 31.25037814985572, 120.421142578125, 31.259769987394264);
            const material = new THREE.MeshBasicMaterial();
            const terrain = threeLayer.toTerrain(extent, {
                texture: `https://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/${z}/${y}/${x}`,
                image: './data/terrain-rgb.png'
            }, material);
            threeLayer.addMesh(terrain);
            terrain.on('dataerror', function (e) {
                console.log('dataerror', 