Currently, the camera_link frame is located at the front-center of the D435 as shown below....  However, according to [this](https://github.com/IntelRealSense/realsense-ros#about-frame-id), the camera_link frame should be located in the depth frame as shown below...  .. so that the transforms created by the RealSense node to the RGB and other IR sensor line up correctly as shown below... 
Currently, the camera_link frame is located at the front-center of the D435 as shown below....
However, according to this, the camera_link frame should be located in the depth frame as shown below...
.. so that the transforms created by the RealSense node to the RGB and other IR sensor line up correctly as shown below...