get the yaw angle between two frames
I have two frames, one is global frame, another is UAV frame. And i also have the transform between them. how to get the yaw angle between global frame to UAV frame , So i can know the angle between...
View ArticleAdd a tf frame in a simulator
Hi, all. I want to add a frame between "odom" and "base_footprint" in a simulator by imitating [navigation_stage](http://wiki.ros.org/navigation_stage). Then it is connected to...
View ArticleCalibrating Laser Scanner Transform
Hey, I work with a robot that is equipped with a 2D Laser Scanner. And actually its pretty hard to measure the distance from the center of the rorbot to the center of the Laser Scanner accurately by...
View ArticleUsing map for pose estimation
Hello, Quite a newbie question, but I can't understand the right way to do things properly. (I'm using groovy under Ubuntu 12.04). I want to get a position and orientation estimations of my PR2 robot...
View ArticleHow to update map to odom with corrections from SLAM ?
Our basic goal is to publish a map to odom transform that corrects for the drift of our odometry. We have a localization algorithm that uses landmarks to give an absolute position wrt the map frame....
View ArticleHow do you use inverseTimes()?
How do you use inverseTimes? From reading the docs, it looks like it should be a member function of Transform(), and take another Transform() as the argument. However, the following code: from...
View ArticleHow to put a launch file?
Hi all. I'm trying to create a launch file as part of Hokuyo TF. Credits to Malefitz for the codes. However, I'm wondering where should I copy the .launch file to. Thanks for any help!
View ArticleErrors in RVIZ and Static Transform Publisher with Hokuyo
I managed to use Hokuyo laser to scan the area and display on the grid. However I still encounter some problems such as: TF /map: Warning TF /my_frame: Warning Map: Warning I'm not sure what I missed...
View ArticleNeed help with hector slam tf
Hi all. I have successful set up my Hokuyo UST-20LX to do laser scanning. I'm currently trying to use the hector_slam package now. However, I have problems regarding the tf. Using rosrun tf...
View ArticleCurrent position with Dynamixel servomotor AX12
Hi friends I am working with Dynamixel servomotor A12 and ROS fuerte, I need to get a pan and tilt and when I do transforms I need to know which is the current position of 2 motors. I don't know if the...
View ArticleTransform (TF) coordenates from world to base_link
Hi Ros users. I would like to make a transform. Now i am subscribing to world velocities but I want to subscribe to base_link velocities. How can I make a transform between these two coordenates? Thanks
View ArticleYet another tf problem
Doing this : print self.tf_listener.lookupTransform("/map", "/camera_frame", rospy.Time(0)) pose_camera_frame.header.stamp = rospy.Time(0) pose_world_frame = self.tf_transformer.transformPose("/map",...
View ArticleAdding roll and pitch from offset IMU to base frame
The ground usually isn't completely flat, so what I like to do is add a roll and pitch from an IMU to correct the laser scan frame before using it for gmapping and amcl. I was planning to use...
View ArticleRosserial_Arduino Time and TF Tutorial: Buffer Underfill Error
I am attempting [tutorial 4](http://wiki.ros.org/rosserial_arduino/Tutorials/Time%20and%20TF) of the [Rosserial Arduino tutorials](http://wiki.ros.org/rosserial_arduino/Tutorials) and I keep getting...
View ArticleTranslation of pose to a point 500 mm in front of the AR tag
I'm using AR-tags to automatically detect locations to visit using AMCL navigation. When I receive the ar_pose_marker event I transform it to the odom frame and save this for navigation later on. The...
View ArticleTransformPointCloud invalid argument error
void callback(const QuaternionStampedConstPtr& quaternionS, const PointCloudConstPtr& pointcloud) { scan_in = pointcloud; angle_in = quaternionS; to_apply =...
View Articlelibgazebo_ros_openni_kinect.so depth pointcloud wrong tf
Hello, I am new to ROS. I am trying to simulate a robot in gazebo witch works fine for now, but I have a problem with simulating a kinect camera. The simulated data seems to be right, but when I try to...
View ArticleBest practices for pose/vector transformations
Hello everyone! This is more of a discussion than a question needing a specific answer. I couldn't find a similar question, so here: I've written a flight simulator with critical performance...
View Articlespecific odom frame responsibility
I am trying to understand the responsibility I have with regards to publishing the odom TF frame. Specifically, we have a mobile robotic system that is intended to (and does) operate via ROS and are...
View ArticleTf has two or more unconnected trees
Hi friend. I have a problem. I want to run my bag file with Karto. So I use static transform publisher to connect frames. My frames.pdf is here:  I set the...
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