Dear All, In Grass, the Atmospheric Correction tool (i.atcorr) reference do not provide information with regards to the parameter "visibility for the aerosol model [km]" in the control file. I have searched exhaustively online. But could not find the data source or methodology to generate it. Does it mean Vertical visibility? As far I can understand, the parameter should be independent of the visibility map (because visibility map raster cell value reflects count # of other cells it can see).
I have already explored the Aeronet website but could not find any Visibility (km) data. I am familiar with the alternate method (Setting visibility equal to zero and providing ADO at 550 nm) but I would like to explore the other method using DEM, visibility map and visibility for the aerosol model [km] parameters. Please let us know the data source (if there is any) and calculation methodology for "visibility for the aerosol model [km]" preferably, in layman's term. Kind regards, Imtiaz
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