When a CORS site first comes on line, NGS uses at least ten 24-h GPS data sets to compute this station’s ITRF2000
positional coordinates relative to other stations in the global IGS network. Also,
NGS uses the horizontal time-dependent positioning HTDP software Snay 1999 to predict the station’s ITRF2000 velocity.
NGS then transforms the ITRF2000 positional coordinates and velocity for this CORS site into their corresponding
NAD 83 CORS96 values via the adopted 14-parameter similarity transformation Soler and Snay 2004.