EPSG:19911

Laborde Grid approximation

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Attributes

Data source: OGP

Information source: OGP

Revision date: 2007-01-11

Scope: Medium scale topographic mapping.

Remarks: Longitude is referenced to the Paris meridian. The conversion method is a good approximation (better than 5cm) to original formula (see proj code 19861) within a few hundred km of origin, but farther away the approximation may be no better than 1m.

Method: Hotine Oblique Mercator (variant B)

Area of use: Madagascar - onshore and nearshore.

Description: (-21.0, 49.0, 21.0, 21.0, 0.9995, 400000.0, 800000.0)

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Madagascar - onshore and nearshore.

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Definition: OGP XML

<div class="syntax"><pre><span class="cp">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span> <span class="nt">&lt;gml:Conversion</span> <span class="na">xmlns:epsg=</span><span class="s">&quot;urn:x-ogp:spec:schema-xsd:EPSG:1.0:dataset&quot;</span> <span class="na">xmlns:gco=</span><span class="s">&quot;http://www.isotc211.org/2005/gco&quot;</span> <span class="na">xmlns:gmd=</span><span class="s">&quot;http://www.isotc211.org/2005/gmd&quot;</span> <span class="na">xmlns:gml=</span><span class="s">&quot;http://www.opengis.net/gml/3.2&quot;</span> <span class="na">xmlns:xlink=</span><span class="s">&quot;http://www.w3.org/1999/xlink&quot;</span> <span class="na">gml:id=</span><span class="s">&quot;epsg-op-19911&quot;</span><span class="nt">&gt;</span> <span class="nt">&lt;gml:metaDataProperty&gt;</span> <span class="nt">&lt;epsg:CommonMetaData&gt;</span> <span class="nt">&lt;epsg:type&gt;</span>conversion<span class="nt">&lt;/epsg:type&gt;</span> <span class="nt">&lt;epsg:alias</span> <span class="na">alias=</span><span class="s">&quot;Laborde Grid&quot;</span> <span class="na">code=</span><span class="s">&quot;3481&quot;</span> <span class="na">codeSpace=</span><span class="s">&quot;urn:ogc:def:naming-system:EPSG::7301&quot;</span> <span class="nt">/&gt;</span> <span class="nt">&lt;epsg:informationSource&gt;</span>OGP<span class="nt">&lt;/epsg:informationSource&gt;</span> <span class="nt">&lt;epsg:revisionDate&gt;</span>2007-01-11<span class="nt">&lt;/epsg:revisionDate&gt;</span> <span class="nt">&lt;epsg:changes&gt;</span> <span class="nt">&lt;epsg:changeID</span> <span class="na">xlink:href=</span><span class="s">&quot;urn:ogc:def:change-request:EPSG::1997.613&quot;</span> <span class="nt">/&gt;</span> <span class="nt">&lt;epsg:changeID</span> <span class="na">xlink:href=</span><span class="s">&quot;urn:ogc:def:change-request:EPSG::2003.020&quot;</span> <span class="nt">/&gt;</span> <span class="nt">&lt;epsg:changeID</span> <span class="na">xlink:href=</span><span class="s">&quot;urn:ogc:def:change-request:EPSG::2006.960&quot;</span> <span class="nt">/&gt;</span> <span class="nt">&lt;/epsg:changes&gt;</span> <span class="nt">&lt;epsg:show&gt;</span>true<span class="nt">&lt;/epsg:show&gt;</span> <span class="nt">&lt;epsg:isDeprecated&gt;</span>false<span class="nt">&lt;/epsg:isDeprecated&gt;</span> <span class="nt">&lt;/epsg:CommonMetaData&gt;</span> <span class="nt">&lt;/gml:metaDataProperty&gt;</span> <span