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2016-04-27 17:29:37 -0500 answered a question What does the point data in topic velodyne_points represents and how can we use this data in custom program for getting depth of objects?

I assume the velodyne_points topic you are talking about is coming from the Velodyne driver. This publishes PointCloud2 data. If you use the rostopic tool, you can see the data format to understand it better. Essentially, it is an array of "x, y, z, intensity, laser number" points. So if you are trying to determine depth, you would need to play with algorithms on this 3D point cloud output.

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2012-06-21 15:48:19 -0500 commented question OSX Fuerte rosdep install -a fails on pcl

I can comment out the offending EmPy dependency, but catkin still fails on the git fetch. Not sure what to do about that. I had similar problems in Electric with certain rviz dependencies not installing due to missing repos or similar. I was hoping rviz new Qt dependency would help.

2012-06-09 07:56:38 -0500 asked a question OSX Fuerte rosdep install -a fails on pcl

I followed the Homebew OSX instruction till the rosdep install -a line. Everything worked pretty well and many of the rosdep packages are successful. But when it gets to pcl, it all fails and I can't figure out how to get around the errors. This is the output:

executing command [brew install ros/fuerte/pcl] ==> Installing pcl dependency: catkin Unsatisfied dependency: EmPy Homebrew does not provide Python dependencies; install with: easy_install EmPy ==> Cloning git://github.com/wg-debs/catkin.git Updating /Library/Caches/Homebrew/catkin--git fatal: remote error: Repository not found. Error: Failure while executing: git fetch -q origin ERROR: the following rosdeps failed to install homebrew: command [brew install ros/fuerte/pcl] failed

Even after I install EmPy using pip or easy_install, brew install catkin still fails to find that dependency. And I have no idea why the git repo of catkin is failing.

Any help would be awesome.