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...
View ArticleEditing gmapping caused a problem
I have edited my gmapping node to always publish zero transform from map to odom (reason being that map -- > odom keeps violently changing when I spin my lidar which causes the robot to jump around...
View ArticleLookup 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...
View ArticleHokuyo 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. -...
View Articlelocalization 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 the...
View ArticleAMCL warning: no laser scan received
Hello, i'm really new in ros, so here's my question: With AMCL how do i localize the robot? I got the following warning continually on amcl node: [ WARN] [1425574394.999492201]: No laser scan received...
View ArticleLaser scan posting frequency
Is there a minimum frequency (i.e. samples per second or even seconds between samples) of laser scan data posts required to properly generate a ros bag file used to generate a successful map using...
View ArticleUsing 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...
View Articlegmapping error:Scan Matching Failed, using odometry
i am using gmapping to build a map with rplidar and turtlebot,but get error messages like:Scan Matching Failed, using odometry. Likelihood=.....and build a bad map in rviz. the bad map like : ![image...
View ArticleHow 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...
View ArticleWhat's the difference between "laser" and "scan" of tf
When I write the above. I'm not clear about the names of tf frames, especially for the "laser". Is this argument always like this even if my sensor topic is "/scan" ? Does it mean the frame name is...
View ArticleHow 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...
View ArticleHow to write subscriber to detect obstacle in front of Hokuyo LiDAR
I would like to write a subscriber which is responsible to read ROS message and is being published through /scan topic (Hokuyo). It should be very straight forward like if there is any obstacle or...
View Article"no map received" in RVIZ, how to create map? I only got real time info in rviz
I'd like to create 2D or 3D map in RVIZ using Kinect v1. I have Kinect v1 connect to Raspberry Pi2 (ubuntu 14.04, ROS indigo). And Ubuntu 14.04 local machine. ROS_XXXs are all set correctly. On...
View ArticleLaser_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:...
View Articlei m new to c++ and ros and want to build my own mapping algorithm using laser...
i have recently started working on ros and just built one code that subscribes laserscan msgs and convert them to x y and z coordinate. Now i want to print the pointcloud in rviz and use it in scan...
View ArticleGmapping creates an overlapping map
I'm trying to build a 2D map using Velodyne VLP-16, I have the csm, ICP scan matcher working but when I try to build a map using gmapping, it creates a overlapping map, I'm using the...
View ArticleGmapping in largely empty space
I am trying to run gmapping in a large empty space with hokuyo utm-30lx. The problem is that most of the readings on /scan is inf and gmapping is not mapping that as empty space, even though I have the...
View ArticleMessages being blocked from publishing
I am running 2 nodes. One is polar_scan_matcher and the other one is my own node that publishes scan messages. Something is wrong somewhere because when the 2 nodes run at the same time, the publisher...
View ArticleCan 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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