Dear all,
thanks to all who replied to my question on the polar projections. My data is
really in Polar Stereographic Projection, but AFAIK it is not on the list of
projections supported by GRASS (is this right?). I have found that only UPS
supports polar projections.
r.proj has failed for me when I was trying to reproject data from LatLon
location to my polar setup. I was not able to reproject my data into, say
sinusoidal projection. Does anybody can provide a working example and a dataset?
But here's another question. How can draw a geographic grid over my data?
d.grid seems to produce only rectangular grids. Or am I doing something totally
wrong?
Thanks,
Anton
On Mon, Nov 11, 2002 at 11:36:12AM -0800, Anton B. Ivanov wrote:
Dear all,
thanks to all who replied to my question on the polar projections.
My data is really in Polar Stereographic Projection, but AFAIK it is
not on the list of projections supported by GRASS (is this right?).
I have found that only UPS supports polar projections.
Well, I'm confused... Apparently, Polar Stereographic is a limiting form
of Lambert Conformal Conic (as is Mercator), but the "proj" docs discuss
polar stereographic and UPS in relation to Azimuthal projections and
you're right that there doesn't seem to be a distinct Polar
Stereographic. I did some tests against another package providing a
polar stereographic and I couldn't find a combination of parameters for
"lcc" or "stere" where the coordinates came out close. Hmm...
But here's another question. How can draw a geographic grid over my
data? d.grid seems to produce only rectangular grids. Or am I doing
something totally wrong?
AFAICT, d.grid doesn't try very hard to do a graticule correctly. Works
okay for projected coordinate systems...
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