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 |
|---|---|---|---|---|---|
| 71U019 | Ontario | 030M03 | 71U019 | 43079 |
Horizontal Data
Coordinates scaled from map
| Latitude | Longitude |
|---|---|
| 43° 6' 54.0" | 79° 11' 52.8" |
| Zone | Easting (metres) | Northing (metres) | Scale |
|---|---|---|---|
| 17 | 646605.463 | 4775161.431 | 0.99986 |
Vertical Data (levelling)
| Vertical Datum | Elevation (m) | Order | Gravity (mGal) | Published | Project ID |
|---|---|---|---|---|---|
| CGVD2013 (2010.0) | 179.680 | 1st | 980378.75 | 2013 | H13ML1311 |
| CGVD28 | 180.129 | 1st | 980447.44 | 1980 | VA6U71 |
| IGLD85 | 180.152 | 1st | 980619.90 | 1992 | IGLD85AP92 |
The CGVD2013 height reported in the Vertical Data table is approximate because it is calculated from historical levelling data and not from the combination of GNSS and a geoid model.
Vertical Datum Separation
| Datum 1 − Datum 2 | Elevation 1 (m) | Elevation 2 (m) | Elevation Difference (m) | Epoch |
|---|---|---|---|---|
| CGVD28 (lev) − CGVD2013 (lev) | 180.129 | 179.680 | 0.449 | 2010.0 |
| IGLD85 (lev) − CGVD2013 (lev) | 180.152 | 179.680 | 0.472 | 2010.0 |
| IGLD85 (lev) − CGVD28 (lev) | 180.152 | 180.129 | 0.023 |
Station Marker
| Marker Type | Inspected in | Established by | Status | Comments |
|---|---|---|---|---|
| Permanent agency marker | 1971 | Canadian geodetic survey - nrcan | Good |
Location
Thorold thorold tunnel, under st. Lawrence seaway, tablet in east face of concrete guardrail at top of west end of tunnel, opposite department of transportation and communications service building, 6.7 m from centre line of road, 85 cm below top of concrete rail, 40 cm south of north end.
Use of Canadian Geodetic Survey products and data is subject to the Open Government Licence - Canada
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