I have 500 calibrated magnetometer data values, Distance, Heading direction and a constant speed (with which the data was collected). How to use this data to interpret Magnetic field map of a certain area
Now (based on your data) you could derive a matrix with x, y and field values:
x1,y1,field1
x2,y2,field2
Etc, etc, a total of 500
You could plot that in a 3Dplot. (Not really a Arduino thing, but excel can do that)
You might be able to calculate intermediate values based on surrounding values.
But it is far from straightforward to derive a function like
Field(x y).
That would need 2D fitting of your field data with some adequate function. If there is not too many humps and bumps in your plot, you might get away with something like: field = ax^2 + bx + c + dy^2 + ey + fx^2y^2 + gx^2y + hxy^2 + ixy
But that is already 9 parameters to fit...
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Hi,
What has this to do with Arduino application?
Tom... 
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How to use this data to interpret Magnetic field map
Do you mean "make a map of the magnetic field"? If so, you will need (x,y) coordinates labeled with field strength and direction.
how are the measurements distributed? array? linear? random?
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