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Re: Distance between coordinates [message #90944 is a reply to message #90943]

Sun, 17 May 2015 20:28

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Saturday, May 16, 2015 at 8:23:49 PM UTC-4, astr...@gmail.com wrote:
> Hello Michael I have a problem in Code regard to gcirc.pro, It gave me incorrect of argument through IDL programme, How can I solve that?

We can't tell you what you are doing wrong if we don't know what you are doing. You need to show us how you are calling gcirc.pro ( not a standard IDL procedure but in the IDL Astronomy library http://idlastro.gsfc.nasa.gov/ftp/pro/astro/gcirc.pro )

But here is how to get the same result as the example in the MAP_2POINTS documentation, the angular distance between Boulder and London.

B = [ -105.19, 40.02] ;Boulder Longitude, latitude in degrees.
L = [ -0.07, 51.30] ;London Longitude, latitude in degrees.

IDL> gcirc,2,b[0],b[1],l[0],l[1],dis

where we set the units (first) parameter to 2 ( RAx and DCx in degrees, DIS in arc seconds)

so the angular distance between Boulder and London in arc seconds and degrees is
IDL> print,dis,dis/3600.
244275.60 67.854333

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[Message index]

		Distance between coordinates By: khyde on Thu, 14 May 2015 13:57
		Re: Distance between coordinates By: Michael Galloy on Thu, 14 May 2015 16:16
		Re: Distance between coordinates By: khyde on Fri, 15 May 2015 06:02
		Re: Distance between coordinates By: astr74323 on Sat, 16 May 2015 17:23
		Re: Distance between coordinates By: wlandsman on Sun, 17 May 2015 20:28
		Re: Distance between coordinates By: astr74323 on Mon, 18 May 2015 11:49
		Re: Distance between coordinates By: wlandsman on Mon, 18 May 2015 12:51
		Re: Distance between coordinates By: astr74323 on Mon, 18 May 2015 14:42
		Re: Distance between coordinates By: astr74323 on Mon, 18 May 2015 14:48
		Re: Distance between coordinates By: David Fanning on Mon, 18 May 2015 16:39
		Re: Distance between coordinates By: wlandsman on Mon, 18 May 2015 17:08

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