Positive reflectance values with FLAASH - NV5 Geospatial

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Last Post 08 Sep 2009 05:05 PM by anon

Positive reflectance values with FLAASH

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anon

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08 Sep 2009 05:05 PM
Hi, is it possible to get positive values of reflectance after FLAASH atmospheric correction for ASTER data? I understand that the inverse case is possible when low radiance values are present in the scene. I'm working over glacier surface so I presume that the sensor could be saturated with fresh snow. Thank you all. PZ

MariM

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09 Sep 2009 07:56 AM
It could be a saturation effect but it could also be an incorrect scale factor. The scale factor should be a value that is divided into the data to convert it to microW/(cm^2srnm). If this value is not correct, you can also get under and overflow of reflectance.

Deleted User

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09 Sep 2009 09:11 AM
Thks again mminari! I used the correct scale factor, so I can assume that it is caused by saturation of the sensor over high reflectivity surface. All the best pz

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