Remote sensing

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False color image of Nashville, Tennessee, set for RGB rastor of 4,3,2. Vegetation is listed at red; man-made objects are gray.

Remote sensing is the science and art of obtaining information about an object, area, or phenomenon through the analysis of data acquired by a device that is not in contact with the object, area, or phenomenon under investigation.

Examples

The following illustrates how remote sensing can be used to detect areas of flooding that would normally be missed by ordinary photography; in this case the area is New Orleans before and after the imapct of Hurricane Katrina on August 28, 2005.

  • New Orleans, Louisiana, August 2005; the images here were taken with the Landsat satellite and run through the ERDAS Imagine program.

  • Same image but with the RGB rastors set for 4,5,7 to highlight water areas.

  • New Orleans, Louisiana on September 2, 2005 following damage done by Hurricane Katrina on August 28.

  • Same image, with the RGB rastors were set to 4,5,7, which has picked up the presence of water remaining within what should be dry land.

See also

References

List of USDA terminology

United States Department of Agriculture Terms

Aerial photograph; Artificial and modified surfaces; Barren; Barren land; Beach; Census water; Climatic factor; Close-grown crops; Conservation practice; Conservation Reserve Program; Conservation Reserve Program land; Cover and management factor; Cowardin system; Cropland; Cropping history; Deepwater habitat; Developed land; Erodibility index; Erosion (USDA); Estuarine Wetland; Farmsteads and ranch headquarters; Field; Forest land; General cover; Growing season; Habitat composition; Habitat configuration; Habitat patch; Hayland; Herbaceous; Horticultural cropland; Irrigated land; Lacustrine System; Lake (land type); Land capability classification; Land cover/use; Large streams; Large urban and built-up areas; Large water bodies; Marine System; Marshland; Mines, quarries, and pits; Minor land cover/uses; Mud flat; Open canopy short woody plants; Open canopy tall woody plants; Other aquatic habitats; Other rural land; Ownership; Palustrine Wetland; Pastureland; Perennial stream; Personal Digital Assistant ; Photographic interpretation; Practice factor; Primary sample unit; Prime farmland; Railroads; Rainfall and runoff; Rangeland; Remote sensing; Reservoir (land type); Ridge roughness; Riverine System; Riverwash; Row crops; Rural transportation land; Saline deposits; Salt flats; Sample point; Sand dunes; Sheet and rill erosion; Short woody plants; Silviculture; Slope (land type); Slope length; Slope-length factor; Slope-steepness factor ; Small built-up areas; Small streams; Small water bodies; Soil erodibility factor; Soil erodibility index; Soil loss tolerance factor ; Soil survey; Stream (land type); Tall woody plants; Universal soil loss equation; Unsheltered distance; Uplands (land type); Urban and built-up areas; Vegetative cover; Water (land type); Water areas; Water body; Water spreading; Wetlands (land type); Wetland losses; Wind erodibility group; Wind erosion; Wind erosion equation;

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