EPSG:6668

GEOGCS["GRS 1980(IUGG, 1980)",DATUM["D_unknown",SPHEROID["GRS80",6378137,298.257222101]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]

+proj=longlat +ellps=GRS80 +no_defs 

proj4.defs("EPSG:6668","+proj=longlat +ellps=GRS80 +no_defs");

<?xml version="1.0" encoding="UTF-8"?>
 <gml:GeodeticCRS xmlns:epsg="urn:x-ogp:spec:schema-xsd:EPSG:1.0:dataset" xmlns:gml="http://www.opengis.net/gml/3.2" xmlns:xlink="http://www.w3.org/1999/xlink" gml:id="iogp-crs-6668">
  <gml:metaDataProperty>
    <epsg:CommonMetaData>
      <epsg:type>geographic 2D</epsg:type>
      <epsg:alias alias="416" code="8763" codeSpace="urn:ogc:def:naming-system:EPSG::1046" />
      <epsg:alias alias="JGD2011 - LatLon" code="8764" codeSpace="urn:ogc:def:naming-system:EPSG::1047" />
      <epsg:informationSource>EPSG. See 3D CRS for original information source.</epsg:informationSource>
      <epsg:revisionDate>2019-07-17</epsg:revisionDate>
      <epsg:changes>
        <epsg:changeID xlink:href="urn:ogc:def:change-request:EPSG::2013.063" />
        <epsg:changeID xlink:href="urn:ogc:def:change-request:EPSG::2019.036" />
      </epsg:changes>
      <epsg:show>true</epsg:show>
      <epsg:isDeprecated>false</epsg:isDeprecated>
    </epsg:CommonMetaData>
  </gml:metaDataProperty>
  <gml:metaDataProperty>
    <epsg:CRSMetaData>
      <epsg:projectionConversion xlink:href="urn:ogc:def:coordinateOperation:EPSG::15593" />
      <epsg:sourceGeographicCRS xlink:href="urn:ogc:def:crs:EPSG::6667" />
    </epsg:CRSMetaData>
  </gml:metaDataProperty>
  <gml:identifier codeSpace="IOGP">urn:ogc:def:crs:EPSG::6668</gml:identifier>
  <gml:name>JGD2011</gml:name>
  <gml:remarks>Replaces JGD2000 (CRS code 4612) with effect from 21st October 2011.</gml:remarks>
  <gml:domainOfValidity xlink:href="urn:ogc:def:area:EPSG::1129" />
  <gml:scope>Horizontal component of 3D system.</gml:scope>
  <gml:ellipsoidalCS xlink:href="urn:ogc:def:cs:EPSG::6422" />
  <gml:geodeticDatum xlink:href="urn:ogc:def:datum:EPSG::1128" />
</gml:GeodeticCRS>

<?xml version="1.0" encoding="UTF-8"?>
 <gml:GeographicCRS gml:id="ogrcrs2978" xmlns:gml="http://www.opengis.net/gml/3.2">
  <gml:srsName>GRS 1980(IUGG, 1980)</gml:srsName>
  <gml:srsID>
    <gml:name gml:codeSpace="urn:ogc:def:crs:epsg::">6668</gml:name>
  </gml:srsID>
  <gml:usesEllipsoidalCS>
    <gml:EllipsoidalCS gml:id="ogrcrs2979">
      <gml:csName>ellipsoidal</gml:csName>
      <gml:csID>
        <gml:name gml:codeSpace="urn:ogc:def:cs:EPSG::">6402</gml:name>
      </gml:csID>
      <gml:usesAxis>
        <gml:CoordinateSystemAxis gml:id="ogrcrs2980" gml:uom="urn:ogc:def:uom:EPSG::9102">
          <gml:name>Geodetic latitude</gml:name>
          <gml:axisID>
            <gml:name gml:codeSpace="urn:ogc:def:axis:EPSG::">9901</gml:name>
          </gml:axisID>
          <gml:axisAbbrev>Lat</gml:axisAbbrev>
          <gml:axisDirection>north</gml:axisDirection>
        </gml:CoordinateSystemAxis>
      </gml:usesAxis>
      <gml:usesAxis>
        <gml:CoordinateSystemAxis gml:id="ogrcrs2981" gml:uom="urn:ogc:def:uom:EPSG::9102">
          <gml:name>Geodetic longitude</gml:name>
          <gml:axisID>
            <gml:name gml:codeSpace="urn:ogc:def:axis:EPSG::">9902</gml:name>
          </gml:axisID>
          <gml:axisAbbrev>Lon</gml:axisAbbrev>
          <gml:axisDirection>east</gml:axisDirection>
        </gml:CoordinateSystemAxis>
      </gml:usesAxis>
    </gml:EllipsoidalCS>
  </gml:usesEllipsoidalCS>
  <gml:usesGeodeticDatum>
    <gml:GeodeticDatum gml:id="ogrcrs2982">
      <gml:datumName>unknown</gml:datumName>
      <gml:usesPrimeMeridian>
        <gml:PrimeMeridian gml:id="ogrcrs2983">
          <gml:meridianName>Greenwich</gml:meridianName>
          <gml:greenwichLongitude>
            <gml:angle gml:uom="urn:ogc:def:uom:EPSG::9102">0</gml:angle>
          </gml:greenwichLongitude>
        </gml:PrimeMeridian>
      </gml:usesPrimeMeridian>
      <gml:usesEllipsoid>
        <gml:Ellipsoid gml:id="ogrcrs2984">
          <gml:ellipsoidName>GRS80</gml:ellipsoidName>
          <gml:semiMajorAxis gml:uom="urn:ogc:def:uom:EPSG::9001">6378137</gml:semiMajorAxis>
          <gml:secondDefiningParameter>
            <gml:inverseFlattening gml:uom="urn:ogc:def:uom:EPSG::9201">298.257222101</gml:inverseFlattening>
          </gml:secondDefiningParameter>
        </gml:Ellipsoid>
      </gml:usesEllipsoid>
    </gml:GeodeticDatum>
  </gml:usesGeodeticDatum>
</gml:GeographicCRS>

6668=GEOGCS["GRS 1980(IUGG, 1980)",DATUM["unknown",SPHEROID["GRS80",6378137,298.257222101]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433],AUTHORITY["epsg","6668"]]

PROJECTION
	"proj=longlat"
	"ellps=GRS80"
	"no_defs"
END

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=longlat +ellps=GRS80 +no_defs">
	<Layer srs="+proj=longlat +ellps=GRS80 +no_defs">
	</Layer>
</Map>

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 6668, 'EPSG', 6668, '+proj=longlat +ellps=GRS80 +no_defs ', 'GEOGCS["GRS 1980(IUGG, 1980)",DATUM["unknown",SPHEROID["GRS80",6378137,298.257222101]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433],AUTHORITY["epsg","6668"]]');

GEOGCS["GRS 1980(IUGG, 1980)",DATUM["unknown",SPHEROID["GRS80",6378137,298.257222101]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433],AUTHORITY["epsg","6668"]]