alternatives

OPUS is an online GNSS static data post-processing service. NOAA’s Online Positioning User Service (OPUS) provides free access to high-accuracy National Spatial Reference System (NSRS) coordinates. This service is occasionally unavailable so the following links can be used to post-process your static GNSS observation. CSRS-PPP Canadian Spatial Reference System (CSRS) Precise Point Positioning (PPP) is a service…