Ask Your Question

Josper's profile - activity

2020-11-27 01:18:46 -0500 received badge  Necromancer (source)
2020-11-27 01:18:46 -0500 received badge  Teacher (source)
2020-02-06 21:25:48 -0500 answered a question What is the mean of "transform_tolerance" param?

Because sensor's data has latency. If the latency is too large, the information you get from sensor will not immediate e

2019-04-08 01:07:40 -0500 marked best answer Ubuntu which command find nothing

In ROS 2.0 tutorial : Using ament to build a custom package: Create an overlay
It says that we can use Ubuntu command which to see the path before and after we source ~/ros2_overlay_ws/install/local_setup.bash. But it just shows nothing as I typed which talker. I also tried my ros working space, it shows nothing, too. No matter I source setup.bash/local_setup.bash or not. If I type which ls, it works fine to show me /bin/ls. Although I can still run these ros package correctly, but I'm really curious to know what's wrong in my environment setting, should I set any ros environment variable to let which command works fine?

2018-10-19 00:49:37 -0500 received badge  Famous Question (source)
2018-10-19 00:49:37 -0500 received badge  Notable Question (source)
2018-09-12 11:35:59 -0500 received badge  Good Question (source)
2018-06-07 04:01:24 -0500 received badge  Popular Question (source)
2018-04-06 15:49:31 -0500 received badge  Famous Question (source)
2018-04-06 15:49:31 -0500 received badge  Notable Question (source)
2018-04-06 15:49:31 -0500 received badge  Popular Question (source)
2018-04-06 11:54:09 -0500 received badge  Famous Question (source)
2018-04-05 13:26:44 -0500 received badge  Nice Question (source)
2018-01-10 01:55:31 -0500 answered a question Ubuntu which command find nothing

I seem to find the reason, which command will search through PATH. local_setup.* and setup.* will only append ~/ros2_ove

2018-01-10 01:39:40 -0500 asked a question Ubuntu which command find nothing

Ubuntu which command find nothing In ROS 2.0 tutorial : Using ament to build a custom package: Create an overlay It says

2017-08-28 04:10:57 -0500 received badge  Popular Question (source)
2017-08-23 05:39:07 -0500 asked a question How to use gperftools to analysis my ROS code

How to use gperftools to analysis my ROS code I need to use profiling tool to analysis my ROS code. I use below command

2017-08-15 22:06:48 -0500 received badge  Famous Question (source)
2017-07-05 03:26:35 -0500 received badge  Notable Question (source)
2017-06-14 05:01:50 -0500 asked a question How to fine tune hector mapping

How to fine tune hector mapping I'm trying to use RGB-D camera + hector_mapping to build occupancy map. I found that no

2017-06-08 03:29:14 -0500 received badge  Popular Question (source)
2017-05-12 01:36:45 -0500 asked a question My hector-mapping will crash soon after start.

My hector-mapping will crash soon after start. I'm trying to use depthimage_to_laserscan + hector_mapping. But the hecto

2017-05-10 00:53:27 -0500 received badge  Enthusiast
2017-05-08 21:02:54 -0500 marked best answer I'm confused about publishing nav_msgs/Odometry message

I have some questions of the tutorial : Publishing Odometry Information over ROS to learn how to publish nav_msgs/Odometry message:
1. In this tutorial code, I'm confused about the transform part. architecture image
From the image of navigation stack, it only require "nav_msgs::Odometry". Why should we send "geometry_msgs::TransformStamped"? Since we set the same data in these two data structure.

2. Could I think the role of"odom" frame as the estimated pose of robot, and "base_link" as the origin (0, 0, 0) in the world?

3. In my robot case, I have a robot with motor encoder. Could I treat it as the odometry source just like below image?
image

4. Are the names of "frame_id" and "child_frame_id" changeable?

2017-05-08 21:02:54 -0500 received badge  Scholar (source)
2017-05-04 11:08:44 -0500 received badge  Notable Question (source)
2017-05-03 20:43:24 -0500 commented answer I'm confused about publishing nav_msgs/Odometry message

Yes, I mean tf. The tutorial says we should both send geometry_msgs::TransformStamped and nav_msgs/Odometry. But from th

2017-05-03 20:33:30 -0500 received badge  Popular Question (source)
2017-05-03 09:54:06 -0500 received badge  Student (source)
2017-05-03 09:49:20 -0500 asked a question I'm confused about publishing nav_msgs/Odometry message

I'm confused about publishing nav_msgs/Odometry message I have some questions of the tutorial : Publishing Odometry Info