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Re: Already written function to find if a point is within a rectangle? [message #79356 is a reply to message #79347]

Fri, 24 February 2012 10:48

Jacare Omoplata
Messages: 6
Registered: February 2012

Junior Member

On Feb 23, 1:05 pm, Greg Hennessy <greg.henne...@cox.net> wrote:
>>> 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.

That's brilliant idea!

I'm not going to bother with it for this problem, since I've already
half written the program, and the images are not near the poles or the
longitude boundary. I will definitely use it in the future though.

Thanks.

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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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