The California Spatial Reference Center (CSRC) modernized the California Spatial Reference Network (CSRN) on July 31, 2025. The new California Spatial Reference Network is denoted as CSRN Epoch 2025.00. 

<p>These coordinates changes affect California geospatial users, but the transition process to the new epoch is something that others should understand to prepare for the <a target="_blank" href="https://www.gpsworld.com/changes-in-opus-products-when-the-new-nsrs-is-adopted-what-does-this-mean-to-users/">new, modernized National Spatial Reference System (NSRS),</a> which is expected to be adopted in 2026. As I mentioned in my <a target="_blank" href="https://www.gpsworld.com/changes-in-opus-products-when-the-new-nsrs-is-adopted-what-does-this-mean-to-users/">August 2025 newsletter</a>, NSRS users should proactively assess their geospatial data dependencies and evaluate how adoption of the new datum will affect workflows, datasets and operational decision‑making. </p>    <p>The California Spatial Reference System (CSRS) is the official geodetic datum in California, as published by the California Spatial Reference Center (CSRC) according to <strong>Public Resources Code (PRC) </strong><a target="_blank" href="https://leginfo.legislature.ca.gov/faces/codes_displayText.xhtml?lawCode=PRC&division=8.&title=&part=&chapter=3.&article=" target="_blank" rel="noopener"><strong>§§8850–8861</strong></a>. The image below depicts the CSRN. 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). 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.  CSRN Epoch 2025.00 NAD83(2011) replaces the previous CSRS Epoch 2017.50 NAD83(2011).</p>    <p>The latest hybrid geoid model GEOID18 published by NGS was used to compute Global Navigation Satellite System (GNSS)-derived orthometric heights (DCOH) on the North American Vertical Datum of 1988 (NAVD 88) datum in accordance with the California PRC&nbsp;<a target="_blank" href="https://leginfo.legislature.ca.gov/faces/codes_displayText.xhtml?lawCode=PRC&division=8.&title=&part=&chapter=5.&article=" target="_blank" rel="noopener">§§8890-8902</a> (California Orthometric Heights).</p>   <p>&lt;p&gt;The post <a target="_blank" rel="nofollow" href="https://www.gpsworld.com/california-updates-its-spatial-reference-network/">California updates its spatial reference network</a> first appeared on <a target="_blank" rel="nofollow" href="https://www.gpsworld.com">GPS World</a>.&lt;/p&gt;</p>

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