[R-sig-Geo] LL from bearing and distance

[Roger Bivand]

On Thu, 27 Sep 2007, Eric Archer wrote:

> Is there a package that contains a function that will allow me to calculate 
> the ending latitude and longitude given a starting point on the earth's 
> surface and bearing and distance?  I have searched the archives but have been 
> unable to find one and would like to double check before I try to roll my 
> own.  Thanks for any pointers.

Nothing for this case - azimuth for two points is in gzAzimuth() in 
maptools, so that might be a way in. There is C code for the spDistsN1() 
function in the sp package, visible in the CVS repository at the r-spatial 
site at sourceforge, but neither of these meets your need directly. If you 
do "roll your own", please consider contributing to maptools.

Roger

>
> Cheers,
> eric
>
>

-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no