What is ISO 17123-9 - testing geodetic and surveying instruments about?
ISO 17123-9 is a safety standard on the field procedures for testing geodetic and surveying instruments.
ISO 17123-9 specifies field procedures for determining and evaluating the precision (repeatability) of terrestrial laser scanners and their ancillary equipment when used in building, civil engineering, and surveying measurements. Primarily, these tests are intended to be field verifications of the suitability of a particular instrument for the immediate task at hand and to satisfy the requirements of other standards.
ISO 17123-9 can be thought of as one of the first steps in the process of evaluating the uncertainty of measurements (more specifically of measurands). BS ISO 17123-9:2018 history
2018BS ISO 17123-9:2018 Optics and optical instruments. Field procedures for testing geodetic and surveying instruments - Terrestrial laser scanners