PTV VISUM教程-8-第八讲-如何利用openstreetmap免费资源
https://www.bilibili.com/video/BV1rA411V7JB?aid=332769936PTV官网课程讲义：链接：https://pan.baidu.com/s/1nTMq9Seq4HDDgU2OVXceUg 提取码：m2wv 复制这段内容后打开百度网盘手机App
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