Crowdly

odom is mobile and map is fixed.

map is fixed and odom can be fixed or mobile.

both of them are mobile.

The default frame for the Map Server to publish the loaded map in is...

"map"

"base_scan"

"odom"

"base_link"

In a map, the image describes the occupancy state of each cell of the world in the color of the corresponding pixel.

In the standard configuration, which color corresponds to which state?

Unknown

Occupied

Free

The odom frame is useful as an accurate, short-term local reference.

True

100%

False

Indicate the direction of each axis according to the ROS standard.

One of Matt Mason's funny ideas is that "each of us has an inner robot", which means that:

almost all of the required brain activity is subconscious.

all of the planning brain activity is not conscious.

almost all of the cognitive activity in the brain is unconscious.

none of the required brain activity is conscious.

Select all the nodes that are started by navigation_launch.py in nav2_bringup:

nav2_map_server / map_server

nav2_recoveries / recoveries_server

nav2_waypoint_follower / waypoint_follower

nav2_planner / planner_server

nav2_bt_navigator / bt_navigator

nav2_amcl / amcl

nav2_controller / controller_server

nav2_lifecycle_manager / lifecycle_manager

Mark the correct sentences about the ROS2 Actions.

Similar to services, while the action is being performed an action server sends progress feedback to the client.

Actions are not useful when a response may take a significant length of time.

Actions allow a client to cancel the request before it completes..

Similar to services, action clients send a request to an action server in order to achieve some goal and will get a result.

A ROS2 Lifecycle Node is in "Unconfigured" state and it executes the "configure()" method successfully. Which is the new state of the node?

In ROS, the Map Server...

...implements the server for subscribing to a map topic.

...implements the server for defining a map parameter.

...implements the server for publishing a map topic.

...implements the server for calling a map service.