EPSG:27291

NZGD49 / North Island Grid

Covered area powered by MapTiler MapTiler logo

Center coordinates
281703.02122970 535125.96945428

Projected bounds:
-19709.11340104 69032.67628091
615905.55618509 989605.78327181

WGS84 bounds:
171.99 -41.67
178.63 -34.1

Selected transformation

NO DEFAULT TRANSFORMATION

Attributes

Unit: British yard (Sears 1922)

Geodetic CRS: NZGD49

Datum: New Zealand Geodetic Datum 1949

Ellipsoid: International 1924

Prime meridian: Greenwich

Data source: OGP

Revision date: 2000-10-19

Scope: Large and medium scale topographic mapping and engineering survey.

Remarks: Sears 1922 British foot-metre conversion factor applied to ellipsoid. Replaced by 27200 (GD49 / New Zealand Map Grid) in 1972.

Area of use: New Zealand - North Island.

Coordinate system: Cartesian 2D CS. Axes: easting, northing (E,N). Orientations: east, north. UoM: ydSe.

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Definition: Well Known Text (WKT)

PROJCS["NZGD49 / North Island Grid",
    GEOGCS["NZGD49",
        DATUM["New_Zealand_Geodetic_Datum_1949",
            SPHEROID["International 1924",6378388,297,
                AUTHORITY["EPSG","7022"]],
            TOWGS84[59.47,-5.04,187.44,0.47,-0.1,1.024,-4.5993],
            AUTHORITY["EPSG","6272"]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4272"]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",-39],
    PARAMETER["central_meridian",175.5],
    PARAMETER["scale_factor",1],
    PARAMETER["false_easting",300000],
    PARAMETER["false_northing",400000],
    UNIT["British yard (Sears 1922)",0.9143984146160287,
        AUTHORITY["EPSG","9040"]],
    AXIS["Easting",EAST],
    AXIS["Northing",NORTH],
    AUTHORITY["EPSG","27291"]]
PROJCS["NZGD49 / North Island Grid",
    GEOGCS["NZGD49",
        DATUM["New_Zealand_Geodetic_Datum_1949",
            SPHEROID["International 1924",6378388,297,
                AUTHORITY["EPSG","7022"]],
            TOWGS84[59.47,-5.04,187.44,0.47,-0.1,1.024,-4.5993],
            AUTHORITY["EPSG","6272"]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4272"]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",-39],
    PARAMETER["central_meridian",175.5],
    PARAMETER["scale_factor",1],
    PARAMETER["false_easting",300000],
    PARAMETER["false_northing",400000],
    UNIT["British yard (Sears 1922)",0.9143984146160287,
        AUTHORITY["EPSG","9040"]],
    AXIS["Easting",EAST],
    AXIS["Northing",NORTH],
    AUTHORITY["EPSG","27291"]]

Definition: ESRI WKT

PROJCS["NZGD49_North_Island_Grid",GEOGCS["GCS_New_Zealand_1949",DATUM["D_New_Zealand_1949",SPHEROID["International_1924",6378388,297]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",-39],PARAMETER["central_meridian",175.5],PARAMETER["scale_factor",1],PARAMETER["false_easting",300000],PARAMETER["false_northing",400000],UNIT["British yard (Sears 1922)",0.9143984146160287]]

Definition: PROJ.4

+proj=tmerc +lat_0=-39 +lon_0=175.5 +k=1 +x_0=274319.5243848086 +y_0=365759.3658464114 +ellps=intl +towgs84=59.47,-5.04,187.44,0.47,-0.1,1.024,-4.5993 +to_meter=0.9143984146160287 +no_defs 

Definition: JavaScript (Proj4js)

proj4.defs("EPSG:27291","+proj=tmerc +lat_0=-39 +lon_0=175.5 +k=1 +x_0=274319.5243848086 +y_0=365759.3658464114 +ellps=intl +towgs84=59.47,-5.04,187.44,0.47,-0.1,1.024,-4.5993 +to_meter=0.9143984146160287 +no_defs");

