Ask Your Question

StevenJiang's profile - activity

2016-12-28 00:51:11 -0500 received badge  Notable Question (source)
2016-12-28 00:51:11 -0500 received badge  Famous Question (source)
2015-08-20 15:48:07 -0500 received badge  Popular Question (source)
2015-06-28 21:38:45 -0500 commented question Error in running the Demo for hector Quadrotor

Hi, have you solved the problem? I think I have got the same problem here.

2015-06-24 21:00:50 -0500 received badge  Famous Question (source)
2015-05-27 02:45:11 -0500 received badge  Notable Question (source)
2015-05-25 05:35:11 -0500 asked a question laser_filters cannot be found

Hi,

I am a newbie to ROS and I want to use some of the built-in filters to process the laser scan.

I installed the filters package before and I double checked today by typing: sudo apt-get install ros-indigo-laser-filters

it said:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
ros-indigo-filters is already the newest version.
ros-indigo-filters set to manually installed.
The following packages were automatically installed and are no longer required:
  libgcal0 linux-headers-3.13.0-32 linux-headers-3.13.0-32-generic
  linux-image-3.13.0-32-generic linux-image-extra-3.13.0-32-generic
  ros-indigo-shape-tools
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 20 not upgraded.

So the filters should have been installed right?

However, when I open the laser_filters folder in opt/ros/indigo/shared/, there are only a cmake folder and two xml files. From the tutorial there should be a "examples" folder inside the laser_filter folder.

Can anyone tell me if the laser_filters package was correctly installed? Where can I find the package?

Thanks in advance.

2015-05-22 11:04:38 -0500 received badge  Famous Question (source)
2015-05-22 07:38:29 -0500 received badge  Notable Question (source)
2015-05-19 12:12:59 -0500 received badge  Popular Question (source)
2015-05-08 02:05:29 -0500 asked a question Hokuyo_node tutorial error

Hi,

I followed the exact steps on http://wiki.ros.org/hokuyo_node/Tutor...

Everything showed up as expected until I reached the final step, which is rosrun rviz rviz -d rospack find hokuyo_node/hokuyo_test.vcg

I got an error: ERROR: the config file '/opt/ros/indigo/share/hokuyo_node/hokuyo_test.vcg' is a .vcg file, which is the old rviz config format. New config files have a .rviz extension and use YAML formatting. The format changed between Fuerte and Groovy. There is not (yet) an automated conversion program.

I tried to change the command to rosrun rviz rviz -d rospack find hokuyo_node/hokuyo_test.rviz, rviz did launch, but I just could not change the fixed frame to '/laser' in the global options, the fixed frame is 'map' when rviz launched.

Can anyone please give me some advice?

Thanks. Steven

2015-05-03 20:49:39 -0500 received badge  Popular Question (source)
2015-04-30 02:17:12 -0500 received badge  Enthusiast
2015-04-29 00:33:28 -0500 received badge  Scholar (source)
2015-04-28 22:06:08 -0500 commented answer Nothing shown in rviz when doing hector_slam mapping tutorial

Ok it worked! Thanks a lot! But when I added a map by types, there is no map showing. What is the difference between topics and types?

2015-04-27 21:08:10 -0500 received badge  Notable Question (source)
2015-04-27 06:18:54 -0500 commented answer Nothing shown in rviz when doing hector_slam mapping tutorial

Hi, thanks for replying.

The default setting in Global Options is 'map' which I assume is the correct one? However there is nothing shown on the grid.

Sorry I don't understand what 'Map -- /map (add using Topic and add /map)' mean (I am a newbie in ROS). Could you elaborate a bit more?

Thanks.

2015-04-26 23:04:08 -0500 received badge  Popular Question (source)
2015-04-25 08:35:49 -0500 commented question Cannot run the mapping tutorial

Closed. Thanks for the reminder.

2015-04-25 07:18:50 -0500 commented answer Hector_Slam tutorial problem (Map is not created)

I also experienced the same problem. When I try to save the map, it said: [rospack] Error: package 'map_server' not found. Can anyone give me some advice please? Thanks.

2015-04-25 07:18:50 -0500 asked a question Nothing shown in rviz when doing hector_slam mapping tutorial

Hi,

Maybe my question is a bit dump because I am very new to hector slam and even to ROS. I have installed ROS and hector slam (indigo). When I was trying to do the tutorial, after I typed roslaunch hector_slam_launch tutorial.launch and press enter, Rviz started fine with no error. I can rotate the grid and saw Global Status is in red text (no data feeding into Rviz).

