Matlab: using linterp to interpolate beach contours

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SUMMARY

This discussion focuses on using Matlab's linterp function for interpolating beach contours, specifically addressing the challenge of identifying the seaward most contour when multiple occurrences exist. The user initially faced issues with linterp prioritizing the landward contour due to its sorting mechanism. A successful workaround was implemented using the curveintersect function, which resolved the interpolation issue effectively.

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rocks rock
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Hi,

I am trying to create a plot of how certain elevation contours on a beach change over time. I have been using linterp for this so far. I want to interpolate a cross-shore (from dune to shoreline) position for a certain elevation from my data.

The issue I'm having is that when there is more than 1 occurrence of a particular contour on a particular profile linterp is picking up the landward most contour, but I want to know the location of the seaward most contour.

Any thoughts on a work around or another method of interpolation?

It was suggested to me that I try interp2, but I'm having trouble figuring out how to use that.

Thanks
 
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What's the nature of the data you're linterping, does it report the xyz of points along the surface? Do you encode this in a 3d matrix?
 
The data is a series of x and z points (y is assumed the same at all locations).

I think the problem was that linterp was sorting the data based on z before interpolating and we wanted to keep them in order by x.

Now using curveintersect, and it works!
 

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