1998-1999 USGS Digital Orthophoto Quarter Quadrangles

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Dataset Basics

A Digital Orthophoto Quadrangle (DOQ) is a computer-generated image of an aerial photograph in which the image displacement caused by terrain relief and camera tilt has been removed. The DOQ combines the image characteristics of the original photograph with the georeferenced qualities of a map. The standard DOQ’s produced by the U.S. Geological Survey (USGS) are either grayscale or color-infrared (CIR) images with a 1-meter ground resolution; they cover an area measuring 3.75- minutes longitude by 3.75-minutes latitude, approximately 5 miles on each side or a quarter of a USGS 7.5 minute quad.

This dataset was provided to IU by the Natural Resources Conservation Service (NRCS), a component of the US Department of Agriculture.

File Formats

Coordinate System: UTM, Zone 16 North
Horizontal Datum: NAD83
Pixel Resolution: 1 meter
Scale: 1:12,000 Individual DOQQs

File Format: GeoTiff (~40MB/file)
Compression: uncompressed

File Format: Single ECW Mosaic of all images(~4GB file)
Target Compression ratio: 10:1

File Format: MrSID MG2 (~2 MB/file)
Target Compression: 20:1

Original File Format: BSQ (45 MB/file)
Compression: uncompressed
Available for download on web directory only

FIle Format: MrSID MG2 Mosaics
Mosaiced by USGS 100k tiles
Target Compression: 20:1