Python programming skills: How to obtain POI points within a geofence based on Baidu Map API

Python programming skills: How to obtain POI points within the geographical fence based on Baidu Map API

Length: 1500 words

1. Introduction
With the development of mobile Internet, Geographical location information plays an important role in many application scenarios. Baidu Map API provides powerful functions that allow us to obtain nearby POI points according to specific needs. This article will introduce how to use Baidu Map API to obtain POI points within the geofence range, and implement it through Python programming.

2. Preparation
Before starting programming, we need to apply for our own Baidu Map API key. The specific steps are as follows:

1. Open Baidu Map Open Platform (http://lbsyun.baidu.com/).
2. Register or log in to Baidu account.
3. Enter the "Console" page.
4. Create an application and obtain the API key.

3. Coding implementation

1. Import the required Python library
   First, we need to import the required Python library, including requests and json. The requests library is used to send HTTP requests, and the json library is used to parse the returned JSON data. The code is as follows:

import requests
import json

2. Get POI points based on Baidu Map API
   Next, we need to define a function to get POI points within the geofence range through Baidu Map API. The specific code is as follows:

def get_poi_within_fence(api_key, fence, query):
    # 定义API请求的URL
    url = "http://api.map.baidu.com/place/v2/search"
    
    # 发送API请求
    response = requests.get(url, params={
        "query": query,    # 关键字查询
        "bounds": fence,    # 地理围栏范围
        "output": "json",    # 返回JSON格式数据
        "ak": api_key    # 百度地图API密钥
    })
    
    # 解析API返回的JSON数据
    result = json.loads(response.text)
    
    # 获取POI点列表
    poi_list = result['results']
    
    return poi_list

In the above code, we obtain POI points within the geofence range by defining a function named get_poi_within_fence. The function accepts three parameters: api_key is our Baidu Map API key, fence is the range of the geofence, and query is the keyword query.

3. Call the function and output the result
   Finally, we can get the POI points within the geofence range by calling the function defined above, and print the result. The specific code is as follows:

if __name__ == "__main__":
    api_key = "your_api_key"    # 替换为自己的百度地图API密钥
    fence = "39.915,116.404,39.975,116.414"    # 地理围栏范围
    query = "餐厅"    # 关键字查询
    
    poi_list = get_poi_within_fence(api_key, fence, query)
    
    for poi in poi_list:
        print(poi['name'], poi['location'])

In the above code, we first replace api_key with our own Baidu Map API key, then specify the geofence range and keyword query, and finally Loop through the results and print the name and location of the POI point.

4. Summary
Through the above steps, it becomes very simple to use Baidu Map API in Python to obtain POI points within the geofence range. We only need to define a function and pass in relevant parameters to obtain the POI point information we need. Through this method, we can fully utilize the functions of Baidu Map API in application development and improve the user experience.

5. References
[1] Official documentation of Baidu Map Open Platform. http://lbsyun.baidu.com/

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