matlab - How can I calculate curvature of each point on a surface? -

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i have point cloud , first draw surface of these points using matlab(by centering of points). points have 3d coordinates including (x,y,z). original of points same:

    32512035.2100000    5401399.57000000    346.880000000000 32512044.0300000    5401399.54000000    346.850000000000 32512046.8900000    5401399.55000000    346.780000000000 32512049.7800000    5401399.53000000    346.860000000000 32512052.6900000    5401399.53000000    346.700000000000 32512054.0300000    5401399.53000000    346.780000000000 32512055.6900000    5401399.57000000    346.810000000000 32512063.1200000    5401399.54000000    347.800000000000 32512074.2300000    5401399.55000000    346.440000000000 32512093.1200000    5401399.54000000    346.660000000000

and centering of them are: 

-28.7291900003911   -3.97948997747153   -0.700859999999409 -19.9091900000931   -4.00948997773230   -0.730859999999382 -17.0491900006891   -3.99948997795582   -0.800859999999432 -14.1591900000931   -4.01948997750878   -0.720859999999391 -11.2491899999441   -4.01948997750878   -0.880859999999416 -9.90919000009308   -4.01948997750878   -0.800859999999432 -8.24918999994407   -3.97948997747153   -0.770859999999402 -0.819190000242088  -4.00948997773230   0.219140000000607 10.2908099991619    -3.99948997795582   -1.14085999999941 29.1808099997579    -4.00948997773230   -0.920859999999379

and draw surface using fit formula in matlab.

i want calculate curvature of each point , try here , here can't understand "the inputs (x,y,z) 2d arrays corresponding surface being analyzed." thing. me? or tell me how can calculate curvature?

enter image description here


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