Landsat Orthoimagery Mosaic
Contents:
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Landsat Mosaic subset image (South Central Arizona) |
Description
Orthoimagery combines the image characteristics of a photograph with the geometric
qualities of a map. The Landsat Mosaic orthoimagery database contains Landsat
Thematic Mapper imagery for the conterminous United States. The more than 700
Landsat scenes have been resampled to a 1-arc-second (approximately 30-meter)
sample interval in a geographic coordinate system using the North American
Horizontal Datum of 1983. Three bands have been selected from the eight
spectral bands available for each frame. These are bands 4 (near-infrared),
3 (red), and 2 (green), typically displayed as red, green, and blue, respectively.
The image is a full-resolution (spectral and spatial), 24-bit color-infrared
composite that simulates color infrared film as a "false color composite".
These data have been created as a result of the need for having geospatial
data immediately available and easily accessible in order to provide geographic
reference for Federal, State, and local emergency responders, as well as for
homeland security efforts. Orthoimages also serve a variety of purposes,
from interim maps to field references for earth science investigations and
analysis. The digital orthoimage is useful as a layer of a geographic information
system. This data can be used to provide reference information for Web browsers
and for map applications at a scale of 1:100,000 or smaller. Larger scale
orthoimagery such as digital orthophoto quadrangles will be more accurate,
but often at the expense of timely updates.
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Specifications
Landsat Orthoimagery Mosaic |
Resolution |
1 arc-second (approx. 30m)
- Conterminous U.S. |
Projection |
Geographic |
Horizontal Datum |
NAD83 |
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Format Information
GeoTIFF with world file
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Download Information
Landsat Orthoimagery Mosaic |
Delivery
Options |
Cost |
Format |
Availability |
Free Download up to 250 MB increments |
No
Charge |
GeoTiff |
Conterminous
US
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