How to use Python and Baidu Map API to obtain POI points in a specific administrative area?

How to use Python and Baidu Map API to obtain POI points in a specific administrative area?

Geographic information and location data play an increasingly important role in modern society. Obtaining POI (points of interest) information in a specific administrative area can provide a lot of help for various application scenarios. This article will introduce how to use the Python programming language and Baidu Map API to obtain POI points within a specific administrative area.

Before we start, we need to prepare some tools and resources. First, we need a Baidu Maps developer account and create an application to obtain the keys needed to access the API. Secondly, we need to install Python's requests library, which is used to send HTTP requests to obtain API data. Finally, we also need boundary data for an administrative region, which can be obtained from various map data providers, such as Baidu Maps, Amap, etc.

First, we need to obtain the boundary data of a specific administrative region, which can be used to construct the polygon of a region. Here, we assume that we already have polygon coordinate data containing a specific administrative area, and we can use these coordinates to construct a polygon object. The following is a sample code that uses Python's Shapely library to create a polygon object:

from shapely.geometry import Polygon

# 行政区域的边界坐标
region_boundary = [(116.327158, 39.990912), (116.327510, 39.987176), (116.322296, 39.985177), (116.319754, 39.987376), (116.321070, 39.989070), (116.327158, 39.990912)]

# 创建行政区域多边形对象
region_polygon = Polygon(region_boundary)

Next, we need to use the Baidu Map API to obtain POI points within a specific administrative area. Baidu Map API provides a Place API, which can obtain POI data based on specified keyword searches and specific location searches. The following is a sample code using Baidu Map API:

import requests

def search_poi(keyword, region):
    # 百度地图Place API的请求网址
    url = "http://api.map.baidu.com/place/v2/search"

    # 请求参数
    params = {
        "query": keyword,
        "region": region,
        "output": "json",
        "ak": "your_api_key"  # 替换为你的API密钥
    }

    # 发送HTTP GET请求
    response = requests.get(url, params=params)
    result = response.json()

    # 处理返回结果
    if result["status"] == 0:
        # 返回POI点结果列表
        return result["results"]
    else:
        # 返回空列表
        return []

# 搜索包含“餐厅”的POI点
keyword = "餐厅"
region = "北京市"
poi_list = search_poi(keyword, region)

# 打印POI点信息
for poi in poi_list:
    print("名称：", poi["name"])
    print("地址：", poi["address"])
    print("经度：", poi["location"]["lng"])
    print("纬度：", poi["location"]["lat"])

In the above code, we define a search_poi function that receives keywords and administrative regions as parameters and returns a List of eligible POI points. We can call this function to search for POI points within a specific administrative area. In the sample code, we search for POI points containing the keyword "restaurant" and print out the relevant information.

In summary, by using the Python programming language and Baidu Map API, we can easily obtain POI point information in a specific administrative area. This provides great convenience for developing location-related applications and services. I hope this article can help you understand how to use Python and Baidu Map API to obtain POI points in a specific administrative area.

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