• Ros Launch File

    img image file Select the drive letter of the SD card in the device box. Tutorial: Using a URDF in Gazebo. To access your ROS utility, go to www. ROS file? Execute. Nodelet Everything¶ Nodelets are vital for squeezing more performance out of ROS, particularly for vision, control, or other high-frequency and/or bandwidth applications. The Gazebo robot simulation. The BattleScribe Roster Editor file type, file format description, and Windows, Android, and iOS programs listed on this page have been individually researched and verified by the FileInfo team. These instructions were tested on an NVidia TX2 flashed with APSync and then ROS and MAVROS were installed as described here. Someone else has already done that, and they've probably done it better than you, so you can focus your energy on specific part you want to build. Attach the debugger to a running node. cpp file in ROS. May 19, 2018 · Welcome to this "ROS In 5 Minutes" videos series. Open a terminal and execute the following command: roslaunch zed_wrapper zed. The ROS distro will automatically be confirmed from the parent environment, or you will be prompted to select a ROS distro if this can't be done automatically. CMakeLists. ROSCon 2018 is a chance for ROS developers of all levels, beginner to expert, to spend an extraordinary two days learning from and networking with the ROS community. Projects hosted on Google Code remain available in the Google Code Archive. ROS has you covered, providing seamless integration with these and other popular open source projects, along with a message passing system that allows you to easily swap out different data sources, from live sensors to log files. yaml files to be used as parameters (in addition to, and at the same time as, individually specified parameters for a node), then launch could just combine all of the yaml files and parameter kay-value pairs into a single. Launch Files¶. Many ROS packages come with "launch files", which you can run with: $ roslaunch package_name file. There are parameters needed to be set in a. If someone sends you a link to a file hosted online, you can often open it with the right kind of app. The events can then be acted on through the launch framework. Tutorial: Using a URDF in Gazebo. The DOE teams compared the copies of depot-issued delivery receipts and sales invoices with the official receipts being issued by the ROs to determine the specific excise implementation dates and verify that the outlets are imposing the correct excise tax rates. appxbundle package) to help optimize the packaging and distribution of a Windows Store app and resource packages to users. A rosbag or bag is a file format in ROS for storing message data. 0 is a successor of ROSbot - an autonomous, open source robot platform - now with a RGBD camera and improved design. launch extension). In other words, environment variables and ROS package paths will be set to their values in your current environment, even for remotely launched processes. ROS Log Files (rosbags) Introduction. Choose which maps to run, and enjoy the existing optimized map navigation. // Want to learn ROS fast? Go to the Robot Ignite Academy and learn ROS fast. RosLaunch first checks for a roscore also known as the ros master and checks to see if it is running. NetEase Games claims that it has more than 150 million registered players worldwide. Is STDR in ROS ecosystem? Official ROS wiki page How can I download it? Ways to get STDR Simulator What does it look like? Gallery. Since we do not have any programs listed that we have verified can open MMRC files, we suggest that you try a universal file viewer like Free File Viewer. To learn more about launch files and more generally ROS, enroll to my Udemy course. Someone else has already done that, and they've probably done it better than you, so you can focus your energy on specific part you want to build. If you don’t have one at the time, you can save almost any. While we do not yet have a description of the ROS file format and what it is normally used for, we do know which programs are known to open these files. Select your Certificate and enter your Password; Click Login; Under My Services, select the option Upload Forms Completed Offline; Select P30 from the drop down menu and click Upload Return. I am trying to launch a file from remote computer but I could not success. launch file:. launch The wrapper is now running and the ZED camera outputs are now accessible on the published ROS topics. "Open ISO image file" is generally used for getting more information about an existing ISO file. When launching an empty world with the following. Inside, create a file called camera. Credits Authors Carol Fairchild Dr. The best way to use Gazebo launch files is to simply inherit/include the master empty_world launch file located in the gazebo_ros package. If you don’t have one at the time, you can save almost any. According to ROS's file structure, the launch file should be created under the launch directory. From drivers to state-of-the-art algorithms, and with powerful developer tools, ROS has what you need for your next robotics