Definition: OGC GML

<?xml version="1.0" encoding="UTF-8"?>
 <gml:ProjectedCRS 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="epsg-crs-27291">
   <gml:metaDataProperty>
      <epsg:CommonMetaData>
         <epsg:type>projected</epsg:type>
         <epsg:alias alias="GD49 / North Island Grid" code="153" codeSpace="urn:ogc:def:naming-system:EPSG::7317" />
         <epsg:revisionDate>2000-10-19</epsg:revisionDate>
         <epsg:changes>
            <epsg:changeID xlink:href="urn:ogc:def:change-request:EPSG::1997.231" />
            <epsg:changeID xlink:href="urn:ogc:def:change-request:EPSG::2000.702" />
         </epsg:changes>
         <epsg:show>true</epsg:show>
         <epsg:isDeprecated>false</epsg:isDeprecated>
      </epsg:CommonMetaData>
   </gml:metaDataProperty>
   <gml:identifier codeSpace="OGP">urn:ogc:def:crs:EPSG::27291</gml:identifier>
   <gml:name>NZGD49 / North Island Grid</gml:name>
   <gml:remarks>Sears 1922 British foot-metre conversion factor applied to ellipsoid. Replaced by 27200 (GD49 / New Zealand Map Grid) in 1972.</gml:remarks>
   <gml:domainOfValidity xlink:href="urn:ogc:def:area:EPSG::1500" />
   <gml:scope>Large and medium scale topographic mapping and engineering survey.</gml:scope>
   <gml:conversion xlink:href="urn:ogc:def:coordinateOperation:EPSG::18141" />
   <gml:baseGeodeticCRS xlink:href="urn:ogc:def:crs:EPSG::4272" />
   <gml:cartesianCS xlink:href="urn:ogc:def:cs:EPSG::4409" />
</gml:ProjectedCRS>
<?xml version="1.0" encoding="UTF-8"?>
 <gml:ProjectedCRS 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="epsg-crs-27291">
   <gml:metaDataProperty>
      <epsg:CommonMetaData>
         <epsg:type>projected</epsg:type>
         <epsg:alias alias="GD49 / North Island Grid" code="153" codeSpace="urn:ogc:def:naming-system:EPSG::7317" />
         <epsg:revisionDate>2000-10-19</epsg:revisionDate>
         <epsg:changes>
            <epsg:changeID xlink:href="urn:ogc:def:change-request:EPSG::1997.231" />
            <epsg:changeID xlink:href="urn:ogc:def:change-request:EPSG::2000.702" />
         </epsg:changes>
         <epsg:show>true</epsg:show>
         <epsg:isDeprecated>false</epsg:isDeprecated>
      </epsg:CommonMetaData>
   </gml:metaDataProperty>
   <gml:identifier codeSpace="OGP">urn:ogc:def:crs:EPSG::27291</gml:identifier>
   <gml:name>NZGD49 / North Island Grid</gml:name>
   <gml:remarks>Sears 1922 British foot-metre conversion factor applied to ellipsoid. Replaced by 27200 (GD49 / New Zealand Map Grid) in 1972.</gml:remarks>
   <gml:domainOfValidity xlink:href="urn:ogc:def:area:EPSG::1500" />
   <gml:scope>Large and medium scale topographic mapping and engineering survey.</gml:scope>
   <gml:conversion xlink:href="urn:ogc:def:coordinateOperation:EPSG::18141" />
   <gml:baseGeodeticCRS xlink:href="urn:ogc:def:crs:EPSG::4272" />
   <gml:cartesianCS xlink:href="urn:ogc:def:cs:EPSG::4409" />
</gml:ProjectedCRS>

