Josper's profile - activity

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

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?

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

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

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

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

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

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.
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?


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

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

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