Optical measurement technology are used in industrial applications for measurement of physical quantity e.g. height and distance of an object. Taking land surveying as an example, levelling rods are formed thereon with barcodes for automatic detection by a surveying equipment to determine the height of a position at which the levelling rod is set. To enable automatic reading and to ensure measurement accuracy, the physical dimension of each barcode element, e.g. the width of the bars and the spaces therebetween must be correctly detected and measured by the surveying equipment. Measurement accuracy is therefore limited to either the barcode width precision level and/or the optic elements used in the surveying equipment.
It is therefore desirable to provide an optical measurement scaleplate as well as a measurement method and system using such scaleplate which may be used in land surveying and other related measurement applications to provide accurate and reliable measurement result.