February 7, 2024 OSU grant proposal includes developing time-dependent models for the new, modernized NSRS By David B. Zilkoski
January 3, 2024 Time is running out to submit GNSS or leveling data for initial NSRS modernization By David B. Zilkoski
December 6, 2023 ASPRS approves edition 2 of the ASPRS Positional Accuracy Standards for Digital Geospatial Data By David B. Zilkoski
December 4, 2023 They used GPS even before it was fully built: The adoption of GPS by surveyors By David B. Zilkoski