project. Nov 13, 2019 · Tools for launching multiple processes and for writing tests involving multiple processes. Jun 15, 2016 · Exporting ROS Bag Files to Matlab, v2. img image file Select the drive letter of the SD card in the device box. While we do not yet have a description of the ROS file format and what it is normally used for, we do know which programs are known to open these files. It provides easy to use functionality for most operations that a user may want to carry out, specifically setting joint or pose goals, creating motion plans, moving the robot, adding objects into the environment and attaching/detaching objects from the robot. This directory should be in your ROS package path. What I do is: I subscribe to recorded topics (bag files) using image_transport package, I republish their content to different topics (from compressed to raw), and eventually I subscribe. Hello ROS Developers! In today's video we are going to see how to include a ROS launch file inside of another one, which is really useful specially if you are working with big projects. ROS, a weak signal sound card mode for Amateur Radio Rod outer segment , the light sensitive part of a in the retina of the eye Robot Operating System , an open source robotics platform by Willow Garage and Stanford AI Labs. Format C++ using the ROS clang-format style. Lifecycle nodes launched through launch_ros automatically emit events when they transition between states. Structure, launch-files, and best practices - ROS C++ client library (roscpp): Creating your own ROS C++ programs - Simulating with ROS. Harman Reviewer Shweta Gupte Commissioning Editor Dipika Gaonkar Acquisition Editors Vivek Anantharaman Prachi Bisht Content Developm. Launch files allow you to start up and configure a number of executables containing ROS 2 nodes simultaneously. If it's someplace else, I would suggest leveraging environment variables with something like. Corel Word Perfect is part of Corel Word Perfect Office suite. When running the node from a local launch file (manually ssh into the remote machine and run launch file), everything runs fine. It is a collection of tools, libraries, and conventions that aim to simplify the task of creating complex and robust robot behavior across a wide variety of robotic platforms. The file must be locally accessible, though it is strongly recommended that you use the package-relative $(find)/file. Getting Started With ROS ( Robotic Operating System ). The con files are used by Corel WordPerfect for concordance files. To open a PalmDOC PDB file, try STDU Viewer. ros extension errors, file errors Identify, Fix and open files which Microsoft Windows can't open How to open ros file extension ?. within ros there is a realsense-ros package that provides a wrapper for working with the cameras in ros and lets you view images and other data in. ROS (Robot Operating System) is rapidly becoming a de facto standard for writing interoperable and reusable robot software. rostopic pub and echo in launch file. ns="namespace" (optional) Scope the parameters to the specified namespace. 一 launch file 介绍. ns attribute is not supported. 04 and ROS Kinetic. ROSCon 2018 is a chance for ROS developers of all levels, beginner to expert, to spend an extraordinary two days learning from and networking with the ROS community. May 21, 2018 · Step3: create a launch file. Watch Ros-bot kill monsters for you using configurable build-optimized attack routines. Actually I can connect to remote computer but I think the problem is with including a file from remote computer. Create new package mkdir ~/catkin_ws cd ~/catkin_ws catkin_create_pkg MYROBOT_control controller_manager joint_state_controller robot_state_publisher cd MYROBOT_control mkdir config mkdir launch. But before we start, if you are new to ROS and want to Learn ROS Fast, I recommend you to take. However it assumes that you understand the basic organization of ROS, what nodes are, and how they interact. ROS Parameter Server¶ Configuration information in ROS is usually saved to the Parameter server. [ROS Q&A] 114 - Set robot initial pose in ROS launch file by Alberto Ezquerro / Monday, 23 April 2018 / Published in ROS Q&A On this ROS tutorial video we show you how you can easily modify, in the ROS launch file, the initial position where the robot will spawn at in the Gazebo simulation world. launch launch/cyton_rviz. Have you initialized and built your workspace? cd ~/GHRosBotTutorials/src catkin_init_workspace cd ~/GHRosBotTutorials catkin_make After this operation you should have two new folders in your workspace: build and devel, thesecond one should contain setup. Currently it uses the default usb bus to launch the kinect, but you could either make it so one launch file launches both kinects by checking two usb buses, or making two launch files that launch from the separate ports. You can insert additional models into your robot's world file and use the File->Save As command to export your edited world back into your ROS package. A rosbag, or bag, is a file format for storing ROS message data. in the main. If you want to Learn ROS Fast, we recommend you the following courses: ROS In 5 Days (Python) ROS In 5 Days (C++) Whether you like the. what are the differences between "name" and "type" in roslaunch? Is there a way to set the respawn-property at runtime? Extracting output data from launch file node. ROSCon 2018 is a chance for ROS developers of all levels, beginner to expert, to spend an extraordinary two days learning from and networking with the ROS community. 