Definition: XML

<?xml version="1.0" encoding="UTF-8"?>
 <gml:ProjectedCRS gml:id="ogrcrs603075" xmlns:gml="http://www.opengis.net/gml/3.2">
  <gml:srsName>NZGD49 / North Island Grid</gml:srsName>
  <gml:srsID>
    <gml:name gml:codeSpace="urn:ogc:def:crs:EPSG::">27291</gml:name>
  </gml:srsID>
  <gml:baseCRS>
    <gml:GeographicCRS gml:id="ogrcrs603076">
      <gml:srsName>NZGD49</gml:srsName>
      <gml:srsID>
        <gml:name gml:codeSpace="urn:ogc:def:crs:EPSG::">4272</gml:name>
      </gml:srsID>
      <gml:usesEllipsoidalCS>
        <gml:EllipsoidalCS gml:id="ogrcrs603077">
          <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="ogrcrs603078" 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="ogrcrs603079" 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="ogrcrs603080">
          <gml:datumName>New_Zealand_Geodetic_Datum_1949</gml:datumName>
          <gml:datumID>
            <gml:name gml:codeSpace="urn:ogc:def:datum:EPSG::">6272</gml:name>
          </gml:datumID>
          <gml:usesPrimeMeridian>
            <gml:PrimeMeridian gml:id="ogrcrs603081">
              <gml:meridianName>Greenwich</gml:meridianName>
              <gml:meridianID>
                <gml:name gml:codeSpace="urn:ogc:def:meridian:EPSG::">8901</gml:name>
              </gml:meridianID>
              <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="ogrcrs603082">
              <gml:ellipsoidName>International 1924</gml:ellipsoidName>
              <gml:ellipsoidID>
                <gml:name gml:codeSpace="urn:ogc:def:ellipsoid:EPSG::">7022</gml:name>
              </gml:ellipsoidID>
              <gml:semiMajorAxis gml:uom="urn:ogc:def:uom:EPSG::9001">6378388</gml:semiMajorAxis>
              <gml:secondDefiningParameter>
                <gml:inverseFlattening gml:uom="urn:ogc:def:uom:EPSG::9201">297</gml:inverseFlattening>
              </gml:secondDefiningParameter>
            </gml:Ellipsoid>
          </gml:usesEllipsoid>
        </gml:GeodeticDatum>
      </gml:usesGeodeticDatum>
    </gml:GeographicCRS>
  </gml:baseCRS>
  <gml:definedByConversion>
    <gml:Conversion gml:id="ogrcrs603083">
      <gml:usesMethod xlink:href="urn:ogc:def:method:EPSG::9807" />
      <gml:usesParameterValue>
        <gml:value gml:uom="urn:ogc:def:uom:EPSG::9102">-39</gml:value>
        <gml:valueOfParameter xlink:href="urn:ogc:def:parameter:EPSG::8801" />
      </gml:usesParameterValue>
      <gml:usesParameterValue>
        <gml:value gml:uom="urn:ogc:def:uom:EPSG::9102">175.5</gml:value>
        <gml:valueOfParameter xlink:href="urn:ogc:def:parameter:EPSG::8802" />
      </gml:usesParameterValue>
      <gml:usesParameterValue>
        <gml:value gml:uom="urn:ogc:def:uom:EPSG::9001">1</gml:value>
        <gml:valueOfParameter xlink:href="urn:ogc:def:parameter:EPSG::8805" />
      </gml:usesParameterValue>
      <gml:usesParameterValue>
        <gml:value gml:uom="urn:ogc:def:uom:EPSG::9001">274319.5243848086</gml:value>
