Renae Mackas wrote: > I have used r.ing.dal to import different Landsat TIFF images, and am now > trying to superimpose red, green, and blue spectral bandsto get "real > colour" images. > > I am under the impression that I need to use i.landsat.rgb to > auto-balance the colours of the LANDSAT images I am using.
you do not "need" to use i.landsat.rgb, it just helps brighten things up if the image comes out rather dark. example: http://bambi.otago.ac.nz/hamish/grass/landsat/ > I am using a PC, does that mean you are running MS Windows? native or cygwin version? (sorry to be overly pedantic, but consider that many run linux on a PC, and that historically many/most? GRASS users use some flavour of Linux) > and when I run the command: > i.landsat.rgb red=020.020.2000.055_B30 > green=020.020.2000.055_B20 > blue=020.020.2000.055_B10 > > a microsoft windows window pops up that informs me " r.univar.exe has > stopped working- a problem caused the program to stop working correctly. > Windows will close the program and notify you if a solution is vailable". > As long as I continue to run the i.landsat.rgb command, > this window continues to pop up. can you run "r.univar 020.020.2000.055_B10" from the command prompt? > Have I made a mistake somewhere?? don't really know. might be an install problem. can you view the scene ok in QGIS? (www.qgis.org) > Also, once (if?) I do get i.landsat.rgb to work, will the map display > window automatically show me the superimposed images?? no. if you are currently viewing the layers you have to do a "hard" redraw as the GUI isn't aware that the colors have changed behind its back and the existing view may be partially cached. > Also, I have tried just running d.rgb on the same images: > > d.rgb red=020.020.2000.103_B30 blue=020.020.2000.103_B20 > green=020.020.2000.103_B10 if this is the native build d.rgb shouldn't work from the command prompt, as there are no xmon to draw to (d.mon + UNIX's X-Windows). Instead use the 'Add RGB or HIS layer' button from the GIS manager. the cygwin version uses X-Windows (aka X11) and so allows xmons. good luck, Hamish _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
