Hi
Please forgive me if I am asking a simple question.
I would like to add values in a column vector to readShapePoly() object
and show a map based on these values using spplot() or addPoly().
Basically, my raw data are employment census data with the coordinates
(X,Y).
tmp1 <- read.csv("tmp1.csv",header=T)
names(tmp1)
[1] "TAZ" "X" "Y"
[4] "X_UTM" "Y_UTM" "Perimeter"
[7] "Area" "in.n" "D_mean.dist"
[10] "D_median.dist" "D_mean.mean.time" "D_mean.median.time"
[13] "out.n" "O_mean.dist" "O_median.dist"
[16] "O_mean.mean.time" "O_mean.median.time"
map <- readShapePoly("Akron",proj4string=CRS("+proj=longlat
+datum=NAD27"))
names(map)
[1] "SOURCELYR" "SHAPECODE" "COUNTY" "SHORTLAB" "LONGLAB"
"X"
[7] "Y" "X_UTM" "Y_UTM" "Perimeter" "Area"
tmp1/tmp2 and map have the same nrows and the same coordinates (X,Y).
Any suggestions? Should I modify .dbf files before loading .shp files?
Or are there functions like join_table in ArcGIS? Or should I convert
tmp1 into a polypoint object and overlay it on map?
Thank you very much.
Takatsugu
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