        <gml:valueOfParameter xlink:href="urn:ogc:def:parameter:EPSG::8806" />
      </gml:usesParameterValue>
      <gml:usesParameterValue>
        <gml:value gml:uom="urn:ogc:def:uom:EPSG::9001">365759.3658464114</gml:value>
        <gml:valueOfParameter xlink:href="urn:ogc:def:parameter:EPSG::8807" />
      </gml:usesParameterValue>
    </gml:Conversion>
  </gml:definedByConversion>
  <gml:usesCartesianCS>
    <gml:CartesianCS gml:id="ogrcrs603084">
      <gml:csName>Cartesian</gml:csName>
      <gml:csID>
        <gml:name gml:codeSpace="urn:ogc:def:cs:EPSG::">4400</gml:name>
      </gml:csID>
      <gml:usesAxis>
        <gml:CoordinateSystemAxis gml:id="ogrcrs603085" gml:uom="urn:ogc:def:uom:EPSG::9001">
          <gml:name>Easting</gml:name>
          <gml:axisID>
            <gml:name gml:codeSpace="urn:ogc:def:axis:EPSG::">9906</gml:name>
          </gml:axisID>
          <gml:axisAbbrev>E</gml:axisAbbrev>
          <gml:axisDirection>east</gml:axisDirection>
        </gml:CoordinateSystemAxis>
      </gml:usesAxis>
      <gml:usesAxis>
        <gml:CoordinateSystemAxis gml:id="ogrcrs603086" gml:uom="urn:ogc:def:uom:EPSG::9001">
          <gml:name>Northing</gml:name>
          <gml:axisID>
            <gml:name gml:codeSpace="urn:ogc:def:axis:EPSG::">9907</gml:name>
          </gml:axisID>
          <gml:axisAbbrev>N</gml:axisAbbrev>
          <gml:axisDirection>north</gml:axisDirection>
        </gml:CoordinateSystemAxis>
      </gml:usesAxis>
    </gml:CartesianCS>
  </gml:usesCartesianCS>
</gml:ProjectedCRS>
<?xml version="1.0" encoding="UTF-8"?>
 <gml:ProjectedCRS gml:id="ogrcrs603075" xmlns:gml="http://www.opengis.net/gml/3.2">
  <gml:srsName>NZGD49 / North Island Grid</gml:srsName>
  <gml:srsID>
    <gml:name gml:codeSpace="urn:ogc:def:crs:EPSG::">27291</gml:name>
  </gml:srsID>
  <gml:baseCRS>
    <gml:GeographicCRS gml:id="ogrcrs603076">
      <gml:srsName>NZGD49</gml:srsName>
      <gml:srsID>
        <gml:name gml:codeSpace="urn:ogc:def:crs:EPSG::">4272</gml:name>
      </gml:srsID>
      <gml:usesEllipsoidalCS>
        <gml:EllipsoidalCS gml:id="ogrcrs603077">
          <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="ogrcrs603078" 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="ogrcrs603079" 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="ogrcrs603080">
          <gml:datumName>New_Zealand_Geodetic_Datum_1949</gml:datumName>
          <gml:datumID>
            <gml:name gml:codeSpace="urn:ogc:def:datum:EPSG::">6272</gml:name>
          </gml:datumID>
          <gml:usesPrimeMeridian>
            <gml:PrimeMeridian gml:id="ogrcrs603081">
              <gml:meridianName>Greenwich</gml:meridianName>
              <gml:meridianID>
                <gml:name gml:codeSpace="urn:ogc:def:meridian:EPSG::">8901</gml:name>
              </gml:meridianID>
              <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="ogrcrs603082">
              <gml:ellipsoidName>International 1924</gml:ellipsoidName>
              <gml:ellipsoidID>
