Kate Preston wrote:
>
> I have (lat, lon, concentration) data and would like to
> plot this in 1x1 boxes on a global map. I would appreciate
> any help with how to go about this.
>
> ... They are on regular 1 degree grid coordinates,
> although not every (lat,lon) has a concentration value.
Kate,
In re-reading your question, it is unclear to me exactly what you mean
by "plot this in 1x1 boxes". Do you want to see a contour map like this:
http://ngwww.ucar.edu/ngdoc/ng4.4/supplements/conpack/cpex07.gif
Or do you want to draw rectangles across the map with numbers printed
inside them? Following is the closest thing I could find in NCAR
Graphics examples; ignore the underlying contour map:
http://ngwww.ucar.edu/ngdoc/ng4.4/supplements/conpack/cpex06.gif
Let's assume that you want a contour map. Then, having the data already
on your desired grid points makes it easy.
First read your data into a rectangular array, with missing values
filled with something appropriate like -999. Then use CONPACK to make a
contour map of your data, then use EZMAP to draw a map of the continents
on top of the contour map.
http://ngwww.ucar.edu/ngdoc/ng4.4/supplements/conpack/
http://ngwww.ucar.edu/ngdoc/ng4.4/supplements/ezmap/
Here is a typical simple global base map. It will take just a little
work to merge the contour generating program with the map program to
make a combined plot:
http://ngwww.ucar.edu/ngdoc/ng4.4/supplements/ezmap/mpex03.gif
Is this what you are looking for?
--Dave A.
CDC/NOAA/CIRES
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