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.
North American Datum 1927 (CGQ77)
Datum Details
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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 ° |
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-57.1 ° |
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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
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Unit Name: | degree |
Unit Code: | 9102 |
Type: | angle |
Target Unit: | radian
Unit Details
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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 |
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