aerial photo mosaic
Joe.Leone at per.dwe.csiro.au
Thu Aug 14 22:46:15 EDT 1997
I have been trying to create a mosaic from aerial photo. I have managed to get
the photos into GRASS and rectified them using the imagery commands. (Thanks to
help from the list!)
When I use d.rast -o "filename" for each of the images they display correctly (
In the correct geographic position with some overlap).
Now I am trying to create one GRASS raster file using r.patch.
If I use the command "r.patch input=009,007,005 output=patched",
005 displays correctly. ie I can see roads, and other features. However, 009 and
007 are in the coorect positions but the pixels are jumbled - I can not
Things I have tried.
run r.support on 009 007 etc
r.resample before r.patch using the default region
specified both the default region and the minimum regions in i.rectify2
r.mapcalc "newmap= if(009,009,007)" - In this case none of the features are
It is something to do with the fact that some photos are "darker" than others?
Any suggestion ?
Western Australian Laboratory
CSIRO Wildlife & Ecology
LMB 4, PO MIDLAND WESTERN AUSTRALIA 6056
Phone +61 8 9290 8108
Fax +61 8 9290 8134
Email Joe.Leone at per.dwe.csiro.au
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