cartographer 保存地图


 1.   完成轨迹, 不接受进一步的数据。

rosservice call /finish_trajectory 0


2.    序列化保存其当前状态
rosservice call /write_state "{filename: '${HOME}/Downloads/mymap.pbstream'}"


3.    将pbstream转换为pgm和yaml
rosrun cartographer_ros cartographer_pbstream_to_ros_map -map_filestem=${HOME}/Downloads/mymap -pbstream_filename=${HOME}/Downloads/mymap.pbstream -resolution=0.05


    生成对应的pgm和yaml,放于${HOME}/Downloads/mymap目录下

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