comp.lang.idl-pvwave archive: archive » Re: how to calculate distance from pairs of latitude/longitude measurements?

Home » Public Forums » archive » Re: how to calculate distance from pairs of latitude/longitude measurements?

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

Re: how to calculate distance from pairs of latitude/longitude measurements? [message #65608 is a reply to message #65607]

Wed, 11 March 2009 13:21

natha
Messages: 482
Registered: October 2007

Senior Member

I tried the following formula I found in your link:

Distance between points

The great circle distance d between two points with coordinates
{lat1,lon1} and {lat2,lon2} is given by:

d=acos(sin(lat1)*sin(lat2)+cos(lat1)*cos(lat2)*cos(lon1-lon2 ))

A mathematically equivalent formula, which is less subject to rounding
error for short distances is:

d=2*asin(sqrt((sin((lat1-lat2)/2))^2 + cos(lat1)*cos(lat2)*(sin((lon1-
lon2)/2))^2))

the result is 0.8777. 0.8777 distance from montreal to albany ????

Doesn't works !

Report message to a moderator

[Message index]

		Re: how to calculate distance from pairs of latitude/longitude measurements? By: Jeremy Bailin on Thu, 12 March 2009 07:20
		Re: how to calculate distance from pairs of latitude/longitude measurements? By: mankoff on Thu, 12 March 2009 05:02
		Re: how to calculate distance from pairs of latitude/longitude measurements? By: natha on Wed, 11 March 2009 14:12
		Re: how to calculate distance from pairs of latitude/longitude measurements? By: KRDean on Wed, 11 March 2009 13:44
		Re: how to calculate distance from pairs of latitude/longitude measurements? By: David Fanning on Wed, 11 March 2009 13:33
		Re: how to calculate distance from pairs of latitude/longitude measurements? By: natha on Wed, 11 March 2009 13:21
		Re: how to calculate distance from pairs of latitude/longitude measurements? By: Bruce Bowler on Wed, 11 March 2009 13:07
		Re: how to calculate distance from pairs of latitude/longitude measurements? By: natha on Wed, 11 March 2009 12:49

Previous Topic:	Re: OpenADDE and IDL
Next Topic:	Need Help Resolving ENDIF Errors

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sun Nov 30 22:42:57 PST 2025

Total time taken to generate the page: 0.31720 seconds