name": "MaxPS",
"type": "esriFieldTypeDouble",
"alias": "MaxPS",
"domain": null
},
{
"name": "LowPS",
"type": "esriFieldTypeDouble",
"alias": "LowPS",
"domain": null
},
{
"name": "HighPS",
"type": "esriFieldTypeDouble",
"alias": "HighPS",
"domain": null
},
{
"name": "Category",
"type": "esriFieldTypeInteger",
"alias": "Category",
"domain": {
"type": "codedValue",
"name": "MosaicCatalogItemCategoryDomain",
"description": "Catalog item categories.",
"codedValues": [
{
"name": "Unknown",
"code": 0
},
{
"name": "Primary",
"code": 1
},
{
"name": "Overview",
"code": 2
},
{
"name": "Unprocessed Overview",
"code": 3
},
{
"name": "Partial Overview",
"code": 4
},
{
"name": "Inactive",
"code": 5
},
{
"name": "Uploaded",
"code": 253
},
{
"name": "Incomplete",
"code": 254
},
{
"name": "Custom",
"code": 255
}
],
"mergePolicy": "esriMPTDefaultValue",
"splitPolicy": "esriSPTDefaultValue"
}
},
{
"name": "Tag",
"type": "esriFieldTypeString",
"alias": "Tag",
"domain": null,
"length": 100
},
{
"name": "GroupName",
"type": "esriFieldTypeString",
"alias": "GroupName",
"domain": null,
"length": 100
},
{
"name": "ProductName",
"type": "esriFieldTypeString",
"alias": "ProductName",
"domain": null,
"length": 100
},
{
"name": "CenterX",
"type": "esriFieldTypeDouble",
"alias": "CenterX",
"domain": null
},
{
"name": "CenterY",
"type": "esriFieldTypeDouble",
"alias": "CenterY",
"domain": null
},
{
"name": "ZOrder",
"type": "esriFieldTypeInteger",
"alias": "ZOrder",
"domain": null
},
{
"name": "Shape_Length",
"type": "esriFieldTypeDouble",
"alias": "Shape_Length",
"domain": null
},
{
"name": "Shape_Area",
"type": "esriFieldTypeDouble",
"alias": "Shape_Area",
"domain": null
}
],
"capabilities": "Catalog,Mensuration,Pixels,Download,Image,Metadata",
"defaultMosaicMethod": "Northwest",
"allowedMosaicMethods": "NorthWest,Center,LockRaster,ByAttribute,Nadir,Viewpoint,Seamline,None",
"sortField": "",
"sortValue": null,
"sortAscending": true,
"mosaicOperator": "First",
"maxDownloadSizeLimit": 5000,
"defaultCompressionQuality": 75,
"defaultResamplingMethod": "Bilinear",
"maxImageHeight": 267500,
"maxImageWidth": 217500,
"maxRecordCount": 1000,
"maxDownloadImageCount": 400,
"maxMosaicImageCount": 40,
"allowRasterFunction": true,
"rasterFunctionInfos": [
{
"name": "None",
"description": "Make a Raster or Raster Dataset into a Function Raster Dataset.",
"help": ""
},
{
"name": "None",
"description": "Make a Raster or Raster Dataset into a Function Raster Dataset.",
"help": ""
}
],
"rasterTypeInfos": [
{
"name": "Raster Dataset",
"description": "Supports all ArcGIS Raster Datasets",
"help": ""
}
],
"mensurationCapabilities": "Basic",
"hasHistograms": true,
"hasColormap": false,
"hasRasterAttributeTable": false,
"minScale": 0,
"maxScale": 0,
"exportTilesAllowed": false,
"supportsStatistics": true,
"supportsAdvancedQueries": true,
"editFieldsInfo": null,
"ownershipBasedAccessControlForRasters": null,
"allowComputeTiePoints": false,
"useStandardizedQueries": true,
"advancedQueryCapabilities": {
"useStandardizedQueries": true,
"supportsStatistics": true,
"supportsOrderBy": true,
"supportsDistinct": true,
"supportsPagination": true
},
"spatialReference": {
"wkt2": "COMPOUNDCRS[\"\",PROJCRS[\"NAD_1983_2011_StatePlane_Illinois_East_FIPS_1201_Ft_US\",BASEGEOGCRS[\"GCS_NAD_1983_2011\",DYNAMIC[FRAMEEPOCH[2010.0],MODEL[\"HTDP\"]],DATUM[\"D_NAD_1983_2011\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101,LENGTHUNIT[\"Meter\",1.0]]],PRIMEM[\"Greenwich\",0.0,ANGLEUNIT[\"Degree\",0.0174532925199433]],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],CONVERSION[\"Transverse_Mercator\",METHOD[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",984250.0,LENGTHUNIT[\"Foot_US\",0.3048006096012192]],PARAMETER[\"False_Northing\",0.0,LENGTHUNIT[\"Foot_US\",0.3048006096012192]],PARAMETER[\"Central_Meridian\",-88.33333333333333,ANGLEUNIT[\"Degree\",0.0174532925199433]],PARAMETER[\"Scale_Factor\",0.999975,SCALEUNIT[\"Unity\",1.0]],PARAMETER[\"Latitude_Of_Origin\",36.66666666666666,ANGLEUNIT[\"Degree\",0.0174532925199433]]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Foot_US\",0.3048006096012192]],VERTCRS[\"NAVD_1988\",VDATUM[\"North_American_Vertical_Datum_1988\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Foot_US\",0.3048006096012192]]]]",
"wkt": "PROJCS[\"NAD_1983_2011_StatePlane_Illinois_East_FIPS_1201_Ft_US\",GEOGCS[\"GCS_NAD_1983_2011\",DATUM[\"D_NAD_1983_2011\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",984250.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",-88.33333333333333],PARAMETER[\"Scale_Factor\",0.999975],PARAMETER[\"Latitude_Of_Origin\",36.66666666666666],UNIT[\"Foot_US\",0.3048006096012192]],VERTCS[\"NAVD_1988\",VDATUM[\"North_American_Vertical_Datum_1988\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Foot_US\",0.3048006096012192]]"
},
"resampling": false
}