PPT Slide
? NGS provides accurate coordinates and velocities for 216 CORS stations
? ITRF97, epoch 1997.0 [soon: ITRF2000]
? NAD 83 (CORS96), epoch 1997.0
? These positions and velocity field form the reference framework of the National Spatial Reference System (NSRS) and are available on-line from NGS Data Base
Coordinates and Velocities (03-26-01)