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acreage aerial photography agricultural surveys application areas application of remote area data ASCS cameras Colwell conservation cover crops crop and livestock crop identification crop vigor analysis cropping practices Department of Agriculture Detailed soils detection developed Partially developed disease electromagnetic spectrum experiments f-number farm Feasible Feasible Feasible Field mapping Field Field mappinp film-filter combinations flood focal length Frequenoy ground resolution Identification of crop identified image interpretation capabilities infrared photography inventory land capability livestock major land measured meters Minimal Minimal Minimal Multiband photography multispectral sensing nonphotographic sensors objects and conditions observations obtained panchromatic film Panchromatic photography Partially developed Partially photographic imagery photographic interpretation techniques photographic sensors photographs taken plant potential agricultural applications Purdue Universities radar range conditions recording medium remote sensing resolution capabilities resolution requirements scale sensor types soil surveys soils classification space altitudes space platforms stereoscopic U.S. Department Undeveloped Undeveloped Undeveloped vegetation Weslaco wide-area coverage yield