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Re: Astronomys` Sixth Neighbour Needs Help [message #36207 is a reply to message #36019]

Mon, 11 August 2003 14:20

google_forums
Messages: 3
Registered: August 2003

Junior Member

The trick is that I need the closest point that satisfies my condition
(the closest point that has a score -- population or whatnot --
greater than the test station)....

-David

wmc@bas.ac.uk wrote in message news:<3f37b61f@news.nwl.ac.uk>...
> I come across this sometimes. The basis of the solution is usually
> something like:
>
>> lon1=data.longitude & lon1(i)=-999
>> lat1=data.latitude & lat1(i)=-999
>
>> mindist=min(sqrt((lon1-lon1(i))^2+(lat1-lat1(i)^2),j)
>
> That finds you the closest city (j), without using the inner loop, and
> so is much faster. OK, it uses distance in lat-lon space: if you care about
> the exact coordinates you can use convert_coord to get it in whatever
> map projection you are using.
>
> -W.

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[Message index]

		Astronomys` Sixth Neighbour Needs Help By: touser2001 on Thu, 24 July 2003 13:40
		Re: Astronomys` Sixth Neighbour Needs Help By: touser2001 on Tue, 29 July 2003 15:21
		Re: Astronomys` Sixth Neighbour Needs Help By: David Fanning on Tue, 29 July 2003 10:16
		Re: Astronomys` Sixth Neighbour Needs Help By: Pavel Romashkin on Tue, 29 July 2003 08:40
		Re: Astronomys` Sixth Neighbour Needs Help By: jjbezair on Tue, 29 July 2003 06:34
		Re: Astronomys` Sixth Neighbour Needs Help By: David Fanning on Mon, 28 July 2003 15:27
		Re: Astronomys` Sixth Neighbour Needs Help By: touser2001 on Mon, 28 July 2003 14:53
		Re: Astronomys` Sixth Neighbour Needs Help By: touser2001 on Mon, 28 July 2003 14:40
		Re: Astronomys` Sixth Neighbour Needs Help By: pford on Mon, 28 July 2003 11:30
		Re: Astronomys` Sixth Neighbour Needs Help By: David Fanning on Mon, 28 July 2003 08:32
		Re: Astronomys` Sixth Neighbour Needs Help By: David Fanning on Mon, 28 July 2003 06:45
		Re: Astronomys` Sixth Neighbour Needs Help By: Ben Panter on Mon, 28 July 2003 05:40
		Re: Astronomys` Sixth Neighbour Needs Help By: JD Smith on Sun, 27 July 2003 23:22
		Re: Astronomys` Sixth Neighbour Needs Help By: touser2001 on Sat, 26 July 2003 13:48
		Re: Astronomys` Sixth Neighbour Needs Help By: Ben Panter on Sat, 26 July 2003 00:48
		Re: Astronomys` Sixth Neighbour Needs Help By: touser2001 on Fri, 25 July 2003 19:14
		Re: Astronomys` Sixth Neighbour Needs Help By: Pavel Romashkin on Fri, 25 July 2003 15:34
		Re: Astronomys` Sixth Neighbour Needs Help By: wmconnolley on Mon, 11 August 2003 08:28
		Re: Astronomys` Sixth Neighbour Needs Help By: google_forums on Mon, 11 August 2003 14:20
		Re: Astronomys` Sixth Neighbour Needs Help By: google_forums on Mon, 11 August 2003 07:53
		Re: Astronomys` Sixth Neighbour Needs Help By: wmconnolley on Tue, 12 August 2003 09:57
		Re: Astronomys` Sixth Neighbour Needs Help By: google_forums on Tue, 12 August 2003 09:11
		Re: Astronomys` Sixth Neighbour Needs Help By: wmconnolley on Tue, 12 August 2003 01:40

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