Dear GeoUseRs,

>From the large number of methods that can be used to spatially interpolate
data, we tried several of them (Inverse Distance Weighted, Natural
Neighbour, Spline, Kriging, Co-Kriging) on our dataset. We used ArcGIS to
apply the first three and R for kriging and test possibilities of
co-kriging.

 We do not have external independent data to test results of interpolations.
The solution is probably to do a kind of cross-validation but doing it into
ArcGIS seems difficult to implement.
I know that I can do Inverse distance weighted interpolation in R but ...

- Is it possible to do Natural Neighbour and Spline interpolation in R ? And
if yes how ?

ArcGIS tools propose to consider "barriers" when using Inverse Distance
Weighted and Spline tools. Thus, for example, interpolation occurring North
from an island do not consider information located South of this island ...
a quite important thing in our case.

- I wondering if it is possible to do the same with gstat or another package
?

Thanks for your help !

Arnaud

	[[alternative HTML version deleted]]

