[R] Spatial join between two datasets using x and y co-ordinates

[Peter Alspach]

Andrew

?merge

HTH ......

Peter Alspach
 

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Andrew McFadden
> Sent: Wednesday, 7 May 2008 9:23 a.m.
> To: r-help at r-project.org
> Subject: [R] Spatial join between two datasets using x and y 
> co-ordinates
> 
> Hi R users
> 
> I am trying to create a spatial join between two datasets. 
> 
> The first data set is large and contains descriptive data 
> including x and y co-ordinates. 
> 
> The second dataset is small and has been selected spatially. 
> The only data contained within the second dataset is the x 
> and y coordinates only i.e. no descriptive data.
> 
> The aim of a join made between the two datasets is to select 
> those points (and hence all the descriptive data) from 
> dataset one that has the same x and y co-ordinates as dataset two.
> 
> x1<-c(1824615,1823650,1821910)
> y1<-c(5980732,5983220,5990931)
> descript<-c("cat", "dog", "horse")
> dat1<-data.frame(x1,y1,descript)
> 
> x2<-c(1824615,1823650)
> y2<-c(5980732,5983220)
> dat2<-data.frame(x2,y2)
> 
> dat1
> dat2
> 
> The aim of the join is to produce:
> 
>        x1      y1 descript
> 1 1824615 5980732      cat
> 2 1823650 5983220      dog
> 
> And therefore limit the data in dataset 1 to that which has 
> the same x and y co-ordinates as dataset 2. 
> 
> Any suggestions?
> 
> Regards
> 
> Andy
> 
> 
> Andrew McFadden MVS BVSc
> Incursion Investigator
> Investigation & Diagnostic Centres - Wallaceville Biosecurity 
> New Zealand Ministry of Agriculture and Forestry
> 
> Phone 04 894 5600 Fax 04 894 4973 Mobile 029 894 5611 Postal address: 
> Investigation and Diagnostic Centre- Wallaceville Box 40742 
> Ward St Upper Hutt
> 
> 
> 
> 
> 
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