GB/T 26596-2011 is a standard for the terminology of geodetic measuring instruments in Optical inspection and opticalin strument. It systematically sorts out and clarifies various professional terms in the field of geodetic measuring instruments, covering the structure, function, Measurement principle and other related words of level, theodolite, total station and other instruments. By unifying the definition of terms, eliminate the ambiguity of communication and exchange within the industry, provide a standardized language foundation for the research and development, production, use and technical exchange of geodetic measuring instruments, help the industry to carry out work efficiently and accurately, and promote the development and application of geodetic measurement technology.