How to load a map in the hector_slam for the resumption of the hector_slam in uncharted areas

[amburkoff]

On the first day, using hector_slam, I create a corridor map and save it via map_saver.
On the second day, I need to load the map into the hector_slam and continue creating the map in the unexplored rooms.
If I upload a map to hector_slam using map_saver, it will simply be erased.
How to save a map from hector_slam so that it can be loaded back into it and continue research in unknown areas?

[skohlbr]

This is currently not merged into master branches, but you could check out #45 which appears to provide this functionality.