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*Subject*: spherical harmonics*From*: Klaus Gottschaldt <klgo(at)geo.uni-jena.de>*Date*: Fri, 13 Oct 2000 09:44:22 +0200*Newsgroups*: comp.lang.idl-pvwave*Organization*: Friedrich-Schiller-University Jena, Germany*Xref*: news.doit.wisc.edu comp.lang.idl-pvwave:21690

Hallo! I want to analyze data on a sphere, representing them by spherical harmonic coefficients. This is somehow like a Fourier transform, but based on Legendre polynoms, which are defined on the surface of a sphere. Unlike wavelets, this transform is global. My data are given in the form [longitude, latitude, data_value], where longitude, latitude and data_value are vectors of the same length. Data points are randomly scattered over the sphere with a resolution of approx. 100km on the Earth's surface. Does somebody know, how to do this transform with idl? Klaus

**Follow-Ups**:**Re: spherical harmonics***From:*Peter Thorne

**Re: spherical harmonics***From:*John C. Wright

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