[R-sig-Geo] Calculate location given observation distance and angle from transect line

[Robert J. Hijmans]

Corrie:

I think you can use the function 'destPoint' in 'geosphere', It
computes (for longitude/latitude coordinate data) the coordinates of a
destination point given a start point, initial bearing, and distance.

Robert

On Wed, Feb 17, 2010 at 8:00 AM, Corrie Curtice <cc157 at duke.edu> wrote:
> Hello,
>
> I've turned up little in searching for a package that already has this
> function.  Dspat is close but I don't think it does quite what I want.
>
> I have observation data gathered from a ship transect doing a zig-zag
> pattern.  I have the current location of the ship, the ship's bearing,
> the angle from the transect to the sighting, and the observed distance
> to the sighting (and the height of the observer above water).  Is
> there already a package/function in R that will "easily" convert this
> information to the lat/lon of the observed animal?
>
> Thanks for any help or guidance.
>
> Corrie
>
> ---
> Corrie Curtice
> Research Associate
> Marine Geospatial Ecology Lab
> Nicholas School of the Environment, Duke University
> http://mgel.env.duke.edu
> em: corrie.curtice at duke.edu
>
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