Hi,
Please also send your replies to the mailing list, and not only to me
personally. Other people might have better ideas than I have.
If your shapefile is too big for your memory, try to cut it up and do
your analysis on a subset of both your point data and polygon data. And
please provide us with information on you system, is it 64 bit or 32
bit, how much memory, which version of R, which operating system. Look
at the sessionInfo command to get some of this info. To get more hints
as how to write good posts, please read the posting guide for the main R
list, R-help.
cheers,
Paul
Alessandro schreef:
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.hiems...@geo.uu.nl]
Inviato: mercoledì 25 febbraio 2009 23.24
A: Alessandro
Cc: r-sig-geo@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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Department of Physical Geography
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University of Utrecht
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