Re: Re-mapping problems

George,

Do you have a sample CFSR dataset you can point us to? I need to know what
kind of grid it’s on before I can answer this question. By this I mean is your
data on a rectilinear grid, a curvilinear grid, or an unstructured grid?

Also, how big is the original lat/lon grid?

Meanwhile, please check out our ESMF regridding page, which has our most
robust regridding capabilities.

http://www.ncl.ucar.edu/Applications/ESMF.shtml

The ESMF_regrid_x.ncl scripts on this page are probably the ones you want to
look at, as they are a bit more simple than the ESMF_all_x.ncl scripts.

Most of these examples show how to regrid from some grid to a specific degree
of grid, like 0.25 degree, or 1 degree. You can look at examples 4, 7, 10, and 15
to start with:

http://www.ncl.ucar.edu/Applications/ESMF.shtml#ex4
http://www.ncl.ucar.edu/Applications/ESMF.shtml#ex7
http://www.ncl.ucar.edu/Applications/ESMF.shtml#ex10
http://www.ncl.ucar.edu/Applications/ESMF.shtml#ex15

Finally, we have some ESMF regridding templates at:

http://www.ncl.ucar.edu/Applications/Templates/#ESMFRegriddingTemplates

If you know your data is curvlinear (represented by 2D lat and 2D lon arrays), then
you might want to look at the ESMF_curv_to_1deg.ncl script (it’s easy to change the
“1deg” to “0.5deg”).

Or, if your data is rectilinear, then look at “ESMF_rect_to_5deg.ncl”.

—Mary

On May 20, 2014, at 7:48 AM, George Lavidas <g.lavidas@ed.ac.uk> wrote:

> Hello
>
> I am quite new to the ncl toolbox and I would like to ask a thing
> concerning the regridding options.
>
> I am using CFSR wind data maps that are taken for global scale and would
> like to re-size them into a smaller grid so I can obtain the netCDF
> information only for a specified area and use them for wave simulations.
>
> I previously tried with the CDO toolbox as well to re-build the map to
> my own preferences but that resulted to a "zeroing" of the coordinates
> of the wind files not giving me the correct wind fields to simulate
> As you can see in the attached picture the actual result i got was far
> from the area that wanted the wind components to affect and was limited
> only to a small rectangular area on the upper left corner.
>
> I think I can use some of the scripts from the on the ncl page
> (https://www.ncl.ucar.edu/Applications/concepts_list.shtml)
>
> But I am confused on the process
>
> My task is to remap the grid into a regular one with resolution 720x361
> (or 0.5x0.5 degrees or less) then "trim" the area I want into my desired
> shape and by using a python script I have written extract the wind
> components so i can insert them to my simulation.
>
> Any advice would be helpful, since I am new to large data manipulation
> and extraction.
>
> Thank you very much for your help in advance
> George
>
> --
> George Lavidas
>
>
> The University of Edinburgh is a charitable body, registered in
> Scotland, with registration number SC005336.
>
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Received on Tue May 20 19:22:09 2014