What is OPUS an abbreviation for in the context of surveying?

OPUS stands for Online Positioning User Service. This term is used in the field of surveying to describe a service provided by the National Oceanic and Atmospheric Administration (NOAA) that allows users to obtain precise positioning information from global satellite systems. OPUS provides a web-based interface where surveyors can upload their GPS data to receive accurate, georeferenced positions based on the National Spatial Reference System (NSRS). This is particularly beneficial for achieving high accuracy in surveying tasks without the need for extensive local infrastructure.

The significance of OPUS lies in its ability to enhance the efficiency and precision of surveying projects, as it enables users to access high-quality positioning data remotely. This service plays a crucial role in modern surveying, particularly for applications like geodesy, mapping, and civil engineering projects.