Extraction de données JSON à partir de l'API de géocodage Google dans R

Question

Je ne suis pas familier avec la structure de données JSON et je suis incapable d'en extraire des données.

Ce sont les lignes d'échantillons à partir des données JSON qui sont stockées dans le fichier csv

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India","geometry":{"bounds":{"northeast":{"lat":18.5105018,"lng":73.9287002},"southwest":{"lat":18.4785059,"lng":73.87890030000001}},"location":{"lat":18.492095,"lng":73.90017759999999},"location_type":"APPROXIMATE","viewport":{"northeast":{"lat":18.5105018,"lng":73.9287002},"southwest":{"lat":18.4785059,"lng":73.87890030000001}}},"place_id":"ChIJ-64DzdvBwjsRKzv08MBrn18","types":["postal_code"]},{"address_components":[{"long_name":"Pune","short_name":"Pune","types":["administrative_area_level_2","political"]},{"long_name":"Maharashtra","short_name":"MH","types":["administrative_area_level_1","political"]},{"long_name":"India","short_name":"IN","types":["country","political"]}],"formatted_address":"Pune, Maharashtra, 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India","geometry":{"location":{"lat":18.510892,"lng":73.906956},"location_type":"GEOMETRIC_CENTER","viewport":{"northeast":{"lat":18.5122409802915,"lng":73.9083049802915},"southwest":{"lat":18.5095430197085,"lng":73.90560701970848}}},"place_id":"ChIJ5YdfqcDBwjsR5VJutWLCsfA","types":["bus_station","establishment","point_of_interest","transit_station"]}],"status":"OK"} 
row2) {"results":[{"address_components":[{"long_name":"Canal Road","short_name":"Canal Rd","types":["route"]},{"long_name":"Empress Garden View Society","short_name":"Empress Garden View Society","types":["political","sublocality","sublocality_level_3"]},{"long_name":"Uday Baug","short_name":"Uday Baug","types":["political","sublocality","sublocality_level_2"]},{"long_name":"Ghorpadi","short_name":"Ghorpadi","types":["political","sublocality","sublocality_level_1"]},{"long_name":"Pune","short_name":"Pune","types":["locality","political"]},{"long_name":"Pune","short_name":"Pune","types":["administrative_area_level_2","political"]},{"long_name":"Maharashtra","short_name":"MH","types":["administrative_area_level_1","political"]},{"long_name":"India","short_name":"IN","types":["country","political"]},{"long_name":"411001","short_name":"411001","types":["postal_code"]}],"formatted_address":"Canal Rd, Empress Garden View Society, Uday Baug, Ghorpadi, Pune, Maharashtra 411001, 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Mala","types":["political","sublocality","sublocality_level_2"]},{"long_name":"Wanowrie","short_name":"Wanowrie","types":["political","sublocality","sublocality_level_1"]},{"long_name":"Pune","short_name":"Pune","types":["locality","political"]},{"long_name":"Pune","short_name":"Pune","types":["administrative_area_level_2","political"]},{"long_name":"Maharashtra","short_name":"MH","types":["administrative_area_level_1","political"]},{"long_name":"India","short_name":"IN","types":["country","political"]}],"formatted_address":"Jambhulkar Mala, Wanowrie, Pune, Maharashtra, 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row3) {"results":[{"address_components":[{"long_name":"Canal Road","short_name":"Canal Rd","types":["route"]},{"long_name":"Empress Garden View Society","short_name":"Empress Garden View Society","types":["political","sublocality","sublocality_level_3"]},{"long_name":"Uday Baug","short_name":"Uday Baug","types":["political","sublocality","sublocality_level_2"]},{"long_name":"Ghorpadi","short_name":"Ghorpadi","types":["political","sublocality","sublocality_level_1"]},{"long_name":"Pune","short_name":"Pune","types":["locality","political"]},{"long_name":"Pune","short_name":"Pune","types":["administrative_area_level_2","political"]},{"long_name":"Maharashtra","short_name":"MH","types":["administrative_area_level_1","political"]},{"long_name":"India","short_name":"IN","types":["country","political"]},{"long_name":"411001","short_name":"411001","types":["postal_code"]}],"formatted_address":"Canal Rd, Empress Garden View Society, Uday Baug, Ghorpadi, Pune, Maharashtra 411001, 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J'essaie d'extraire les valeurs de la première occurrence d'adresse composant

telle que mon mannequin code ressemble

Je vérifie pour ces vecteurs de caractères

chck_list=c("street_address","street_number","route","intersection","political","country","administrative_area_level_1","administrative_area_level_2","administrative_area_level_3","administrative_area_level_4","administrative_area_level_5","colloquial_area","locality","ward","sublocality","neighborhood","premise","subpremise","postal_code","natural_feature","airport","park","point_of_interest") 

c'est le code d'essai

js <- fromJSON(as.character(json_data_df1[1:nrow(json_data_df1), 'Json_obj'])) 
    count_numb=list() 
    Type=list() 
    long_name=list() 
    short_name=list() 

    for(i in 1:nrows(js)){ 
    if(js$status=="ok"){ 
    count_numb[i] <- length(js[1:nrows(js)][grep("type",js$results[[1]]$address_components[[1]])]) #Counting number of times the word "type" occurs so that the loop can be iterated that many number of times. 
    if(js$results[[1]]$address_components[[1]] %in% chck_list) { 
    Type[i] = #print the word from the object chck_list that is present in data 
    long_name[i] = #print the value of long_name from the data that corresponds to Type[i] 
    short_name[i] = #print the value of short_name from the data that corresponds to Type[i] 
    } 
} 

SO mon o/p ressemblerait

 Street_number route        neighborhood   sublocality_level_2  sublocality_level_1 Locality  Sub_locality_level_3    .... 
1)  16   Bhagwan Tatyasaheb Kawade Road  Palmgrove Society  Uday Baug    Ghorpadi    Pune   NA        .... 
2)  NA   Canal Road       NA     Uday Baug    Ghorpadi    Pune   Empress Garden View Society       
.  .    . 
.  .    . 
.  .    . 

