How to use JS and Amap to implement the location heat map function

How to use JS and Amap to implement the location heat map function

With the popularity of the Internet and mobile devices, people’s demand for geographical location information is getting higher and higher. . Location heat maps can visually display the heat distribution of various locations in a certain area, helping us better understand data and trends. This article will introduce how to use JS and Amap to implement the location heat map function, and provide specific code examples.

1. Preparation
Before implementation, we need to complete the following preparations:

1. Register an AutoNavi open platform account and apply for relevant API
2. Introduce the JS file of Amap API
3. Prepare the location data you need

2. Code implementation
The following are the specific code implementation steps:

1. Create a div element that holds the map

   <div id="map" style="width: 100%; height: 600px;"></div>

2. Introduce the JS file of the Amap map

   <script src="https://webapi.amap.com/maps?v=1.4.15&key=你的API Key"></script>

   Please change the "your Replace "API Key" with the API Key you applied for on the Amap Open Platform.

3. Initialize the map

   <script>
    var map = new AMap.Map('map', {
        zoom:12,
        center: [116.397428, 39.90923],
        resizeEnable: true
    });
   </script>

   Replace [116.397428, 39.90923] in the above code with the coordinates of the initial center point of the map you need, and adjust the zoom of the map as needed level.

4. Introducing the heat map plug-in

   <script src="https://webapi.amap.com/loca?v=1.3.0&plugin=AMap.Heatmap"></script>

5. Creating a heat map layer

   <script>
    var heatmap;
    map.plugin(["AMap.Heatmap"], function() {
        heatmap = new AMap.Heatmap(map, {
            radius: 25,
            opacity: [0, 0.8]
        });
    });
   </script>

   The radius and radius of the heat map can be adjusted as needed transparency.

6. Load and display heat map data
   Suppose your location data is stored in an array, and each element contains the longitude, latitude and heat value of the location. We can load the data in the array onto the heat map layer through the following code:

   <script>
    var heatmapData = [
        {lng: 116.418261, lat: 39.921984, count: 10},
        {lng: 116.417516, lat: 39.921499, count: 11},
        // 其他地点数据...
    ];
    heatmap.setDataSet({
        data: heatmapData,
        max: 100
    });
   </script>

   Please make corresponding modifications based on your own location data.

3. Summary and Outlook
This article introduces how to use JS and Amap to implement the location heat map function, and provides specific code examples. By using the API and plug-ins provided by Amap, we can easily display the heat distribution of geographical locations on the web page. In practice, we can further combine other technologies and functions, such as data visualization, search, etc., to meet different needs. I hope this article was helpful to you, and I wish you success in implementing location heatmap functionality!

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