Station Report
Geoid velocity added
To correct for the vertical drift between reference frames, the velocity of the geoid height (VN) is now calculated and incorporated into the calculation of the orthometric height. View documentation to learn more.
Site Identification
| Name | Province | NTS map sheet | Unique Number | Provincial Identifier | Network |
|---|---|---|---|---|---|
| ALRT CACS-CHS | Nunavut | 120E05 | M029001 | ALRT | REGIONAL |
Station Coordinates
Changing these fields will auto-update the station coordinate information below.
The velocities are interpolated from the national Velocity Grid version 7.0.
| Latitude | |
|---|---|
| Longitude | |
| h (metres) | |
| Vφ (mm/y) | |
| Vλ (mm/y) | |
| Vh (mm/y) | |
| X (metres) | |
| Y (metres) | |
| Z (metres) | |
| Vx (mm/y) | |
| Vy (mm/y) | |
| Vz (mm/y) | |
| Zone | |
| Easting (metres) | |
| Northing (metres) | |
| h (metres) | |
| Scale | |
| Combined | |
| Convergence | |
| N (metres) | |
| H (metres) | |
| Published date Project ID | 2023-09-05 M18-020 |
| VN (mm/year) | |
| VH (mm/year) | |
| Equipot. of geoid model (W0, m2s-2) |
Vertical Data (levelling)
Use the value of H from the coordinates above.
Vertical Datum Separation
Use the value of H from the coordinates above.
Location
ALRT is a continuously tracking GNSS station and is part of the Canadian Active Control System (CACS). The station is located at Canadian Forces Station Alert in the community of Alert, Ellesmere Island, Nunavut. The receiver is located in the Canadian Hydrographic Service tide gauge building.
The GNSS reference mark consists of a brass plate with a forced centered stainless steel bolt cemented on top of a 0.127 m diameter, 8m long galvanized steel pipe, set in shale and permafrost to a depth of 6m. A slurry was poured into the pipe to ground level and insulation added to 0.3m from the top. Cement was used to top off the remaining part for setting the brass plate. A 0.25 m diameter culvert was placed around the pipe and filled with sand, and a 0.8m high, 3m square berme built around it.
Equipment on site
| Model/Type | Start date | |
|---|---|---|
| Receiver | SEPT POLARX5 | 2019-08-09 13:37:00 |
| Clock | Internal | 2002-07-16 00:00:00 |
Antenna
| Model | Start date | Height (m) | Phase center offset (mm) | |||
|---|---|---|---|---|---|---|
| GPS L1 | GPS L2 | GLONASS L1 | GLONASS L2 | |||
| ASH701945D_M NONE | 2002-07-16 00:00:00 | 0.100 | 89.85 | 115.99 | 89.85 | 115.99 |
Use of Canadian Geodetic Survey products and data is subject to the Open Government Licence - Canada
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