Hi,
In the case of SLAM with lidar Scans, the SLAM algorithm takes in lidar scans and attaches them to a node in an underlying pose graph. The algorithm then correlates the scans using scan matching. It also searches for loop closures, where scans overlap previously mapped regions, and optimizes the node poses in the pose graph.
The MapResolution means Resolution of the occupancy grid map. Meaning if the MapResolution is set to 20 then it means 20 cells per meter.
Hope this helps!
