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Re: Already written function to find if a point is within a rectangle? [message #79338]

Mon, 20 February 2012 19:22

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Feb 20, 5:56 pm, Paulo Penteado <pp.pente...@gmail.com> wrote:
>> So I need a way to find out if a point ( position of a star ) is
>> within a rectangle ( image boundary ). The rectangle edges are not
>> strictly horizontal or vertical.
>
> You talk about coordinates in RA and dec. So are the images really
> rectangular? It seems to me that the real problem is that you need to
> deal with spherical geometry.

Not only that, but an "image boundary" will be projection-dependent
[*]. For small images it probably won't matter much, but there will
always be an edge case that gets you later.

Craig

[*] "projection" = the cartographic projection which was used to turn
a curved sky into a flat image.

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[Message index]

		Re: Already written function to find if a point is within a rectangle? By: Craig Markwardt on Mon, 20 February 2012 19:22
		Re: Already written function to find if a point is within a rectangle? By: Jacare Omoplata on Mon, 20 February 2012 15:47
		Re: Already written function to find if a point is within a rectangle? By: Jacare Omoplata on Mon, 20 February 2012 15:37
		Re: Already written function to find if a point is within a rectangle? By: penteado on Mon, 20 February 2012 14:56
		Re: Already written function to find if a point is within a rectangle? By: David Fanning on Mon, 20 February 2012 14:09
		Re: Already written function to find if a point is within a rectangle? By: Jacare Omoplata on Wed, 22 February 2012 19:25

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