WSRN Geodetic Reference Framework

The geodetic policy of the WSRN is to constrain all WSRN stations to the National Spatial Reference Framework (NSRS) of the National Geodetic Survey (NGS). Some of the WSRN stations are NGS CORS, others have been bluebooked at the NGS, and the rest are constrained to NGS CORS through a rigorous network adjustment.

All ellipsoid heights shown on this website are in meters unless otherwuise stated

Pending Datum Transistion
The National Spatial Refernce System (NSRS) will change from NAD83-2011 to NATREF-2022 in early 2026. The WSRN will transition to the new NSRS (Datum) on the same date as the National Geodetic Survey (NOAA NGS). However, for a peroid of 12-18 months the WSRN will provide dual datum services. After that period, NAD83-2011 will no longer be supported. To read more about the transition plan Click here.

CURRENT NAD83-2011 Epoch 2010.00 MYSC3 Coordinates
These will be implemented on January 19, 2026 for the WSRN servers/caster at xxx.xxx.250.108 and xxx.xxxx.250.121 are NAD83-2011 Epoch 2010.00 MYCS3 (Multi Year CORS Solution). Note: this is not a datum shift, but an interim, subtle adjustment of all CORS non-CORS station coordinates. To learn more about this adjustment Click here.

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SUPERSEDED NAD83-2011 Epoch 2010.00 MYSC2 Coordinates
Superseded (as of Janaury 19, 2026) for the WSRN servers/caster at xxx.xxx.250.108 and xxx.xxxx.250.121 are NAD83-2011 Epoch 2010.00 MYCS2 (Multi Year CORS Solution). For a list of those coordinates Click here.

SUPERSEDED - NAD83-CORS96 Epoch 2002.00 Coordinates
The coordinates for the RETIRED Legacy WSRN servers/caster that used to be at xxx.xxx.250.185 are NAD83-CORS96 Epoch 2002.00. For a current list of those superseded coordinates Click here.

WSRN stations Sitelogs
For IGS-format Sitelogs (for import into post-processing software) with current NAD83-2011 Epoch 2010.00 coords for WSRN stations Click here. Then right click on any sitelog in the list to download.

WSRN stations KML file
For a KML file derived from current NAD83-2011 Epoch 2010.00 coords for WSRN stations The KML file will be at the top of 'Sitelogs' list.

WSRN stations Decimal Degrees delimited text file
For a delimited text file (in decimal degrees required for certain mapping applications) derived from current NAD83-2011 Epoch 2010.00 coords for WSRN stations Click here.

WSRN station names explained:
For an explanation of the 4-letter site codes, as brief list of station names can be downloaded here.

WSRN Contacts:
Gavin Schrock, PLS - 206-684-5630 - gavin.schrock@seattle.gov
Forest McBrian - Ph: 206-514-0237 - forest.mcbrian@seattle.gov
Hunter Eastman - Ph: 206-549-6286 - hunter.eastman@seattle.gov
Dean Huber - Ph: 206-233-7805 - dean.huber@seattle.gov

NO WARRANTIES; LIMITATION OF LIABILITY

Use of WSRN services, applications and features of this website, or any information contained on this website or through any links provided on this website is at the user's sole risk. The WSRN, WSRN partners, and Seattle Public Utilities provides WSRN Services on an 'as is' basis. Neither WSRN members, nor Seattle Public Utilities, its officers, employees, vendors, or third-party service providers (collectively or individually) makes any express or implied representation or warranty of any kind with respect to WSRN Services. By way of example and not of limitation, there is no representation or warranty (a) that WSRN Services will be uninterrupted or error-free, (b) that the results obtained from using WSRN Services will be accurate, reliable, complete or current, or (c) of merchantability or fitness for a particular purpose. WSRN Services and information related thereto are subject to change without prior notice.

Neither Seattle Public Utilities nor the subscriber, or WSRN members, is liable for any damages arising out of or in connection with WSRN Services, including without limitation mistakes, omissions, interruptions, deletion of files, errors, defects, viruses, delays in operation or transmission, or failures of the Continuously Operating Reference Stations (CORS). This is a comprehensive limitation of liability that applies to all damages of any kind, including compensatory, direct, indirect or consequential damages, loss of data, income or profit, loss of or damage to property and claims of third parties.

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