Available for Immediate Download!
- 8-Meter Geo-Referenced DOQQs
$3 a quarter-quad
Each Digital Orthophoto Quarter Quadrangle (DOQQ) covers an area of
3.75 minutes of latitude by 3.75 minutes of longitude (Roughly 3
1/2 miles by 4 1/2 miles). The scale is 1:12,000 with a
resolution of one or eight meters. The photography is
geo-referenced so that other digital map data layers can be
overlaid and used in various ways.
DOQQ's have between 50 and 300 meters of over edge, sufficient to
facilitate tonal matching for mosaicking and the placement of
NAD 83 and NAD 27 quarter-quadrangle corner ticks that are
embedded in the image. Through image mosaicking two or more
rectified images can be combined and merged into one image. For
instance, mosaicking four DOQQ's can produce a digital
orthophoto in 7.5-minute format. File Size of One-Meter DOQQs in
TIFF format are approximately 45 Megabytes for Black-and-White and 145 Megabytes for Color Infared or CIR. Eight Meter DOQQs in
JPEG format are approximately 200KB.
Formats include: TIFF, MapInfo, ArcView, AutoCAD and Others
Note: One Meter DOQQs are not available for immediate download, Eight Meter DOQQs are available for immediate download