How can I use the inpolygon function for 3 dimensions?

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Candice Cooper 2021-6-28

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编辑： Walter Roberson 2021-6-28

I have plotted the chlorophyll monthly climatology of a specific region of a world map. I want to place a polygon on a specific region and plot time series for just that region. The chlorophyll data is in 3 dimensions of longitude, latitude, and dates (109x97x280). I'm confused on how to use the inpolygon function for 3 dimensions. I want to be able to make the polygon, determine which points are within that polygon, then average those points for each date to ultimately plot a time series. Any suggestions are helpful, thank you!

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DGM 2021-6-28

编辑：DGM 2021-6-28

It sounds to me like your constraint region isn't a polygon, but a polygonal prism. To clarify, what is the time range? Is it a single specific time? Is it a range of times? Is it all time? It sounds like it's one of the latter two.

Candice Cooper 2021-6-28

Yes, that's correct I believe. It's a range of times (spanning 23 years).

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KSSV 2021-6-28

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You need not to use a 3D inpolygon. You are supposed to use inpolygon only once. Get your closed polygon coordinates(xv,yv); let X, Y be your grid coordinates.

idx = inpolygon(X,Y,xv,yv) ;

You got the indices, the same indices can be used for all the time steps.