class="nt">&lt;gml:identifier</span> <span class="na">codeSpace=</span><span class="s">&quot;OGP&quot;</span><span class="nt">&gt;</span>urn:ogc:def:coordinateOperation:EPSG::19911<span class="nt">&lt;/gml:identifier&gt;</span> <span class="nt">&lt;gml:name&gt;</span>Laborde Grid approximation<span class="nt">&lt;/gml:name&gt;</span> <span class="nt">&lt;gml:remarks&gt;</span>Longitude is referenced to the Paris meridian. The conversion method is a good approximation (better than 5cm) to original formula (see proj code 19861) within a few hundred km of origin, but farther away the approximation may be no better than 1m.<span class="nt">&lt;/gml:remarks&gt;</span> <span class="nt">&lt;gml:domainOfValidity</span> <span class="na">xlink:href=</span><span class="s">&quot;urn:ogc:def:area:EPSG::1149&quot;</span> <span class="nt">/&gt;</span> <span class="nt">&lt;gml:scope&gt;</span>Medium scale topographic mapping.<span class="nt">&lt;/gml:scope&gt;</span> <span class="nt">&lt;gml:coordinateOperationAccuracy&gt;</span> <span class="nt">&lt;gmd:DQ_RelativeInternalPositionalAccuracy&gt;</span> <span class="nt">&lt;gmd:result&gt;</span> <span class="nt">&lt;gmd:DQ_QuantitativeResult&gt;</span> <span class="nt">&lt;gmd:valueUnit</span> <span class="na">xlink:href=</span><span class="s">&quot;urn:ogc:def:uom:EPSG::9001&quot;</span> <span class="nt">/&gt;</span> <span class="nt">&lt;gmd:value&gt;</span> <span class="nt">&lt;gco:Record&gt;</span> <span class="nt">&lt;gco:Decimal&gt;</span>0<span class="nt">&lt;/gco:Decimal&gt;</span> <span class="nt">&lt;/gco:Record&gt;</span> <span class="nt">&lt;/gmd:value&gt;</span> <span class="nt">&lt;/gmd:DQ_QuantitativeResult&gt;</span> <span class="nt">&lt;/gmd:result&gt;</span> <span class="nt">&lt;/gmd:DQ_RelativeInternalPositionalAccuracy&gt;</span> <span class="nt">&lt;/gml:coordinateOperationAccuracy&gt;</span> <span class="nt">&lt;gml:method</span> <span class="na">xlink:href=</span><span class="s">&quot;urn:ogc:def:method:EPSG::9815&quot;</span> <span class="nt">/&gt;</span> <span class="nt">&lt;gml:parameterValue&gt;</span> <span class="nt">&lt;gml:ParameterValue&gt;</span> <span class="nt">&lt;gml:value</span> <span class="na">uom=</span><span class="s">&quot;urn:ogc:def:uom:EPSG::9105&quot;</span><span class="nt">&gt;</span>-21<span class="nt">&lt;/gml:value&gt;</span> <span class="nt">&lt;gml:operationParameter</span> <span class="na">xlink:href=</span><span class="s">&quot;urn:ogc:def:parameter:EPSG::8811&quot;</span> <span class="nt">/&gt;</span> <span class="nt">&lt;/gml:ParameterValue&gt;</span> <span class="nt">&lt;/gml:parameterValue&gt;</span> <span class="nt">&lt;gml:parameterValue&gt;</span> <span class="nt">&lt;gml:ParameterValue&gt;</span> <span class="nt">&lt;gml:value</span> <span class="na">uom=</span><span class="s">&quot;urn:ogc:def:uom:EPSG::9105&quot;</span><span class="nt">&gt;</span>49<span class="nt">&lt;/gml:value&gt;</span> <span class="nt">&lt;gml:operationParameter</span> <span class="na">xlink:href=</span><span class="s">&quot;urn:ogc:def:parameter:EPSG::8812&quot;</span> <span class="nt">/&gt;</span> <span class="nt">&lt;/gml:ParameterValue&gt;</span> <span class="nt">&lt;/gml:parameterValue&gt;</span> <span class="nt">&lt;gml:parameterValue&gt;</span> <span