Conversion of a vector file into 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 0.5x0.5m 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

Answer 1

[KSSV]

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

[Álvaro Pardo]

Thanks KSSV!

[KSSV]

Thanks is accepting the answer....;)

[Álvaro Pardo]

I have an addition question linked to the previous one:

Is there any function to clip the raster according to an specific shape? Something like inpolygon but for a raster file. Many thanks in advance!

Álvaro

[KSSV]

inpolygon is available in MATLAB right. You can use it.

[Álvaro Pardo]

But it doesn't work to clip a polygon. You can't select only those pixels within an specified polygon. So it isn't targeted for my problem.

[KSSV]

It canbe very much done..show me what have you tried so far.