Grads:PDEF for tranverse Mercator (native grids)

[Jennifer Adams]

Hi, Willis --
You should subscribe to the gradsusr list and post this request there
-- that way you have 1800 other users who might be able to help you. I
have no experience dealing with files on a transverse mercator
projection, but I can tell you that you have two options with pdef:
1. Create a pdef file for use with the PDEF BILIN option. You need to
be able to calculate the i,j values (in the native transverse mercator
grid) of a given lat/lon pair (which are the coordinates of the
destination grid). Then GrADS does bilinear interpolation from the
four grid points surrounding the i,j values.
2. Create a pdef file for use with the PDEF GENERAL option to create
your own mapping of interpolation values and weights to use.

--Jennifer


On Nov 12, 2009, at 3:27 PM, <willshem at uga.edu> <willshem at uga.edu>
wrote:

>
> From: <willshem at uga.edu>
> Date: November 9, 2009 4:36:08 PM EST
> To: jma at COLA.IGES.ORG
> Subject: Grads:PDEF for tranverse Mercator (native grids)
>
>
> Hi! Jennifer Adams
>
> My name is Willis Shem. I am a post-doctoral research associate at
> the University of Georgia in Athens (USA)
>
> I have been trying to display (in a grads map) some model output
> data which is pre-projected (mapped on a transverse mercator
> projection). I am having trouble making up the right PDEF format to
> interpolate the data to either rectilinear grids or any other
> projection. I would greatly appreciate your help with this. Thanks
> in advance.
>
> Dr. Willis Shem
>
>



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