How to locate robot position on map using map -> base_link transform?

asked 2014-04-26 10:14:10 -0500

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I'm running turtlebot in playground world and navigation

roslaunch turtlebot_gazebo turtlebot_playground.launch
roslaunch turtlebot_gazebo gmapping_demo.launch

In my program code I successfully subscribe to /map topic and process its data as 2D array[height][width] of wall coordinates, but I'm unable to interpret results of

listener_.lookupTransform( "map", "base_link", ros::Time( 0 ), transform );

How to compare results of map array and map->base_link transform?

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Why we should compare the results? since it is giving relative robot position.....

RB ( 2014-05-05 03:26:57 -0500 )edit

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answered 2014-04-26 22:04:28 -0500

INait

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Found the answer myself.

I need to use map_metadata to get map configuration with the real world.

Cell where the robot situated is ( robot_position - map_origin ) / map_resolution, for x and y coordinates accordingly.

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Don't forget to mark this as the accepted answer.

Tom Moore ( 2014-04-28 05:52:28 -0500 )edit

I don't have enough karma to do that.

INait ( 2014-04-29 00:55:21 -0500 )edit

I took care of it for you. And you should have enough karma now.

tfoote ( 2014-04-30 23:00:42 -0500 )edit

You are calculating robot position, but in your answer, you used again robot position??Can you please explain a little bit..I have posted a similar kind of question...http://answers.ros.org/question/161326/rosrun-tf-tf_echo-map-base_link-vs-coding-implementation/ .Please have a look....

RB ( 2014-05-05 03:29:14 -0500 )edit

Sorry for late response, I see in your question that you found solution, is there something left uncleared?

INait ( 2014-05-06 00:48:37 -0500 )edit

@INait, now everything is ok..

RB ( 2014-05-06 01:17:35 -0500 )edit

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How to locate robot position on map using map -> base_link transform?

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