How to use JS and Baidu Maps to implement map heat map function

How to use JS and Baidu Maps to implement the map heat map function

Introduction:
With the rapid development of the Internet and mobile devices, maps have become a common application scenarios. As a visual display method, heat maps can help us understand the distribution of data more intuitively. This article will introduce how to use JS and Baidu Map API to implement the map heat map function, and provide specific code examples.

1. Preparation work:
   Before you start, you need to prepare the following items:
2. A Baidu developer account, create an application, and obtain the corresponding API Key.
3. A basic HTML page used to display maps and heat maps.
4. Introduce Baidu Map API and Heat Gallery:
   Introduce the relevant script files of Baidu Map API and Heat Gallery in the tag of the HTML page. The code is as follows:

<script src="http://api.map.baidu.com/api?v=2.0&ak=你的API Key"></script>
<script src="http://api.map.baidu.com/library/Heatmap/2.0/src/Heatmap_min.js"></script>

Please replace "your API Key" with your own API Key.

3. Create a map:
   Use the BMap.Map() method of Baidu Map API to create a map object and set its center point and zoom level. The code is as follows:

var map = new BMap.Map("mapContainer");
var point = new BMap.Point(116.404, 39.915);
map.centerAndZoom(point, 15);

Please replace "mapContainer" with the ID of the

tag used to display the map in your HTML page.

4. Add a heat map overlay:
   Use the BMapLib.HeatmapOverlay() method provided by the heat library to create a heat map overlay object. The code is as follows:

var heatmapOverlay = new BMapLib.HeatmapOverlay({
  radius: 20
});
map.addOverlay(heatmapOverlay);

You can adjust the radius of the heat map by setting the radius attribute.

5. Set heat map data:
   Call the setDataSet() method of the heat map object and pass in an array containing data points to set the heat map data. The format of data points is {lng: longitude, lat: latitude, count: thermal value}. The code is as follows:

var data = [
  {lng: 116.404, lat: 39.915, count: 10},
  {lng: 116.414, lat: 39.915, count: 20},
  {lng: 116.404, lat: 39.925, count: 30},
  // 其他数据点...
];
heatmapOverlay.setDataSet({data: data, max: 100});

Please provide the correct data point array according to actual needs.

6. Rendering heat map:
   Call the show() method of the heat map object to render the heat map. The code is as follows:

heatmapOverlay.show();

7. Conclusion:
   At this point, you have successfully implemented the map heat map function using JS and Baidu Map API. I hope this article can help you. If you have any questions or doubts, please leave a message for discussion.

The above are the detailed steps and sample code on how to use JS and Baidu Maps to implement the map heat map function. Hope it helps readers. If readers want to know more about map heat maps, they can refer to the official documentation of Baidu Map API. I wish readers success in achieving their goals during the development process!

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