[ncl-talk] Regridding

[Dennis Shea]

The *rgrid2geocircle*
<https://www.ncl.ucar.edu/Applications/Scripts/grid2geocircle.ncl> function
uses *nggcog*
<https://www.ncl.ucar.edu/Document/Functions/Built-in/nggcog.shtml> to
approximate the 'circle' around a given location. Degrees of latitude are
the units.
 *css2c* <https://www.ncl.ucar.edu/Document/Functions/Built-in/css2c.shtml>
is used to translate the geocircle latitude(s) and longitude(s) to
Cartesian coordinates;

When circular lat/lon are translated to/from spherical  coordinates to
cartesian coordin, I speculate there is some distortion. ALso, the map
projection can affect the 'look.'


On Sat, Jun 27, 2020 at 7:58 AM Md. Jalal Uddin via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Hi all,
>
> I produced two figures: one following the regrid_15 example and another
> one following regrid_17 (
> https://www.ncl.ucar.edu/Applications/regrid.shtml). I got a round figure
> from the regrid_15 example, while regrid_17 produced a bit different (oval)
> - the figures have attached herewith.
>
> https://www.ncl.ucar.edu/Applications/Scripts/regrid_15_regcm.ncl
> https://www.ncl.ucar.edu/Applications/Scripts/regrid_17.ncl
>
> Data link:
> Rainfall data (
> https://drive.google.com/file/d/1G3F2NxDasygsCMyVB2x0UoWH_hPxODWm/view?usp=sharing
> )
>
> cyclone track data:
> https://drive.google.com/file/d/1VwfPeIcNnauffdMulkh9UzUqBJS2Ad4M/view?usp=sharing
>
> Any suggestions?
>
> Best regards,
> Jalal
> --
> *Md. Jalal Uddin*
> M.Sc. in Applied Meteorology
> Nanjing University of Information, Science and Technology, China.
> B.Sc. in Disaster Management (Hons.)
> Patuakhali Science and Technology University, Bangladesh.
> Cell: +8613260859092, +8801792052662
> Web: www.dmjalal90.weebly.com
> Researchgate: https://www.researchgate.net/profile/Md_Uddin125
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