Questions tagged [scan]

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Slam toolbox map jumps on linear movements

I'm running slam toolbox on iron using the default settings and am having an issue with, what I believe, is the scan matching. My robot can rotate in place and generate a map of decent quality. When ...
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Why Lidar detection range in gazebo is different from setting?

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Ubuntu 20.4/Foxy - Gazebo/Tiago : no /scan_raw topic

Following Rico's book - page 43 - (https://github.com/fmrico/book_ros2) [Ubuntu 20.04.6 LTS / Foxy] I try to run Tiago sim and drive it around a world map with the teleop launcher I run the simulation ...
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Don't see scan message on Rviz even though it's published

I'm trying to solve this puzzle. It seems to be simple but it doesn't work. So, the OdomNode is subscribed to the original LaserScan message on /sick_lrs_36x1/scan topic. It receives the message and ...
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How to visualize the laser scan data as a local/global map?

Hi, my robot in ros melodic has a lidar and I want to visualize the laser scan data. Previously I used the local_costmap, but since it became more complicated and now it consists not only of the laser ...
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Where can I find aquatic maps to explore?

Hi! Im working with the Heron simulating prototype, and what I need is to be able to use the lidar that has already in its packages. The thing is,I have manage to use it, but the ones provided by ...
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Scan data stuck at origin point

Hello, I'm a relatively new ROS user trying to get a Clearpath HUSKY to create maps using a Hokuyo LIDAR. I'm using a headless Ubunto running ROS Kinetic. I'm am able to connect and drive the system ...
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ROS remote master: can see topics but no data

Hello guys I have already read through several threads like this but couldn't figure out what my issue is.. I have a robot and a remote PC. I want to visualize the lidar data of the robot in rviz on ...
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How can I round /scan topic values?

Hello! I am student and I really want to send /scan topic values to rtabmapviz. I am using ROS kinetic, /scan is topic created by RPLidarNode. Unfortunately I think that I need rounded values, because ...
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local costmap remember past obstacles

A bit of background about my setup: I have a robot with a lidar sensor at about 4 feet off the ground and a kinect sensor at about 1.5 feet off the ground. the two sensors are directly above each ...
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point cloud in wrong position relative to robot

Hello fellow roboticists, I have been trying to get a kinect sensor working on my urdf model in gazebo. i have successfully attached the sensor thanks to my previous question here. My only issue is ...
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Not getting laser scan runing libgazebo_ros_gpu_laser plugin

Hello all, I have been following the tutorials in the book Programming Robots with ROS and I am on the part on page 306 where we create a simulation of the robots laser scanner in gazebo. My goal is ...
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"Waiting for the map" when using map_server and rosbag

Hello, I'm currently doing the tutorial teb_local_planner and now I'm trying to build a map with this tutorial. I execute all commands and at the end of this, I have problem with this command : ...
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Reading data from the shifted laser, as if it was in the middle

I have algorithms that use raw data from laser [-pi/2;pi/2]. Earlier, the laser was in the middle of the robot. Now it has been moved closer to the left front edge and rotated by pi/4. What is the ...
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No laser scan received

Hello, I know this question has been asked many times for single robot but i cannot figure it out for my multi-robot-system. Please Note: It is perfectly working for a single robot. But it is giving ...
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Why won't the /scan topic display rounded values?

Hello, I am a student at a university of applied sciences, working on a robot that uses the Hokuyo UBG-04LX-F01 LIDAR. The robot that I use runs on Ubuntu 12.0.4.5 with ROS Hydro Medusa. The LIDAR of ...
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laser scan topic

i install ros indigo desktop full and Turtlebot2 Ubuntu Package . when i do $rostopic list i cant find /laser/scan topic . there'...
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transformation the laser scan data with robot pose?

hello guys, I want to simulate the bag data that I got from ROS in MATLAB. I separated the pose and range data from the bag file. and I wrote a script to plot the laser data and build a map (I assumed ...
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Can I build instant maps from kinect

Hi all ROS is really a great stranger to me. I am using Xbox360, ROS Kinetic, Ubuntu16.04 LTS I am doing a project in which the robot should produce the map as it goes through an unknown environment. ...
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Laser_assemble for Hokuyo scans in Gazebo

Hi everyone! I'm trying to assemble some readings from a Hokuyo laser simulated in gazebo. The assembler I'm trying to use is the one you can download here: https://github.com/ros-perception/...
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How to get laser points in a specific time of a bag

I have some code that get the messages and break after there is something inside, but laser ranges data change every time I execute my code. This happens probably cause I get the msg in different ...
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What's the difference between "laser" and "scan" of tf

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Using cartographer for creating map, how?

Hello, I just installed cartographer package and I am trying to use it in order to create a map and visualise it in rviz. I am using vrep, where I have a robot with laser scan publishing data to laser ...
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localization is not working properly when robot is rotating

Hi everyone, I have problem with my robot's localization, whenever the robot is moving forward the localization is working fine and the laser scan is matching with the room boundaries(map) but when ...
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Hokuyo laser - Turtlebot costmap updation error

Hello people, We have a turtlebot(kobuki base) and have connected Hokuyo laser to it following the instructions from these links. http://wiki.ros.org/turtlebot/Tutorials/hydro/Adding%20a%20Hokuyo%...
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Lookup would require extrapolation into the past

Good afternoon, I have a problem when converting a laser scan into a point cloud map using ros indigo virtual machine. I get the following error : terminate called after throwing an instance of 'tf2::...
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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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Convert network Lidar data to LaserScan

Hi there! I am trying to stream data back from my Parrot AR Drone 2.0, which has a LIDAR attached, to my PC (which has ROS running) in order to run Hector Slam. I currently have code running on the ...
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How can I use the Hokuyo UTM-30LX via wifi?

