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| General
Information
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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. It combines the image characteristics of a photograph with the geometric 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. Each DOQ has between 50 and 300 meters of overedge image beyond the latitude and longitude corner crosses embedded in the image. This overedge facilitates tonal matching and
mosaicking of adjacent images. All DOQ’s are referenced to the North American Datum of 1983 (NAD83) and cast on the Universal Transverse Mercator
(UTM) projection. Primary (NAD83) and secondary (NAD27) datum coordinates for the upper left pixel are included in the header to allow users to spatially reference other digital data with the
DOQ.
If you need help locating a USGS quad map name, try
our FREE USGS MapFinder
utility.
 USGS
DOQQ Fact Sheet (79 Kb)
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| Specifications |
- Standard UTM (Universal Transverse Mercator), State Plane and Latitude / Longitude projections
- Lambert, Albers and other projections available for more information e-mail
- Formats: geotiff, tfw, or MapInfo tab files
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| Download Sample |
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This is a clipped
portion of the SE quadrant of Lombard, IL.
Projection:
UTM (16N), NAD83
Source date: 17-APR-98
Click
to download (610 Kb) |
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This is a clipped
portion of the NW quadrant of Union Springs, NY.
Projection:
UTM (18N), NAD83
Source date: 16-APR-95
Click
to download (1,280 Kb) |
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| Pricing
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Digital Ortho Quarter
Quads (DOQQs)
1 meter resolution, 3.75 min x 3.75 min |
| Quantity |
BW (256 grayscale)
Price (UTM NAD83) |
Color IR
Price (UTM NAD83) |
| 1 to 499 |
$7.00 ea |
$10.00 ea |
| 500
+ |
$5.00
ea |
$7.50
ea |
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Setup charge: $30.00 (for
quantities less than 500)
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Add 20% for other projections
(UTM NAD 27, State Plane, Lat/Long, etc.)
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Mosaic charge: add $5.00 per
DOQQ
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Image clipping: add $ 40.00
to clip image to user defined boundary area.
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Compression to MrSID or ECW =
add $5.00 per image
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We
offer quantity discounts and State bundle discounts.
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| CIR
to Natural Color DOQQs
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If you are you looking for DOQQs with natural color, then DDS, Inc.
has your solution. For DOQQs covered by color-infrared (CIR), DDS
can convert those CIR images to appear in natural color. This is
an ideal solution for inexpensive, presentation-quality base
photography.
Pricing: Add $5.00 per DOQQ
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| Placing Orders |
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To expedite your order please call or email your request. If
you do not know the map names, we can provide assistance identifying the
coverage area you need.
Digital Data Services, Inc.
voice: 303-986-6740
toll-free: 866-337-7226
email:
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