Re: Re-gridding to Polar Coordinates & Rotating

Hi Tom,

I'm not entirely sure what you are wanting to do here. lat/lon
coordinates are geographical coordinates, effectively spherical
coordinates for most practical purposes. Are you wanting to project
these values onto a planar polar projection and then derive polar
coordinates rather than cartesian? The cartographic projection can not
be done within NCL currently. I'd recommend taking a look at the Proj4
library for this purpose:

http://trac.osgeo.org/proj/

It has a C-API as well as a command-line utility that's pretty easy to
use.

Rick

On Wed, 26 Feb 2014 10:26:31 -0600
  Tom Hultquist <hultq016@umn.edu> wrote:
> I have data in cartesian (lat/lon) coordinates that I need to
>re-grid to
> polar coordinates (with a fixed lat/lon (x/y) coordinate within the
>files
> serving as the 0,0 point in the r, theta polar coordinate grid). In
> addition, once re-gridded, I need to remap the grid by changing the
>theta
> value (would be a variable change from file to file depending upon a
>given
> delta-theta I would set). Is this doable within NCL, or will I need
>to find
> a way to do this prior to bringing the data into NCL (and if that is
>the
> case, does anyone have a suggestion on how to do so). Thank you.
>
> tom
>
> ---------------------------------------------------------
> Tom Hultquist
> University of Minnesota
> Department of Soil, Water, & Climate
> Borlaug 165
> hultq016_at_umn.edu<https://mail.google.com/mail/?view=cm&fs=1&tf=1&to=hultq016@umn.edu>
> 612-208-2127

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Received on Tue Mar 4 10:22:35 2014