An excellent comparison of various available LiDAR sensors can be found at (Lemmens, 2007) . Sensors vary in their specifications and accordingly are suitable for collecting data with varied characteristics, as required in different applications. Moreover, each sensor possesses a large range of parameters in order to arrive at the required data specification. Some of the most commonly used sensors are ALTM by Optech Canada, ALS by Leica Geosystems, Toposys by Toposys GmBH, TopEye by Hansa Luftbild and RIEGL.