class="nt">&lt;gml:ParameterValue&gt;</span> <span class="nt">&lt;gml:value</span> <span class="na">uom=</span><span class="s">&quot;urn:ogc:def:uom:EPSG::9105&quot;</span><span class="nt">&gt;</span>21<span class="nt">&lt;/gml:value&gt;</span> <span class="nt">&lt;gml:operationParameter</span> <span class="na">xlink:href=</span><span class="s">&quot;urn:ogc:def:parameter:EPSG::8813&quot;</span> <span class="nt">/&gt;</span> <span class="nt">&lt;/gml:ParameterValue&gt;</span> <span class="nt">&lt;/gml:parameterValue&gt;</span> <span class="nt">&lt;gml:parameterValue&gt;</span> <span class="nt">&lt;gml:ParameterValue&gt;</span> <span class="nt">&lt;gml:value</span> <span class="na">uom=</span><span class="s">&quot;urn:ogc:def:uom:EPSG::9105&quot;</span><span class="nt">&gt;</span>21<span class="nt">&lt;/gml:value&gt;</span> <span class="nt">&lt;gml:operationParameter</span> <span class="na">xlink:href=</span><span class="s">&quot;urn:ogc:def:parameter:EPSG::8814&quot;</span> <span class="nt">/&gt;</span> <span class="nt">&lt;/gml:ParameterValue&gt;</span> <span class="nt">&lt;/gml:parameterValue&gt;</span> <span class="nt">&lt;gml:parameterValue&gt;</span> <span class="nt">&lt;gml:ParameterValue&gt;</span> <span class="nt">&lt;gml:value</span> <span class="na">uom=</span><span class="s">&quot;urn:ogc:def:uom:EPSG::9201&quot;</span><span class="nt">&gt;</span>0.9995<span class="nt">&lt;/gml:value&gt;</span> <span class="nt">&lt;gml:operationParameter</span> <span class="na">xlink:href=</span><span class="s">&quot;urn:ogc:def:parameter:EPSG::8815&quot;</span> <span class="nt">/&gt;</span> <span class="nt">&lt;/gml:ParameterValue&gt;</span> <span class="nt">&lt;/gml:parameterValue&gt;</span> <span class="nt">&lt;gml:parameterValue&gt;</span> <span class="nt">&lt;gml:ParameterValue&gt;</span> <span class="nt">&lt;gml:value</span> <span class="na">uom=</span><span class="s">&quot;urn:ogc:def:uom:EPSG::9001&quot;</span><span class="nt">&gt;</span>400000<span class="nt">&lt;/gml:value&gt;</span> <span class="nt">&lt;gml:operationParameter</span> <span class="na">xlink:href=</span><span class="s">&quot;urn:ogc:def:parameter:EPSG::8816&quot;</span> <span class="nt">/&gt;</span> <span class="nt">&lt;/gml:ParameterValue&gt;</span> <span class="nt">&lt;/gml:parameterValue&gt;</span> <span class="nt">&lt;gml:parameterValue&gt;</span> <span class="nt">&lt;gml:ParameterValue&gt;</span> <span class="nt">&lt;gml:value</span> <span class="na">uom=</span><span class="s">&quot;urn:ogc:def:uom:EPSG::9001&quot;</span><span class="nt">&gt;</span>800000<span class="nt">&lt;/gml:value&gt;</span> <span class="nt">&lt;gml:operationParameter</span> <span class="na">xlink:href=</span><span class="s">&quot;urn:ogc:def:parameter:EPSG::8817&quot;</span> <span class="nt">/&gt;</span> <span class="nt">&lt;/gml:ParameterValue&gt;</span> <span class="nt">&lt;/gml:parameterValue&gt;</span> <span class="nt">&lt;/gml:Conversion&gt;</span> </pre></div> 
<?xml version="1.0" encoding="UTF-8"?>
 <gml:Conversion 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="epsg-op-19911">
   <gml:metaDataProperty>
      <epsg:CommonMetaData>
         <epsg:type>conversion</epsg:type>
         <epsg:alias alias="Laborde Grid" code="3481" codeSpace="urn:ogc:def:naming-system:EPSG::7301" />
