gmappping problem ( NO MAP RECEİVED )

asked 2015-06-12 06:21:17 -0500

osmancns
153 ●31 ●34 ●43

updated 2015-06-12 06:24:02 -0500

Hello friends... I created required gmapping tree. But RVİZ dont display a map. I use RPLidar. I run this gmapping launch file . and ı get this error on console.

[ERROR] [1434099978.892736102]: Scan message must contain angles from -x to x, i.e. angle_min = -angle_max

And I run $roswtf , I get this error:

**WARNING The following node subscriptions are unconnected:

/rviz_1434092335500490690:
- /tf_static
- /map_updates
/slam_gmapping:
- /tf_static**

On my rviz: fixed frame : /map

this is my tree : http://i57.tinypic.com/50001f.png

this is my rviz display: http://i61.tinypic.com/2nvzf5w.png

this is my gmapping launch file:

<rosparam>
  odom_frame: odom
  map_frame: map
  base_frame: base_link
  map_update_interval: 0.5
  maxUrange: 30.0
  maxRange: 60.0
  sigma: 0.05
  kernelSize: 1
  lstep: 0.05
  astep: 0.05
  iterations: 5
  lsigma: 0.075
  ogain: 3.0
  lskip: 0
  linearUpdate: 0.5
  angularUpdate: 0.436
  temporalUpdate: -1.0
  resampleThreshold: 0.5
  particles: 80
  xmin: -1.0
  ymin: -1.0
  xmax: 1.0
  ymax: 1.0
  delta: 0.025
  llsamplerange: 0.01
  llsamplestep: 0.01
  lasamplerange: 0.005
  lasamplestep: 0.005  
</rosparam>

</node> </launch>

$ rostopic echo /odom result :

**child_frame_id: base_link pose:

pose:

position: 
  x: 2.35970327619
  y: 0.419065232983
  z: 0.0
orientation: 
  x: 0.0
  y: -0.0
  z: -0.846968362724
  w: -0.53164329446**

please ı need a hepl please help me friens.

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Comments

Are you sure the output of rplidar is correct?

Po-Jen Lai ( 2015-06-13 23:23:42 -0500 )edit

oh I am also not sure that . how can I correct that I dont know ? you think my static tf 's is correct ?

osmancns ( 2015-06-14 02:37:53 -0500 )edit

I am not sure, just feel not right with your error message. Since the scan message is incorrect, map may not be able to update. As a result, /map_updates cannot be published. I haven't met this problem before, so I'm just providing some opinion for you to debug.

Po-Jen Lai ( 2015-06-15 01:51:53 -0500 )edit

there is a solved problem this link. ı cloned new node for rplidar but no result. ı think problem is on rplidar. http://geduino.blogspot.com.tr/2015/0...

osmancns ( 2015-06-15 03:21:09 -0500 )edit

Hi, I used rpliar+gmapping for mapping. I made rplidar as one part of the virtual robot and bring up the virtual robot in Gazebo for sending TF information out. Then call slam_gmapping node, it seem there is no error to pass the code. However, the generated map is too bad. Something wrong?

rosRabbit ( 2015-08-21 00:35:44 -0500 )edit

you need to change gmapping parameters. default parameters not good for every lidar. example : http://geduino.blogspot.com.tr/2015/0... and if you will work with real rplidar you must do that : https://github.com/robopeak/rplidar_r...

osmancns ( 2015-08-21 01:06:12 -0500 )edit

I use the parameters from http://geduino.blogspot.com.tr/2015/0... . But have no idea about how to set the rplidar reference frame. Can you tell me how? The map is received but it seems there is no space occupied. Something must be wrong. Thanks!

rosRabbit ( 2015-08-21 01:42:20 -0500 )edit

The RPLidar node with fixes it is available on https://github.com/afrancescon/rplida... (with rplidar referance frame) you dont need to change referance frame. And gmapping need to odometry for a good mapping. But hector_mapping not like this. But if you work on gazebo this not a problem.

osmancns ( 2015-08-21 02:07:55 -0500 )edit

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3 Answers

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answered 2015-06-15 09:54:42 -0500

Po-Jen Lai

1361 ●35 ●43 ●61 https://www.linkedin.c...

updated 2015-06-16 05:25:28 -0500

I guess you didn't change the port in rplidar.launch.

<launch>
  <node name="rplidarNode"          pkg="rplidar_ros"  type="rplidarNode" output="screen">
  <param name="serial_port"         type="string" value="/dev/ttyUSB0"/>  
  <param name="serial_baudrate"     type="int"    value="115200"/>
  <param name="frame_id"            type="string" value="laser"/>
  <param name="inverted"            type="bool"   value="false"/>
  <param name="angle_compensate"    type="bool"   value="true"/>
  </node>
</launch>

You should use ls /dev/ttyUSB* to check what's the port of your lidar. And make sure the line below is correct.

<param name="serial_port"         type="string" value="/dev/ttyUSB0"/>

Also, check if your user is in the linux group dialout to get access to the lidar.

============================================================

Update:

I think you should first take a look at the message in your /scan topic to confirm if angle_min != -angle_max. http://docs.ros.org/api/sensor_msgs/h...

Although in http://geduino.blogspot.com.tr/2015/0... , it mentioned that

First issue regards the LaserScan expected by GMapping. Unfortunately this is not documented anywhere and I found it only checking out source code: on latest commits (not yet released) a new check was added to make sure LaserScan message min angle and max angle are opposite:

maxAngle = - minAngle

This condition is not satisfied by RPLidar node but, since released version of GMapping does not include this check, is not easy to notice.

