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plotting variable on xy axis

Hi,
I would like to know if anyone has successfully plotted temperature (or someother variable) with respect to longitude and latitude. Please can someone give me some hints on how I can accomplish this. My aim is to come up with a contour graph, where the position of a weather station is defined using longitude and latidude, and the data i.e. temperature will then be shown as a contour (presumably using VisAD's contour class). So for every weather station there will be a point on the map, my problem is to specify the location using some sort of array or tuple, also the data needs to be stored about temperature, wind, etc. I have looked at the examples i.e P4_01, P3_0x, etc and tried modifying them to meet my need, but I have done so with little success I know this is not uncommon and has been done before, so I would appreciate it if someone can tell me how I can accomplish my task, or where I should be looking at.

Thanks,
  Jacky
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