R: help to creating a points subset with R: Cut points shapefaile with a buffer polygon shapefile

Thanks for your help and Sorry for my ineptitude

Do you tell about "Methods for spatially overlay-ing points (grids) and
polygons layers" or "spatial overlay for points grids and polygons"? 
I had see in help(sp) but, sorry, It's not very help clear for not expertise
like me. I have this two shapefile (point and buffer) but the point is very
hug dataset and read in maptools is not possible (memory crash down).

Canopy (points)
Buffer (polygon)

I know that I must get a spatialPointsDataFrame (=canopy) then load the
Polygon (=buffer), but after "I am in the middle of Ocean with a small ship"

Thanks again if you could help me 

Alessandro




-----Messaggio originale-----
Da: Paul Hiemstra [mailto:p.hiemstra at geo.uu.nl] 
Inviato: mercoled? 25 febbraio 2009 23.24
A: Alessandro
Cc: r-sig-geo at stat.math.ethz.ch
Oggetto: Re: [R-sig-Geo] help to creating a points subset with R: Cut points
shapefaile with a buffer polygon shapefile

Hi,

Have you tried the overlay command in the sp package?

cheers,
Paul

Alessandro schreef:
  

Hi All Researcher, 

 

Thanks for help and suggestions. 

 

I have a points shapefile (soil) with one column [H] and a circular buffer
polygons (plots) with a column [ID identify. Ex: 1,2,3 etc etc]. I wish to
clip the points shapefile with the buffer and obtain a new points shape
    

file
  

(only the points inside the buffer) with two columns [ID of buffer and H).

 

I have with maptools problem with memory because every time my R
    

crash-down.
  

 

 Any suggestions would be appreciated. 

 

Thanks again

 

Ale


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