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Corn+Soybean Digest

Satellites And Planes Scan Cornfields For Clues

For the past three years, an airplane has been flying over a USDA research center in Beltsville, MD, carrying an "electro-optical" scanner that functions like a remote light meter with a camera-like lens protruding through the plane's underside.

USDA's Agricultural Research Service (ARS) and the National Aeronautics and Space Administration (NASA) helped a company in Maryland develop the scanner system. As part of a cooperative research agreement with GEOSYS, Inc., of Plymouth, MN, ARS is testing to see if the scanner's images can be used to delineate consistent variations – high and low yielding spots – in farmers' fields to define "management zones." The researchers will identify likely spots by light reflected from the foliage – the more foliage, the higher the

expected yield.

The initial tests are being done with cornfields in Maryland and Minnesota.

Project organizers are using the scanner images, converted to computer maps,

as overlays to existing maps, including crop yield maps. Their goal is to

tie the images to a land feature, such as the capacity of soil at a specific

location to hold water, or land slope, that may be causing consistent yield


GEOSYS has expertise in analyzing imagery and handling other types of

spatial (map-like) information for precision farming. As USDA's chief

scientific agency, ARS has expertise in remote sensing, yield prediction,

and precision farming.

The CRADA is part of an ARS research project as well as a NASA project that

also involves Cargill Research, a major agribusiness firm that hopes to use

aerial and satellite imagery for precision farming.

If the maps produced by this project were to be commercialized for precision farming, they would be available for farmers to load into computers on their tractors. Then as farmers drove the tractors across their fields, the computers would adjust the amount of fertilizer or the type and amount of seed, for example, for high- and low-yielding areas.

For more information contact Charles L. Walthall, ARS Hydrology and Remote Sensing Laboratory, Beltsville, Md., phone 301-504-6074, fax 301-504-8391, [email protected]

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