On Wed, Mar 5, 2014 at 11:09 PM, Moshood Agba Bakare <bakare@ualberta.ca>wrote:

> Dear All,
> An interpolation grid of spacing 100m by 100m was created for irregular
> space spatial data. The plot of the grid and sample data shows some grid
> points outside the data area. I guess the preducted values of thos points
> outside the data area will not be reliable.


 The standard error of the point estimates will be large yes.

How do I modify my R script so
> that the grid can be created within the domain of sample data.
>
>
 Your code generates a set of grid points within the x-y bounding box of
the data (but I can't be sure because you haven't given us your data). Do
you have some other constraint to mean 'within the domain'? Do you have a
polygonal region that defines your survey area? If so then there's various
well-documented ways to crop either points or rasters to polygons. Hard to
see without a picture of your data.

Barry

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