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From: Alexandre Carvalho Leite on 21 Apr 2010 18:51
Hi John,

I am looking for something similar. I´ve found this link: http://www.cgl.uwaterloo.ca/~smann/HPindex/matlab.html

But I don´t ran the scripts. Please, let me know if you found something by yourself, this is also important for me and I wouldn´t like to code it.

alexandre.carvalholeite(a)dlr.de

Best regards,
Alexandre

John Townend <jtownend(a)pangea.stanford.edu> wrote in message <Pine.OSF.4.33.0105171116510.7713-100000(a)pangea.Stanford.EDU>...
> Hi there,
>
> I've recently been working with the quadtree recursive gridding algorithm
> to subdivide a heterogeneous set of point data (earthquake epicenters)
> into boxes. The algorithm works by recursively subdividing into quarters
> a square containing all the data. It continues subdividing each quarter
> until each box contains fewer than a certain number of epicenters, or
> until some maximum resolution limit has been reached.
>
> The benefit of this approach to grouping the earthquakes is that the
> resolution of the grouping depends on the local density of data, rather
> than a uniform resolution which under- or over-utilizes data from
> different areas.
>
> What I'd like to try is gridding data in three dimensions (earthquake
> hypocenters) using the 3D version of this algorithm, referred to as
> octree. Does anyone out there know of a Matlab implementation of octree
> for use with point data? Most of the algorithms I've been able to find
> are designed for use in meshing solid bodies, and the recursion criterion
> is not appropriate for my purposes.
>
> I'd appreciate any suggestions!
> John.
>
> John Townend
> Department of Geophysics
> Stanford, CA 94305-2215
>
> jtownend(a)stanford.edu
> ph. +1 (650) 723 9831
> fax. +1 (650) 725 7344
>
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