解决hector_quadrotor_gazebo launch文件无法正常加载的问题下视摄像头无法打开的问题

kinetic+乌班图16.04+gazebo7.0

安装参考连接：https://blog.youkuaiyun.com/JiesFeng/article/details/80259761

github：https://github.com/tu-darmstadt-ros-pkg/hector_quadrotor

问题：

解决方法：rosservice call /enable_motors true
https://blog.youkuaiyun.com/buchunjiedexin/article/details/79662160

问题1：
roslaunch hector_quadrotor_gazebospawn_quadrotor_with_downward_cam.launch
无法正常加载：
solution：

roscd hector_quadrotor_description
gedit quadrotor_downward_cam.gazebo.xacro

<?xml version="1.0"?>

<robot name="quadrotor" xmlns:xacro="http://www.ros.org/wiki/xacro">
    <xacro:include filename="$(find hector_quadrotor_description)/urdf/quadrotor_downward_cam.urdf.xacro" />
    <xacro:include filename="$(find hector_quadrotor_gazebo)/urdf/quadrotor_plugins.gazebo.xacro" />
</robot>

问题2：
添加turtlebot_gazebo 雷达 hokuyo
参考文章：添加雷达模型
需要注意的是：
/opt/ros/kinetic/share/turtlebot_description/urdf
需要更改文件turtlebot_gazebo.urdf.xacro 。添加雷达传感器