hector_slam问题汇总（更新中）

1. [ERROR] []: Transform failed during publishing of map_odom transform: Lookup would require extrapolation into the future. Requested time 1512355460.650420421 but the latest data is at time 1512355460.113152033, when looking up transform from frame [base_link] to frame [odom]
   解决方法：
   Hector_mapping 导致 tf 转换错误
   如何使用 hector_mapping 和激光雷达进行映射

• 存疑点：在真实机器人上是否有必要保留base_footprint坐标系？