Geodetic CRS: NAD27(CGQ77)
Datum: North American Datum 1927 (CGQ77)
Ellipsoid: Clarke 1866
Prime meridian: Greenwich
Data source: OGP
Information source: OGP
Revision date: 2019-09-17
Scope: Approximation at the +/- 1m level.
Remarks: Parameter file is from NAD27(CGQ77) to NAD83(CSRS) (1) (code 1845) assuming that NAD83(CSRS98) is equivalent to WGS 84 within the accuracy of the transformation. Also distributed with file name CGQ77-98.gsb.
Method: NTv2
Area of use: Canada - Quebec.
Description: CQ77NA83.GSB
Definition: OGP XML
<?xml version="1.0" encoding="UTF-8"?> <gml:Transformation xmlns:epsg="urn:x-ogp:spec:schema-xsd:EPSG:1.0:dataset" xmlns:gco="http://www.isotc211.org/2005/gco" xmlns:gmd="http://www.isotc211.org/2005/gmd" xmlns:gml="http://www.opengis.net/gml/3.2" xmlns:xlink="http://www.w3.org/1999/xlink" gml:id="iogp-op-1691"> <gml:metaDataProperty> <epsg:CommonMetaData> <epsg:type>transformation</epsg:type> <epsg:informationSource>OGP</epsg:informationSource> <epsg:revisionDate>2019-09-17</epsg:revisionDate> <epsg:changes> <epsg:changeID xlink:href="urn:ogc:def:change-request:EPSG::2019.034" /> </epsg:changes> <epsg:show>true</epsg:show> <epsg:isDeprecated>false</epsg:isDeprecated> </epsg:CommonMetaData> </gml:metaDataProperty> <gml:metaDataProperty> <epsg:CoordinateOperationMetaData> <epsg:variant>3</epsg:variant> </epsg:CoordinateOperationMetaData> </gml:metaDataProperty> <gml:identifier codeSpace="IOGP">urn:ogc:def:coordinateOperation:EPSG::1691</gml:identifier> <gml:name>NAD27(CGQ77) to WGS 84 (3)</gml:name> <gml:remarks>Parameter file is from NAD27(CGQ77) to NAD83(CSRS) (1) (code 1845) assuming that NAD83(CSRS98) is equivalent to WGS 84 within the accuracy of the transformation. Also distributed with file name CGQ77-98.gsb.</gml:remarks> <gml:domainOfValidity xlink:href="urn:ogc:def:area:EPSG::1368" /> <gml:scope>Approximation at the +/- 1m level.</gml:scope> <gml:operationVersion>EPSG-Can Qc NT2</gml:operationVersion> <gml:coordinateOperationAccuracy> <gmd:DQ_RelativeInternalPositionalAccuracy> <gmd:result> <gmd:DQ_QuantitativeResult> <gmd:valueUnit xlink:href="urn:ogc:def:uom:EPSG::9001" /> <gmd:value> <gco:Record> <gco:Decimal>1</gco:Decimal> </gco:Record> </gmd:value> </gmd:DQ_QuantitativeResult> </gmd:result> </gmd:DQ_RelativeInternalPositionalAccuracy> </gml:coordinateOperationAccuracy> <gml:sourceCRS xlink:href="urn:ogc:def:crs:EPSG::4609" /> <gml:targetCRS xlink:href="urn:ogc:def:crs:EPSG::4326" /> <gml:method xlink:href="urn:ogc:def:method:EPSG::9615" /> <gml:parameterValue> <gml:ParameterValue> <gml:valueFile>CQ77NA83.GSB</gml:valueFile> <gml:operationParameter xlink:href="urn:ogc:def:parameter:EPSG::8656" /> </gml:ParameterValue> </gml:parameterValue> </gml:Transformation>