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The NavSatFix message uses NaNs to represent altitudes that aren't available from the sensor. Originally posted by Tom Moore with karma: 13689 on 2014-11-24 This answer was NOT ACCEPTED on the origi …

process from a ROS node, are there some built-in ros api I can use ? … Is this an existing process/program, or just a non-ROS class? You can always wrap your non-ROS classes in ROS if you want to pass data to them. …

I’d have to see a bag to be sure, but your IMU covariance matrices are definitely ill-conditioned. Try to invert a 3x3 matrix where all the values are the same: https://m.matrix.reshish.com/inverse.p …

I also note that you are using ROS noetic; perhaps the package hasn't been updated to support it yet. In any case, the package author suggests that you can e-mail him directly in the README. …

I can answer more definitively if you provide the information I requested in the comment above, but I can probably guess what's wrong anyway. You have two_d_mode enabled, which means you need to provi …

Does ROS internally do some kind of one-to-one mapping between topic types and callbacks, or is there clearly some kind of error in how I'm handling the subscription? … Originally posted by Tom Moore on ROS Answers with karma: 13689 on 2013-08-01 Post score: 0 Original comments Comment by thebyohazard on 2013-08-01: Nope, I use one cb for multiple subscribers in quite …

Ah, I wasn't watching rosbag. It was telling me that a topic that I thought was one type was actually another. It works now. Thanks! Originally posted by Tom Moore with karma: 13689 on 2013-08-01 Th …

I believe ardrone_autonomy has already been converted to a catkin package, and has been released for ROS Indigo. Just enter sudo apt-get install ros-indigo-ardrone-autonomy into a terminal. …

The only real difference between them is that TransformStamped has a child_frame_id field, and PoseStamped doesn't. This implies that the former specifies a transform from the header's frame_id to ch …

This came up recently in a drivers sig discussion. The question I asked was that if sensor is measuring pose data in some world-referenced frame, but is mounted on the robot with some static offset ( …

How does the package handle multiple sensors of the same type (10 IMUs for instance) if one of the sensors is publishing a grossly erroneous value compared to the other sensors? Does it do some form …

You need a velocity reference. r_l is not good at working with only pose + acceleration data. It's going to be integrating the acceleration from the IMU and causing the velocity estimate to grow very …

I haven't formally announced this yet, but you might want to try this: http://wiki.ros.org/robot_localization It will let you choose to only use parts of your sensor messages. Originally posted by T …

It's the tf frame that all positions/measurements that you see are relative to. For example, let's say you have a robot that has two frames, odom (a world-fixed frame) and base_link (the body frame o …

This may help: http://docs.ros.org/indigo/api/catkin/html/howto/format2/system_library_dependencies.html As may this: http://answers.ros.org/question/118231/how-to-add-non-cmake-based-libraries-to-a- …