News (11/28/2019): Added 11 Caltrans CVSRN and CCSRN stations with GNSS availability (courtesy of Eric Adney and Bryan Banister). There are now a total of 606 CRTN stations, with 244 GNSS.
News (9/17/2019): Added upgraded NOTA/PBO real-time stations bringing the total number of CRTN stations to 584, with 193 GNSS stations. This fills the gap in the Los Angeles area (see CRTN maps). We plan to include the 91 USGS SCIGN stations when data become available in RTCM3 format.
In February 2018, the CSRC published a new geodetic datum for California called “CSRS Epoch 2017.50 (NAD83)” under a Caltrans contract to SIO/SOPAC. The new epoch-date coordinates have been embedded in the RTCM 3.0 data streams since March 1, 2018.