[ros-users] sensor_msgs::LaserScan Multi-echo Laser Review

[Martí Morta]

Hi Chad,

In the IRI's hokuyo laser driver [1] we are using the first method, 
multiecho data is not in every value received, they vary from 1 to 3 
echoes, so the "/laser/echoN" in our case is the echoes "N" + the first 
value in the case that there's no "echo N".

I have the feeling that most users plug and play and won't care much 
about echoes, so I prefer a single topic with an optional policy (keep 
the max, the min,..):

Advantages:
- Efficient (good for ros)
- No needs synchronization (good for ros & user)
- Single topic (good for user)
- No need to change the message type (good for ros & user)
Disadvantages:
- User can't work with separated echo data without modifying the code 
(bad for few users)
- Policies have to be decided beforehand and implemented in the driver 
(work for the coder)

For me its not clear how this multiecho should be used, we don't use it. 
Know how people work with this multiecho data would be great to define 
the policies.

Out of topic, is the ROS hokuyo_node going to work with ethernet lasers?

[1] http://www.ros.org/wiki/iri_hokuyo_laser

Cheers,

Martí

On 07/19/12 03:45, Chad Rockey wrote:
> Hi everyone,
>
> As part of the Groovy planning process, I've posted a review for 
> multi-echo laser rangefinders:
> http://www.ros.org/wiki/sensor_msgs/Reviews/2012-08-01_MultiEchoLaser_API_review_API_Review
>
> This review focuses on the ROS API for scanners that return multiple 
> ranges (and intensities) for a single beam.  Example lasers with this 
> feature are the SICK LMS151 and LMS511, as well as the Hokuyo 
> UTM-30LX-EW.
>
> Please take a look and contribute your thoughts.
>
> Thanks,
>  - Chad
>
>
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-- 
Martí Morta Garriga. Support Engineer.
Institut de Robòtica i Informàtica Industrial (UPC-CSIC)

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