Datum: North American Datum 1927 (CGQ77)

Geodetic Datum used in Canada - Quebec

North American Datum 1927 (CGQ77) is a geodetic datum first defined in 1977-01-01 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: 62.62 ° -79.85 ° -57.1 ° 44.99 ° Meta Data Information Source: OGP Data Source: OGP Revision Date: April 24, 2018 Change Id: [2011.069] [2014.024]
Scope:	Geodetic survey, cadastre, topographic mapping, engineering survey.
Type:	geodetic
Realization Epoch:	1977-01-01
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: IOGP Revision Date: April 24, 2018 Change Id: [2015.062] 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: IOGP Revision Date: April 24, 2018 Change Id: [2015.062] 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 US and international feet for use in Cayman Islands). Information Source: US Army Map Service Technical Manual No. 7; 1943. Data Source: OGP Revision Date: April 24, 2018 Change Id: [1998.340] [2012.095]
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: IOGP Revision Date: April 24, 2018 Change Id: [2015.062] Meta Data Remarks: = pi/180 radians Information Source: Data Source: IOGP Revision Date: April 24, 2018 Change Id: [1996.220] [2002.860] [2015.062] Meta Data Remarks: The international reference meridian as defined first by the 1884 International Meridian Conference and later by the Bureau International de l'Heure (BIH) and then the International Earth Rotation Service (IERS). Information Source: OGP Data Source: IOGP Revision Date: April 24, 2018 Change Id: [1996.290] [2016.045]
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:	April 24, 2018
Change Id:	[2008.045]
Alias:	Alias Naming System Remarks CGQ77 EPSG abbreviation D_NAD_1927_CGQ77 ESRI