Re: [R] gaussian model of 3d surface

From: Martin Maechler <maechler_at_stat.math.ethz.ch>
Date: Sun 25 Jul 2004 - 00:41:03 EST

>>>>> "Alan" == Alan Swanson <swanson@yellowstoneresearch.org>
>>>>> on Fri, 23 Jul 2004 10:35:08 -0600 writes:

    Alan> Hi all, I'm working with radar remote sensing data and
    Alan> want to measure the height of 3d spikes created by
    Alan> backscatter from bright objects.  My thought is to fit
    Alan> a gaussian density function to each spike and extract
    Alan> the x, y and z location of the peak.  Can anybody give
    Alan> me a hint of how to do this?

If I understand correctly,
you want to fit what is commonly called a "(finite) Normal Mixture Model" to your 3d data
and then extract the (estimated) (3d-)means of each component ?

If yes, then consider using package 'mclust'.

Regards,
Martin Maechler



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