Digital Orthophoto Quadrangles (DOQQ)

Small image of Geologic Map Data

A digital orthophoto quadrangle (DOQ) is a computer-generated image of an aerial photograph in which image displacement caused by terrain relief and camera tilts has been removed.

DOQQ images avaialbe on the DNR GIS Data Clearinghouse are Color-infrared (CIR) with a 1-meter ground resolution covering an area measuring 3.75-minutes longitude and 3.75-minutes latitude. Each image has between 50 and 300 meters of overedge beyond the latitude and longitude corner crossess embedded in the image to faciliate tonal matching and moasaicking adjacent images.

A DOQ can be incorporated into any geographic information system (GIS) that can manipulate raster images. It can function as a cartographic base for displaying, generating, and modifying associated digital data.

Joint Funding Agrrements (JFAs) with various other agencies funded the DOQQ data acquisistion for 1994, 1999, and 2006.

Geographic Coordinate System

UTM, Zone 17, Meters, Datum NAD83

Compressed Format for DOQQ Data

1994, 1999 - MrSid; 2006 - JPEG2000

Please consult your particular software's help to determine compatibility with this format and any required software updates and/or plugins.

Status map of available DOQQ

1994 DOQQ Coverage (PDF)

1999 DOQQ Coverage (PDF)

2006 DOQQ Coverage (PDF)

Download Available DOQQ

Data is available for download at no cost from DNR's GIS DNR Clearinghouse.