***ITRF2020***
                WILLIAMS LAKE (WILL),  BRITISH COLUMBIA

 Retrieved from NGS DataBase on 08/19/25 at 16:03:15.
 _____________________________________________________________________________ 
|                                                                             |
|         Antenna Reference Point(ARP): WILLIAMS LAKE CORS ARP                |
|         ----------------------------------------------------                |
|                             PID = DE6618                                    |
|                                                                             |
|                                                                             |
| ITRF2020 POSITION (EPOCH 2020.0)                                            |
| Published by the IGS in Dec. 2023 using data through gpswk 2295.            |
|     X =  -2084258.429 m     latitude    =  52 14 12.71861 N                 |
|     Y =  -3313873.043 m     longitude   = 122 10 04.13432 W                 |
|     Z =   5019853.016 m     ellipsoid height = 1095.774   m                 |
|                                                                             |
| ITRF2020 VELOCITY                                                           |
| Published by the IGS in Dec. 2023 using data through gpswk 2295.            |
|     VX =  -0.0176 m/yr      northward =  -0.0116 m/yr                       |
|     VY =  -0.0008 m/yr      eastward  =  -0.0145 m/yr                       |
|     VZ =  -0.0059 m/yr      upward    =   0.0015 m/yr                       |
|                                                                             |
|                                                                             |
| NAD_83 (2011) POSITION (EPOCH 2010.0)                                       |
| Transformed from ITRF2020 (epoch 2020.0) position in Apr 2025.              |
|     X =  -2084257.415 m     latitude    =  52 14 12.70681 N                 |
|     Y =  -3313874.183 m     longitude   = 122 10 04.05711 W                 |
|     Z =   5019852.968 m     ellipsoid height = 1095.995   m                 |
|                                                                             |
| NAD_83 (2011) VELOCITY                                                      |
| Transformed from ITRF2020 velocity in Apr 2025.                             |
|     VX =   0.0026 m/yr      northward =   0.0017 m/yr                       |
|     VY =  -0.0002 m/yr      eastward  =   0.0023 m/yr                       |
|     VZ =   0.0012 m/yr      upward    =   0.0002 m/yr                       |
|_____________________________________________________________________________|
|                                                                             |
| L1 Phase Center of the current GPS antenna: WILLIAMS LAKE CORS L1PC         |
| ----------------------------------------------------------------------      |
| The multi-constellation choke ring GPS L1/L2 antenna                        |
| (Antenna Code = SEPCHOKE_B3E6   SPKE) was installed on 31Aug2021.           |
|        The L2 phase center is 0.014 m above the L1 phase center.            |
|                             PID = DS3598                                    |
|                                                                             |
|                                                                             |
| ITRF2020 POSITION (EPOCH 2020.0)                                            |
| Published by the IGS in Dec. 2023 using data through gpswk 2295.            |
|     X =  -2084258.471 m     latitude    =  52 14 12.71863 N                 |
|     Y =  -3313873.109 m     longitude   = 122 10 04.13435 W                 |
|     Z =   5019853.117 m     ellipsoid height = 1095.901   m                 |
|                                                                             |
| The ITRF2020 VELOCITY of the L1 PC is the same as that for the ARP.         |
|                                                                             |
|                                                                             |
| NAD_83 (2011) POSITION (EPOCH 2010.0)                                       |
| Transformed from ITRF2020 (epoch 2020.0) position in Apr 2025.              |
|     X =  -2084257.456 m     latitude    =  52 14 12.70684 N                 |
|     Y =  -3313874.248 m     longitude   = 122 10 04.05714 W                 |
|     Z =   5019853.069 m     ellipsoid height = 1096.123   m                 |
|                                                                             |
| The NAD_83 (2011) VELOCITY of the L1 PC is the same as that for the ARP.    |
|_____________________________________________________________________________|
|                                                                             |
|         Monument: WILLIAMS LAKE CORS MON.                                   |
|         ---------------------------------                                   |
|                             PID = DE6620                                    |
|         Inscribed: UNKNOWN                                                  |
|                                                                             |
|                                                                             |
| ITRF2020 POSITION (EPOCH 2020.0)                                            |
| Published by the IGS in Dec. 2023 using data through gpswk 2295.            |
|     X =  -2084258.404 m     latitude    =  52 14 12.71860 N                 |
|     Y =  -3313873.003 m     longitude   = 122 10 04.13432 W                 |
|     Z =   5019852.955 m     ellipsoid height = 1095.696   m                 |
|                                                                             |
| The ITRF2020 VELOCITY of the monument is the same as that for the ARP.      |
|                                                                             |
|                                                                             |
| NAD_83 (2011) POSITION (EPOCH 2010.0)                                       |
| Transformed from ITRF2020 (epoch 2020.0) position in Apr 2025.              |
|     X =  -2084257.390 m     latitude    =  52 14 12.70681 N                 |
|     Y =  -3313874.143 m     longitude   = 122 10 04.05711 W                 |
|     Z =   5019852.907 m     ellipsoid height = 1095.918   m                 |
|                                                                             |
| The NAD_83 (2011) VELOCITY of the monument is the same as that for the ARP. |
|_____________________________________________________________________________|


 * Latitude, longitude and ellipsoid height are computed from their
   corresponding cartesian coordinates using dimensions for the
   GRS 80 ellipsoid: semi-major axis = 6,378,137.0 meters
                          flattening = 1/298.257222101...


 * WARNING: Mixing of antenna types can lead to errors of up to 10 cm.
   in height unless antenna-phase-center variation and antenna-phase-center
   offset are properly modeled.  See next comment.

 * The coordinates shown on this page were computed using absolute antenna
   calibrations.  CORS coordinates began using absolute antenna calibrations
   beginning with IGS08 and NAD 83 (2011, MA11, PA11).  For additional
   information on the derivation of these positions and velocities and
   antenna calibrations consult:
   https://geodesy.noaa.gov/CORS/index.shtml
   https://geodesy.noaa.gov/ANTCAL/


 * For more site specific information on the equipment history and
   monumentation type consult:
   https://geodesy.noaa.gov/corsdata/station_log/will.log.txt
   https://geodesy.noaa.gov/CORS/ncn_station_pages/index.html?stationID=will


 * The NAD_83 position & velocity were revised in Mar. 2002.
 * The ITRF00 position was revised in Nov. 2006.
 * The position & velocity were revised in Aug 2011.
 * The position & velocity were revised in Jun 2019.
 * The position & velocity were revised in May 2020.
 * The position & velocity were revised in Apr 2025.