Reducing Density in Geographical Data

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Noah Gilbert
Noah Gilbert 2019-4-27
回答： lvn 2019-10-9
Hello,
I have a set of data, organized into four matrices (Length, Elevation, Latitude, Longitude). I am able to reduce the density of the latitude and longitude data using reducem, but I would like to apply the same filter to the length and elevation information so that the relations between each entry are preserved.

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lvn
lvn 2019-10-9
You first have to get the indices of which elements are preserved. With those you can construct new elevation, and length vectors. Something like this:
[lat2,lon2] = reducem(lat,lon);
[~,idx] = intersect(lat,lat2,'stable');
elevation2=elevation(idx);
length2=length(idx);

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