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function getHeightByLngLat(viewer, lng, lat) {
        var height = 0;
        var cartographic = new Joint3d.Cartographic.fromDegrees(lng, lat);
        if (!Joint3d.BaseLib.defined(cartographic)) {
            return height;
        }
        try {
            height = viewer.scene.sampleHeight(cartographic);//获取给定点的3DTiles高度
            if (height == undefined || height < 0) {//没有3DTiles
                height = viewer.scene.globe.getHeight(cartographic);//获给定点的地形高程
                if (height == undefined || height < 0 ) {//没有地形
                    height = 0;
                }
            }
        }
        catch (err) {
            height = viewer.scene.globe.getHeight(cartographic);//获给定点的地形高程
            if (height == undefined || height < 0 ) {//没有地形
                height = 0;
            }
        }
        return height;
    };