3D Surface Plot With Only Vectors
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I'm trying to make surface plots based on data from a satellite. All of the standard surface functions ('surface', 'contour', 'pcolor', etc.) require one of the fields to be a matrix, but the data I'm trying to plot is all in vectors. For instance, I have vectors for latitude and longitude of each reading, then a vector of the elevation read at each point. And the vectors are of considerable length, so I'm trying to use as little memory as possible for each plot.
'plot3(Lon, Lat, Elev)' almost gives me what I need, except I still can't put a detailed colormap to the elevation data. Ideally, I want to be able to look at the x-y plane and easily see the changes in elevation with the help of the colorbar.
Any ideas on a better function to use? Or is there a way to somehow get my elevation data into a matrix that doesn't give me a large, sparse matrix?
Fangjun Jiang on 18 Aug 2011
This should work. Adjust the CircleSize for better result. See scatter3() for more options.
Patrick Kalita on 8 Sep 2011
Have you looked at trisurf?
The idea is that you first need to compute a triangulation of the (lat, lon) coordinates. The function delaunay will work fine. Then you can pass that along with the coordinate vectors to trisurf. Here's an example:
% make up some data
lat = rand(1,300)*6 - 3;
lon = rand(1,300)*4 - 2;
elev = peaks(lat, lon);
% triangulate and plot
tri = delaunay(lat, lon);
trisurf(tri, lat, lon, elev);
% optional, could help make the plot look nicer