Install the laser of ROS_ scan_ Problems encountered in match library (I)

laser_scan_matcher library

laser_scan_matcher The package is an incremental laser scanning registration tool . It is ROS Commonly used Laser scanning matcher The code base , It's based on PLICP（ Point to line iteration nearest point ） Incremental laser scanning matching device based on scanning matching algorithm , Use Andrea Censi Standard scan matcher (CSM) Realization . This software package allows scanning of continuous sensors _msgs/LaserScan Matching between messages , And the estimated position of the laser is published as geometry_msgs/Pose2D or tf Transformation .

（ Only lidar data is processed , You can build a map , But the accuracy is not high ）

More information about this library can be found at ROS Wiki Related introduction Get to know .

git clon When I met ：

fatal: unable to access 'https://github.com/ccny-ros-pkg/scan_tools.git/': Could not resolve host: github.com.cnpmjs.org

Check for problems ：

utilize ping Command check github Whether the server works .

ping github.com

1、 If every few seconds time = xx.ms Refresh It turns out to be true ,github.com Not resolved by the host .

terms of settlement ：

（1） edit etc/host

gedit /etc/host

According to the original style Add the target address that needs to be added spa, Here's the picture , Then add :

140.82.114.4 github.com

  Clone again , Download successful .

2、 If it were not so time = xx.ms Refresh , unable ping Through the server , be

（1） edit etc/host

gedit /etc/host

（2） add to github.com domain name

140.82.114.4 github.com

Try it again ping github.com Discovery can ping through
That's all right. , No, change the domain name , You can search the domain name search website

3、 Sure ping through , Or report the above error ：

fatal: unable to access 'https://github.com.cnpmjs.org/ccny-ros-pkg/scan_tools.git/': Could not resolve host: github.com.cnpmjs.org

Delete the marked red field and enter it into the terminal to clone successfully .