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This document describes the determination of height-resolved profiles of atmospheric backscattering by means of active optical sounding. The measurements allow the following properties of the atmosphere up to several kilometres above ground to be derived: The document goes on to discuss the depolarisation lidar and the use of multi-wavelength systems. This allows further parameters to be determined: The following fields of application are particularly important: Examples that illustrate these applications are discussed in the Annex A. The benefits of scanning systems for parameters mentioned above are also discussed in Annex A.7. In addition, particle backscatter lidars that measure at least two carefully selected wavelengths can be used to determine atmospheric gas concentrations. This is known as the differential absorption technique “DIAL”. This technique is not part of this document and has been described in VDI 4210-1. This document does not describe extended lidar techniques which monitor the following parameters quantitatively: inelastic scattering effects such as, Raman scattering, Doppler broadening, Doppler shift, multiple scattering, modulation techniques, and spectral separation of molecular and particle backscattering (HSRL = high spectral resolution lidar). Some of these extended techniques have been or will be described in other parts of the ISO 28902 series. This document does not address special features of airborne or satellite-borne systems.