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Re: wrong results... [message #43924 is a reply to message #43811]

Tue, 03 May 2005 15:56

Ken Mankoff
Messages: 158
Registered: February 2000

Senior Member

On Tue, 3 May 2005, yp wrote:

> Kenneth Bowman wrote:
>>
>> lon = (lon + 360.0) MOD 360.0
>>
>
> Thats brilliant!
>
>> By the way, the reverse transformation is
>>
>> lon = lon - (LONG(lon)/180)*360.0
>>
>
> This is great too; but how to parse the last element? Using the
> above transformation, 180.0 becomes -180.0 at both ends. This does
> transform the coordinate exactlty for all elements except +180.0.
> Of course, zonally 180 = -180 from a geographic perspective.

The IDL astronomy library has a CIRRANGE procedure (circle range)
that forces things to 0->360. It is pretty easy to modify it to a
RANGECIR procedure that does the -180 to 180 range. Works for
radians too via a keyword. Check it out, it might be a good starting
place.

-k.

--
http://spacebit.dyndns.org/

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		wrong results... By: elias on Mon, 02 May 2005 06:49
		Re: wrong results... By: Ken Mankoff on Tue, 03 May 2005 15:56

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