====== Using ROS Launch ======

Normally this is used to start nodes based on a launch file.

Normal Usage:
  roslaunch <PACKAGE> <LAUNCH_FILE>
  
==== Listing the Nodes Launched ====

This will list the nodes that a launch file will run on stdout.

  roslaunch <PACKAGE> <LAUNCH_FILE> --nodes
  
==== Topic Remapping/Argument Replacement ====

This allows for changing the topic that a node publishes or subscribes to. This is really useful when using image_view. 

  roslaunch <PACKAGE> <LAUNCH_FILE> <ARG>:=<NEW_VALUE> <TOPIC>:=<NEW_TOPIC>