Andrew ?merge
HTH ...... Peter Alspach > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Andrew McFadden > Sent: Wednesday, 7 May 2008 9:23 a.m. > To: r-help@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 > > > > > > ############################################################## > ########## > This email message and any attachment(s) is intended solely for the > addressee(s) named above. The information it contains is confidential > and may be legally privileged. Unauthorised use of the > message, or the > information it contains, may be unlawful. If you have received this > message by mistake please call the sender immediately on 64 4 8940100 > or notify us by return email and erase the original message and > attachments. Thank you. > > The Ministry of Agriculture and Forestry accepts no responsibility for > changes made to this email or to any attachments after > transmission from > the office. > ############################################################## > ########## > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > The contents of this e-mail are privileged and/or confidential to the named recipient and are not to be used by any other person and/or organisation. If you have received this e-mail in error, please notify the sender and delete all material pertaining to this e-mail. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
