Clarification please local and global costmaps

Hi All,

this quote is not clear for me
“Note that the static_map parameter is set to False. This is because the local costmap is built from the laser readings, not from any static map”

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Although the sentence makes sense in the context of local planner but Where is False set here ? I do not see how the map is static except in the costmap_common_params.yaml in where it’s set to True by the way.

the same applies here:
“Note that the static_map parameter here is set to True. This is because the global costmap is built from the static map you created in the previous steps.”

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My guess is that for both quotes it refers to the “rolling window”.
in the global_costmap_params. yaml, the map is statically loaded as a global “reference” somehow and it makes sense that here the rolling window is set to False
But when the local_planner uses the segmented maps (provided by the global_planner, the sensor readings are done dynamically , thus the rolling window is set to true.

Can somebody clarify please?

Hello @r2s.sugreev,

Yes, you are totally right. Those quotes are quite confusing here. As you said in your post, we are using the rolling_window parameter here to differentiate between the local and global costmap usage. Also, note that in the global costmap parameters we are loading the costmap_2d::StaticLayer plugin (which will manage the conversion from the static map to the costmap), while in the local costmap we are not.

I will update the notebook in order to better explain this part.

Best,