comp.lang.idl-pvwave archive: archive » Re: Finding distance with longitude and latitude

Home » Public Forums » archive » Re: Finding distance with longitude and latitude

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

Re: Finding distance with longitude and latitude [message #83987 is a reply to message #83986]

Sun, 14 April 2013 16:45

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Sunday, April 14, 2013 7:22:44 PM UTC-4, gpet...@ucsc.edu wrote:

> a=sqrt((cos(lat2)*sin(dlon))^2 + (cos(lat1)*sin(lat2)-sin(lat1)*cos(lat2)*cos(dlon))^2)/(sin( lat1)*sin(lat2)+cos(lat1)*cos(lat2)*cos(dlat))

c= atan(a)

The Wikipedia article you quote says
"When programming a computer, one should use the atan2() function rather than the ordinary arctangent function (atan()), in order to simplify handling of the case where the denominator is zero, and to compute \Delta\widehat{\sigma}\;\! unambiguously in all quadrants"

Report message to a moderator

[Message index]

		Re: Finding distance with longitude and latitude By: David Fanning on Tue, 16 April 2013 09:23
		Re: Finding distance with longitude and latitude By: gpeterso on Tue, 16 April 2013 08:46
		Re: Finding distance with longitude and latitude By: seanelvidge on Mon, 15 April 2013 04:13
		Re: Finding distance with longitude and latitude By: wlandsman on Sun, 14 April 2013 19:38
		Re: Finding distance with longitude and latitude By: gpeterso on Sun, 14 April 2013 18:17
		Re: Finding distance with longitude and latitude By: David Fanning on Sun, 14 April 2013 16:57
		Re: Finding distance with longitude and latitude By: wlandsman on Sun, 14 April 2013 16:49
		Re: Finding distance with longitude and latitude By: wlandsman on Sun, 14 April 2013 16:45

Previous Topic:	How can I export a few million geocoded points from IDL to ArcMap?
Next Topic:	Cubic root finding on a grid

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Thu Oct 09 22:25:41 PDT 2025

Total time taken to generate the page: 0.72132 seconds