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OPUS: the Online Positioning User Service, process your GNSS data in the National Spatial Reference System
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Evaluation of the Online Positioning User Service for Processing Static GPS Surveys: OPUS-Projects, OPUS-S, OPUS-Net, and OPUS-RS | Journal of Surveying Engineering | Vol 145, No 3
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NGS replacing NGS 58 and 59 documents: Specifications for GNSS geodetic control surveys using OPUS projects - GPS World
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OPUS: the Online Positioning User Service, process your GNSS data in the National Spatial Reference System
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