2 with ROS Kinetic, you can likely use any ROS-compatible Linux distro that runs on the Raspberry Pi or Intel Joule. The ros file contains rail object style data. Open it with your favorite editor, mine is gedit. amr-ros-config. Open ~/bashrc file. Click on the Generate Package button. The events can then be acted on through the launch framework. ros files to another format?. ROS uses launch XML files to describe how and what needs to be started. "catkin_make" and "source devel/setup. About REZ Files. cpp which is a ROS-ified version of the rc_balance program. Double click the ros file to open it. ROS has you covered, providing seamless integration with these and other popular open source projects, along with a message passing system that allows you to easily swap out different data sources, from live sensors to log files. sh file extension are self-extracting archive files. Understanding ChefBot ROS launch files We will now look at the functions of each of the launch files of the ChefBot_bringup package: robot_standalone. ros files coming from an unknown source! Can't open a. Create new package mkdir ~/catkin_ws cd ~/catkin_ws catkin_create_pkg MYROBOT_control controller_manager joint_state_controller robot_state_publisher cd MYROBOT_control mkdir config mkdir launch. In ROS PC Game, 120 Players will air dropped in a vast, deserted island. I'm trying to pass values from the launch file to the xacro model, so I can, for example, launch two robots in a single world but using different topic names or material colors. ter and many nodes all at once, using a file called a launch file. Join GitHub today. It provides easy to use functionality for most operations that a user may want to carry out, specifically setting joint or pose goals, creating motion plans, moving the robot, adding objects into the environment and attaching/detaching objects from the robot. ROSCon 2019 is a chance for ROS developers of all levels, beginner to expert, to spend an extraordinary two days learning from and networking with the ROS community. some parameters from the ROS launch file in my Qt GUI. In the package, create a folder by the name launch and create a filename. About ROS The Robot Operating System (ROS) is a flexible framework for writing robot software. These bags are often created by subscribing to one or more ROS topics, and storing the received message data in an efficient file structure. Files that contain the. On this ROS tutorial video we show you how you can easily include multiple launch files into a single launch file. This is a basic example of starting 3 nodes in a single processor. Watch Ros-bot kill monsters for you using configurable build-optimized attack routines. NetEase Games claims that it has more than 150 million registered players worldwide. Available in ROS 1. service As the name suggests, this runs the ROS Master (roscore) magni-base. On May 30, 2018, the game was also released on Steam. "With taxpayers and agents working towards a deadline of midnight tonight, 12. openag_brain contains default launch files designed for the Food Computer 2. I'm writing a launch file for my kinect+irobot. launch] is neither a launch file in package nor is a launch file name 05-23 阅读数 821 ubuntu14. Then the Launch file runs all of the nodes within the launch file. There are two ways to launch your URDF-based robot into Gazebo using roslaunch: ROS Service Call Spawn Method. Requesting RPNs by file upload This option is suitable if you have created an RPN request file from your ROS compatible payroll package. Understanding ChefBot ROS launch files We will now look at the functions of each of the launch files of the ChefBot_bringup package: robot_standalone. MoveGroup - ROS Wrappers in C++ and Python¶. I am using ROS Groovy and I updated Gazebo to 1. ROS is an open source project which includes a ton of useful tools and that makes developing process more efficient. Select your Certificate and enter your Password; Click Login; Under My Services, select the option Upload Forms Completed Offline; Select P30 from the drop down menu and click Upload Return. ROS file extension is popular essentially, for its role is important in various Windows Operating Systems. Mar 14, 2016 · Im using ROS Fuerte and qt_ros so can integrate ROS in Qt GUI. : This tutorial is going to walk you through installing Ubuntu 10. bak file will be created. BAC File Opener. ros file extension. 