1.Global Mapper 将dsm先转点云分类树木房屋后生成等高线：https://www.bilibili.com/video/BV1V5411Q7Fv/
2.35_Global mapper专业版GlobalMapper_从入门到入土教程_用GM分类Lidar点云提取...：https://www.bilibili.com/video/BV16u411r76M/
3.GlobalMapper 1 —点云分类-提取地面点云：https://www.bilibili.com/video/BV1nm4y1F7jR/