How to subtract a scatterplot object from a polyshape object
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In my app I am defining polyshapes that represent satellite scan regions on Earth. I know how to subtract polyshapes from each other, for example along coastlines. Now I have a set of scatterplots that represent things such as sea ice, that I also need to subtract from the polyshape scan regions, something like this:

The pink represents the satellite scan region, and the blue is the scatterplot. I need to subtract the scatterplot area from the polyshape scan region. I know scatterplots do not have "area" per se, but perhaps we can define a boundary?
Is there a way to convert a scatterplot to a polyshape? I have seen several discussions here on scatterplots, but nothing quite like this situation. The closest I have come is this answer:
Thanks!
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Walter Roberson
2025 年 4 月 8 日
You can retrieve the XData and YData from the scatter plot, and pass the resulting points to boundary or alphaShape to trace around the outside of the set of points. This will give you a refined set of points that you can use to create another polyshape that you can then subtract from the original polyshape.
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Walter Roberson
2025 年 4 月 10 日
Well you could do something like kmeans clustering and select each cluster and boundary() it individually.
... Now you just need a way of automatically determining the correct number of clusters...
その他の回答 (1 件)
peak
2025 年 4 月 1 日
編集済み: Steven Lord
2025 年 4 月 1 日
The scatterplot is shown in blue, while the satellite scan region is shown in pink. The scatterplot area must be subtracted from the polyshape scan region. https://www.mathworks.com/matlabcentral/answers/472879-surface-from-scatter-3-plot
[SL: Removed link that appeared to be unrelated to the question.]
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