comp.lang.idl-pvwave archive: archive

Home » Public Forums » archive » Spherical Harmonics.

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Spherical Harmonics. [message #3956 is a reply to message #3853]

Fri, 14 April 1995 00:00

ahlquist
Messages: 3
Registered: April 1995

Junior Member

James Tappin (sjt@xuna.sr.bham.ac.uk) wrote:
: Does anyone have either of the following:

: 1) A routine to fit (low order) spherical harmonics to data. That is take
: data tabulated at selected latitude & longitude values and return
: spherical harmonic coefficients of the best fit.

I have some old software that may do some of what you want.
It is in Fortran. Check our anonymous ftp site: ftp.met.fsu.edu
(note that ftp is part of the site address).
Check in directory /pub/spherical_harmonics.
(I'm currently working with a grad student on updated software,
but it isn't ready to release yet and probably won't be until fall.)

: or failing that:

: 2) A routine to return the value of a spherical harmonic function of
: given order at a given location?

Version 2 of Numerical Recipes has function plgndr() which computes
the value of an associated Legendre function.
A more complete source would be "spherepack" which is a spherical
harmonics package. It has been a long time since I retrieved
this package, but I believe that it is available by anonymous
ftp at ftp.ucar.edu (ucar = university corporation for
atmospheric research). Check in directory /dsl/catalog
for a list of software packages (dsl = distributed software libraries).
Check the appropriate subdirectory in directory /dsl/lib
for the Fortran source code.

Jon Ahlquist
Dept. of Meteorology
Florida State University
Tallahassee, FL 32306-3034

Report message to a moderator

[Message index]

		Spherical Harmonics. By: sjt on Mon, 10 April 1995 00:00
		Re: Spherical Harmonics. By: ahlquist on Fri, 14 April 1995 00:00
		Re: Spherical Harmonics. By: bowman on Mon, 10 April 1995 00:00
		Re: spherical harmonics By: John C. Wright on Fri, 13 October 2000 00:00
		Re: spherical harmonics By: Peter Thorne on Fri, 13 October 2000 00:00

Previous Topic:	Re: obj graphics fly-thru help
Next Topic:	Re: Contour plots / ps files

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 17:52:28 PDT 2025

Total time taken to generate the page: 0.00258 seconds