How to grid xyz data without interpolation
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I have a Digital Elevation Model (DEM) was provided as a list of x, y, z coordinates (x and y are 1 x N sized vectors). I would like to grid the so that I can view z as an N x N matrix, but I do NOT want to perform any interpolation on the surface described by z. It appears that the MATLAB 'griddata' function does not allow you to grid a dataset without interpolation. Is there any function that simply allows my to put this xyz data into a grid of z with dimensions along x and y?
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Walter Roberson
le 22 Mai 2015
If you are trying to create an N x N matrix out of a 1 x N vector then it will only be fractionally populated (1 out of N), and you have not defined what you want to go into the empty places.
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Walter Roberson
le 22 Mai 2015
If the purpose is just visual presentation then scatter() might be what you are looking for.
John D'Errico
le 22 Mai 2015
If you only have a set of points that do not lie on a regular grid, BUT you require a gridded set of points, this is IMPOSSIBLE to solve without interpolation of some sort.
Wanting magic to happen will not suffice, unless of course, your name is Harry Potter. I don't recall any mathematics classes offered at Hogwarts.
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