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

[Martin Renner]

Hi Facu,

great, this is just what I have been looking for. You say that your modifications to geoR are open source. On your website I found the geoR.dll file, but no source code. The .dll is of little use platforms other than windows. Is there any way I could get the source? 

Thank you for the help! Best,

Martin



On 28 Jan 2010, at 03:42 , Facundo Muñoz wrote:

> Hi Martin.
> 
> I have succeeded in doing something like that.
> Please see http://dx.doi.org/10.1016/j.mcm.2009.05.021.
> 
> I used GRASS for the computation of the non-euclidean distances and modified the geoR library in order to be able to estimate de variograms and perform kriging prediction with those "customized" distances.
> 
> Both the GRASS script for computing distances and the modified geoR library are open source and available at http://www.geeitema.org/guenmap/index.jsp?opcion=resultados
> 
> 
> I hope it helps.
> 	ƒacu.-
> 
> 
> Martin Renner escribió:
>> 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			
>