Datum: North American Datum 1927 (CGQ77)

Geodetic Datum used in Canada - Quebec

North American Datum 1927 (CGQ77) is a geodetic datum first defined in 1977 and is suitable for use in Canada - Quebec.. North American Datum 1927 (CGQ77) references the Clarke 1866 ellipsoid and the Greenwich prime meridian. North American Datum 1927 (CGQ77) origin is Fundamental point: Meade's Ranch. Latitude: 39°13'26.686"N, longitude: 98°32'30.506"W (of Greenwich). North American Datum 1927 (CGQ77) is a geodetic datum for Geodetic survey, cadastre, topographic mapping, engineering survey. It was defined by information from Geodetic Service of Quebec. Contact alain.bernard@mrn.gouv.qc.ca NAD27 (CGQ77) used in Quebec for all maps at scale 1/20 000 and larger; generally for maps issued by the Quebec cartography office whose reference system is CGQ77.

Datum Details
Datum Name:	North American Datum 1927 (CGQ77)
Code:	6609
Area Of Use:	Canada - Quebec Area Details Area Name: Canada - Quebec Area Code: 1368 Description: Canada - Quebec. Extents: 62.61 ° -79.85 ° -57.11 ° 44.99 ° Meta Data Information Source: OGP Data Source: OGP Revision Date: 08/17/2011 Change Id: [2011.069]
Scope:	Geodetic survey, cadastre, topographic mapping, engineering survey.
Type:	geodetic
Realization Epoch:	1977
Origin:	Fundamental point: Meade's Ranch. Latitude: 39°13'26.686"N, longitude: 98°32'30.506"W (of Greenwich).
Ellipsoid:	Clarke 1866 Ellipsoid Details Name: Clarke 1866 Code: 7008 Shape: Ellipsoid Semi-Major Axis: 6378206.4 metre Unit Details Unit Name: metre Unit Code: 9001 Type: length Target Unit: metre Meta Data Remarks: Also known as International metre. SI standard unit. Information Source: ISO 1000. Data Source: OGP Revision Date: 06/02/1995 Semi Minor Axis: 6356583.8 metre Unit Details Unit Name: metre Unit Code: 9001 Type: length Target Unit: metre Meta Data Remarks: Also known as International metre. SI standard unit. Information Source: ISO 1000. Data Source: OGP Revision Date: 06/02/1995 Meta Data Remarks: Original definition a=20926062 and b=20855121 (British) feet. Uses Clarke's 1865 inch-metre ratio of 39.370432 to obtain metres. (Metric value then converted to US survey feet for use in the United States using 39.37 exactly giving a=20925832.16 ft US). Information Source: US Army Map Service Technical Manual No. 7; 1943. Data Source: OGP Revision Date: 06/02/1995 Change Id: [1998.340]
Prime Meridian:	Greenwich Prime Meridian Details Name: Greenwich Code: 8901 Greenwich Longitude: 0 degree Unit Details Unit Name: degree Unit Code: 9102 Type: angle Target Unit: radian Unit Details Unit Name: radian Unit Code: 9101 Type: angle Target Unit: radian Meta Data Remarks: SI standard unit. Information Source: ISO 1000:1992 Data Source: OGP Revision Date: 06/02/1995 Meta Data Remarks: = pi/180 radians Information Source: Data Source: OGP Revision Date: 11/18/2002 Change Id: [1996.220] [2002.860] Meta Data Information Source: Data Source: OGP Revision Date: 06/02/1995 Change Id: [1996.290]
Applicable CRS-s:	The following CRS are based on this datum: [NAD27(CGQ77)]
Meta Data
Remarks:	NAD27 (CGQ77) used in Quebec for all maps at scale 1/20 000 and larger; generally for maps issued by the Quebec cartography office whose reference system is CGQ77.
Information Source:	Geodetic Service of Quebec. Contact alain.bernard@mrn.gouv.qc.ca
Data Source:	OGP
Revision Date:	06/24/2008
Change Id:	[2008.045]
Alias:	Alias Naming System Remarks CGQ77 EPSG abbreviation