P.S= json_data_df1 is the name of my data frame;; Json_obj is the name of the column in which Json object is present

Est-ce que quelqu'un a une idée de comment puis-je aller.

Toute aide serait grandement appréciée.

Merci.

Answer 1

Je pense que vous devez d'abord utiliser simplifyDataFrame = FALSE dans la fonction fromJSON afin d'obtenir les données sous forme de liste:

dat = jsonlite::fromJSON("your_example_data.json", simplifyDataFrame = FALSE) 

Ensuite, utilisez un lapply imbriqué pour recevoir les trois éléments de chaque sous-liste (fonction I modifiée le lapply() en tenant compte de votre dernier commentaire ),

res = lapply(dat, function(x) { 

    lapply(x[["results"]], function(y) { 

    do.call(rbind, lapply(y[['address_components']], function(z) { 

     if (is.null(z)) {       # if array is empty return NA's for all 3 output items 

     c(rep(NA, 3))} 

     else { 

     tmp_array_type = z[['types']]    # temporarily get the json-array including "street_number", "route", "neighborhood" etc. 

     if (length(tmp_array_type) == 0) {   # if array is of length 0 then return NA 

      out_type = NA} 

     else if (length(tmp_array_type) == 3) {  # it array is of length 3 return the 3rd item 

      out_type = z[['types']][3]} 

     else if (("political" %in% tmp_array_type) && length(tmp_array_type) > 1) { # if array includes political and it's length is greater than 1 then remove political and then receive the 1st item 

      tmp_array_type = tmp_array_type[-which(tmp_array_type == "political")] 

      out_type = tmp_array_type[1]} 

     else { 

      out_type = tmp_array_type[1]     # for all other cases return the 1st item of the array 
     } 

     c(out_type, z[['long_name']], z[['short_name']]) 
     } 
    })) 
    }) 
}) 

exemple sortie

[[1]] 
[[1]][[1]] 
     [,1]       [,2]        [,3]    
[1,] "street_number"    "16"        "16"    
[2,] "route"      "Bhagwan Tatyasaheb Kawade Road" "BT Kawde Road"  
[3,] "neighborhood"    "Palmgrove Society"    "Palmgrove Society" 
[4,] "sublocality_level_2"   "Uday Baug"      "Uday Baug"   
[5,] "sublocality_level_1"   "Ghorpadi"      "Ghorpadi"   
[6,] "locality"     "Pune"       "Pune"    
[7,] "administrative_area_level_2" "Pune"       "Pune"    
[8,] "administrative_area_level_1" "Maharashtra"     "MH"    
[9,] "country"      "India"       "IN"    
[10,] "postal_code"     "411001"       "411001"   

[[1]][[2]] 
    [,1]       [,2]    [,3]    
[1,] "sublocality_level_2"   "Jambhulkar Mala" "Jambhulkar Mala" 
[2,] "sublocality_level_1"   "Wanowrie"  "Wanowrie"  
[3,] "locality"     "Pune"   "Pune"   
[4,] "administrative_area_level_2" "Pune"   "Pune"   
[5,] "administrative_area_level_1" "Maharashtra"  "MH"    
[6,] "country"     

..... 

Si vous souhaitez modifier la fonction ou les déclarations IfElse puis un bon tutoriel peut être trouvé here lapply().

Answer 2

Il y a quelques paquets de géocodage disponibles qui vous faciliteront la vie, comme mon paquet googleway qui interroge diverses API Google et «simplifie» les résultats dans des data.frames/lists. De là, vous pouvez extraire vos éléments requis en utilisant les méthodes standard de sous-liste list/data.frame.

library(googleway) 

addresses <- c("Bhagwan Tatyasaheb Kawade Road", "Empress Garden View Society") 
apiKey <- 'your_api_key' 

lst_geocode <- lapply(addresses, function(x){ 
    google_geocode(address = x, 
           key = apiKey) 
}) 

lapply(lst_geocode, function(x){ 
    x[['results']][['address_components']] 
}) 

# [[1]] 
# [[1]][[1]] 
# long_name short_name         types 
# 1 Bhagwan Tatyasaheb Kawade Road BT Kawde Road         route 
# 2       Pune   Pune     locality, political 
# 3       Pune   Pune administrative_area_level_2, political 
# 4     Maharashtra   MH administrative_area_level_1, political 
# 5       India   IN      country, political 
# 
# 
# [[2]] 
# [[2]][[1]] 
# long_name   short_name          types 
# 1 Sopan Baug Road  Sopan Baug Rd          route 
# 2 Sopan Baug Society Sopan Baug Society political, sublocality, sublocality_level_3 
# 3  Kavade Mala  Kavade Mala political, sublocality, sublocality_level_2 
# 4   Ghorpadi   Ghorpadi political, sublocality, sublocality_level_1 
# 5    Pune    Pune       locality, political 
# 6    Pune    Pune  administrative_area_level_2, political 
# 7  Maharashtra     MH  administrative_area_level_1, political 
# 8    India     IN       country, political 
# 9    411001    411001         postal_code