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Re: day or night [message #82637 is a reply to message #82636]

Thu, 27 December 2012 04:03

Gompie
Messages: 76
Registered: August 2012

Member

Hi David
Thanks !!!
I have more than 62000 points that are spread over different seasons and lat lons ,on which I have to apply the day/night test.

Is it possible to map the lat lon onto the image coordinates of the image output of cgterminator or sunclock and get a number telling me if it is day or night at that point.

PS:
sunclock routine in the link you gave ( http://fermi.jhuapl.edu/s1r/idl/s1rlib/local_idl.html) looks promising if takes care of seasonal variations.

If I use cgterminator, due to its problem with flip, I have visually inspect each of the 62000 points so practically not possible unless you give a way out.
Gompie

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[Message index]

		Re: day or night By: David Fanning on Thu, 27 December 2012 08:06
		Re: day or night By: Gompie on Thu, 27 December 2012 04:03
		Re: day or night By: David Fanning on Wed, 26 December 2012 22:52
		Re: day or night By: David Fanning on Wed, 26 December 2012 22:21

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