The RIEGL VUX-120²³ is a lightweight and versatile airborne laser scanner offering a wide field of view of 100 degrees and an extremely high pulse repetition rate of up to 2.4 MHz. Thus, it is perfectly suited for high point density corridor mapping applications. The measuring beam of the RIEGL VUX-120²³ is consecutively emitted in three different directions: it alternates from strictly nadir, to +10 degrees forward, and to -10 degrees backward. This allows data acquisition with an unrivaled completeness in data capture, especially in challenging environments with vertical surfaces and narrow canyons.