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My question is where do you add the GPS data to fuse into the package?

In your launch file you need to remap your GPS fix topic to the input of the navsat transform.

<node pkg="robot_localization" type="navsat_transform_node" name="navsat_transform" clear_params="true">
    <remap from="odometry/filtered" to="odometry/filtered_map"/>

    <remap from "/gps/fix" to "your GPS output topic here" /> 

  </node>

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My question is where do you add the GPS data to fuse into the package?

In your launch file you need to remap your GPS fix topic to the input of the navsat transform.

<node pkg="robot_localization" type="navsat_transform_node" name="navsat_transform" clear_params="true">
    <remap from="odometry/filtered" to="odometry/filtered_map"/>

    <remap from "/gps/fix" to "your GPS output topic here" /> 

  </node>

Was that your question?

You'll also need to remap your IMU topic. The navsat node requires all three.