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 Post subject: General question - 2D & 3D interpolation
PostPosted: Tue Sep 19, 2017 8:13 am 
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Joined: Tue Sep 19, 2017 7:40 am
Posts: 1
Hi Alglib

A general question. We are looking for a library to interpolate point values in 3D space to a 2D surfaces (X,Y,Z) . Like a digital elevation model, generated from a series of point measurements.

Are there functionalities for this in ALGLIB?

Which types of interpolation rutines would you suggest?

We are currently using IDW and Kriging to generate 2D surfaces, but are looking for a set of more flexible, robust and fast interpolators to offer to our customers.

Please advice

Thank you for providing a fantastic library - and thank you for the release of the new Delphi versio - we wil llook into this :-)

Best
Torben


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 Post subject: Re: General question - 2D & 3D interpolation
PostPosted: Tue Sep 19, 2017 1:06 pm 
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Joined: Fri May 07, 2010 7:06 am
Posts: 779
Hi!

Yes, ALGLIB has such functionality - hierarchical RBFs. It supports both modelling Z(x,y) and F(x,y,z). You should use rbf subpackage - http://www.alglib.net/translator/man/manual.delphi.html#unit_rbf - and activate/tweak HRBF algorithm with rbfsetalgohierarchical() function.

NOTE: from your words I assume that you want to use Delphi version :) if you want to use C++ or C#, replace "delphi" in URL with "cpp" or "csharp" for appropriate manual file.

NOTE 2: if you want, you can write to me - sergey.bochkanov at alglib.net - and I can help you to tune HRBFs to your specific task. The most important points are: typical number of points, spatial extent (in meters) and typical search radius (in meters).


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