                <gml:name gml:codeSpace="urn:ogc:def:ellipsoid:EPSG::">7022</gml:name>
              </gml:ellipsoidID>
              <gml:semiMajorAxis gml:uom="urn:ogc:def:uom:EPSG::9001">6378388</gml:semiMajorAxis>
              <gml:secondDefiningParameter>
                <gml:inverseFlattening gml:uom="urn:ogc:def:uom:EPSG::9201">297</gml:inverseFlattening>
              </gml:secondDefiningParameter>
            </gml:Ellipsoid>
          </gml:usesEllipsoid>
        </gml:GeodeticDatum>
      </gml:usesGeodeticDatum>
    </gml:GeographicCRS>
  </gml:baseCRS>
  <gml:definedByConversion>
    <gml:Conversion gml:id="ogrcrs603083">
      <gml:usesMethod xlink:href="urn:ogc:def:method:EPSG::9807" />
      <gml:usesParameterValue>
        <gml:value gml:uom="urn:ogc:def:uom:EPSG::9102">-39</gml:value>
        <gml:valueOfParameter xlink:href="urn:ogc:def:parameter:EPSG::8801" />
      </gml:usesParameterValue>
      <gml:usesParameterValue>
        <gml:value gml:uom="urn:ogc:def:uom:EPSG::9102">175.5</gml:value>
        <gml:valueOfParameter xlink:href="urn:ogc:def:parameter:EPSG::8802" />
      </gml:usesParameterValue>
      <gml:usesParameterValue>
        <gml:value gml:uom="urn:ogc:def:uom:EPSG::9001">1</gml:value>
        <gml:valueOfParameter xlink:href="urn:ogc:def:parameter:EPSG::8805" />
      </gml:usesParameterValue>
      <gml:usesParameterValue>
        <gml:value gml:uom="urn:ogc:def:uom:EPSG::9001">274319.5243848086</gml:value>
        <gml:valueOfParameter xlink:href="urn:ogc:def:parameter:EPSG::8806" />
      </gml:usesParameterValue>
      <gml:usesParameterValue>
        <gml:value gml:uom="urn:ogc:def:uom:EPSG::9001">365759.3658464114</gml:value>
        <gml:valueOfParameter xlink:href="urn:ogc:def:parameter:EPSG::8807" />
      </gml:usesParameterValue>
    </gml:Conversion>
  </gml:definedByConversion>
  <gml:usesCartesianCS>
    <gml:CartesianCS gml:id="ogrcrs603084">
      <gml:csName>Cartesian</gml:csName>
      <gml:csID>
        <gml:name gml:codeSpace="urn:ogc:def:cs:EPSG::">4400</gml:name>
      </gml:csID>
      <gml:usesAxis>
        <gml:CoordinateSystemAxis gml:id="ogrcrs603085" gml:uom="urn:ogc:def:uom:EPSG::9001">
          <gml:name>Easting</gml:name>
          <gml:axisID>
            <gml:name gml:codeSpace="urn:ogc:def:axis:EPSG::">9906</gml:name>
          </gml:axisID>
          <gml:axisAbbrev>E</gml:axisAbbrev>
          <gml:axisDirection>east</gml:axisDirection>
        </gml:CoordinateSystemAxis>
      </gml:usesAxis>
      <gml:usesAxis>
        <gml:CoordinateSystemAxis gml:id="ogrcrs603086" gml:uom="urn:ogc:def:uom:EPSG::9001">
          <gml:name>Northing</gml:name>
          <gml:axisID>
            <gml:name gml:codeSpace="urn:ogc:def:axis:EPSG::">9907</gml:name>
          </gml:axisID>
          <gml:axisAbbrev>N</gml:axisAbbrev>
          <gml:axisDirection>north</gml:axisDirection>
        </gml:CoordinateSystemAxis>
      </gml:usesAxis>
    </gml:CartesianCS>
  </gml:usesCartesianCS>
</gml:ProjectedCRS>

