r - geocode result different from google maps -

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i'm trying geocode different iata airport codes in italy, following (rudimentary) code in ggmap (version 2.4)

#list of iata codes geo_apt <- c("aoi", "bgy", "blq", "bri", "cta", "fco", "lin", "mxp", "nap",  "pmf", "psa", "psr", "rmi", "trn", "vce", "vrn")  #preparing empty dataframe store geocodes apt_geo <- data.frame(iata=rep(na,16), lon=rep(na,16), lat=rep(na,16))  #geocoding codes (i in seq_along(geo_apt)) {   apt_geo[i,1] <- geo_apt[i]   apt_geo[i,2] <- (geocode(paste(geo_apt[i],"airport")))[1]   apt_geo[i,3] <- (geocode(paste(geo_apt[i],"airport")))[2] }

and geocode function of ggmap works fine of these codes except "psr"

   iata        lon      lat 1   aoi  13.363752 43.61654 2   bgy   9.703631 45.66957 3   blq  11.287859 44.53452 4   bri  16.765202 41.13751 5   cta  15.065775 37.46730 6   fco  12.246238 41.79989 7   lin   9.276308 45.45218 8   mxp   8.725531 45.63006 9   nap  14.286579 40.88299 10  pmf  10.295935 44.82326 11  psa  10.397884 43.68908 12  psr -81.117259 33.94855  #<- doens't work 13  rmi  12.618819 44.02289 14  trn   7.647867 45.19654 15  vce  12.339771 45.50506 16  vrn  10.890141 45.40000

i've tried use revgeocode , coordinates correspond following address:

revgeocode(as.numeric(apt_geo[12,2:3])) #information url : http://maps.googleapis.com/maps/api/geocode/json?latlng=33.948545,-81.1172588&sensor=false [1] "kentucky avenue, west columbia, sc 29170, usa"

on contrary, if go google maps, works fine:

map of pescara airport

does have clue on apparently strange phenomenon?

edit

following 1 suggestion in comments below, tried use geocode(italy psr airport) on version 2.4 again , instead of throwing more accurate result or same result, warning got:

geocode("italy psr airport")   lon lat 1  na  na warning message: geocode failed status zero_results, location = "italy psr airport"

while attempt airport psr coordinates different of psr airport (at least time it's actual airport, although iata code lex instead of psr).

revgeocode(as.numeric(geocode("airport psr"))) information url : http://maps.googleapis.com/maps/api/geocode/json?latlng=38.0381454,-84.5970727&sensor=false [1] "3895 terminal drive, lexington, ky 40510, usa"

the whole question possible duplicate

nonetheless, don't reason api , google maps using different datasets...


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