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Topic: how to find a 2-D function Z(x,y) to fit data
Replies: 4   Last Post: Aug 23, 2013 1:19 PM

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mxfong2012@gmail.com

Posts: 3
Registered: 8/21/13
how to find a 2-D function Z(x,y) to fit data
Posted: Aug 21, 2013 2:39 PM
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I have a difficulty in finding a 2-D function, Z(x,y), to fit data, where x is latitude, y is altitude, and z is a physical parameter.

An example of the data is shown at
https://docs.google.com/file/d/0B9P_kUabfW3WMzctUFNydTFlNW8/edit?usp=sharing

I have lots of such 2-D data and I would like to parameterize them, i.e., fit the data using a simple function with appropriately determined parameters.

Specifically, I have to know what function(s) (as simple as possible) can produce such a shape so that I can continue to do a 2-D curve fitting. But I have no idea of how to find such a function.

P.S. Lagrange polynomial does not meet my needs.

thanks in advance for any suggestions!





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