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Re: Finding distance with longitude and latitude [message #83960]

Tue, 16 April 2013 09:23

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

gpeterso@ucsc.edu writes:

> Thanks david, would you have any idea how to use the newfound distance to then graph the contour profile with?

Well, to be honest, I don't think I care about the distance at all if
"graphing" the contour profile is what I am after. Maybe I would use it
to label the graph.

I would probably display the great circle distance on the map by just
putting the profile on the map with cgPlotS, using the latitude and
longitude values you calculated, perhaps color coded with elevation
values. If I wanted to show more detail, I might add a plot of the
contour values at your profile locations just above the map.

I would also never write this program so that it has to use the Cursor
command. I'd write it as a widget program. This would make things *so
much* easier when you wanted to display the map and the contour profile
together in the same window. You could toggle between the map and the
map with contour profile, allow the user to draw multiple contour
profiles, and just generally have a LOT more control over what is
happening in your program. :-)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[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

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