I guess your gmapping does include this check, and since the driver didn't handle this issue, your gmapping console would complain about that.

You might need to modify the rplidar_ros/src/node.cpp to let angle_min == -angle_max and see if it works.

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thank you . But I can see rplidar /scan topic on rviz display. also rviz show my lidar lines on display .

osmancns ( 2015-06-15 14:08:56 -0500 )edit

Weird. So the error of "Scan message must contain angles from -x to x" still exist? Also, have you modified the gmapping.launch to meet the configuration in http://geduino.blogspot.com.tr/2015/0...

Po-Jen Lai ( 2015-06-16 00:05:44 -0500 )edit

sorry I couldnt understand. what will I do on node.cpp. there are angle links. How can ı modify.

on node.cpp : scan_msg.angle_min = M_PI - angle_min; scan_msg.angle_max = M_PI - angle_max;

What will ı do this links. ?

osmancns ( 2015-06-16 06:56:17 -0500 )edit

this my rplidar_ros/src/node.cpp : https://github.com/afrancescon/rplida...

osmancns ( 2015-06-16 07:50:11 -0500 )edit

I thought you are using https://github.com/robopeak/rplidar_r... , I don't get why you use this one ( https://github.com/afrancescon/rplida... ) instead.

Po-Jen Lai ( 2015-06-16 10:18:27 -0500 )edit

Anyway, I've traced the code. You can use scan_msg.angle_max = -1*(M_PI - angle_min); to replace the original scan_msg.angle_max = M_PI - angle_max;. Check if this fix the error. (Although it's a little bit weird that angle_min as the input of publish_scan() is actually 0)

Po-Jen Lai ( 2015-06-16 10:26:07 -0500 )edit

oh Thank you so much your fixing is solved the problem. I can see mapping on rviz . but map so so bad.I use your link gmapping parameters. and my odom tf and base_link tf that on rviz moving so not stable . you think what can ı do my friend

osmancns ( 2015-06-16 11:24:01 -0500 )edit

Show me your map (by http://imgur.com/ ). Have you checked if the laser scan is accurate? For example, you can put the lplidar in front of a wall and see if a line is displayed in Rviz.

Po-Jen Lai ( 2015-06-17 01:24:09 -0500 )edit

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answered 2015-08-21 04:41:52 -0500

rosRabbit
21 ●4 ●6 ●9

Hi, I account a problem when I want to generate the map using rplidar+slam_gmapping. I post the launch file here and hope you could do me a favor to see where is wrong. I am new to ros. Thanks! By the way, I describe a virtual robot in a file with a real rplidar on it. I just want to get tf data from the virtual robot and get the real data from rplidar for the finally generating map. I am not sure whether this method is right or not. If not, how to generate tf and add tf for mapping? Thanks!

</launch>

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you cannot use real lidar with gazebo. lidar and robot must move together. you can move the with your hand without gazebo. Or you can use this simulator. it is has a virtual lidar on robot: http://wiki.ros.org/turtlebot_simulat...

osmancns ( 2015-08-24 01:55:14 -0500 )edit

this is basic gmapping launch file : https://yadi.sk/d/9uup1mXnicpuc Note: it has fake odometry so it has just a tf.

osmancns ( 2015-08-24 01:58:50 -0500 )edit

Hi, Thanks! What you show above is very helpful. The gmapping launch file you given could generate the map. Thanks very much. :)

rosRabbit ( 2015-08-25 04:37:07 -0500 )edit

but it has not a odometry data. you can use " laser_scan_matcher " package for good odometry.

osmancns ( 2015-08-25 05:37:25 -0500 )edit

Thanks very much! I use "laser_scan_matcher" to get better odometry as your suggestion. Now I could get better map. Thanks again for your great help!

rosRabbit ( 2015-08-26 02:48:19 -0500 )edit

glad to be of help :)

osmancns ( 2015-08-26 03:13:29 -0500 )edit

Hi, sorry to bother you again. I have a question about the virtual sensor. As you know, it has a virtual kinect here http://wiki.ros.org/turtlebot_simulat... . My question is : is there a virtual rplidar? where to find it? Thanks!

rosRabbit ( 2015-08-27 00:42:35 -0500 )edit

there is a virtual sensor with kinect. also you can review this links : http://gazebosim.org/tutorials/?tut=a...https://www.youtube.com/watch?v=z9Pzm... there is just hokuyo gazebo models but you can edit it like rplidar parameters in sdf or xacro file.

osmancns ( 2015-08-27 01:01:36 -0500 )edit

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answered 2015-06-16 02:02:39 -0500

osmancns
153 ●31 ●34 ●43

updated 2015-06-16 06:54:02 -0500

You think , my launch is correct ? this is my gmapping launch file:

  odom_frame: odom
  map_frame: map
  base_frame: base_link
  map_update_interval: 0.5
  maxUrange: 5.5
  maxRange: 5.5
  minimumScore: 50
  sigma: 0.05
  kernelSize: 1
  lstep: 0.05
  astep: 0.05
  iterations: 5
  lsigma: 0.075
  ogain: 3.0
  lskip: 0
  linearUpdate: 0.2
  angularUpdate: 0.25
  temporalUpdate: 5.0
  resampleThreshold: 0.5
  particles: 80
  xmin: -1.0
  ymin: -1.0
  xmax: 1.0
  ymax: 1.0
  delta: 0.025
  llsamplerange: 0.01
  llsamplestep: 0.01
  lasamplerange: 0.005
  lasamplestep: 0.005

</rosparam>

</node> </launch>

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