Edwardo,
I am attaching a PDF and RTF of the workflow I used to import paleocurrent data from a NetCDF file with rotated poles. While it may not exactly match your file, it should give you an idea of how to proceed. Let me know how it comes out.
processing workflow for current data.pdf (66.3 KB)
processing workflow for current data.rtf (5.33 KB)
Excellent!
I was warned here at NCAR that I would have a lot of trouble with these model data file unless I could find someone to help me with the arcane NCAR Computer Language (NCL) code to reproject them. When I said that with GRASS, georeferencing would not be that big a deal if I could somehow find proper geographic reference points or data layers, they were skeptical. Persistence paid off, however. I still don't have NCL working (though I want to try it), but the approach I sent you turned out very well for my data. It may even be better than the NCL approach, since NCL seems to use a simple bilinear interpolation to directly change the grid cells from POP grid to latlon. With mine, we reproject grid centers first before interpolating. We can then choose which interpolator works best for our particular question and data set.
Michael
On Mar 21, 2012, at 8:51 AM, Eduardo Klein wrote:
Michael,
Thanks a lot for the instructions. It worked perfectly on my files!
Saludos, EKS
On 03/20/2012 05:42 PM, Michael Barton wrote:
Edwardo,
I am attaching a PDF and RTF of the workflow I used to import paleocurrent data from a NetCDF file with rotated poles. While it may not exactly match your file, it should give you an idea of how to proceed. Let me know how it comes out.
Michael
On Mar 20, 2012, at 6:18 AM, Eduardo Klein wrote:
Thanks Michael, your advice will be much appreciated!.
Saludos, EKS
On 03/19/2012 04:39 PM, Michael Barton wrote:
I'm at NCAR right now and I'm doing that very thing today in fact.
Once I have an answer as to the difference between TLAT and ULAT, and TLONG and ULONG within the NetCDF files, I'll be able to give you a full work flow for this.
Michael
On Mar 19, 2012, at 2:44 PM,<grass-user-request@lists.osgeo.org> wrote:
Message: 3
Date: Mon, 19 Mar 2012 13:20:33 -0430
From: Eduardo Klein<eklein@usb.ve>
Subject: [GRASS-user] NetCDF rotated pole
To: grass-user@lists.osgeo.org
Message-ID:<4F6771E9.2080301@usb.ve>
Content-Type: text/plain; charset=ISO-8859-1; format=flowedHi,
Is there any way to read a NetCDF file which has a rotated pole Mercator
projection and have it inside GRASS with the North pole at North?I'm trying to use AVISO SSH products on GRASS 6.4.1 and gdal 1.8.0
Thanks!
--
Eduardo Klein
Lab Sensores Remotos e
Instituto de Tecnolog?a y Ciencias Marinas
Universidad Sim?n Bol?var
Caracas, Venezuela
ph (58) (212) 906-3111 ext 6700
fax (58) (212( 906-3111 ext 6701_____________________
C. Michael Barton
Visiting Scientist, Integrated Science Program
National Center for Atmospheric Research&
University Corporation for Atmospheric Research
303-497-2889 (voice)Director, Center for Social Dynamics& Complexity
Professor of Anthropology, School of Human Evolution& Social Change
Arizona State University
www: http://www.public.asu.edu/~cmbarton, http://csdc.asu.edu--
Eduardo Klein
Lab Sensores Remotos e
Instituto de Tecnología y Ciencias Marinas
Universidad Simón Bolívar
Caracas, Venezuela
ph (58) (212) 906-3111 ext 6700
fax (58) (212( 906-3111 ext 6701_____________________
C. Michael Barton
Visiting Scientist, Integrated Science Program
National Center for Atmospheric Research&
University Consortium for Atmospheric Research
303-497-2889 (voice)Director, Center for Social Dynamics& Complexity
Professor of Anthropology, School of Human Evolution& Social Change
Arizona State University
www: http://www.public.asu.edu/~cmbarton, http://csdc.asu.edu--
Eduardo Klein
Lab Sensores Remotos e
Instituto de Tecnología y Ciencias Marinas
Universidad Simón Bolívar
Caracas, Venezuela
ph (58) (212) 906-3111 ext 6700
fax (58) (212( 906-3111 ext 6701
_____________________
C. Michael Barton
Visiting Scientist, Integrated Science Program
National Center for Atmospheric Research &
University Corporation for Atmospheric Research
303-497-2889 (voice)
Director, Center for Social Dynamics & Complexity
Professor of Anthropology, School of Human Evolution & Social Change
Arizona State University
www: http://www.public.asu.edu/~cmbarton, http://csdc.asu.edu