Illinois Natural Resources Geospatial Data Clearinghouse Geospatial Data Clearinghouse Home


2004 Illinois NAIP Digital Orthophoto Quadrangle Data

Illinois National Agriculture Imagery Program (NAIP) Digital Orthophotography quarter Quadrangle (DOQ) data have been created for 102 counties in the Universal Transverse Mercator (UTM) coordinate system with a NAD83 datum. NAIP acquires color-infrared digital ortho imagery during the agricultural growing seasons in the continental U.S with a 2 meter ground sample distance. NAIP imagery can obtain as much as 10% cloud cover per tile. Imagery for this data collection was acquired in the months of June through September, 2004.


Map of 2004 NAIP DOQ Data Extents
2004 NAIP
DOQ Data Extents

Data Distribution: Compressed Data

Data files are offered as LizardTech's MrSID Generation 2 .sid files. Target compression ratio was 4:1; one compressed file is roughly 8 magabytes in size.


A statewide collection of 2004 NAIP data requires about 31 Gigabytes of storage space. We do not plan to distribute compressed data files by any other means (cd-rom, zip drives, portable drives, ftp download, etc).


Illinois 2004 compressed NAIP DOQ data are available free-of-charge via:
a List of Counties for UTM data download.

Metadata:
Original USDA 2004 NAIP metadata for one sample file.

File index:
naip2004.zip - shapefile file index in Geographic Decimal Degrees.

Data Distribution: Uncompressed Data

An ArcIMS web service is being created from the original GeoTIFF files loaded into ArcSDE.


Contact the Illinois State Library to obtain indiviual, uncompressed Illinois 2004 NAIP orthoimagery files.


Project Support for Data Distribution

Project funding was contributed by the US Geological Survey.