'roslaunch' is a tool in ROS that allows you to start multiple nodes (which are defined in a launch file) with only one command. From drivers to state-of-the-art algorithms, and with powerful developer tools, ROS has what you need for your next robotics project. As a result, crafting a two-node system where one of the. The DOE teams compared the copies of depot-issued delivery receipts and sales invoices with the official receipts being issued by the ROs to determine the specific excise implementation dates and verify that the outlets are imposing the correct excise tax rates. In other words, I am looking for a machine tag for include. Note how the launch file first brings up a sound_play node before launching the talkback. We also are botters, and we use it, intensively. NetEase Games claims that it has more than 150 million registered players worldwide. launch Is there a way, in my. I'm trying to pass values from the launch file to the xacro model, so I can, for example, launch two robots in a single world but using different topic names or material colors. If this message persists, please visit the ROS Helpcentre for assistance. Even harmful programs can create. ROSCon 2017 is a chance for ROS developers of all levels, beginner to expert, to spend an extraordinary two days learning from and networking with the ROS community. Understanding ChefBot ROS launch files We will now look at the functions of each of the launch files of the ChefBot_bringup package: robot_standalone. ros file be opened, edited or printed? How can I convert. What is ROS (Rules of Survival)? Rule of Survival is a free-to-play online multiplayer battle royale game which is developed and published by NetEase Games. It should allow you to. The third node is the tutorial program. Revenue Online Service (ROS) enables you to view your own, or your client's, current position with Revenue for various taxes and levies, file tax returns and forms, and make payments for these taxes online in a variety of ways. these request and response messages are defined in srv files. You're trying to open a. May 31, 2019 · Thank you very much to all contributors and to the team at Open Robotics! Micro-ROS uses the ROS 2 stack to bridge the gap between powerful microprocessors and embedded microcontrollers (MCU). Tutorial: Using a URDF in Gazebo. roslaunch is used to open launch files. subst_value=true|false (optional) Allows use of substitution args in the YAML text. Either append it to the ROS_PACKAGE_PATH environment variable1, or place it in the src subdirectory of your catkin workspace2. launch 파일로 만들어야하고, 실행할때는 roslaunch 이름. Someone else has already done that, and they've probably done it better than you, so you can focus your energy on specific part you want to build. launch file from the command line. Charles has 1 job listed on their profile. May 19, 2018 · Welcome to this "ROS In 5 Minutes" videos series. This contains the example files for the MATLAB and Simulink Robotics Arena video "Deep Learning with NVIDIA Jetson and ROS". Open ros file for free, Instant scan for. launch file, to just call openni_node. NetEase Games claims that it has more than 150 million registered players worldwide. Hello guys, I have the following issue on gazebo 1. cpp file of the GUI Im using the ROS launch file to start the prcess like this:. The con files are used by Corel WordPerfect for concordance files. These files are supposedly compatible with both 3ds max and Autodesk VIZ. The Visual Studio Solution file type, file format description, and Mac, Windows, and Linux programs listed on this page have been individually researched and verified by the FileInfo team. The invited talks from Brian Gerkey (Open Robotics) and Nicholas Yeo (ROS-Industrial Asia Pacific), 14 submitted talks, 13 lightning talks, 26 exhibitors' booths, and everything else about the conference was of high quality. From drivers to state-of-the-art algorithms, and with powerful developer tools, ROS has what you need for your next robotics project. ros file? How can the. Usually, users can easily open. launch로 실행해야함. However it assumes that you understand the basic organization of ROS, what nodes are, and how they interact. It answers questions such as: What is the. All instructions and program features are available in notes. Actuate provides flexible and high-performance reporting capabilities for any application in the enterprise. A rosbag, or bag, is a file format for storing ROS message data. What is a ROS file? Every day thousands of users submit information to us about which programs they use to open specific types of files. The idea is that you don't have to redesign the wheel every time. subst_value=true|false (optional) Allows use of substitution args in the YAML text. In ROS 2, it’s not. Within the Open dialog, set the filter to All Files and then open the DAT file. These tutorials will step you through using MoveIt! with your robot. Rviz is the primary visualizer in ROS and an incredibly useful tool for debugging robotics. Hello ROS Developers! In today's video we are going to see how to include a ROS launch file inside of another one, which is really useful specially if you are working with big projects. 在运行ros程序时我们往往需要在不同终端启动多个不同的节点,这会让人有些沮丧。