[R] Interpolation of azimuth values

[temiz]

Hello

I will make an interpolation of data which represents azimuth direction
( angle from north in clockwise direction) values.
But there is a problem.
Say, for instance, while 1 and 359 indicate somewhat same direction, 
interpolation puts  values
in the range from 1 to 359.  What can I do to solve the problem ?

Anything you offer ?

thanks in advance

Ahmet Temiz
General Directory of Disaster Affairs
Ankara TURKEY


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Re: [R] Interpolation of azimuth values

[Prof Brian Ripley]

On Thu, 16 Oct 2003, temiz wrote:

 I will make an interpolation of data which represents azimuth direction
 ( angle from north in clockwise direction) values.
 But there is a problem.
 Say, for instance, while 1 and 359 indicate somewhat same direction, 
 interpolation puts  values
 in the range from 1 to 359.  What can I do to solve the problem ?
 
 Anything you offer ?

The usual solution is to extend the data periodically, that is to put 
copies shifted by one rotation on each side.

-- 
Brian D. Ripley,  [EMAIL PROTECTED]
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel:  +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UKFax:  +44 1865 272595

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