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Plot curved line on a globe projection [message #85346]

Sun, 28 July 2013 11:19

Sir Loin Steak
Messages: 42
Registered: January 2012

Member

Hi all,

I want to plot some straight line sections on a gridded globe plot (i.e. a line joining two points with different lat/lon coordinates), but want these lines to follow the curve of the globe.

I did a test (which I thought would work!) using the following code, but it just plots a straight line:

;Coordinates etc
latcentre = 30
loncentre = 0
angle = 0

;Plot globe
set_plot, 'ps'
!p.font=0
device, /encap, xsize=6, ysize=6, /inches
loadct, 0
map_set, latcentre, loncentre, angle, $
/orthographic, /isotropic, /grid, /horizon, /noborder
map_grid, latdel=5, londel=5, glinestyle=0, glinethick=0.5, color=cgcolor('black')
oplot, [10,30], [30,50], color=cgcolor('black')
device, /close

Can anyone offer any help? Is there anything simple I'm missing? I've searched online, but only seem to be able to find posts related to contouring on globe plots.

Many thanks,

Liam

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[Message index]

		Plot curved line on a globe projection By: Sir Loin Steak on Sun, 28 July 2013 11:19
		Re: Plot curved line on a globe projection By: David Fanning on Sun, 28 July 2013 12:16
		Re: Plot curved line on a globe projection By: Sir Loin Steak on Sun, 28 July 2013 13:00
		Re: Plot curved line on a globe projection By: David Fanning on Sun, 28 July 2013 13:36
		Re: Plot curved line on a globe projection By: Sir Loin Steak on Sun, 28 July 2013 13:45

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