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How would a ratio of TM 4/TM 3 compare for vegetation and soil?

April 26, 2017compare ratio soil TM vegetation

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How would a ratio of TM 4/TM 3 compare for vegetation and soil?

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This ratio is a vegetation index. Pixels containing green vegetation will show a higher value for this index as compared to soil because (1) the reflectance of vegetation is much greater in band 4 than that of soil and (2) dry soil typically has higher reflectance in band 3, the red band, than vegetation.