[Proj] inverse projecting ASCII data

[Ken Mankoff]

Hi List,

I'm completely new to proj and fairly new to projections in general 
at this level of detail, although I've been making maps for years 
with higher level tools (IDL).

I now have an ASCII file centered on the south pole. I'd like to 
inverse project it to a simple cylindrical gridded data set of, for 
example, 1x1 degree latitude longitude boxes (eventual goal: Google 
Earth layer that requires pole at edgcm of image).

I've been reading the man page for invproj but am not able to get 
far at all. I don't know much about the data but I do know this:

* Polar Stereographic, 71S as true lat scale
* Grid is 5km
* I know the number of rows and columns of the input ASCII file
* And that "xllcorner: -2713600" and "yllcorner: -2304000"
   but I don't know what these mean

I've come up with this mostly from an old archive post:

invproj +proj=stere +lon_0=0 +lat_0=-90 +lat_ts=-71 proj.test.in > proj.test.out

But don't fully understand the output,  which looks like this:

> 135dW   89d52'11.473"S -9999 ....
> 135dW   89d52'11.473"S -9999 ...
and then suddenly
> 0dE     90dS 0 0 ...

Any help greatly appreciated.

Thanks,

   -k.

-- 
Sent from Antarctica: http://pace.edgcm.columbia.edu