使用Open Layers聚类指定最小聚类大小

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/ol@latest/dist/ol.css" type="text/css">
<script src="https://cdn.jsdelivr.net/npm/ol@latest/dist/ol.js"></script>

var map = new ol.Map({
  target: 'map-container',
  view: new ol.View({
    center: [0, 0],
    zoom: 10
  })
});

var clusterSource = new ol.source.Cluster({
  distance: 40, // 聚类的距离阈值
  source: vectorSource // 要聚类的要素源
});

var clusterLayer = new ol.layer.Vector({
  source: clusterSource,
  style: function(feature) {
    var size = feature.get('features').length;
    var style = new ol.style.Style({
      image: new ol.style.Circle({
        radius: 10 + size, // 根据聚类中要素数量设置圆点的半径
        fill: new ol.style.Fill({
          color: '#ff0000' // 圆点的填充颜色
        })
      }),
      text: new ol.style.Text({
        text: size.toString(), // 显示聚类中要素数量的文本
        fill: new ol.style.Fill({
          color: '#ffffff' // 文本的填充颜色
        })
      })
    });
    return style;
  }
});

map.addLayer(clusterLayer);