How to determine Grass (i.atcorr) tool control file's "visibility for the aerosol mod
In Grass, the Atmospheric Correction tool (i.atcorr) reference lacks information with regards to the parameter stated in the control file, "visibility for the aerosol model [km]" 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. Please explain the data source and calculation methodology for "visibility for the aerosol model [km]" in layman's term.
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In Grass, the Atmospheric Correction tool (i.atcorr) reference lacks information with regards to the parameter stated in the control file, "visibility for the aerosol model [km]" 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. Please explain the data source and calculation methodology for "visibility for the aerosol model [km]" in layman's term.
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