MATLAB: Conversion of a vector file into raster

conversion from vector to raster

Hello,
I have a 3 column matrix containing respectively the X, Y and Z coordinates of a riverbed topography. The coordinates are in the CH1903/LV03 geographic coordinate system. I wish to convert this data set into a raster of a 0.5×0.5m cell. The location of the points defining the rivebed is irregular, so I will need to go from this to a square grid in order to be able to map the Z values within the referencing matrix. Can anyone help me on this? Thanks!
Álvaro

Best Answer

Let x,y,z be your column data. 
xi = min(x):0.5:max(x) ; 
yi = min(y):0.5:max(y) ;
[X,Y] = meshgrid(xi,yi) ; 
Z = griddata(x,y,z,X,Y) ; 
pcolor(X,Y,Z) ;
shading interp ;
colorbar
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