Definition: GeoServer

27291=PROJCS["NZGD49 / North Island Grid",GEOGCS["NZGD49",DATUM["New_Zealand_Geodetic_Datum_1949",SPHEROID["International 1924",6378388,297,AUTHORITY["EPSG","7022"]],TOWGS84[59.47,-5.04,187.44,0.47,-0.1,1.024,-4.5993],AUTHORITY["EPSG","6272"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4272"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",-39],PARAMETER["central_meridian",175.5],PARAMETER["scale_factor",1],PARAMETER["false_easting",300000],PARAMETER["false_northing",400000],UNIT["British yard (Sears 1922)",0.9143984146160287,AUTHORITY["EPSG","9040"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","27291"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=tmerc"
	"lat_0=-39"
	"lon_0=175.5"
	"k=1"
	"x_0=274319.5243848086"
	"y_0=365759.3658464114"
	"ellps=intl"
	"towgs84=59.47,-5.04,187.44,0.47,-0.1,1.024,-4.5993"
	"to_meter=0.9143984146160287"
	"no_defs"
END

Definition: MapServer - Python

wkt = '''PROJCS["NZGD49 / North Island Grid",GEOGCS["NZGD49",DATUM["New_Zealand_Geodetic_Datum_1949",SPHEROID["International 1924",6378388,297,AUTHORITY["EPSG","7022"]],TOWGS84[59.47,-5.04,187.44,0.47,-0.1,1.024,-4.5993],AUTHORITY["EPSG","6272"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4272"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",-39],PARAMETER["central_meridian",175.5],PARAMETER["scale_factor",1],PARAMETER["false_easting",300000],PARAMETER["false_northing",400000],UNIT["British yard (Sears 1922)",0.9143984146160287,AUTHORITY["EPSG","9040"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","27291"]]'''
m = mapObj('')
m.setWKTProjection(ref.ExportToWkt())
lyr = layerObj(m)
lyr.setWKTProjection(ref.ExportToWkt())

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=tmerc +lat_0=-39 +lon_0=175.5 +k=1 +x_0=274319.5243848086 +y_0=365759.3658464114 +ellps=intl +towgs84=59.47,-5.04,187.44,0.47,-0.1,1.024,-4.5993 +to_meter=0.9143984146160287 +no_defs">
	<Layer srs="+proj=tmerc +lat_0=-39 +lon_0=175.5 +k=1 +x_0=274319.5243848086 +y_0=365759.3658464114 +ellps=intl +towgs84=59.47,-5.04,187.44,0.47,-0.1,1.024,-4.5993 +to_meter=0.9143984146160287 +no_defs">
	</Layer>
</Map>

Definition: Mapnik - Python

proj4 = '+proj=tmerc +lat_0=-39 +lon_0=175.5 +k=1 +x_0=274319.5243848086 +y_0=365759.3658464114 +ellps=intl +towgs84=59.47,-5.04,187.44,0.47,-0.1,1.024,-4.5993 +to_meter=0.9143984146160287 +no_defs'
m = Map(256,256,proj4)
lyr = Layer('Name',proj4)

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 27291, 'EPSG', 27291, '+proj=tmerc +lat_0=-39 +lon_0=175.5 +k=1 +x_0=274319.5243848086 +y_0=365759.3658464114 +ellps=intl +towgs84=59.47,-5.04,187.44,0.47,-0.1,1.024,-4.5993 +to_meter=0.9143984146160287 +no_defs ', 'PROJCS["NZGD49 / North Island Grid",GEOGCS["NZGD49",DATUM["New_Zealand_Geodetic_Datum_1949",SPHEROID["International 1924",6378388,297,AUTHORITY["EPSG","7022"]],TOWGS84[59.47,-5.04,187.44,0.47,-0.1,1.024,-4.5993],AUTHORITY["EPSG","6272"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4272"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",-39],PARAMETER["central_meridian",175.5],PARAMETER["scale_factor",1],PARAMETER["false_easting",300000],PARAMETER["false_northing",400000],UNIT["British yard (Sears 1922)",0.9143984146160287,AUTHORITY["EPSG","9040"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","27291"]]');

Definition: OGC WKT

PROJCS["NZGD49 / North Island Grid",GEOGCS["NZGD49",DATUM["New_Zealand_Geodetic_Datum_1949",SPHEROID["International 1924",6378388,297,AUTHORITY["EPSG","7022"]],TOWGS84[59.47,-5.04,187.44,0.47,-0.1,1.024,-4.5993],AUTHORITY["EPSG","6272"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4272"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",-39],PARAMETER["central_meridian",175.5],PARAMETER["scale_factor",1],PARAMETER["false_easting",300000],PARAMETER["false_northing",400000],UNIT["British yard (Sears 1922)",0.9143984146160287,AUTHORITY["EPSG","9040"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","27291"]]

Definition: USGS

[9, 0, (0.0, 0.0, 1.0, 0.0, 175030000.0, -39000000.0, 274319.5243848086, 365759.36584641144, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0), 4]