maven apache: > When import some raster data to grass,I use the following cmd: > 1) g.region -d
This sets to the "default" region which one previously needs to define, i.e. needs to create with "g.region -s". Please check the manual of g.region. > 2) r.in.gdal input=D:/test.TIF output=testTT --overwrite > I got the error message as following: > --------------- > Projection of dataset does not appear to match current location. >Location PROJ_INFO is: >name: UTM >datum: nad27 [...] > Import dataset PROJ_INFO is: > cellhd.proj = 0 (unreferenced/unknown) > ------------------------ That's seems normal. Your test.TIF either isn't georeferenced or it lost its geotags at some point (after editing with non-GIS tool perhaps?). > 3) change the cmd to " r.in.gdal -o input=D:/test.TIF output=testTT > --overwrite " I know this override the projection,however I am not > sure the potential effect to the data. You should use that only if you _know_ that your test.TIF data are projected in the system that your grass-location is defined (e.g. "datum: nad27" as one can see in the error message above). If your data (test.TIF) are projected in another proj. system expect errors. > Now the tiff is imported,and I got testTT.bule testTT.red > testTT.green, then I open them can only see blank. So I wonder it is > caused by the projection or location,I use the spanish data as the > default location , and I tried to create new location and mapset but > never success... So, given that test.TIF is in "UTM, datum: nad27" then you need to: 1. import with r.in.gdal -o (as you already did). 2. g.region rast=testTT.blue 3. view your data If the test.TIF data are projected in another system you need to: 1. find out which is that projection system 2. use some gdal tools to assign the proj. information in the test.TIF file 3. define a "new" grass-location based on the projection information of the test.TIF data 4. import with r.in.gdal (without the use of "-o" flag) 5. g.region rast=OneOfTheImportedBands 6. view, process, etc. Greetings, Nikos _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
