Questions tagged [data]

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How should a small robotics startup go about building a data platform?

We're a small company making ROS based robots that rely heavily on SLAM and perception. We're looking for a data platform solution, something like Foxglove or formant.io as a base data management tool,...
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Migrating ROS Noetic rosbags to ROS2

I want to use a dataset that has collected Bags of trajectory data, namely the MuSoHu dataset. In its dependencies, it states that a ROS Noetic installation is required. In the scope that I want to ...
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How to find formating for rosmsg publishing on command line

I want to publish messages to my robot in order to get it to move in the command line but I can't figure out how to format the rostopic pub /topic /type . I'm having issue with the data and how to ...
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rviz Fixed frame error No TF Data

i tried to visualize a UM7 Sensor from Redshift Labs ! with rotopic list i receive my /imu/data ! with rostopic echo i receive all my needed Data ( the Orientation of the Sensor ) and i can include ...
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ROS2 Performance: rclpy is 30x-100x slower than rclcpp

Hi there, TL;DR: Publishing a typical 10MB Pointcloud on a very fast system takes only 2.8 ms in rclypp but 92 ms in rclpy. We observed significant latency/performance problems when publishing large ...
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Simulating real camera data

Hi guys, Is there a way I can simulate camera data similarly to how rosbag works? I tried rosbag but was missing tf data so that didn't work. is it as simple as adding another topic to record? looking ...
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Create Data Conversion Package C++!

I have a problem with this tutorial about creating a header file. I do not understand what I should do and how should I do that. Can anyone give a clue? Or some ...
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Reading a string from a node

def callback(data): ...
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It is possible to data from topics in xslx file?

I had read subscriber to recieve data and now curious about save that data instead of real time in xslx format (not using bag files). Are there any ways to do it? Originally posted by Sol on ROS ...
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Where to store calibration data?

I have a list of integers, returned from my IMU, that represent calibration settings. I need to load these into the IMU on every power-up. Since the settings are unique to my IMU, I don't want to ...
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Is it possible to send data to ROS from a machine not running ROS

My problem is as follows: I need image capture from the screen of a Mac, which doesn't run ROS well (or at all from what I can really tell). I basically need to pass in the current screenshot of the ...
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2 answers
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How do I average 60 values published values from a node

Hello, Is there a way I can take 60 values from a topic and calculate the average after every 60 values. I'm working with GPS and the accuracy is about 3 meters. So I'll get readings that are ~3 ...
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Dropping data at high frequency(50 -100 hz)

Hi every body, I am collecting the data of two drones using vicon bridge. This package is only installed in unbuntu laptop. And I just subscribe the topic /vicon/..., used tf::transformstamped. And ...
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node doesn't work after running rosrun

I'm using a package named robot_localizaton offered by ROS downloaded from github.Here's the problem: I put a couple lines of code to export position data,it goes like this: "cout<<"...
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Can see topic published but cannot see anything when we echo the topic

I am working on a tele-operation mode of a mobile robot, from a control station. The control station and the robot is connected to the same WIFI network and both can ping to each other. The problem ...
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Imu data about xsens_driver

when i got the sensor_msgs::Imu data by adding listener to the topic, but before i use the imu data, how could i judge the imu.linear_acceleration or imu.angular_velocity is valid or available. i saw ...
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how to save the displaying map and plotted data in rviz on an image file

Hey All, I use rviz for visualization of path planning. How do I save the displaying map and plotted paths traversed by the robot on an image file like png or jpeg? I need to import the plotted data ...
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How to assign Vector3 value to Float64

I am trying to assign vector3 value to a Float64 variable as my function accepts Float64 arguments. It gives following error ...
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Rviz | tf | scan - (No transform to fixed base)

Hello all, I'm facing issues with scan data visualization on rviz. The following pictures show the problem: image 1 image 2 As we can see from image 1, the transformation between the laser and ...
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Rviz data Saving format

Hi I would like to know how to save Rviz results in text file or any other format.Could any body give me feedback. Screenshot from 2016-06-24 11_44_20.png I want to save these x,y,z and alpha,...
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Interpreting /scan topic values using Hokuyo wrapper

Hi, I am using Hokuyo UST 10LX Lidar. I have downloaded the wrapper and I am able to get scan data on /scan topic. But the values from lidar does not match with the actual distance between the ...
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Sacn Topic interpretation

Hi, Can I know how to interpret lidar data obtained on scan topic. I am using Hokuyo UST-10LX. Are the published values in cms or m ? I could not get this from the datasheet. Thanks in advance. ...
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Hokuyo LIDAR data on Graphical Interface

Hi, I have connected to Hokuyo UST -10LX lidar using ROS. I have installed the necessary wrapper and I could see that Lidar is working properly. When I do rosrun urg_node urg_node _ip_address:="...
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rviz fixed frame no tf data

Ubuntu 14.04 with Indigo destop full installed. roscore & rosrun rviz rviz then in Rviz, ...
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how to get real-time access to grid data from map generated by gmapping?

