path planning for turtlebot3_navigation package

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Thanks alot. I know the difference between local and global planner. I want to know how can i see which global planner is used by a package. i am using turtlebot navigation package with turtlebot3_navigation an move_base launch files in whichi only see base local planner and DWA planner. Where is global planner ?

If a planner is not specified in launch file, then default one is used, which in case of move_base is GlobalPlanner. Within base_node you can pass both local and global planner as following, and also load their configurations using rosparam.

<param name="base_local_planner" value="dwa_local_planner/DWAPlannerROS"/>
<param name="base_global_planner" value="global_planner/GlobalPlanner" />

http://wiki.ros.org/global_planner

This is the global planner by default? if yes, then it is using dijkstra algorithm to find the path or its modified version? If modified version, then where can i see the documentation? Also if use_dijkstra=false, it uses A, so this means it can use both dijkstra or A depending upon configuration?

Yes it is default one. And depending on your configuration you can either use dijkstra or A. And I don't know about dijkstra but I think it is using some variant of A (if memory serves me right). And only paper I could find is here. Maybe you can add an issue on github and ask there for info and if there is some paper available explaining implementation.

ok. thanks alot