         <epsg:informationSource>OGP</epsg:informationSource>
         <epsg:revisionDate>2007-01-11</epsg:revisionDate>
         <epsg:changes>
            <epsg:changeID xlink:href="urn:ogc:def:change-request:EPSG::1997.613" />
            <epsg:changeID xlink:href="urn:ogc:def:change-request:EPSG::2003.020" />
            <epsg:changeID xlink:href="urn:ogc:def:change-request:EPSG::2006.960" />
         </epsg:changes>
         <epsg:show>true</epsg:show>
         <epsg:isDeprecated>false</epsg:isDeprecated>
      </epsg:CommonMetaData>
   </gml:metaDataProperty>
   <gml:identifier codeSpace="OGP">urn:ogc:def:coordinateOperation:EPSG::19911</gml:identifier>
   <gml:name>Laborde Grid approximation</gml:name>
   <gml:remarks>Longitude is referenced to the Paris meridian. The conversion method is a good approximation (better than 5cm) to original formula (see proj code 19861) within a few hundred km of origin, but farther away the approximation may be no better than 1m.</gml:remarks>
   <gml:domainOfValidity xlink:href="urn:ogc:def:area:EPSG::1149" />
   <gml:scope>Medium scale topographic mapping.</gml:scope>
   <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>0</gco:Decimal>
                  </gco:Record>
               </gmd:value>
            </gmd:DQ_QuantitativeResult>
         </gmd:result>
      </gmd:DQ_RelativeInternalPositionalAccuracy>
   </gml:coordinateOperationAccuracy>
   <gml:method xlink:href="urn:ogc:def:method:EPSG::9815" />
   <gml:parameterValue>
      <gml:ParameterValue>
         <gml:value uom="urn:ogc:def:uom:EPSG::9105">-21</gml:value>
         <gml:operationParameter xlink:href="urn:ogc:def:parameter:EPSG::8811" />
      </gml:ParameterValue>
   </gml:parameterValue>
   <gml:parameterValue>
      <gml:ParameterValue>
         <gml:value uom="urn:ogc:def:uom:EPSG::9105">49</gml:value>
         <gml:operationParameter xlink:href="urn:ogc:def:parameter:EPSG::8812" />
      </gml:ParameterValue>
   </gml:parameterValue>
   <gml:parameterValue>
      <gml:ParameterValue>
         <gml:value uom="urn:ogc:def:uom:EPSG::9105">21</gml:value>
         <gml:operationParameter xlink:href="urn:ogc:def:parameter:EPSG::8813" />
      </gml:ParameterValue>
   </gml:parameterValue>
   <gml:parameterValue>
      <gml:ParameterValue>
         <gml:value uom="urn:ogc:def:uom:EPSG::9105">21</gml:value>
         <gml:operationParameter xlink:href="urn:ogc:def:parameter:EPSG::8814" />
      </gml:ParameterValue>
   </gml:parameterValue>
   <gml:parameterValue>
      <gml:ParameterValue>
         <gml:value uom="urn:ogc:def:uom:EPSG::9201">0.9995</gml:value>
         <gml:operationParameter xlink:href="urn:ogc:def:parameter:EPSG::8815" />
      </gml:ParameterValue>
   </gml:parameterValue>
   <gml:parameterValue>
      <gml:ParameterValue>
         <gml:value uom="urn:ogc:def:uom:EPSG::9001">400000</gml:value>
         <gml:operationParameter xlink:href="urn:ogc:def:parameter:EPSG::8816" />
      </gml:ParameterValue>
   </gml:parameterValue>
   <gml:parameterValue>
      <gml:ParameterValue>
         <gml:value uom="urn:ogc:def:uom:EPSG::9001">800000</gml:value>
         <gml:operationParameter xlink:href="urn:ogc:def:parameter:EPSG::8817" />
      </gml:ParameterValue>
   </gml:parameterValue>
</gml:Conversion>