Python programming practice: steps to implement administrative region division using Baidu Map API

Python Programming Practice: Steps to Implement Administrative Region Division Using Baidu Map API

In recent years, with the rapid development of Internet technology, Geographic Information System (Geographic Information System, referred to as GIS) has been widely used. Among them, administrative region division is an important part of GIS. Using the map API, the division and query of administrative regions can be easily realized. This article will use the Python programming language, combined with Baidu Map API, to introduce the steps to implement administrative region division, and attach corresponding code examples.

1. Preparation

First, we need to register a Baidu developer account and obtain the corresponding ak key. The ak key is an identifier for using the Baidu Map API, through which you can access Baidu Map services. After the registration is completed, you can create a new application in the developer console and obtain the corresponding ak key.

2. Import the necessary libraries

In Python, we need to import the corresponding libraries to handle HTTP requests and parse JSON data. The following are commonly used libraries:

import requests
import json

3. Send HTTP request

Using the Baidu Map API, we can send HTTP requests to obtain data divided by administrative regions. The following is a code example for sending an HTTP request:

def get_district_data(keyword):
    url = 'http://api.map.baidu.com/place/v2/search'
    params = {
        'query': keyword,
        'region': '全国',
        'scope': '2',
        'page_size': 20,
        'output': 'json',
        'ak': 'your_ak'
    }
    res = requests.get(url, params=params)
    data = json.loads(res.text)
    return data

In this code example, we use the "location retrieval" function of Baidu Map API to obtain data for administrative regions. Among them, the keyword keyword is used to specify the administrative area that needs to be queried, and ak is the ak key we obtained during the preparation work.

4. Parsing JSON data

After obtaining the HTTP response, we need to parse the returned JSON data and extract the administrative region information we need. The following is a sample code for parsing JSON data:

def parse_district_data(data):
    districts = data['results']
    for district in districts:
        name = district['name']
        location = district['location']
        print(name, location)

In this code example, we use Python’s dictionary type to parse JSON data. By calling the get method of the dictionary, we can extract the 'results' item in the data dictionary, and then traverse the administrative region information in it. For each administrative region, we can obtain its name and coordinate location by extracting the 'name' and 'location' items.

5. Calling example

Through the above code example, we can realize the function of dividing administrative regions. The following is a calling example:

data = get_district_data('北京')
parse_district_data(data)

In this example, we first call the get_district_data method, and the parameter is the name of the administrative region. Then, pass the returned data to the parse_district_data method to parse and print out the name and coordinate location of the administrative region.

Summary

This article introduces the steps of using Baidu Map API to implement administrative region division, and provides corresponding Python code examples. Through the above steps, we can easily complete the division and query of administrative regions, which provides convenience for the development of geographic information systems. I hope this article will be helpful to GIS developers in practice.

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