Questions tagged [coordinate]

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How does one obtain coordinantes from a map that was mapped by turtlebot in Rviz?

Is there a way to obtain coordinates from a map in Rviz? I tried using the code "rostopic echo /amcl_pose" to fnd its current position but that didnt work. Thats because a certain topic ...
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robot axes in wrong position

imported robot model from solidworks and now axes is wrong position ,how to correct it ? here is my urdf file ...
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What is the mean of "transform_tolerance" param?

Hello, I'm following the guide from costmap_2d for studying. On section 5 (TF), there is the sentences. "In order to insert data from sensor sources into the costmap, the costmap_2d::...
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Producing an X any Y coordinate from a Lidar sensor

The project I am working on needs to track a ball on a 10' by 10' platform. I need to produce coordinates with the 2d lidar sensor I have. The sensor I have available to me is a Sick TIM561. The ...
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Combine two parent-child transformations for common link

I am trying to connect two tf trees via a known link by following the advice from @tfoote here. One link belongs to the robot tf tree and the other belongs to a camera tf tree that is not part of the ...
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`tf static_transform_publisher` removes link instead of linking two tf trees

When using static_transform_publisher, attempting to link to coordinate systems via a common frame the publisher removes the link from one tree and places it in the ...
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Is the .bt Octomap preserving the coordinates of the ROS environment it has been built from?

I think the title is self-explicative. I constructed an Octomap out of a robot moving in a simulated environment. In that environment, the coordinate (x1, y1, z1) with respect to the world frame was ...
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Georeferencing map coordinates

I was wondering how ROS handles georeferencing of map coordinates. My robot currently sets its position when it starts up as position 0.0. However this doesn't give any information about where I am in ...
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Coordinate system in ROS

ROS operates in the ENU Coordinate system(East-North-Up). In the algorithms for AUV(Autonomous Underwater Vehicles), I need North-East-Down Coordinate system. What should I do? Change TF or what? ...
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sw_urdf_exporter preview and sw crash

When I have finished to specify link and joint at sw_urdf_exporter plugin, while other settings are set to be automatic, I click preview. The green process in the bottom loads a while and SW crashes ...
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invert an coordinate axis with tf

The coordinate of my robot and the bundled API is x -> forward y -> right z -> down I want to map such that my base_link is the following ...
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Confused about coordinate frames. Can someone please explain?

I've read: http://wiki.ros.org/navigation/Tutorials/RobotSetup/Odom http://www.ros.org/reps/rep-0105.html http://ros.org/wiki/tf http://wiki.ros.org/tf/Design However I'm still quite confused about ...
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Native spherical (WGS84) coordinates?

(this is a cross post from answers.gazebosim.com) I'm looking to build a simulation where I can accurately bookkeep my robots position in geodetic coordinates (WGS84 datum). Unfortunately the ROS+...
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Occupancy Grid Coordinates

Hi, This might be a newbie question but i need a help with it or at least to be pointed in the right direction. I need to extract/acquire the (x, y) coordinates of a given map's (grid) cells to be ...
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ERROR: Laser has to be mounted planar

Hi, I'm using Ubuntu 14.04 and ROS indigo. I published the TF using static_transform_publisher from tf package. Using the following tag to publish the transformation between the base_link and the ...
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Robot coordinates in map

Hi, I am developing an exploration algorithm based on frontier exploration. In my code, I am subscribing to the topic /map and then I am processing the ...
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Get (x,y) coordinates of an obstacle from a map

Hello all, I need help, Can someone tell me how to get the (x,y) coordinates of an obstacle from a 2d map created with gmapping. I'm working with a Turtlebot robot, ROS Fuerte in Ubuntu. After ...
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Is PR2 also follow DH Convention?

I found weird things. I open rviz for PR2. We can see that in /base_link, z axis is blue. But why left arm joint axis is not blue but green? Is PR2 follow DH convention? If not, how to understand the ...
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Getting RGB's pixel related coordinate in pointcloud (real world) with openni

Someone knows how to discover the pointcloud "pixel"(x,y,z in real world) giving a pixel (v,u) from RGB camera? I am using a feature descriptor (ORB) in RGB frame (/camera/rgb/image_color) ...
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Tf from optical frame to odometry frame

I am acquiring point cloud and image data from Kinect sensor. The coordinate frame for the data acquired is:- X axis--> right Y axis--> downwards Z axis--> forward and the odometry(standard /...
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kinect 3D data coordinates

I have a Question. pleaes tell me the answer~ kinect 3D data has the X,Y,Z coordinates. Where is the X,Y,Z data's (0,0,0)? kinect sensor? kinect lens? Originally posted by ha on ROS Answers with ...
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kinect's the world coordinate

kinect 3D point has the world coordinate (x,y,z). where is the the origin of the world coordinates(0,0,0)? Originally posted by hahaha on ROS Answers with karma: 1 on 2012-07-12 Post score: -1 ...
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