The NAD 83 (CORS96) positional coordinates are published for an epoch date of 2002.0,
except in Alaska and California where epoch dates of 2003.0 and 2004.0, respectively, have been adopted
because of recent earthquakes.
One must apply the adopted velocities to compute positional coordinates for any other epoch date.
At this writing, the coordinates and velocities of the CORS sites form the foundation of the NSRS and the recently completed NAD 83 (NSRS2007) readjustment (Vorhauer 2007).