爲什麼Google的Places服務使用不同屬性（place_id，coords ecc ..）爲我提供兩次相同的城市？

我想只有一個從Web服務自動完成獨特的結果：爲什麼Google的Places服務使用不同屬性（place_id，coords ecc ..）爲我提供兩次相同的城市？

這是我的要求： https://maps.googleapis.com/maps/api/place/autocomplete/json?input=napoli ita&type=(cities)&language=en&key={API_KEY}

，這是響應

{ 
    "predictions": [ 
    { 
     "description": "Naples, Metropolitan City of Naples, Italy", 
     "id": "b2aaa9753e7bab447d0a3f71a2336c8bb96c3cac", 
     "matched_substrings": [ 
     { 
      "length": 6, 
      "offset": 0 
     }, 
     { 
      "length": 3, 
      "offset": 37 
     } 
     ], 
     "place_id": "ChIJ6_p622YIOxMRfriMZcxDOtI", 
     "reference": "ClRCAAAA6jM0wQfsTkmn2G9JhSrJK1XN5mdK0nFiE_iNiSpmOpzWV9E5cE7Bn5hnxEZy7EfQrTm5uDagf82Sjc-6wBhd7ZtYgLUXArJNYcI1WogVH6USEGz0Cao3FSrzmLlNiP5zhqAaFKa_hu7uIBoAvErvdqhSfF-r7QfZ", 
     "structured_formatting": { 
     "main_text": "Naples", 
     "main_text_matched_substrings": [ 
      { 
      "length": 6, 
      "offset": 0 
      } 
     ], 
     "secondary_text": "Metropolitan City of Naples, Italy", 
     "secondary_text_matched_substrings": [ 
      { 
      "length": 3, 
      "offset": 29 
      } 
     ] 
     }, 
     "terms": [ 
     { 
      "offset": 0, 
      "value": "Naples" 
     }, 
     { 
      "offset": 8, 
      "value": "Metropolitan City of Naples" 
     }, 
     { 
      "offset": 37, 
      "value": "Italy" 
     } 
     ], 
     "types": [ 
     "locality", 
     "political", 
     "geocode" 
     ] 
    }, 
    { 
     "description": "Napoli, Metropolitan City of Naples, Italy", 
     "id": "4d33ea47519b8f9c04635b1a9bae12f04197b99d", 
     "matched_substrings": [ 
     { 
      "length": 6, 
      "offset": 0 
     }, 
     { 
      "length": 3, 
      "offset": 37 
     } 
     ], 
     "place_id": "ChIJRw3rhP-wOxMRP2qkGuYBOxo", 
     "reference": "ClRCAAAAZZJtsiAUKI1qcM0-X_srZwzECGVTK4FtCwEVnUxa7xZJOV5VIyjYDXjqZ6miFEQ1_-yge9sGrbYsQAxOUgriaYZj1juHpRJiKijVRFztW40SEFtfe85oDpHJndMpB2KVxw4aFFKZyol4j79xsZ6f6GlA9osp-uSh", 
     "structured_formatting": { 
     "main_text": "Napoli", 
     "main_text_matched_substrings": [ 
      { 
      "length": 6, 
      "offset": 0 
      } 
     ], 
     "secondary_text": "Metropolitan City of Naples, Italy", 
     "secondary_text_matched_substrings": [ 
      { 
      "length": 3, 
      "offset": 29 
      } 
     ] 
     }, 
     "terms": [ 
     { 
      "offset": 0, 
      "value": "Napoli" 
     }, 
     { 
      "offset": 8, 
      "value": "Metropolitan City of Naples" 
     }, 
     { 
      "offset": 37, 
      "value": "Italy" 
     } 
     ], 
     "types": [ 
     "locality", 
     "political", 
     "geocode" 
     ] 
    } 
    ], 
    "status": "OK" 
}

你可以看到它返回了我同一個城市有不同的地點id，名稱，座標但類型相同。爲什麼這個？

來源

2017-02-14 Qu4sar