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Re: Already written function to find if a point is within a rectangle? [message #79391 is a reply to message #79347]

Thu, 23 February 2012 10:05

Greg Hennessy
Messages: 45
Registered: November 2005

Member

>> I'm thinking of making polygons with a large number of edges, instead
>> of rectangles, with every data point at the edge of a FITS file as a
>> vertex. That would minimize the projection error, right?
>
> That helps. Special care is probably need around the poles though.

It often helps to convert from ra/dec to unit vectors
([cos(ra)*cos(dec),sin(ra)*cos(dec),sin(dec)]) for both
the star position and the edges of the polygon.

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[Message index]

		Already written function to find if a point is within a rectangle? By: Jacare Omoplata on Mon, 20 February 2012 13:29
		Re: Already written function to find if a point is within a rectangle? By: Jacare Omoplata on Fri, 24 February 2012 22:33
		Re: Already written function to find if a point is within a rectangle? By: suruchi on Sat, 18 May 2013 21:19
		Re: Already written function to find if a point is within a rectangle? By: JDS on Fri, 24 February 2012 14:00
		Re: Already written function to find if a point is within a rectangle? By: Jacare Omoplata on Fri, 24 February 2012 10:48
		Re: Already written function to find if a point is within a rectangle? By: penteado on Thu, 23 February 2012 11:13
		Re: Already written function to find if a point is within a rectangle? By: Greg Hennessy on Thu, 23 February 2012 10:05
		Re: Already written function to find if a point is within a rectangle? By: Craig Markwardt on Thu, 23 February 2012 01:34

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