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I am having some serious trouble finding a solution to fit my current needs. I am attempting to create contour maps from irregularly spaced point-data on the fly to overlay on a Google map. I have looked at almost everything I can find, but I haven't come across anything that seemed to do this. I cannot generate the contours before use, as there are literally thousands of possible maps, and they change regularly. If anyone knows of anything that might help me accomplish this, it would be extremely helpful.

EDIT: I am fairly new to all of this stuff, so there is a good chance I have missed something basic. Please let me know if that is the case.

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Just to be clear, are you capable of generating the contours yourself, or do you need guidance on this as well? How often does data change? Some weather bureau did this in the UK a while ago, but I'm having a hard time finding the info. –  nagytech Jul 24 '12 at 21:17
    
I don't know how to generate them myself, but I have no problem with learning to if needed- I just need to be pointed in the right direction. The data can change at 15 minute intervals, but realistically it will only be altered over the course of a few days once or twice a year- I am working at mapping yield data collected by grain harvesters in the field. –  Crash Jul 24 '12 at 21:42
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In what sense are these maps really "dynamic"? Sure, they cover the same circle each time, but don't you generate exactly one map per harvest, from a harvest-specific collection of locations? As such, each new map has little to do with the previous one. A truly dynamic map, on the other hand, might retain the same sample points but change their values. The distinction is crucial, because one can set up an extremely efficient contouring algorithm in advance based on the point locations only, and then just plug in the values as they are received. –  whuber Jul 24 '12 at 22:01
    
@Crash See if gheat is what you're after. –  nagytech Jul 24 '12 at 22:11
    
@whuber you're right, this isn't dynamic- I didn't really understand the distinction. –  Crash Jul 25 '12 at 14:22

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