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*Subject*: Re: CALCULATION OF AREA ON A SPHERE*From*: Craig Markwardt <craigmnet(at)cow.physics.wisc.edu>*Date*: 22 Feb 2000 20:48:56 -0600*Newsgroups*: comp.lang.idl-pvwave*Organization*: U. Wisc. Madison Physics -- Compact Objects*References*: <38ADA7B0.26FF8DC4@csrp.tamu.edu> <38B309AD.C010367C@indra.com>*Reply-To*: craigmnet(at)cow.physics.wisc.edu*Xref*: news.doit.wisc.edu comp.lang.idl-pvwave:18564

Med Bennett <mbennett@indra.com> writes: > This is an interesting problem and I was hoping that someone would have > provided a slick answer by now. I started searching the Web and came up > with the following. It seems as though you could triangulate your points > and then use the theorem presented below: > [ ... deleted ... ] This was discussed a little bit in August 1999 (see "area enclosed by a polygon on a sphere" on www.deja.com). The tricky part of course is computing the correct angles. Struan Gray wondered if there was a utility routine in the idlastro library which could help. Try GCIRC of idlastro, but also these two from the "JHU/APL/S1R usr Library". SPHGC Find intersections of two great circles on sphere. SPHIC Compute intersection points of two circles on a unit sphere. I found these here: http://www.astro.washington.edu/deutsch/idl/ Craig P.S. A little research is all it takes! -- -------------------------------------------------------------------------- Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response --------------------------------------------------------------------------

**Follow-Ups**:**Re: CALCULATION OF AREA ON A SPHERE***From:*David Fanning

**References**:**CALCULATION OF AREA ON A SPHERE***From:*Kyong-Hwan Seo

**Re: CALCULATION OF AREA ON A SPHERE***From:*Med Bennett

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