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.
USDA-FSA-APFO Aerial Photography Field Office and Illinois State Geological Survey