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Re: Vectorized great circle calculations [message #70362 is a reply to message #70361]

Thu, 01 April 2010 14:24

Kenneth P. Bowman
Messages: 585
Registered: May 2000

Senior Member

In article
<19d72d21-41e1-4f5a-9694-f80d9d4a6da1@j21g2000yqh.googlegroups.com>,
Maxwell Peck <maxjpeck@gmail.com> wrote:

> Not that this really answers the question but this site
>
> http://williams.best.vwh.net/avform.htm
>
> Is very good for finding these sort of formula, most of them are an
> almost copy and paste into IDL.
>
> Max
>
> On Apr 2, 5:22�am, "Kenneth P. Bowman" <k-bow...@null.edu> wrote:
>> Can anyone point me to vectorized versions of LL_ARC_DISTANCE and
>> MAP_2POINTS or something similar? �(BTW, I nominate those two routines
>> for worst mnemonic value among all IDL routine names.)
>>
>> I need to compute the lon-lat coordinates of points a specified
>> distance along great circles between many points and a target point.
>>
>> I am hoping to avoid having to puzzle through the spherical
>> trigonometry identities yet again in order to roll my own.
>>
>> Thanks, Ken

I have already vectorized the code for LL_ARC_DISTANCE.
It was relatively straightforward. MAP_2POINTS is uglier,
as it does a bunch of different things, but it shouldn't
be too hard to vectorize the part of it that I care about.

But, this is not the most productive use of my time.

Thanks, Ken

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[Message index]

		Re: Vectorized great circle calculations By: David Fanning on Fri, 02 April 2010 07:35
		Re: Vectorized great circle calculations By: Kenneth P. Bowman on Fri, 02 April 2010 07:15
		Re: Vectorized great circle calculations By: David Fanning on Thu, 01 April 2010 14:54
		Re: Vectorized great circle calculations By: Kenneth P. Bowman on Thu, 01 April 2010 14:24
		Re: Vectorized great circle calculations By: Maxwell Peck on Thu, 01 April 2010 14:02

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