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Re: vector layer comparison in IDL [message #42857 is a reply to message #42824]

Thu, 03 March 2005 14:42

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

Mark Hadfield wrote:
> function magic_distance_function, x, y, x0, y0, x1, y1
>
> compile_opt DEFINT32
> compile_opt STRICTARR
> compile_opt STRICTARRSUBS
> compile_opt LOGICAL_PREDICATE
>
> d0 = sqrt((x-x0)^2+(y-y0)^2)
> d1 = sqrt((x-x1)^2+(y-y1)^2)
> dp = 2.0*poly_area([x,x0,x1],[y,y0,y1]) / $
> sqrt((x1-x0)^2+(y1-y0)^2)
>
> return, dp > (d0 < d1)
>
> end

Jim Pendleton of RSI has pointed out to me that there is an IDL function
called PNT_LINE that does this.

--
Mark Hadfield "Ka puwaha te tai nei, Hoea tatou"
m.hadfield@niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)

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[Message index]

		Re: vector layer comparison in IDL By: Mark Hadfield on Fri, 25 February 2005 15:16
		Re: vector layer comparison in IDL By: yp on Fri, 25 February 2005 06:35
		Re: vector layer comparison in IDL By: Mark Hadfield on Wed, 23 February 2005 12:06
		Re: vector layer comparison in IDL By: yp on Wed, 23 February 2005 02:23
		Re: vector layer comparison in IDL By: David Fanning on Thu, 03 March 2005 14:58
		Re: vector layer comparison in IDL By: Mark Hadfield on Thu, 03 March 2005 14:42
		Re: vector layer comparison in IDL By: David Fanning on Thu, 03 March 2005 13:26
		Re: vector layer comparison in IDL By: Mark Hadfield on Thu, 03 March 2005 13:08
		Re: vector layer comparison in IDL By: yp on Thu, 03 March 2005 03:00
		Re: vector layer comparison in IDL By: Mark Hadfield on Tue, 01 March 2005 12:55
		Re: vector layer comparison in IDL By: yp on Tue, 01 March 2005 02:25
		Re: vector layer comparison in IDL By: Mark Hadfield on Mon, 28 February 2005 11:48
		Re: vector layer comparison in IDL By: yp on Mon, 28 February 2005 11:27
		Re: vector layer comparison in IDL By: Mark Hadfield on Sun, 27 February 2005 13:18

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