[R-sig-Geo] kriging as fish swim, not as crows fly

[Michael Sumner]

Not kriging as such, but check out the soap-film smoothing in package mgcv:

http://www.maths.bath.ac.uk/~sw283/simon/papers/soap.pdf

FWIW, there are binning methods with MCMC in the package
tripEstimation that have similar features, but they are particularly
focussed on individual track estimation and probably not easily
applied. Is location uncertainty a big issue for your data? What are
the input locations?

Cheers, Mike.


On Wed, Jan 27, 2010 at 7:06 PM, Martin Renner
<martin.renner at stonebow.otago.ac.nz> wrote:
> Hi All,
>
> I want to kirg fish and seabird densities within an estuary which has several arms. Since neither organisms cross land, the appropriate distances would not be euclidian but over-water (as fish swim). There are several papers, describing this problem and how to deal with it (see below), but I have not found an easily accessible implementation. Is anybody aware of a solution in R?
>
> Best,
> Martin
>
>
>
> @article{Rathbun:1998aa,
>        Author = {Rathbun, Stephen L.},
>        Journal = {Environmetrics},
>        Number = {2},
>        Pages = {109--129},
>        Title = {Spatial modelling in irregularly shaped regions: kriging estuaries},
>        Volume = {9},
>        Year = {1998}}
>
> @article{Little:1997aa,
>        Author = {Little, Laurie S. and Edwards, Don and Porter, Dwayne E.},
>        Journal = {Journal of Experimental Marine Biology and Ecology},
>        Number = {1},
>        Pages = {1--11},
>        Title = {Kriging in estuaries: as the crow flies, or as the fish swims?},
>        Volume = {213},
>        Year = {1997}}
>
>
>
>
> Martin Renner
> US Geological Survey
> Alaska Science Center
>
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