cesium计算边界，cesium根据经纬度点数据集，计算边界

 let data = [
          {x:106.6567310, y: 29.5018702, value: 20},
          {x:106.6552488, y: 29.5006757, value: 50},
          {x:106.6411832, y: 29.4938576, value: 80},
          {x:106.6404616, y: 29.4924980, value: 40},
          {x:106.6421648, y: 29.4954613, value: 100},
        ];

        //将所有点位组装-计算边界值
        let bpoint = [];
        for (let coord of data) {
         console.log('coord',coord)
          bpoint.push(new Cesium.Cartographic(coord.x, coord.y, 0))
        }
        let bound = new Cesium.Rectangle.fromCartographicArray(bpoint);//计算所有点位的边界
        console.log('bound',bound);
        //将所有点位组装-计算边界值---完