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This data set was created to serve as part of a standard database for virtually all geospatial applications in Cook County, and is intended to support general location, planning, and cartography projects, as well as general inventory and asset management, Census analysis and mapping, and geocoding by address. The orthophotos were created as a control and foundation for planimetric and cadastral data sets and to provide a visual baseline for Cook County. |
| summary:
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This data set was created to serve as part of a standard database for virtually all geospatial applications in Cook County, and is intended to support general location, planning, and cartography projects, as well as general inventory and asset management, Census analysis and mapping, and geocoding by address. The orthophotos were created as a control and foundation for planimetric and cadastral data sets and to provide a visual baseline for Cook County. |
| accessInformation:
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Cook County Board of Commissioners, Merrick & Company |
| thumbnail:
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| maxScale:
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18025.2820354398 |
| 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>This digital geospatial file consists of a series of raster digital orthophoto images covering all of Cook, DuPage, Grundy, Kane, Kendall, Lake, McHenry, and Will County, Illinois.</SPAN></P><P><SPAN>The images have a pixel resolution of 0.5 feet which generated an orthophotographic database with a mapping scale of 1" = 100'. The imagery for the "Countywide Flight" was collected between April 2, 2015 and May 7, 2015.</SPAN></P><P><SPAN>The imagery for the "Special Consideration Area" was collected between April 3, 2015 and June 14, 2015. (Refer to the relevant Process Step for a description of the principal differences between these two flights.)</SPAN></P><P><SPAN>A digital orthoimage is a raster image of remotely sensed data that has had displacement in the image introduced by sensor orientation and terrain relief removed. Digital orthoimages combine the image characteristics of photography with the geometric qualities of maps. The normal orientation of this data is by lines (rows) and samples (columns). Each sample in this data set contains a series of pixels ordered from west to east with the order of the lines from north to south.</SPAN></P><P><SPAN>The data set is tiled for dissemination into 18,905 separate tiles, each of which is 2500 feet on a side.</SPAN></P><P><SPAN>This digital geospatial file has been orthorectified using survey control points obtained through both Airborne Global Positioning Systems and Ground Control Survey. This dataset is projected using the Transverse Mercator map projection. The grid coordinate system used is the Illinois State Plane Coordinate System, East Zone (Zone Number Zone 3776, FIPS 1201), NAD 83 (NSRS2007) (horizontal datum), with ground coordinates expressed in U.S. Survey Feet.</SPAN></P><P><SPAN>Each tile consists of two files, a TIFF (Tagged Image File Format) (.tif), and an ASCII geo-referencing header file (.tfw). Each tile is approximately 100MB in size resulting in a total of 1.9TB for the region.</SPAN></P></DIV></DIV></DIV> |
| licenseInfo:
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Access to this feature dataset is available to county and municipal agencies. Editing privileges are restricted to authorized GIS staff members or its designees.</SPAN></P></DIV></DIV></DIV> |
| catalogPath:
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| title:
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cogis_DBO_Ortho2015IR_6IN |
| type:
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Image Service |
| url:
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https://gis.willcountyillinois.com/image |
| tags:
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["digital ortho-photograph","digital ortho","orthorectified image","digital image","digital ortho-photo","rectified photograph","rectified image","orthophoto","digital ortho-imagery","ortho-image","Color orthoimagery","Color orthophotographs","4-band","four-band","Imagery","base maps","and land cover","Illinois","northeastern Illinois","Chicago","Cook County","DuPage County","Kane County","Kendall County","Lake County","McHenry County","Will County","Grundy County","mosaic dataset"] |
| culture:
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en-US |
| name:
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cogis_DBO_Ortho2015IR_6IN |
| guid:
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|
| minScale:
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3.69157776085807E7 |
| spatialReference:
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NAD_1983_NSRS2007_StatePlane_Illinois_East_FIPS_1201_Ft_US |