Actually, looking back at results in my answer, this bilinear is "somewhat" strange (and other interpolation methods are probably useless for the given task). 

pdl> $x = sequence 3,3

pdl> $y = zeroes 5,5

pdl> bilin2d( $x, $y )

pdl> p $y

[
 [  0 0.5   1 1.5   2]
 [1.5   2 2.5   3 3.5]
 [  3 3.5   4 4.5   5]
 [4.5   5 5.5   6 6.5]
 [  6 6.5   7 7.5   8]
]

[download]

That's better now. We can even visualize it with mesh3d [$y].

karthik248, it's not clear what kind of plot do you mean? 3-D? Over-impose some visualization onto a world map? Or just 2-D image with 3 different colors?

In reply to Re^3: Interpolating data using pdl by vr
in thread Interpolating data using pdl by karthik248

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