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sig-gis / Ecuador_SEPAL

processing script for Sentinel-2 and Landsat-8

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The spectral response function is different for sentinel-2A and -2B

lauraset opened this issue · comments

commented

Hello, in the sentinel2.py script, I note that you used predefinedwavelengths of sentinel-2A, but the wavelength is different for sentinel-2A and -2B satellites. I guess this parameter should change according to relevant satellite.

commented

Hi laurset, nice find there. I added in some logic to check the satellite and switch the predefined wave lengths accordingly.

commented

Hello, jdilger, thank you for your reply. Actually, according to the py6s documentation ( https://py6s.readthedocs.io/), the predefinedwavelengths for band 8A-13 are:
bandSelect = {
...
'B8A':PredefinedWavelengths.S2A_MSI_8A,
'B9':PredefinedWavelengths.S2A_MSI_09,
'B10':PredefinedWavelengths.S2A_MSI_10,
'B11':PredefinedWavelengths.S2A_MSI_11,
'B12':PredefinedWavelengths.S2A_MSI_12,
}
Besides, the SRTM 30 (=ee.Image('USGS/SRTMGL1_003')) may be an alternative.

commented

Hi Laurset, I went and updated the bands to the correct key/values. I am leaving the dem though as there may have been a reason we were using that over the 30m product.