Scattered Interpolation: Defining my own triangulation?

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millercommamatt 2020-9-17

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https://ww2.mathworks.cn/matlabcentral/answers/595459-scattered-interpolation-defining-my-own-triangulation

回答： Noah Prisament 2023-6-12

I'm interpolating data the comes from polar coordiate systems or terrain-following coordiante system used in numerical weather models. While that data isn't gridded in the since that it's not grid aligned, it is structured.

Scattered interpolation is slow. My understanding is that this stems from computing the delaunay triangulation. For my data it would be trivial to provide the triangulation connectivity graph along with the points.

Is there a way I can provide a pre computed triangulation to scatteredInterpolant or griddata in order to speed up my scattered interpolations? Is there some hidden class property I could fill in somewhere?

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John Kearns 2023-6-7

移动：KSSV 2023-6-7

Hey Matt,

Did you manage to find a solution to this? This idea has recently become relevant in my own work, and I would be grateful if you were able to share an successes you've had.

Cheers,

John

millercommamatt 2023-6-7

I don't have any new information to share on this front.

In my case my data had a grid-like connectivity pattern so I transformed my data into a virtural coordinate system that I treated as gridded and used the much faster gridded interpolation and then converted back to my native coordinate system. It's a dirty hack that would get you in a lot of trouble unless you knew exactly what the assumptions, implications, and impacts were.

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Noah Prisament 2023-6-12

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Hi, I work at MathWorks and I wanted to let you all know that we have forwarded this feedback to the relevant team. We will consider this request and it may be included in a future release.