Re: [OSGeo-Discuss] Atmospheric Corrections

2012-01-27 Thread Martin Landa
Hi, 2012/1/27 Johan Oldekop j.olde...@gmx.net: Unfortunately I do not have the the visibility [km] for the scenes. Is there a way of calculating these from the images? Are there any tables that one can look up, which contain approximate visibility ranges for very hazy, moderately hazy or low

Re: [OSGeo-Discuss] Atmospheric Corrections

2012-01-27 Thread Markus Neteler
On Fri, Jan 27, 2012 at 6:13 PM, Johan Oldekop j.olde...@gmx.net wrote: Hi All, Currently trying to do some atmospheric corrections on some Landsat 7 and ASTER images to compare forest cover over two time points. I am thinking of using the GRASSĀ i.atcorr function, which seems relatively