[GRASSLIST:69] how to use T62 gaussian grid system in GRASS?

[Vishal Mehta]

Hi all,

I'm trying to use NCEP/NOAA surface energy flux datasets
http://www.cdc.noaa.gov/cdc/data.ncep.reanalysis.html in GRASS. There are 2
issues with this-
1. they are mostly in netcdf format
2. Many of these datasets come in funky 'T62 Gaussian grids'.

I managed with many people's help on this list to get netcdf into grass
rasters (using gdal_translate and r.in.gdal), but the data is wrong. I'm
sure its because of this T62 Gaussian coordinate system that its in. The
only metadata i have for it is:
that its a non-linear lat-long grid;
from 88.5425N to 88.5425S,
0E to 358.125E
192*94 points

of approximately 1.8 degree resolution.

How do i create a location in GRASS to handle this? I have tried several
things that dont work. These include:
-letting r.in.gdal create its own location
-trying to bring it into a location that is 180W to 180E, 90S to 90N

I have thought about doing an x-y grid of 192*94 cells, but since the
original is non-linear, it would probably be wrong..
I also dont know (and could'nt find out online), whether 0E in the T62 grid
is 180W or not; also could not find T62 in the epsg code file.

any ideas for this?
thanks,
vishal
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