Aerial Photography

High-resolution imagery is most often 1-foot resolution and covers 5000 feet x 5000 feet on the ground. Occasionally imagery at 1/2-foot or 2-foot resolution is collected. Most counties are flown once every three years as part of a statewide cycle, with the flying season usually running from November through March. This imagery is in State Plane projection and MrSid file format.

In 2016, an updated datum (NAD83_2011), was used for aerials for some counties. In these counties, the .sid files are delivered as they came from the vendor. We cannot recreate lower generation .sid files for these images. In the past, some GIS and CAD systems cannot use higher version sids. Check the image inventory to identify the counties using the updated datum.

Purchase or Download 2006-2016 Imagery Now »

DOQQ Historical Downloads

A digital orthophoto quarter-quadrangle (DOQQ) is a digital image of an aerial photograph that has been ortho-rectified. DOQQs are 1-meter resolution and covers an area on the ground of 3.75-minutes longitude by 3.75-minutes latitude.

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2004
Image Units Color Format
2004 RGB UTM MT RGB JPEG 2000
2004 RGB UTM MT RGB MrSID
2004 RGB State Plane FT RGB JPEG 2000
2004 RGB State Plane FT RGB MrSID
2004 RGB Albers MT RGB JPEG 2000
2004 RGB Albers MT RGB JPG
2004 RGB Albers MT RGB MrSID
2004 CIR UTM MT Color Infrared JPEG 2000
2004 CIR Albers MT Color Infrared JPEG 2000
2004 CIR State Plane FT Color Infrared JPEG 2000
1999
Image Units Color Format
1999 CIR UTM MT Color Infrared MrSID
1999 CIR Albers MT Color Infrared JPG
1999 CIR State Plane FT Color Infrared MrSID
1995
Image Units Color Format
1995 CIR Albers MT Color Infrared MrSID
1995 CIR Albers MT Color Infrared JPG