What are the gain setting rules?
The basis concept on the gain setting strategy applied by USGS is well explained in the Landsat Handbook. However, two points must be underlined: Landsat ETM+ instrument switches its gains by group of bands: Four bands groups can be discerned since the thermal bands are acquired simultaneously in a low and high gain state and as a result, never switch their gain. The four groups of bands are; Bands 1-2-3 Band 4 Bands 5-7 Band 8 For instance, HLHL is the same as HHH L H LH H L. In addition, the gain setting strategy has taken effect the day 195 of 200 (July 13th ). This strategy is based on other parameters including the sun elevation angle, cloud cover rate and earth cover type. IUt should be noted that this strategy is not absolute and also not always respected.
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