幸运的是,ROS 提供了一个同时启动节点管理器(master)和多个节点的途径,即使用启动文件(launch file)。. The linux image we provided for you already has the Robotics Cape drivers and ROS installed. ROSCon 2018 is a chance for ROS developers of all levels, beginner to expert, to spend an extraordinary two days learning from and networking with the ROS community. cpp which is a ROS-ified version of the rc_balance program. CRASH File Summary. Credits Authors Carol Fairchild Dr. Nov 12, 2019 · Revenue is to extend the pay and file deadline until 6pm tomorrow following problems with its online system ROS. 0 This entry was posted in Educational Material * on June 15, 2016 by David. ROSCon will happen September 29th-30th, 2018 Join us at the NH Collection Eurobuilding in Madrid, Spain. BAC File Opener. ROS file by double-clicking on it. Let me describe one of these problems and the solution,. messages can include arbitrarily nested structures and arrays (much like c structs). createtrackbar(). However it assumes that you understand the basic organization of ROS, what nodes are, and how they interact. URDF, launch files, and other ROS configuration for AMR robots. Watch Ros-bot kill monsters for you using configurable build-optimized attack routines. What I do is: I subscribe to recorded topics (bag files) using image_transport package, I republish their content to different topics (from compressed to raw), and eventually I subscribe. It is free for commercial use. Jun 16, 2017 · The “world’s most popular open source robot for education and research” has received a major upgrade with two modular TurtleBot3 models from Open Robotics that run Linux and Robot Operating System (ROS): – Burger version, based on a Raspberry pi 3 which runs on a Broadcom BCM2837. The simplest way to use MoveIt through scripting is using the move_group_interface. Open ros file for free, Instant scan for. Available in ROS 1. launch file:. The code for ROS 2 is open source and broken into various repositories. May 20, 2018 · Hi all! Welcome to this “ROS In 5 Minutes” videos series. The focus is on how to structure launch files so they may be reused as much as possible in different situations. The Universal Robotic Description Format (URDF) is an XML file format used in ROS to describe all elements of a robot. Since it is only a partial file it may be problematic to get all the information from the file but depending on the type of the file you may still be able to extract some useful information from it. The BattleScribe Roster Editor file type, file format description, and Windows, Android, and iOS programs listed on this page have been individually researched and verified by the FileInfo team. modify the novatel_gps_driver::novatelgps class: add an instance of your parser, a buffer for storing parsed messages, and a method for retrieving. You can use these bags for offline analysis, visualization, and storage. Mar 14, 2016 · Im using ROS Fuerte and qt_ros so can integrate ROS in Qt GUI. launch의 장점이라 하면 여러개의 노드를 원하는 방식(?)으로 그룹을 묶거나 여러개를 실행하고 roscore도 같이 실행되는. awesome-ros2 is a "cheat sheet" style quick reference for ROS 2 packages and resources to help GitHub users get to know ROS 2. This launch file also spawns a rviz window configured to visualize Cartographer's state. Get the SourceForge newsletter. Getting data out of so-called bagfiles for analysis in MATLAB, Excel, or isn't the easiest thing in the world. Click "Save" to save a certificate backup file in your Downloads folder. For example. I've been trying to run robot_state_publisher and joint_state_publisher on a remote TX1 running Ubuntu 16. PRC file extension for that program to recognize it. Having said that, we know there’s a large deployed codebase out there that depends on ROS 1. robot_standalone. ROS Toolbox provides an interface connecting MATLAB ® and Simulink ® with the Robot Operating System (ROS and ROS 2), enabling you to create a network of ROS nodes. Programming for Robotics - Introduction to ROS. If you find this file inside a folder, probably this folder is a package or a metapackage. It should allow you to. OpenCV is open source and released under the BSD 3-Clause License. Five known software programs (notably, Dragon UnPACKer developed by Open Source) are related to the BIG file extension. It has around 80 million players from all around the World. many people want ros wallhack, guns hack, full body power hack etc. However it assumes that you understand the basic organization of ROS, what nodes are, and how they interact. Having said that, we know there’s a large deployed codebase out there that depends on ROS 1. Copy the code below into it. In ROS 2, it's not. some parameters from the ROS launch file in my Qt GUI. I also show why they are needed and important. Then the Launch file runs all of the nodes within the launch file. Thank you so much for your time and sorry I did not clear this. For example, if you are trying to open an audio file, but failing to open it, you might need to update your sound card drivers. If you want to Learn ROS Fast, we recommend you the following. In this lecture, I explain the concept of launch files in ROS, and illustrate how to create a launch file and how to execute it with roslaunch to start multiple nodes at the same time. Known for their ethereal sound, frontman Jónsi's falsetto vocals, and the use of bowed guitar, the band's music incorporates classical and minimal aesthetic elements. To learn more about launch files and more generally ROS, enroll to my Udemy course. A rosbag, or bag, is a file format for storing ROS message data. URDF, launch files, and other ROS configuration for AMR robots. Jan 10, 2012 · This tutorial gives a brief introduction on how to write a launch file in ROS. many players have a problem that how to win rules of survival in ios devices like iphone github - ros/cheatsheet: the ros cheatsheet. 