[R] R code for selecting places spatially and by time

From: Andrew McFadden <Andrew.McFadden_at_maf.govt.nz>
Date: Fri, 07 Mar 2008 11:40:15 +1300

Hi all

The code of trying to write relates to selecting properties (given by x and y co-ordinates) spatially (distance "X" from "infected" properties identified by date) over a certain time period.

i.e. what properties are within 3 km from properties infected on "2008-01-01" over the last 14 days.

Is any one able to give me some clues on how to write code to solve this problem.

Some sample data is as follows:

x<-rep(c(2660156,2660203,2658165,2659303,2661531,2660914),c(2,2,2,2,1,1)
)

y<-rep(c(6476767,6475013,6475487,6479659,6477004,6476388),c(2,2,2,2,1,1)
)

date<-as.character(rep(as.Date(c("2008-01-02","2008-01-17","2008-01-01") ,format = "%Y-%m-%d"),c(4,4,2)))
cbind(x,y,date)

Regards

Andrew

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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