[R-sig-Geo] Data grid in kriging?

[Jon Olav Skoien]

You may be able to create a SpatialGridDataFrame from 
SpatialPolygonsDataFrame, but it depends on your polygon file. Are the 
polygons referring to the boundaries of grid cells? If sp0 is the 
SpatialPolygonsDataFrame you will probably get what you want with 
(untested):

sp1 = SpatialPointsDataFrame(coordinates(sp0), data = sp0 at data)
gridded(sp1) = TRUE
fullgrid(sp1) = TRUE

But I am not sure if this is what you should do in your case. I do not 
see any reference to a shape file in demo(krige), anyway, R does not 
care about how your data are stored outside R, only what type of spatial 
data it is (grid, points, polygons, lines), and whether the format can 
actually be read into R. meuse.grid is a grid, but you can also predict 
to points not being on a grid, or to polygons. Your observations can be 
points or a grid. The .grid extension of meuse.grid is just for 
convenience to show what kind of data you are working with, the name 
could also be meusePred or something completely else

If this does not help you, then try to describe your problem in more 
detail, what sort of data you have and what you would like to do with them.

Best wishes,
Jon

On 11-Jul-12 20:18, riaarinda wrote:
> specifically, what I ask is "How to create SpatialGridDataFrame from
> SpatialPolygonsDataFrame" ?

On 11-Jul-12 16:43, riaarinda wrote:
> Currently I am trying to do kriging function in R. When I see the demo(krige)
> in R, there are 2 data used. *.shp and *.grid. Can I use kriging when I only
> have shape file (*.shp)? What is data.grid actually and can I create the
> grid from shp file I have?
> Thank you
>
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-- 
Jon Olav Skøien
Joint Research Centre - European Commission
Institute for Environment and Sustainability (IES)
Land Resource Management Unit

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jon.skoien at jrc.ec.europa.eu
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