CSRN Epoch 2025.00
News 10/8/2025: GPS World article by David Zilkoski: "California Updates its Spatial Reference Network"
Epoch 2025.00 coordinates spreadsheet V3 (Table 1 of Project Report): (xlsx) - added Q198,Q247(DWR), OWHQ(CTSRN)
Epoch 2025.00 coordinates spreadsheet V2: (xlsx) - changed longitudes to West
Epoch 2025.00 coordinates spreadsheet V1: (xlsx)
Project Report V2 (pdf) August 18, 2025
Project Report V1 (pdf) July 31, 2025
CSRN stations - Choose "Load Saved Sites" to input this json file to MGViz (lower left) to view interactive map of Epoch 2025.00 stations.
The CSRC, under contract from the California Department of Transportation (Caltrans) Contract No. 52A0157, Task Order 1 has published, on July 31, 2025, a new reference frame for California called “CSRN Epoch 2025.00 NAD83(2011)” or "CSRN Epoch 2025.00" for short. The California Spatial Reference System (CSRS) is realized by the geodetic coordinates and uncertainties of the CSRN on the date of 2025.00 (January 1, 2025; GPS week 2347, day 3) of 1068 GNSS stations (881 active and 187 defunct stations) in California and at the borders of Arizona, Nevada, Oregon and Baja California.
The CSRS is the official geodetic datum in California, as published by the California Spatial Reference Center (CSRC) according to Public Resources Code (PRC) §§8850–8861. It is rigorously aligned to the current definition of the National Spatial Reference System (NSRS) through a set of coordinate transformations from ITRF2020 to NAD83(2011) as published by the NOAA/NOS National Geodetic Survey (NGS).
CSRN Epoch 2025.00 NAD83(2011) replaces the previous “CSRS Epoch 2017.5.0 NAD83(2011)” datum that included coordinates for 950 CSRN stations.
The latest hybrid geoid model GEOID18 published by NGS is used to interpolate geoid heights for each of the CSRN stations as the basis of Global Navigation Satellite System (GNSS) derived California Orthometric Heights (DCOH) on the NAVD 88 datum in accordance with the California PRC §§8890-8902 (California Orthometric Heights).
On July 31, 2025, the CSRC published a new geodetic datum for California called “CSRN Epoch 2025.00 NAD83 (2011)” under a Caltrans contract to SIO/SOPAC. The new NAD83(2011) epoch-date coordinates are transmitted by CRTN with RTCM 3.3 data streams starting August 11, 2025.