[R] 3D-plots of 2D-grids

[jas]

Hello David,
thanks again for your reply.

Two things remain unclear. That the data is disjointed is ok, as there are
only values in hectares, where there are actually buildings and stuff,
forest/nature is NA. 

The presp-scan that I get from persp(grd) has no similarity to the image in
2d. My guess is that the order and regularity in the data somehow gets lost
in the process of making the matrix?! 

The grid-extraction that I uploaded contains 40x20 cells. if its a bigger
grid with 7million cells, does it still work the same way or can the vectors
only be a maximum of 100 cells? 
 
Thank you for your help
jas



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