Hi everybody, I'd like to know if there is a way to use the Hokuyo UTM-30LX via WiFi and, possibly, change the scan rate of the sensor. Thanks in advance! Originally posted by Marty on ROS Answers ...
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data format of /scan

Hi all, I'm using ROS INDIGO. I used depthimage_to_laserscan to obtain scan data. what does the values under /scan represent? is it the range from the obstacles(metres or centimetres).? Originally ...
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Any suggestions for combining scans of different frequencies?

I'm combining two scans, one extracted from a depth camera, and the other from a 2D LIDAR. But I'm getting some jitter from the depth camera's scan's contribution. I suppose it's to be expected when ...
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Not use kinect, how to show scan by rviz?

I use binocular cameras to capture images, and calculate the depth images. Now I transform depth image to pointcloud msg, I can show pointcloud by rviz. Finally, I use pointcloud_to_laserscan node to ...
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Using subscriber to subscribe the Lidar's signal Topic

Hello ROS users, I am using a subscriber to subscribe lidar's signal. I have watched the subscriber and publisher example(C++) tutorial's video and use catkin_ws to build a package, and I make a ...
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Stage navigation multiple robots

Hello, I want to have multiple robots in stage navigation. I used the stage navigation tutorial code. The problem is I can have gmapping with 1 robot. But if I include a second robot the TF doesnt ...
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2 answers
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Scan message must contain angles from -x to x

I follow the tutorial turtlebot_simulator to make a map in a simulated world.But when I run roslaunch turtlebot_gazebo gmapping_demo.launch a error that scan message must contain angles from -x to x ...
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Gazebo and move_base problem

Hello I'm using Ubuntu 12.04 and ROS fuerte I' simulating SLAM using gazebo and I followed Learning ROS book. Now I reached move_base.launch but when I run it, it gave the following errors: ...
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AMCL Localization, Drifts when turning

Hi people, I am using a differential drive robot with a sick laser scanner. When I am driving him forwards everything is fine but when I start turning the LaserScan doesnt match with the map and it ...
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2 answers
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How can I merge scan topics

Hi all! I am trying to get a map from using 2 hokuyo lidars at the same time(for a 360 degree view). So far i did 2 tries: 1)I used a launch file that uses two hokuyo_node's to publish to the same '...
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pcl for laser sensor

I'm really confused. I want to make a map of the environment by using laser scans. I know I have to use pcl, but I cannot understand what is the use of pcl does it store all the scan over a period of ...
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depthimage_to_laserscan works with rosrun but the DepthImageToLaserScanNodelet does not work properly

Hi, I have trouble with a nodelet which is responsible for converting depth image to laser scan. I have the required topics namely /camera/depth/camera_info and /camera/depth/image_raw and here is how ...
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Limit linear velocity

Hi everyone, I wrote a node that subscribes to the topic sensor_msgs/LaserScan and publishes in the topic geometry_msgs/Twist. I want to limit the maximum linear velocity that a powered wheelchair can ...
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ROS Icon: Network ID (QR CODE)

hi everyone. i'm running on Ubuntu 12.04, ROS Hydro. i've been searching for quite a few days already on how to get the ROS icon on turtlebot's computer. I'm working on Android-Turtlebot kind of thing ...
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Subscriber to /scan

This the error i'm getting for the code m writting below. I'm trying to write a subscriber to /scan and a callback function which prints the angle_min on the terminal (ranges[] later). However i guess ...
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2 answers
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Can I use a single-point laser range finder with a SLAM algorithm (not a Hokuyo-type/wide-angle type scanner)?

Hello hello, I've seen plenty of examples of building maps with ROS using Hokuyo laser scanners that can scan at wide angles (270 degrees!). However, from what I've seen, these scanners are way out of ...
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increase hokuyo URG-04LX-01 scan Frequency

How do i increase hokuyo URG-04LX-01 to scan at a higher Frequency. current it is 10Hz. i have add param name="Skip" value = "1"/ to my launch file, but a i increase the Value the ...
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Laser -> point cloud, tf drop all packages

hi, all, I am super new to ROS. I am trying to use tf to transform the laser input to tf base_link frame. But I am constantly getting error msg like "MessageFilter [target=base_link ]: Dropped ...
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NAO laser head urg_node connection problem

Hi. I'm trying to use NAO laser head with urg_node, but there is connection problem. I'm trying to connect with Ehternet and always have same problem ...
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How to show scan and map topic simultaneously in rviz

Hello, I am currently running localization in a static map using hokuyo laser range finder. I am running both amcl and laser scan matcher nodes. I would like to view the laser scan data on rviz to ...
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Problem with laser scan Hokuyo and windows/glass

Hi, I use a laser Hokuyo UTM-30LX. I use hector_slam in ROS hydro. When I use my laser in a hallway with windows, hector_mapping create a false wall some meters behind to the windows. In this video, I ...
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