Iporting different kinds of raster layers

[Agustin Lobo]

Could'nt you use the proj package by Evenden? It used to be part
of the grass garden. 

Agus


****NOTE NEW PHONE NUMBER*****
Dr. Agustin Lobo
Instituto de Ciencias de la Tierra (CSIC)
Lluis Sole Sabaris s/n
08028 Barcelona SPAIN
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alobo at ija.csic.es
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On Wed, 10 Feb 1999, Stephan Eickschen wrote:

> Hi everybody-
> 
> I need a little bit assistance in projection stuff, importing
> raster files etc.
> 
> What I have:
> ============
> 
> Different kind of datasets:
> 1) passive microwave, gridded on a regular grid as shown in the figure.
> 	(it is the SSM/I - NSIDC grid)
> 
> 2) optical and infrared raw data (AVHRR)
> 3) gtopo30 topography
> 
> What I did:
> ===========
> 
> Set up a GRASS5 mapset which fits the SSM/I grid; it is an x-y mapset.
> 
> What I want:
> ============
> 
> Import datatype 2) and 3) into this mapset. :)
> In case of the AVHRR data I am able to choose from a varity of
> projections
> in which I want to have the raw data after some basic processing, but
> there
> are "only" geographic ones (like polar stereographic, which I thought it
> would be most suitable, since the SSM/I grid is based on a polar
> stereographic grid - unfortunatly, I am not able to get a dataset with
> the
> same edges as the mapset - it is always of the shape of trapecoid (sp?))
> If I know how to import the gtopo30 into my mapset I will be able to
> manage
> the AVHRR data since gtopo30 is in "Equidistant Cylindrical" - I can get
> the
> AVHRR data into a similar grid...
> 
> lat = -39.23 deg              lat = -39.23 deg
> lon = 317.76 deg              lon =  42.24 deg
>        +----------- 4350 -----------+
>        |                            |
>        |                            |
>        |                            |
>        |                            |
>        |                            |
>     -3950             o           3950
>        |           Southpole        |
>        |                            |
>        |                            |
>        |                            |
>        |                            |
>        |                            |
>        +---------- -3950 -----------+
> lat = -41.45 deg              lat = -41.45 deg
> lon = 225.00 deg              lon = 135.00 deg
> 
> dx = 12.5
> dy = 12.5
> 
> (A (slightly) better image is available at
> 	http://www-nsidc.colorado.edu/NASA/GUIDE/SSMI/gridmap.JPG
> on the right side - even though the anotations of the upper right and
> the
> lower left corner have to be changed...)
> 
> What I don't know:
> ==================
> 
> is how to "jump" between / fit / take account to the different types of
> projections (how ever you want to call it)...
> 
> Any suggestions will be highly appriciated!!!
> -- 
> ------------------------------------------------------------------------
> 
> Stephan Eickschen                     Tel. : +49 (0)251 83-34704
> Westfaelische Wilhelms-Universitaet   Fax. : +49 (0)251 83-36100
> Institute for Geophysics
> Research Unit of Physical Glaciology  email: eicksch at uni-muenster.de
> Corrensstrasse 24
> 48149 Muenster
> Germany
> 		http://earth.uni-muenster.de/~eicksch/
> ------------------------------------------------------------------------
>