I am working with some antarctic DEM data in Matlab. So, far I have been able to generate a nice looking mesh, with the following basic code:
load (Data.xyz)
X = Data(:,1);
Y = Data(:,2);
Z = Data(:,3);
xr = unique(X);
yr = unique(Y);
gz = zeros(length(yr),length(xr));
gz = griddata(X,Y,Z,xr,yr');
figure
mesh(xr,yr,gz);
hold on
contour3(xr,yr,gz,'k-');
hold off
Now I have a few questions, which I have not been able to answer despite being at it since past couple of days and looking at all forums and googling day and night. I hope you all experts might be able to suggest me something. My questions are:
1. The above code takes a lot of time. Agreed that the DEM for antarctica is large sized and slow response time for a code does not necessarily mean that its incorrect. However, I am totally unable to run this code on my laptop (2.5 GHz/4GB) - its so slow. I am wondering if there are other ways to generate mesh which are faster and more efficient.
2. The second issue is that the above "Data.xyz" contains DEM data from all antarctica. After generating a mesh, I want to clip it based on locations. Say, for e.g., I want to extract mesh data for area bound by x1,y1, x2,y2, x3, y3, and x4,y4. How do I go about doing that? I could not find a suitable function or tool or any user script anywhere which will allow me to do so. Is it possible to cut a mesh in matlab?
I am running Matlab 2012a, and I do not have access to mapping toolbox. Any suggestions???
