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FALSE
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GCS_NAD_1983_NSRS2007
Linear Unit: Foot_US (0.304801)
NAD_1983_NSRS2007_StatePlane_Illinois_East_FIPS_1201_Ft_US
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20210423
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20210423
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Esri ArcGIS 12.7.3.26828
Cook County 2013 Aerial Imagery (Contract No. 13-28-017), 1:1,200-Scale (1" = 100') Tiled 4-band (R, G, B, NIR) Digital Orthoimagery for Cook, DuPage, Grundy, Kane, Kendall, Lake, McHenry, and Will County, Illinois. Raster Digital Data, Version 1.0. Published April 2014.
ORTHOS2013_6IN
2014-04-01T00:00:00
1
-88.267019
-87.515370
41.739028
41.194159
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.
<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, 2013 and May 7, 2013.</SPAN></P><P><SPAN>The imagery for the "Special Consideration Area" was collected between April 3, 2013 and June 14, 2013. (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>
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
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN><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></SPAN></P></DIV></DIV></DIV>
Under no circumstances may the data be redistributed or made available over a network without explicit permission from the Cook County Bureau of Technology.
It is required that the Cook County Board of Commissioners be cited in any products generated from the data. The following source citation must be included: "Cook County 2013 Aerial Imagery (Contract No. 13-28-017), 1:1,200-Scale (1" = 100') Tiled 4-band (R, G, B, NIR) Digital Orthoimagery for Cook, DuPage, Grundy, Kane, Kendall, Lake, McHenry, and Will County, Illinois. Raster Digital Data, Version 1.0. Published April 2014."
Cook County Board of Commissioners, Merrick & Company
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
File Geodatabase Raster Dataset
ArcGIS 10.1
Service Pack 2
dataset
EPSG
8.9.3(10.0.0)
Pixel
395000
410000
0.500000
0.500000
8
1
Upper Left
FALSE
LZ77
4
pixel codes
FGDBR
TRUE
row and column
0.500000
0.500000
20210423
57B6F394-F6E7-470C-A42F-9063A22DE213
Doug Jacoby
Merrick & Company
Project Manager
5970 Greenwood Plaza Blvd
Greenwood Village
CO
80111
doug.jacoby@merrick.com
US
303-353-3903
08:00 - 17:00, Mountain Time Zone, Monday-Friday, except holidays
Please contact during normal business hours
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