Lat / Long and Elevation Data - Seabed survey - Surface Plot

Question

scour_man 2011-3-10

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https://ww2.mathworks.cn/matlabcentral/answers/2922-lat-long-and-elevation-data-seabed-survey-surface-plot

I have data from a seabed survey in Excel format - 3 columns, the first one contains the Eastings, the second contains the Northing and the third column contains the corresponding elevation in metres. I would like to create a suface plot in Matlab but I believe I first need to somehow arrange the data into matrix form?

Any help would be much appreciated! Thanks

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Answer 1

Matt Tearle 2011-3-10

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https://ww2.mathworks.cn/matlabcentral/answers/2922-lat-long-and-elevation-data-seabed-survey-surface-plot#answer_4487

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This seems to be the question du jour. If the data is actually on a grid, you should just be able to reshape your vectors into matrices. If not:

% Make some fake vector data
x = rand(100,1)*4-2;
y = rand(100,1)*4-2;
z = x.*exp(-x.^2-y.^2);
% Put data onto a grid
[qx,qy] = meshgrid(linspace(min(x),max(x)),linspace(min(y),max(y)));
F = TriScatteredInterp(x,y,z);
qz = F(qx,qy);

Either way, once in matrix form

surf(qx,qy,qz)