On Fri, 27 Aug 93 15:59:06 EST, Simon Cox wrote:
What is the best way to change the projection of a raster layer (eg ll to
utm).
I know that it can be done using the imagery functions, i.rectify, etc,
with judicious intervention of m.ll2u, etc, on the POINTS file,
but this seems like a crude instrument considering the equations are known!From my brief scan of the manuals there is an [a-z].proj for everything except
r ...
Suggestions anyone?
Thanks
Simon Cox
I second this point from Simon. Why is there no r.proj. v.proj works
nicely thankyou. But in a raster based GIS, surely r.proj is more
important - perhaps it is more difficult.
Dragging cell data out to ascii files and running PROJ.4 over them to go
from geog. to say, lcc, is a hell of a business. At present, it is easier
to import grass rasters into ArcInfo (which we fortunately have),
reproject, and take them back to grass. But that is also something of a
convoluted business. Likewise using an imagery rectification is not
something you want to do with hundreds of large rasters, which we and many
others have.
I don't normally whinge like this - must be a bad mood, or Simon hitting a
raw nerve!
Mike Hill
Michael J Hill
Research Scientist
CSIRO Pastoral Research Laboratory, Armidale, NSW, Australia,2350.
E-Mail address: mhill@chiswick.anprod.csiro.