I am using the code below to extract census tract information.
save.tract$state, save.tract$county and save.tract$tract are returned as
factors. In the last three statements, I need to save the actual value of
the factor, but, instead, the code is yielding the position of the factor.
How do I instead return the value of the factor?
By way of example, for Lon=-82.49574 and Lat=29.71495, the code returns
state = 1, county = 1 and tract = 161. The desired results are state=12,
county = 001 tract = 002201.
#set libraries
library(UScensus2000tract)
library(gdata)
data(florida.tract)
#read input
dbs.in = read.delim("addresses_coded_new.txt", header = TRUE, sep = "\t",
quote="\"", dec=".")
#instantiate output
more.columns <- data.frame( state=double(0),
county=double(0),
tract=double(0))
dbs.in <- cbind(dbs.in,more.columns)
#fiure out how many times to loop
j <- nrow(dbs.in)
#loop through each lab/long and assign census tract
for (i in 1:j) {
index<-overlay(SpatialPoints(cbind(dbs.in$Lon[i],dbs.in$Lat[i])),florida.tract)
save.tract<-florida.tract[index,]
dbs.in$state[i] <- save.tract$state #this is returning the position
in the list instead of the value
dbs.in$county[i] <- save.tract$county #this is returning the
position in the list instead of the value
dbs.in$tract[i] <- save.tract$tract #this is returning the position
in the list instead of the value
}
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