IDW with barriers

[GiorgiaB]

Hello!
I performed an IDW with barriers. I set as input the variable search radius and I specified 5 points to be considered. After a few hours, I obtained an output raster but it has some holes (pic attached). What can I do? Some points look isolated. Can I obtain continuous rasters (within the specified barriers)? I have ArcGIS 10 and I use Spatial Analysis. Thank you

[DanPatterson_Retired]

given your point locations, limited number of points and your constrained barriers, I doubt it

[SteveLynch]

IDW uses a "line of sight" approach when barriers are used. The output extent, by default is equal to that of the input points.

KernelInterpolationWithBarriers in Geostatistical Analyst, on the other hand, uses a "shortest route around" a barrier.

Hope that this answers your question.

Steve

[GiorgiaB]

Thank you for your replies. Ok I might improve the interpolation in borders area defining another extent (I left the default value for the extent so it has the extent of the input sample points). But still, what can I do for the area within the input sample points? I don�??t have the geostatistical analysis tool.

[SteveLynch]

Use SplineWithBarriers.

[GiorgiaB]

Use SplineWithBarriers.

Thank you for the tip. I tried once the spline method (without barriers) for the same dataset but I obtained a very flat surface. I don't know if in my case I can get something meaningful and different if I add barriers.