GB 12898-1991
AbolishedSpecifications for the third and fourth orderleveling
国家三、四等水准测量规范
Application Summary AI generated
GB 12898-1991 specifies technical requirements and procedures for third and fourth order leveling surveys, including instrument accuracy, observation methods, and data processing. It is applied in China for geodetic control networks, engineering construction, and deformation monitoring where moderate precision elevation measurements are needed, such as in railway, highway, and building foundation surveys. The standard ensures consistent vertical accuracy for mapping, infrastructure projects, and scientific research requiring reliable height data.
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