Hello everyone, I'm trying to simulate robot exploration in gazebo using gmapping. Now I'm able to generate the map using SLAM and save it using map_server. I would like to ask how do I get access to ...
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Data from the encoder

How to get the motor shaft turning data from the encoders, located inside the robot base using C ++ or Python? Give a link to the answer if this question has been, please. Originally posted by ...
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How to convert 2d lidar data to 3d point cloud data. the laser range finder i am using is the Hokuyo URG-04LX Scanning Laser Rangefinder

2d lidar data to 3d point cloud data. Originally posted by mllmjk on ROS Answers with karma: 1 on 2015-11-22 Post score: 0 Original comments Comment by Akif on 2015-11-23: Please state your problem ...
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1 answer
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Using the same data structure in multiple nodes

I am designing a system which consists of multiple nodes. Among others there is a "gui" node for visualization and a "controls" node for controlling the whole application. During ...
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1 answer
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read raw_image compressed uint8[] data

Hello everybody! I'm trying to read the datas of the "sensor_msgs/CompressedImage" message in a c++ program. Therefore I want to read the uint8[] data array. While using the callback ...
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2 answers
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lots of nan data when convert pointcloud2 to pcl::PointXYZ

HI all, I use Ubuntu 14.04 LTI with ROS Indigo. Then I simulate kinect in Gazebo: ...
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How to Monitor the data transfer

Hi everyone, I would like to know how to monitor all the data transfer between ros. There are two computers connected by using same roscore master. I want to measure the amount of data transfering ...
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1 answer
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how to force hector slam to set robot position?

hi we have a hokuyo laser and in the first seconds of running hector slam specially when the robot's laser data is few(for example in small places) the robot position has very bad data jumps , but ...
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how can i fake sensor data?

i wonder ho i can fake sensor data sdi12 serial and write ros node for it. Because i dont have any hardware to work with Originally posted by dmngu9 on ROS Answers with karma: 150 on 2015-02-02 Post ...
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ROS Package to filter raw IMU data (Linear Acceleration/Angular Velocity/Magnetic Orientation)

I'm going through the ROS packages for a generic package that will take raw IMU 9DOF readings and perhaps use a Kalman filter to fuse data from the Accelerometer, Gyroscope, and Magnometer. So far I'...
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2 answers
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Can I get data from ros to a file?

Hi I'm running Ubuntu 12.04 and ros hydro, I'm curently playing around with an ar drone with the tum_ardrone package. I wanted to know if theres a way to output data to a text file? I know I can use ...
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1 answer
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Binary data representation in messages

Is there a documentation on how the information transferred in ros messages is stored in the message's binary data (given that I have the describing msg file) ? E. g. if I would want to create my own ...
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1 answer
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get old data of tf

Dear ros-users, is there a way of access old data of tf? I mean, when I lookup for a transform, I need the latest data together with second to last, third to last.. I'm working with tf on ros fuerte ...
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1 answer
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How to get the trajectory data?

Hi, everyone, I want to get the trajectory data to analyze and control the robot, but i don't know how to get them. I did planning in the window of the planning_scene_warehouse_viewer. Thanks for your ...
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1 answer
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How to teleop pioneer3?

Hi ROS-users, I have some.. Hardware: Pioneer3, SICK-lms200, laptop, 2 usb-serial cables Software: ros-hydro-desktop-full on laptop running ubuntu-12.04. sicktoolbox(works fine) Objectives: 1. To ...
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Appropriate way to store data

Hello. I should to store a lot of different data and history of measurements in some storage (data from MS Kinect, ultrasonic sensor, odometry and, for example, data from infrared sensor. Sensors may ...
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1 answer
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How to fake the data of 2D laser scanner?

It seems that all these kind of sensors are expensive. I wanna understand SLAM by implementing at least "fake" data. I have a point in a virtual environment (OpenGL) represents the position ...
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1 answer
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How to get pitch and yaw angle from the raw IMU data?

Hello Im using the IMU data for some orientation platform purpose. Im able to use the IMU in a ROS massagesses in the Callback like these ...
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1 answer
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Real time data analysis, any tools or package inside ROS?

Hello Im wondering is there any tools or some packages inside ROS that permit real-time data analysis. I have used ROS in our mobile device , but I need to perform some online (real-time) analysis of ...
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Localization and mapping using RGB-D sensor?

Hello I would like to use a RGB-Sensor for example the Asus Xtion Pro Live Sensor that have Infrared Projector, RGB Camera and IR camera that combine depth data and visual information for fast robot ...
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programatically create subscribers

I am trying to make a simple logger that given a list of topics via a service or an action, subscribes to and logs the data from these topics. This requires me to initiate subscribers on the fly and ...
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1 answer
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bag file request

I'm working on a project that requires collecting a large set of data; anything from a few hours to a week's worth of scan (sensor_msgs/LaserScan) and tf (tf/tfMessage) topics, preferably recorded ...
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1 answer
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Primesense Data Format

Hello, I have successfully built the OpenNI package on the QorIQ processor platform. The QorIQ prcessor of Freescale ia based on the e500v2 core. I used the USB part of the OpenNI to configure and ...
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Information on message sensor_msgs/Imu

Hi guyz, I am new with ROS, and I am trying to use the output of the hector_mapping and my IMU data and fuse them into the robot_pose_ekf filter. I wanted to have more information on the message units ...
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writing first node, have some questions about the Subscriber

I'm writing my first node and there are a few things that I don't quite understand and am looking for some clarification. (This node will read Float64 messages from the /phidgets_ros/interface_kit ...
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The roll of IMU in robot pose estimation

Hello I would like to ask whats the roll of IMU in the lokalisation . I mean why and how to use IMU in the motion estimation with EKF or AMCL (particle filter) Thanks Originally posted by Astronaut ...
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