Steps to implement map drawing and marking point functions using Python and Baidu Map API

Steps to implement map drawing and marking point functions using Python and Baidu Map API

Introduction:
Map drawing and marking points are commonly used functions in many application fields, such as geographic information systems, business analysis, etc. . This article will introduce how to use Python and Baidu Map API to implement map drawing and marking points. Through the study of this article, you will master how to use Python to write code, call Baidu Map API to generate a map, and add markers on the map.

Step 1: Register a Baidu Map developer account and create an application
First, we need to register a Baidu Map developer account and create an application. Enter the official Baidu Map developer website (https://lbsyun.baidu.com/), click the "Console" button in the upper right corner, and then follow the instructions to complete the steps of registration and application creation.

Step 2: Obtain the key of Baidu Map API
After creating the application, we need to obtain the key of Baidu Map API. In the console, click "Application List", find the application you just created, then click "Manage", find "Key Management" in the left navigation bar, and copy "Key (AK)".

Step 3: Install the necessary Python libraries
Enter the following command in the command line window to install the required Python libraries:

pip install baidu-aip
pip install requests
pip install matplotlib

Step 4: Write code to implement map drawing and marking points
The following is a sample code that uses Python and Baidu Map API to implement map drawing and marking point functions:

import requests
import matplotlib.pyplot as plt

# 设置地图的中心位置和缩放级别
center_lng, center_lat = 116.403694, 39.927552
zoom_level = 15

# 获取地图图像
map_url = f"http://api.map.baidu.com/staticimage/v2?ak=<your_ak>&center={center_lng},{center_lat}&width=600&height=400&zoom={zoom_level}"
map_img_data = requests.get(map_url).content

# 保存地图图像
with open('map_image.png', 'wb') as f:
    f.write(map_img_data)
    
# 在地图上添加标记点
markers = [(116.403694, 39.927552), (116.391278, 39.90761), (116.419348, 39.914956)]
for marker in markers:
    marker_lng, marker_lat = marker
    plt.scatter([marker_lng], [marker_lat], c='red', marker='o')

# 显示地图
plt.imshow(plt.imread('map_image.png'))
plt.show()

In the code, we first define the center position and zoom level of the map. Then, use the requests library to send an HTTP request and call the Baidu Map API interface to obtain the map image data. Next, we save the image data as a local file, then use the matplotlib library to display the map and add marker points to the map.

In line 7 of the code, you need to replace <your_ak></your_ak> with the Baidu Map API key you obtained in step 2.

Step 5: Run the code and view the results
After running the above code, you will get an image window containing the map and marker points.

Conclusion:
This article introduces how to use Python and Baidu Map API to implement map drawing and marking point functions. By studying the steps and sample code in this article, you can easily implement similar functions in your own applications and customize and extend them according to actual needs. I hope this article can help you better master the use of Python and Baidu Map API.

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