[ncl-talk] Regridding irregularly spaced data onto a regular grid

[Dave Allured - NOAA Affiliate]

Zilore,

Please look at the first example on the Station Data example page:
http://www.ncl.ucar.edu/Applications/station.shtml

You said that you wanted to plot contours.  This simple example plots
contours WITHOUT first putting data on a regular grid.  It uses a
triangular mesh plotting technique.  For irregular coordinates, this
technique will actually make a more accurate contour map than one made from
a regular grid.

Will this example meet your needs?  My apologies if this was already
discussed previously.

--Dave


On Sat, Jul 26, 2014 at 4:40 PM, zilore mumba <zmumba at yahoo.com> wrote:

> I have x,y,z data on an irregularly spaced geographical grid, which I want
> to put on a regular grid to be able to plot contours.
> My data is below (id, long., lat., rainfall).
> 01  28.92  -2.47  286.5
> 02  29.02  -2.68  168.8
> 03  29.25  -1.67  243.4
> 04  29.42  -2.07  204.9
> 05  29.55  -1.58  286.9
> 06  29.57  -2.48  230.
> 07  29.6   -1.5   177.5
> 08  29.72  -2.18  290.
> 09  30.05  -1.6   206.5
> 10  30.13  -1.97  178.1
> 11  30.5   -2.15  156.7
> My sincere apologies because this is a question I already asked more than
> 6 months ago and I still have not found a solution.
> The question is: Is it possible to do what I want to do in ncl?
> 1. I have tried 2dgrid.ncl which seems to but am not able to figure out
> how to write output to file, and the z values all seem to be above 370
> (well above what I have in my file).
> 2. I have try the Fortran single precision linear interpolation at Natgrid
> Examples <http://w3.pppl.gov/ngdoc/ng/ngmath/natgrid/examples.html> and
> run the fortran program with ncargf77 filename I get the errors below:
> Advice will be appreciated.
>
> ncargf77 natgrid.f
> gfortran -fPIC -fno-second-underscore -fno-range-check -fopenmp -O
> natgrid.f -L/usr/local/lib -L/usr/X11R6/lib64 -lncarg -lncarg_gks -lncarg_c
> -lX11 -lXext -lcairo -lfontconfig -lpixman-1 -lfreetype -lexpat -lpng -lz
> -liconv -lXrender -lbz2
> /usr/bin/ld: cannot find -lX11
> /usr/bin/ld: cannot find -lXext
> /usr/bin/ld: cannot find -lcairo
> /usr/bin/ld: cannot find -lfontconfig
> /usr/bin/ld: cannot find -lpixman-1
> /usr/bin/ld: cannot find -lfreetype
> /usr/bin/ld: cannot find -lexpat
> /usr/bin/ld: cannot find -liconv
> /usr/bin/ld: cannot find -lXrender
> /usr/bin/ld: cannot find -lbz2
> collect2: error: ld returned 1 exit status
>
>
>
>
>
>
>
> Natgrid Examples
> <http://w3.pppl.gov/ngdoc/ng/ngmath/natgrid/examples.html>
> Natgrid examples Overview This module contains source codes for all of the
> examples referenced by the other modules in the documentation. Links to all
> of the example plots are provided.
> View on w3.pppl.gov
> <http://w3.pppl.gov/ngdoc/ng/ngmath/natgrid/examples.html>
> Preview by Yahoo
>
>
>
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