[gradsusr] interpolating data to a regular grid

[Jeff Duda]

If the collect and collect2gr() functions don't give you the result you
want (I suspect they will not) you might have to use Fortran or some other
programming language to create a gridded field using a Cressman/Barnes or
some other scheme (even bilinear, bicubic, or inverse distance weighted
interpolation schemes could work, too).

Jeff Duda


On Thu, Jul 24, 2014 at 2:31 PM, Zilore Mumba <zmumba at gmail.com> wrote:

> Dear Grads Users,
> I have station rainfall data which I want to draw contours. I have
> searched previous posts on regridding data to a regular grid, but am not
> sure if the suggested solutions are relevant to my case, or whether what am
> trying to do is possible. When I write the data in binary as longitude,
> latitude, value the display is very strange. I can write it as station
> values and display as in the file attached.
> What I want to be able to do is to interpolate between stations and draw
> contours.
> My data looks as follows:
> 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
> The longitudes are sorted from smallest (western most) to largest, but
> obviously it is not possible to sort latitudes.
> Below is the ctl I wrote to display the data written as lon, lat value
> (without the id number)
> DSET      means.grd
> TITLE     Sample Data Set
> UNDEF    -9.99E33
> XDEF     11 LINEAR 28.9 .2
> YDEF     11 LINEAR -2.6 .1
> ZDEF      1 LINEAR 1 1
> TDEF      1 LINEAR 1JAN2000 1DY
> VARS      1
> r  0  99  rainfall
> ENDVARS
>
> Is it possible to do what I want to do?
> Help will be appreciated
> Zilore
>
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>


-- 
Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms
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