comp.lang.idl-pvwave archive: archive » Re: CALCULATION OF AREA ON A SPHERE

Home » Public Forums » archive » Re: CALCULATION OF AREA ON A SPHERE

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

Re: CALCULATION OF AREA ON A SPHERE [message #19049]

Wed, 23 February 2000 00:00

Ben Tupper
Messages: 186
Registered: August 1999

Senior Member

Kyong-Hwan Seo wrote:

> I am looking for a way to calculate area on sphere.
> I have arrays of the position of the connected points (i.e, longitudes
> and latitudes).
>

Hello,

The following may be helpful if you have only three verticies enclosing
the area.

This is from Bronshtein and Semendyayev, A GUIDE BOOK TO MATHEMATICS,
Springer-Verlag, 1973.

"A fundamental property of a spherical triangle is that the sum of its
angles A+B+C is always greater than 180 degrees. The difference, (A+B+C)
- pi= delta , expressed in radians is called the spherical excess of the
given spherical triangle. The area of a spherical triangle is S=R^2 *
delta, where R is the radius of the sphere."

Ben

--
Ben Tupper

Bigelow Laboratory for Ocean Science
tupper@seadas.bigelow.org

pemaquidriver@tidewater.net

Report message to a moderator

[Message index]

		Re: CALCULATION OF AREA ON A SPHERE By: Ben Tupper on Wed, 23 February 2000 00:00
		Re: CALCULATION OF AREA ON A SPHERE By: davidf on Tue, 22 February 2000 00:00
		Re: CALCULATION OF AREA ON A SPHERE By: Craig Markwardt on Tue, 22 February 2000 00:00
		Re: CALCULATION OF AREA ON A SPHERE By: Med Bennett on Tue, 22 February 2000 00:00
		Re: CALCULATION OF AREA ON A SPHERE By: Tim Cross on Thu, 24 February 2000 00:00
		Re: CALCULATION OF AREA ON A SPHERE By: Tim Cross on Mon, 28 February 2000 00:00
		Re: CALCULATION OF AREA ON A SPHERE By: Stein Vidar Hagfors H[1] on Mon, 28 February 2000 00:00
		Re: CALCULATION OF AREA ON A SPHERE By: James Kuyper on Thu, 23 March 2000 00:00

Previous Topic:	Object graphic 3d Scatterplot
Next Topic:	Q: contour levels from IDL

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 18:06:38 PDT 2025

Total time taken to generate the page: 0.07835 seconds