function createBottomSurface() {
    console.log("***********createBottomSurface()点坐标****************" + tempPoints[0].lon+tempPoints[0].lat+tempPoints[0].hei);
    //获得裁剪处最低点坐标高度
    var minHeight = getMinHeight(tempPoints).minHeight;
    console.log("*************createBottomSurface()的最低点**************" + minHeight);
    //将存储坐标点push进bottomPos数组
    for (var i = 0; i < tempPoints.length; i++) {
      bottomPos.push(tempPoints[i].lon)
      bottomPos.push(tempPoints[i].lat)
      bottomPos.push(minHeight-depth)
    }
    console.log("**********************createBottomSurface()底部坐标：***************************" + bottomPos);
    //添加底面贴图
    var polygon=new Cesium.PolygonGeometry({
      polygonHierarchy:new Cesium.PolygonHierarchy(
        Cesium.Cartesian3.fromDegreesArrayHeights(bottomPos)
      ),
      perPositionHeight:true
    })
    const geometry=Cesium.PolygonGeometry.createGeometry(polygon)
    const material=new Cesium.Material({
      fabric:{
        type:‘Image‘,
        uniforms:{
          image:‘../../static/Images/bottomImg.jpg‘
        }
      }
    })
    const appearance=new Cesium.MaterialAppearance({
      translucent:false,
      flat:true,
      material
    })
    viewer.scene.primitives.add(new Cesium.Primitive({
      geometryInstances:new Cesium.GeometryInstance({
        geometry
      }),
      appearance,
      asynchronous:false
      })
    )
  }