Re: global map of concentration

From: Dave Allured (dave.allured AT noaa.gov)
Date: Fri Jan 14 2005 - 16:45:19 MST

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    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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