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R-script voor het downloaden en converteren van een JSON-bestand met locaties van jachthavens converteren naar shape-bestand
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library(httr) | |
library(jsonlite) | |
library(XML) | |
library(sp) | |
library(rgdal) | |
########################### | |
# Downloaden JSON-bestand # | |
########################### | |
r <- POST('http://toerisme.groningen.nl/over-groningen/groningen-op-de-kaart/zoeken?q=+Zoeken+op+woord,+bedrijfsnaam+of+plaats+&plaats=&branches[]=238', | |
add_headers(`X-Requested-With` = "XMLHttpRequest")) | |
# branche = 191 -> hotels | |
# branche = 3308 -> B&B | |
# branche = 200 -> hostels | |
stop_for_status(r) # Converteer indien van toepassing HTTP fout of waarschuwing naar R | |
x <- content(r, "parsed", "application/json") | |
######################## | |
# Inlezen JSON-bestand # | |
######################## | |
getValue1 <- function(label){ | |
for (j in 1:length(content)){ | |
if (length(content[[j]]) > 0) {if (regexpr(label, content[[j]]) > 0) return (sub(label, "", content[[j]]))} | |
} | |
return ("") | |
} | |
getValue2 <- function(label) { | |
for (j in 1:(length(content)-1)){ | |
if (length(content[[j]]) > 0) {if (content[[j]] == label) return (content[[j+1]])} | |
} | |
return ("") | |
} | |
df <- data.frame() | |
for (i in 1:length(x)) { | |
brancheid <- x[[i]]$brancheid | |
gidsvermelding <- x[[i]]$gidsvermelding | |
latitude <- x[[i]]$latitude | |
longitude <- x[[i]]$longitude | |
xmlnodes <- xmlTreeParse(x[[i]]$html) | |
rootnode <- xmlRoot(xmlnodes) | |
naam <- xmlValue(rootnode[[c("h3")]]) | |
content <- xmlSApply(rootnode[[c('p')]], xmlValue) | |
adres <- content[[1]] | |
postcode <- substr(content[[3]], 1, 7) | |
plaats <- substr(content[[3]], 9, nchar(content[[3]])) | |
telefoon <- getValue1("T: ") | |
fax <- getValue1("F: ") | |
website <- getValue2("Website:") | |
email <- getValue2("E:") | |
df <- rbind(df, data.frame(brancheid, gidsvermelding, latitude, longitude, naam, adres, postcode, plaats, telefoon, fax, website, email, stringsAsFactors = FALSE)) | |
} | |
############################## | |
# Exporteren naar shape-file # | |
############################## | |
colnames(df) = c("branche", "gidsvrm", "lat", "lon", "naam", "adres", "pc", "plaats", "tel", "fax", "web", "email") # Korte namen i.v.m. export naar shape-file | |
punten_wgs84 <- SpatialPointsDataFrame(df[, c('lon', 'lat')], df, proj4string = CRS("+proj=longlat")) | |
punten_rd <- spTransform(punten_wgs84, CRS("+init=epsg:28992")) | |
writeOGR(punten_rd, dsn = "d:/temp", layer = "jachthavens", driver = "ESRI Shapefile") |
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