EPSG:8676

Canada velocity grid v6

Attributes

Geodetic CRS: NAD83(CSRS)v6

Datum: North American Datum of 1983 (CSRS) version 6

Ellipsoid: GRS 1980

Prime meridian: Greenwich

Data source: EPSG

Information source: Canadian Geodetic Survey, Natural Resources Canada.

Revision date: 2024-03-16

Scope: Change of coordinate epoch in 3-dimensions (φλh).

Remarks: File initially published as cvg60.cvb, later renamed to NAD83v60VG.gvb with no change of content. Not recommended for height transformation north of 60°N due to due to inaccuracies in the vertical component of the velocity model. Replaced by v7 model.

Method: Point motion by grid (NTv2_Vel)

Area of use: Canada - onshore south of 60°N - Alberta, British Columbia (BC), Manitoba, New Brunswick (NB), Newfoundland and Labrador, Nova Scotia (NS), Ontario, Prince Edward Island (PEI), Quebec and Saskatchewan.

Description: (0,)

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Definition: OGC Well Known Text 2 (2019)

POINTMOTIONOPERATION["Canada velocity grid v6",
    VERSION["NRC-Can cvg6.0"],
    SOURCECRS[
        GEOGCRS["NAD83(CSRS)v6",
            DATUM["North American Datum of 1983 (CSRS) version 6",
                ELLIPSOID["GRS 1980",6378137,298.257222101,
                    LENGTHUNIT["metre",1]],
                ANCHOREPOCH[2010]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            CS[ellipsoidal,3],
                AXIS["geodetic latitude (Lat)",north,
                    ORDER[1],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["geodetic longitude (Lon)",east,
                    ORDER[2],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["ellipsoidal height (h)",up,
                    ORDER[3],
                    LENGTHUNIT["metre",1]],
            ID["EPSG",8251]]],
    METHOD["Point motion by grid (NTv2_Vel)",
        ID["EPSG",1070]],
    PARAMETERFILE["Point motion velocity grid file","NAD83v6VG.gvb"],
    OPERATIONACCURACY[0.01],
    USAGE[
        SCOPE["Change of coordinate epoch in 3-dimensions (φλh)."],
        AREA["Canada - onshore south of 60°N - Alberta, British Columbia (BC), Manitoba, New Brunswick (NB), Newfoundland and Labrador, Nova Scotia (NS), Ontario, Prince Edward Island (PEI), Quebec and Saskatchewan."],
        BBOX[41.67,-139.04,60.01,-52.54]],
    USAGE[
        SCOPE["Change of coordinate epoch in 2-dimensions (φλ horizontal only)."],
        AREA["Canada - onshore north of 60°N - Newfoundland and Labrador; Northwest Territories (NWT); Nunavut; Quebec; Yukon."],
        BBOX[59.99,-141.01,83.17,-60.72]],
    ID["EPSG",8676],
    REMARK["File initially published as cvg60.cvb, later renamed to NAD83v60VG.gvb with no change of content. Not recommended for height transformation north of 60°N due to due to inaccuracies in the vertical component of the velocity model. Replaced by v7 model."]]

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "PointMotionOperation",
    "name": "Canada velocity grid v6",
    "source_crs": {
        "type": "GeographicCRS",
        "name": "NAD83(CSRS)v6",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "North American Datum of 1983 (CSRS) version 6",
            "anchor_epoch": 2010,
            "ellipsoid": {
                "name": "GRS 1980",
                "semi_major_axis": 6378137,
                "inverse_flattening": 298.257222101
            }
        },
        "coordinate_system": {
            "subtype": "ellipsoidal",
            "axis": [
                {
                    "name": "Geodetic latitude",
                    "abbreviation": "Lat",
                    "direction": "north",
                    "unit": "degree"
                },
                {
                    "name": "Geodetic longitude",
                    "abbreviation": "Lon",
                    "direction": "east",
                    "unit": "degree"
                },
                {
                    "name": "Ellipsoidal height",
                    "abbreviation": "h",
                    "direction": "up",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 8251
        }
    },
    "method": {
        "name": "Point motion by grid (NTv2_Vel)",
        "id": {
            "authority": "EPSG",
            "code": 1070
        }
    },
    "parameters": [
        {
            "name": "Point motion velocity grid file",
            "value": "NAD83v6VG.gvb",
            "id": {
                "authority": "EPSG",
                "code": 1050
            }
        }
    ],
    "accuracy": "0.01",
    "usages": [
        {
            "scope": "Change of coordinate epoch in 3-dimensions (φλh).",
            "area": "Canada - onshore south of 60°N - Alberta, British Columbia (BC), Manitoba, New Brunswick (NB), Newfoundland and Labrador, Nova Scotia (NS), Ontario, Prince Edward Island (PEI), Quebec and Saskatchewan.",
            "bbox": {
                "south_latitude": 41.67,
                "west_longitude": -139.04,
                "north_latitude": 60.01,
                "east_longitude": -52.54
            }
        },
        {
            "scope": "Change of coordinate epoch in 2-dimensions (φλ horizontal only).",
            "area": "Canada - onshore north of 60°N - Newfoundland and Labrador; Northwest Territories (NWT); Nunavut; Quebec; Yukon.",
            "bbox": {
                "south_latitude": 59.99,
                "west_longitude": -141.01,
                "north_latitude": 83.17,
                "east_longitude": -60.72
            }
        }
    ],
    "id": {
        "authority": "EPSG",
        "code": 8676
    },
    "remarks": "File initially published as cvg60.cvb, later renamed to NAD83v60VG.gvb with no change of content. Not recommended for height transformation north of 60°N due to due to inaccuracies in the vertical component of the velocity model. Replaced by v7 model."
}

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 8676, 'EPSG', 8676, 'None', 'None');