// This file is used for collecting data fromm <em>imu</em> and camera at the same time.
// One camera and one <em>imu</em>
Accelerometers measure specific force (proper acceleration), which is the acceleration relative to free-fall, not the "standard" acceleration that is relative to a coordinate system.
building from source前提是安装了ROS indigo和catkin工作空间。
安装ROS indigo （see
<em>ros</em>.org for more information）
在Ubuntu 14.04安装ROS indigo:
sudo sh -c 'echo "deb
The magnetoresistive sensors within the nIMU and µIMU units have been calibrated under a controlled
magnetic environment to determine temperature corrections to their bias and sensitivity. Additional
corrections will be necessary to the magnetometer output if these devices will be operated in an
environment containing additional local magnetic fields.