Asefa Areda wrote: > Dear All: Hello Asefa,
> I want to reduce layers from NOVASOL hyperspectral image cube which has 140 > bands/layers. > 1) How can I perform layer reduction I have no experience with Hyperspectral imagery. But PCA should be a valuable option to consider. Have a look at the manual <http://grass.osgeo.org/grass64/manuals/i.pca.html> and some examples in a GRASS-Wiki page <http://grasswiki.osgeo.org/wiki/Principal_Components_Analysis#Using_i.pca> > 2) If I want use* i.atcorr *should I process only a single layer at a time? You "can" only process one layer per run. > 3) if 2) is not how do I process all the layers in one go (the txt? 4) Is > there any means to include a new sensor outside what is lited in the > ''predefined sensor'' e.g., 64: 4th band of ETM+ Landsat 7 a) You need to script it in order to get it run for multiple "layers" in one go. If you work under Linux, I can send you a Bash shell linux script (off- list) I have used to run i.atcorr for some Landsat scenes. It'll sure need some hand-crafting as there are some hardcoded stuff. Maybe some-one has already a "clean" solution on that. b) For "adding new band filters", have a look at: <http://trac.osgeo.org/grass/browser/grass/trunk/imagery/i.atcorr/README> Regards, Nikos _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
