MATLAB: How to create a tiff file from a nx3 matrix

tiff

I have data from an nx3 matrix where column 1 is the x value, column 2 is the y value, and column 3 is an attribute value. Is it possible to create a tiff file using this information? I've been trying to use the Tiff command but I don't think I am setting up tagstruct correctly, because I continue to get errors when I try to write. Thanks.

Best Answer

Let data be your n*3 matrix. 
x = data(:,1) ; 
y = data(:,2) ;
z = data(:,3) ; 
% convert the data to grid 
nx = 500 ; ny = 500 ; 
xi = linspace(min(x),max(x),nx) ; 
yi = linspace(min(y),max(y),ny) ; 
[X,Y] = meshgrid(xi,yi) ; 
Z = griddata(x,y,z,X,Y) ; 
% write to tiff file 
lonmin = min(x); lonmax = max(x); 
latmin = min(y); latmax = max(y);
% Write to geotiff
R = georasterref('RasterSize',size(Z),'LatitudeLimits',[latmin,latmax],'LongitudeLimits',[lonmin,lonmax]);
tiffile = strcat('myFile','.tif') ;
geotiffwrite(tiffile,Z,R)
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