* Kamhul Camhol <[email protected]> [2015-06-03 04:56:37 +0000]: > Hello. I'm quite new with GRASS but I need to atmospherically process > high-resolution imagery with i.atcorr. I have three images Quickbird, > GeoEye-1 and Worldview-3 imagery of a single scene across three time periods.
Hi! You would need, I think, to convert the raw Digital Numbers first to radiance/reflectance values. Please have a look at [0][1]. > For Quickbird, I have all the data needed but basing from the following > manual GRASS GIS manual: i.atcorr there appears to be novalues for two > required inputs for GeoEye-1 and Worldview-3. I have prepared months ago the numbes for QB2 and WV2 Yet, there has been no successful test so far (from my side at least). I need to try again :-/. Are you willing to support testing? > These are geometrical conditions and band. May I know if GRASS has updated > the i.atcorrmanual to include these sensors as well? > Can I use the values ofWorldview-2 for Worldview-3? I think not. We need to get the radiometric response values for WV3. Then we can prepare the required data for i.atcorr. But, as with the other two, it needs testing. > Or is there any other way to do the atmospheric correction for these two > sensors? There are other tools that could do this. I think ORFEO ToolBox is one (from which I stole the numbers for QB2 back then). Yet, having this option in GRASS will make the workflow easier. We need it. Nikos _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
