  Simultaneous Localization and Mapping, commonly known as SLAM, has been an
active research area in the field of Robotics over the past three decades. For
solving the SLAM problem, every robot is equipped with either a single sensor
or a combination of similar/different sensors. This paper attempts to review,
discuss, evaluate and compare these sensors. Keeping an eye on future, this
paper also assesses the characteristics of these sensors against factors
critical to the long-term autonomy challenge.
