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[英]How do I convert county names to fips codes? (map county names to their fips)
[英]How can I convert Lat-Long to FIPS county code without problems in R?
我有成千上萬的緯度點,我使用此代碼將其轉換為FIPS縣代碼。
latlong2county <- function(pointsDF) {
# Prepare SpatialPolygons object with one SpatialPolygon
# per state (plus DC, minus HI & AK)
states <- map('county', fill=TRUE, col="transparent", plot=FALSE)
IDs <- sapply(strsplit(states$names, ":"), function(x) x[1])
states_sp <- map2SpatialPolygons(states, IDs=IDs,
proj4string=CRS("+proj=longlat +datum=wgs84"))
# Convert pointsDF to a SpatialPoints object
pointsSP <- SpatialPoints(pointsDF,
proj4string=CRS("+proj=longlat +datum=wgs84"))
# Use 'over' to get _indices_ of the Polygons object containing each point
indices <- over(pointsSP, states_sp)
# Return the state names of the Polygons object containing each point
stateNames <- sapply(states_sp@polygons, function(x) x@ID)
stateNames[indices]
}
data(county.fips)
latlon <- data.frame(all$lon,all$lat)
county<-latlong2county(latlon)
fips<-with(county.fips, fips[match(county, polyname)])
但是,這樣做的問題是它沒有將所有經緯度轉換為FIPS代碼。 我得到合法縣的NA值。 有人可以幫忙嗎?
還是只是提出其他解決方案?
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