Update README.md

update total readme

README.md

@@ -7,21 +7,26 @@
  * @LastEditTime : 2020-01-13 14:10:25
  -->
 # SmartCar-Tools
-Tools for self-driving car
+Light-weight tools for self-driving car
 
-## 写在前面
-1. 每个单独的模块都有自己的使用说明,参考模块自身的`README.md`
-2. 关于环境配置问题,我正在制作Docker镜像
+## Description
+For the needed of our project, I designed two small tools currently:
+1. [grid_map_generator](https://github.com/LitoNeo/SmartCar-pcd-map-Tools/tree/master/map_tools/modules/grid_map_generator): Used to downsample the pcd maps and divide one big pcd map to small one, which are the input of `pcd_map_manager`.
+2. [trajectory_generator](https://github.com/LitoNeo/SmartCar-pcd-map-Tools/tree/master/map_tools/modules/trajectory_generator): Used to extract defined driving paths (trajectoies), which is a light-weight description of roads.
+
+**For the useage of each tool, refer to their own `README` document**
 
 ## How to Build
 This repo depends on QT-5.9 and ROS1.0, be sure it is correctly installed on your pc.
-I tested it on `Ubuntu1604`.
+I tested it on `Ubuntu1604` and 'Ubuntu1804'
 
 1. `mkdir -p catkin_ws/src && cd catkin_ws/src`
 2. `git clone https://github.com/LitoNeo/SmartCar-Tools.git`
 3. `cd .. && catkin_make`
 
-## map_tools
+> Note: Just as general ROS modules, you need to `source devel/setup.bash` before running the tools
+
+## map_tool modules
 > Tools used to process map data.(especially for pcd files)
 1. **trajectory_generator**
 A qt-based tools used to define and extract drivable trajectory.
@@ -31,6 +36,3 @@ Currently it only extracts drivable trajectories, that is, a minimum subset of h
 A qt-based tools to downsample and mesh the big pcd maps to small one.   
 For more details, refer [here](https://zhuanlan.zhihu.com/p/77745476)
 
-
-## driver
-> useful driver for self-driving car