
Hi Simon
 
A combination of functions gDistance, gBuffer and gIntersects from package rgeos should do the job. Also, have a look at www.naturalearthdata.com. They have various shapefiles with coastlines and land polygons, though I don't know how the resolution compares with the worldHires database.
 
Cheers,
Francois Rousseu
 

> Date: Thu, 14 Jul 2011 05:43:23 -0700
> From: s.j.goodman@leeds.ac.uk
> To: r-help@r-project.org
> Subject: [R] calculating distance inland from coastline
> 
> Hi All, 
> 
> Does anybody know of any existing functions that will calculate distance
> inland from a coastline?
> 
> It's possible to test if a lon,lat location is land or sea using
> map.where(), but I need to add a buffer to this of say 2km, to allow for
> points that are just on the coast, and below the resolution of the
> worldHires database.
> 
> I'm working with a marine mammal satellite telemetry dataset and wish to
> filter out spurious locations on land.
> 
> On another issue, does anybody know of any free vector map datasets that are
> more up to date and have a higher resolution than the worldHires database
> from the 'maps' package.
> 
> Thanks, Simon 
> 
> 
> 
> --
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