[R-sig-Geo] select polygons in polygons

[Murray Richardson]

Thanks Edzer - I looked into it but I need to coerce the SPDF objects to 
gpc.poly objects and then I will lose all the attribute data I think. 

I may just have to use RODBC with postGIS to speed up the selection 
process, which has worked well for me in other situations, but makes the 
scripts that much more cumbersome.

cheers

Murray

Edzer Pebesma wrote:
> That's right, it is not there; I thought this morning about a way to 
> look whether all the points of one polygon fall in another, which sp's 
> overlay could do, but that's not a sufficient condition.
>
> Perhaps functions in package gpclib can do this?
> -- 
> Edzer
>
> Murray Richardson wrote:
>> Thanks Friderike.  I assumed this was the answer, but it doesn't 
>> appear to work with two SPDF objects.  i.e.:
>>
>> > overlay(polysA,polysB)
>> Error in function (classes, fdef, mtable)  :
>>  unable to find an inherited method for function "overlay", for 
>> signature "SpatialPolygonsDataFrame", "SpatialPolygonsDataFrame"
>>
>>
>> Murray
>>
>>
>> Oehler, Friderike (AGPP) wrote:
>>> Try ?overlay
>>>
>>> Regards,
>>> Friderike
>>>
>>>
>>> -----Original Message-----
>>> From: r-sig-geo-bounces at stat.math.ethz.ch
>>> [mailto:r-sig-geo-bounces at stat.math.ethz.ch] On Behalf Of Murray 
>>> Richardson
>>> Sent: 25 September 2008 06:01
>>> To: r-sig-geo at stat.math.ethz.ch
>>> Subject: [R-sig-Geo] select polygons in polygons
>>>
>>>
>>> Hello users,
>>>
>>> There is probably a very simple solution to this that I am missing: 
>>> is there a way to select polygons in one SPDF that fall within the 
>>> polygons of another SPDF? This would save me a lot of processing 
>>> time as I am having to take a very circuitous route to achieve the 
>>> same outcome.
>>>
>>> Thanks!
>>>
>>> Murray
>>>
>>> _______________________________________________
>>> R-sig-Geo mailing list
>>> R-sig-Geo at stat.math.ethz.ch 
>>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>>>
>>>
>>
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>