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robot_localization: navsat_transform_node runtime error

asked 2021-05-13 12:03:19 -0500

yefty gravatar image

updated 2021-05-13 18:32:40 -0500

jayess gravatar image

Hello all.

I have cloned the most up to date version of the robot_localization package from the GitHub repository. I experience a runtime error as I attempt to run the navsat_transform_node. This is the output:

terminate called after throwing an instance of 'rclcpp::exceptions::ParameterAlreadyDeclaredException'
what(): parameter 'broadcast_utm_transform' has already been declared
  • Operating System:

Ubuntu 20.04.2 LTS

  • Installation type:


  • Version or commit hash:


  • Steps to reproduce issue:

    git clone -b foxy-devel

    colcon build --packages-select robot_localization

    source install/setup.bash

    ros2 run robot_localization navsat_transform_node

  • Expected behavior

    The node will run without a runtime error

  • Actual behavior

    Node crashes with the following console output:

    terminate called after throwing an instance of 'rclcpp::exceptions::ParameterAlreadyDeclaredException'

    what(): parameter 'broadcast_utm_transform' has already been declared

Any help on this matter would greatly appreciated.

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1 Answer

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answered 2021-05-14 11:48:18 -0500

djchopp gravatar image

Have you opened this up as an issue on the github page for this package? What I am about to explain is more properly placed there.

The issue is on lines 110-120 of navsat_transform.cpp

broadcast_cartesian_transform_ =
  this->declare_parameter("broadcast_utm_transform", broadcast_cartesian_transform_);

if (broadcast_cartesian_transform_) {
    this->get_logger(), "Parameter 'broadcast_utm_transform' has been deprecated. "
    "Please use 'broadcast_cartesian_transform' instead.");
} else {
  broadcast_cartesian_transform_ =
    this->declare_parameter("broadcast_utm_transform", broadcast_cartesian_transform_);

We can see that if the broadcast_utm_transform parameter is false, it will be declared on both the first statement and in the else branch.

If I had to guess on the intent of the code, the else branch should look more like this:

} else {
  broadcast_cartesian_transform_ =
    this->declare_parameter("broadcast_cartesian_transform", broadcast_cartesian_transform_);

(the name of the parameter should be different)

To jump passed this without modifying code, pass it true for broadcast_utm_transform parameter with:

ros2 run robot_localization navsat_transform_node --ros-args -p broadcast_utm_transform:=true

Please either open an issue on the github page, or let me know if you are not going to so I can.

Hope this helps!

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Thanks for the descriptive answer! Works like a charm and makes perfect sense. Originally I was just going to file a bug report but as I was going to, this message popped up:


So I was just making sure I was covering my bases first. Your answer has convinced me to file a bug report. Thank you very much.

yefty gravatar image yefty  ( 2021-05-14 16:20:02 -0500 )edit

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Asked: 2021-05-13 12:03:19 -0500

Seen: 56 times

Last updated: May 14