Possible to contour at specific z planes to give the x,y coords?

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Wthee 2020-9-23

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关闭： MATLAB Answer Bot 2021-8-20

Here's a followup from a previous question... https://www.mathworks.com/matlabcentral/answers/596671-converting-gridded-elevation-data-and-x-y-coords-into-row-output

Given these vectors:

We are dealing with UTM coords here, and we have: Northings, Eastings, and gridded Elevation-values.

dimensions--

x is 1x30

y is 1x41

z is 41x30

and Given this code:

[X,Y]=meshgrid(x,y);%assume this is what you want
dataTemp=[X(:),Y(:),z(:)];
data = rmmissing(dataTemp)

The Followup question:

Is there a way to have contour outputs at certain z values? E.g., somehow setting z = 0 and finding all x,y coords that intersect that plane? I'm guessing there would have to be interpolation involved?

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KSSV 2020-9-24

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You can use contour to do this. You need to specify the level as 0 to get your coordinates (x,y) where Z = 0.

C = contour(X,Y,Z,[0 0]) ;

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Wthee 2020-10-1

That level of resolution isn't necessary.

I'm really just trying to see if griddata can solve my issue as there are many gaps for z values. I would like to have x and y interpolated for z at possible intervals of .1 or .01. from a bit above the surface to typical fault depth.

I don't know if I have presented to case well enough for you to be able to help.

Thanks for the efforts so far.

Walter Roberson 2020-10-1

contour3 and provide the level list. The graphics objects that result will have ZData properties corresponding to the z level; regular contour() sets the ZData to 0. XData and YData coordinates give you the edges.

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