Then I typed rosbag play Team_Hector_MappingBox_RoboCup_2011_Rescue_Arena.bag --clock in another console and there is no error shown. I could see the [RUNNING] line being showed and I guess the data is being fed to Rviz?

However, there is nothing shown in Rviz, I can still rotate the grid but there is no map being created. Also, I saw the Global Status became green and there was a check sign. I could also see the "ROS Elapsed" at the bottom is running.

When I added a TF, I could see two coordinates moving but there is just no map.

I saved the file to an alternative path (when I clicked save it said the file cannot be open, so I have to save a copy to another path). The content of the file is shown below:

Panels:
  - Class: rviz/Displays
    Help Height: 78
    Name: Displays
    Property Tree Widget:
      Expanded:
        - /Global Options1
        - /Status1
      Splitter Ratio: 0.5
    Tree Height: 565
  - Class: rviz/Selection
    Name: Selection
  - Class: rviz/Tool Properties
    Expanded:
      - /2D Pose Estimate1
      - /2D Nav Goal1
      - /Publish Point1
    Name: Tool Properties
    Splitter Ratio: 0.588679
  - Class: rviz/Views
    Expanded:
      - /Current View1
    Name: Views
    Splitter Ratio: 0.5
  - Class: rviz/Time
    Experimental: false
    Name: Time
    SyncMode: 0
    SyncSource: ""
Visualization Manager:
  Class: ""
  Displays:
    - Alpha: 0.5
      Cell Size: 1
      Class: rviz/Grid
      Color: 160; 160; 164
      Enabled: true
      Line Style:
        Line Width: 0.03
        Value: Lines
      Name: Grid
      Normal Cell Count: 0
      Offset:
        X: 0
        Y: 0
        Z: 0
      Plane: XY
      Plane Cell Count: 10
      Reference Frame: <Fixed Frame>
      Value: true
    - Angle Tolerance: 0.1
      Class: rviz/Odometry
      Color: 255; 25; 0
      Enabled: true
      Keep: 100
      Length: 1
      Name: Odometry
      Position Tolerance: 0.1
      Topic: ""
      Value: true
    - Class: rviz/TF
      Enabled: false
      Frame Timeout: 15
      Frames:
        All Enabled: true
      Marker Scale: 1
      Name: TF
      Show Arrows: true
      Show Axes: true
      Show Names: true
      Tree:
        {}
      Update Interval: 0
      Value: false
  Enabled: true
  Global Options:
    Background Color: 48; 48; 48
    Fixed Frame: map
    Frame Rate: 30
  Name: root
  Tools:
    - Class: rviz/Interact
      Hide Inactive Objects: true
    - Class: rviz/MoveCamera
    - Class: rviz/Select
    - Class: rviz/FocusCamera
    - Class: rviz/Measure
    - Class: rviz/SetInitialPose
      Topic: /initialpose
    - Class: rviz/SetGoal
      Topic: /move_base_simple/goal
    - Class: rviz/PublishPoint
      Single click: true
      Topic: /clicked_point
  Value: true
  Views:
    Current:
      Class: rviz/Orbit
      Distance: 16.2326
      Enable Stereo Rendering:
        Stereo Eye Separation: 0.06
        Stereo Focal Distance: 1
        Swap Stereo Eyes: false
        Value: false
      Focal Point:
        X: 0
        Y: 0
        Z: 0
      Name: Current View
      Near Clip Distance: 0.01
      Pitch: 0.350399
      Target Frame: <Fixed Frame>
      Value: Orbit (rviz)
      Yaw: 0.425397
    Saved: ~
Window ...
(more)
2015-04-25 07:18:49 -0500 asked a question Cannot run the mapping tutorial

Hi,

Maybe my question is a bit dump because I am very new to hector slam and even to ROS. I have installed ROS and hector slam (indigo). When I was trying to do the tutorial, after I typed "roslaunch hector_slam_launch tutorial.launch" and press enter, Rviz started fine with no error. I can rotate the grid and saw Global Status is in red text (no data feeding into Rviz).

Then I typed "rosbag play Team_Hector_MappingBox_RoboCup_2011_Rescue_Arena.bag --clock" in another console and there is no error shown. I could see the [RUNNING] line being showed and I guess the data is being fed to Rviz?

However, there is nothing shown in Rviz, I can still rotate the grid but there is no map being created. Also, I saw the Global Status became green and there was a check sign. I could also see the "ROS Elapsed" at the bottom is running.

When I added a TF, I could see two coordinates moving but there is just no map.

Can anyone help me on this please? Thanks