04 and ROS Kinetic. Solution From the list below, select the appropriate program, install it and double click on the icon of a file that did not want to open - the problem with the. The ros file contains rail object style data. Hi, Another question that might be related to this one. Available in ROS 1. This post documents how to create a ROS Laubch file. Gps messages ros. It answers questions such as: What is the. yaml_cpp - ROS Wiki. There are parameters needed to be set in a. arg tags nested in an include tag don’t support conditionals. Package Summary. We recommend following the tutorials in order, from the “Users” set to the “Developers” set to gain basic foundational knowledge of ROS 2. abstract— this paper gives an overview of ros, an open- source robot operating,system. If it's someplace else, I would suggest leveraging environment variables with something like. Open ros file for free, Instant scan for. It has around 80 million players from all around the World. Anyhow! My problem is at the point where I open the "controlTypeExamples. download gps messages ros free and unlimited. See the ROS Wiki page for more information about rosbags. Tutorial: Using a URDF in Gazebo. Structure of. urdf and other ROS files. But before we start, if you are new to ROS and want to Learn ROS Fast, I recommend you to take. in the main. download ros launch file node arguments free and unlimited. However it assumes that you understand the basic organization of ROS, what nodes are, and how they interact. amr-ros-config. It can open over 200 different types of files - and very likely yours too! Download Free File Viewer. service As the name suggests, this runs the ROS Master (roscore) magni-base. yaml files to be used as parameters (in addition to, and at the same time as, individually specified parameters for a node), then launch could just combine all of the yaml files and parameter kay-value pairs into a single. ROS Launch File. In today's videos we are going to see what's a launch file and how to launch it. The Jackal_navigation package simply contains configuration files in the params directory, and launch files to load these parameters and launch certain packages in the ROS navigation stack. Python is one of the supported language in ROS, you can use it inside a ROS program with rospy. The SH file archive contains selected files and a shell script along with instructions on how to extract the contents of the SH file archive. Otherwise, look for clues in the binary data about the file's encoding or compression type, or the tool that created it. Next up is setting up the Hector_SLAM package to work with Neato. a process is started for roscore. launch files. It occurs to me that it would be nice to be able to use the same control/mapping/planning software on the real machine or Gazebo, with only a difference in launch files. Revenue Online Service. Prerequisites ¶ In order to complete this tutorial we need a package in which to place our launch file in. Since we do not have any programs listed that we have verified can open MMRC files, we suggest that you try a universal file viewer like Free File Viewer. Be it from areas like mobility, perception, smart factory or from development tools through planing, modelling or simulation. urdf and other ROS files. cpp file in ROS. 04 and ROS Kinetic. • Generally all those files in the package are organized with the following structure: launch folder: Contains launch files src folder: Source files (cpp, python). Pay and file. RosLaunch first checks for a roscore also known as the ros master and checks to see if it is running. evolutionary inverse kinematics for ros and moveit. launch file. The focus is on how to structure launch files so they may be reused as much as possible in different situations. ROS (Robot Operating System) is rapidly becoming a de facto standard for writing interoperable and reusable robot software. ttt" scene, and at this moment I am only interested in the RED ROBOT!. Nov 06, 2014 · Using rosbag_pandas to Analyze rosbag Files with Python 1 This entry was posted in Equipment * Misc * Procedures * Projects * Uncategorized and tagged pandas python ROS rosbag on November 6, 2014 by Adam Taylor. But before we start, if you are new to ROS and want to Learn ROS Fast, I recommend you to take. when I open it as XYZ file nothing is shown in meshlab. MoveGroup - ROS Wrappers in C++ and Python¶. The ROS distro will automatically be confirmed from the parent environment, or you will be prompted to select a ROS distro if this can't be done automatically. Launch file is useful when you want to start/launch many nodes at once without any need to do "rosrun for every node".