Elevation_map_local and elevation_map_global

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Hi all!

I'm referring to the parameters found in hector_elevation_mapping. What is the difference between elevation_map_local and global? Currently my elevated map and form according to the depth image my camera produces. I'm trying to find a way to save the elevated wall or update the surrounding rather than refresh according to the camera's view.

I was thinking maybe I should publish elevation_map_global to hector_elevation_visualization instead of publishing elevation_map_local. However, I tried changing the parameter in .cpp and .launch file to /elevation_map_global rather than /elevation_map_local, hector_elevation_visualization is still taking in /elevation_map_local.

Thanks for any advice!