如何使用Google Nearby API获取指定半径内的周边城市？

我正在开展一个项目，需通过经纬度（lat,long）获取设备位置20公里范围内的所有城市（locality），且设备所在的locality不能出现在结果中。我并非开发者，在Postman中调用Google Places Nearby Search接口，仅得到2个结果，远少于预期的10余个。

当前调用的请求（已隐藏密钥部分）：

https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=48.7707452,2.0803735&radius=20000&type=locality&key=AIzxxxxxxE

返回的JSON结果：

{"html_attributions": [],"results": [{"geometry": {"location": {"lat": 48.801408,"lng": 2.130122},"viewport": {"northeast": {"lat": 48.82857804347341,"lng": 2.168480543860636},"southwest": {"lat": 48.77916591232869,"lng": 2.069908968772275}}},"icon": "https://maps.gstatic.com/mapfiles/place_api/icons/v1/png_71/geocode-71.png","icon_background_color": "#7B9EB0","icon_mask_base_uri": "https://maps.gstatic.com/mapfiles/place_api/icons/v2/generic_pinlet","name": "Versailles","photos": [{"height": 3024,"html_attributions": ["<a href=\"https://maps.google.com/maps/contrib/116593793480207812084\">Jessy Velazquez</a>"],"photo_reference": "AUjq9jkmbt7CKGCwJfn3ZlpLVC-wGt_1svXYWTyA5p9pgcmd6XCNbEcwAFFjF0xe2tuLIYm5F_42s0Q4dbI0ifJTHZy5-gfzQfSo2jMp_ATL-WfPl3jJHf8WbnRVLSslBCKg3j5jYQBU2pkyb2Tjkk7PLZSGSuv9ycLQu-j2zTBWUM9x-ejT","width": 4032}],"place_id": "ChIJvSD0dbR95kcRukqEDa0AnoY","reference": "ChIJvSD0dbR95kcRukqEDa0AnoY","scope": "GOOGLE","types": ["locality","political"],"vicinity": "Versailles"},{"geometry": {"location": {"lat": 48.7738734,"lng": 2.0360157},"viewport": {"northeast": {"lat": 48.7992215538692,"lng": 2.055979168810353},"southwest": {"lat": 48.75589319907799,"lng": 1.994393632933018}}},"icon": "https://maps.gstatic.com/mapfiles/place_api/icons/v1/png_71/geocode-71.png","icon_background_color": "#7B9EB0","icon_mask_base_uri": "https://maps.gstatic.com/mapfiles/place_api/icons/v2/generic_pinlet","name": "Montigny-le-Bretonneux","photos": [{"height": 4160,"html_attributions": ["<a href=\"https://maps.google.com/maps/contrib/100080658394344210444\">ali imoune</a>"],"photo_reference": "AUjq9jn0-yeBGJe57tERWIrudEEdhV_zdqrrtGna1VvH-vI33q2FMfh7c_YaZpK4VXR1eWFhU7MYt0rhxZujTMnM3DL7F5vOXX0zepVThDaB_I5gZ0Io2RjnXbYh4ZDInZ-0aXDY-w4xdisBO_4oAAVgot1516GAbE-He8jvgCacDUcp03w1","width": 3120}],"place_id": "ChIJDxMIwS-B5kcRHthZxYnQcNo","reference": "ChIJDxMIwS-B5kcRHthZxYnQcNo","scope": "GOOGLE","types": ["locality","political"],"vicinity": "Montigny-le-Bretonneux"}],"status": "OK"}

1. 理解Nearby Search的结果逻辑 #

Nearby Search不会返回所有符合半径条件的locality，它优先展示人口多、知名度高的区域，且默认最多返回20条结果。如果结果超过20条，会返回next_page_token用于分页获取更多，但你的返回里没有这个token，说明Google判定当前范围内只有这2个高优先级的locality。

2. 改用反向地理编码+文本搜索组合 #

如果需要更全面的区域列表，可以按以下流程操作：

• 先通过反向地理编码获取设备所在的locality名称，方便后续排除：

  https://maps.googleapis.com/maps/api/geocode/json?latlng=48.7707452,2.0803735&result_type=locality&key=你的API密钥
  

• 再用文本搜索（Text Search）指定区域搜索locality，之后手动过滤掉设备所在的那个：

  https://maps.googleapis.com/maps/api/place/textsearch/json?query=locality&location=48.7707452,2.0803735&radius=20000&key=你的API密钥
  

  也可以把query换成city，可能会匹配到更多小区域。

3. 调整搜索半径或范围 #

适当扩大半径（比如到25公里），可能会返回更多周边区域，之后再通过结果里的经纬度计算实际距离，过滤掉超过20公里的结果。

4. 检查类型参数是否准确 #

确认type=locality是你需要的层级，有时候administrative_area_level_3这类更细的行政层级，可能对应更多小区域，可以尝试替换类型参数试试。

内容的提问来源于stack exchange，提问作者Farid SISSINHO