3D Gravity plot problem - how to differentiate between separate sections of a vector?

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celyn
celyn 2013-2-20
Hi, I am trying to plot a 3D topography profile using gravity data.
I have three vectors: x-coordinates, y-coordinates, topography values.
I have used meshgrid and TriScatteredInterp to generate a a plot but it is messy and I think the reason for this is that I have data for 7 separate survey lines, i.e. the data was collected in 7 straight lines forming a grid.
...so when i have data for 7 lines 'lined up on top of eachother', it interpolates between the beginning of one survey line and the end of another etc.
How do i get MatLab to recognise the 7 separate lines whilst still being able to use meshgrid etc, with 3 vectors to describe x-coord, y-coord and topography data?
Here's my code:
load ne_top_lines_zgrav.txt
E = ne_top_lines_zgrav(:,2);
N = ne_top_lines_zgrav(:,1);
grav = ne_top_lines_zgrav(:,3);
F = TriScatteredInterp(E, N, grav);
[x, y] = meshgrid(E, N);
z= F(x,y);
hold on
surf(x,y,z);
Really appreciate your help!

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