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Here is an example launch file that you can use:

<launch>
  <arg name="my_namespace"           default="spencer/perception_internal/people_detection/laser_front" />
  <node ns="$(arg my_namespace)" name="urg_node" pkg="urg_node" type="urg_node" output="screen">
    <remap from="scan" to="laser"/>
  </node>
</launch>

The output (remapped) topic should have the namespace appended like this:

/spencer/perception_internal/people_detection/laser_front/laser