<?xml version="1.0" encoding="UTF-8"?>
<!-- 
License: CC By 4.0 (https://creativecommons.org/licenses/by/4.0/)
Copyright: Royal Observatory of Belgium (please acknowledge us and/or cite doi:10.24414/ROB-GNSS-M3G)
-->
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  <geo:siteLog gml:id="epen00nld_20260116">
    <geo:formInformation>
      <geo:FormInformation gml:id="form-info">
        <geo:preparedBy>TU Delft GNSS team (gnss-citg@tudelft.nl)</geo:preparedBy>
        <geo:datePrepared>2026-01-16</geo:datePrepared>
        <geo:reportType>UPDATE</geo:reportType>
      </geo:FormInformation>
    </geo:formInformation>
    <geo:siteIdentification>
      <geo:SiteIdentification gml:id="site-identification">
        <geo:siteName>Epen IGRS</geo:siteName>
        <geo:fourCharacterID>EPEN</geo:fourCharacterID>
        <geo:monumentNumber>0</geo:monumentNumber>
        <geo:receiverNumber>0</geo:receiverNumber>
        <geo:monumentInscription>TOP OF IGRS MAST</geo:monumentInscription>
        <geo:iersDOMESNumber>13545M001</geo:iersDOMESNumber>
        <geo:cdpNumber></geo:cdpNumber>
        <geo:monumentDescription codeSpace="urn:ga-gov-au:monument-description-type"><![CDATA[INTEGRATED GEODETIC REFERENCE STATION]]></geo:monumentDescription>
        <geo:heightOfTheMonument>2.70</geo:heightOfTheMonument>
        <geo:monumentFoundation>CONRCRETE BUNKER</geo:monumentFoundation>
        <geo:foundationDepth>8</geo:foundationDepth>
        <geo:markerDescription>SECO MOUNT</geo:markerDescription>
        <geo:dateInstalled>2022-06-21T12:00:00Z</geo:dateInstalled>
        <geo:geologicCharacteristic codeSpace="urn:ga-gov-au:geologic-characteristic-type"><![CDATA[BEDROCK]]></geo:geologicCharacteristic>
        <geo:bedrockType>METAMORPHIC</geo:bedrockType>
        <geo:bedrockCondition>FRESH</geo:bedrockCondition>
        <geo:fractureSpacing>0</geo:fractureSpacing>
        <geo:faultZonesNearby codeSpace="urn:ga-gov-au:fault-zones-type"><![CDATA[NO]]></geo:faultZonesNearby>
        <geo:distance-Activity></geo:distance-Activity>
        <geo:notes><![CDATA[Concrete bunker with seismic station (KNMI) and absolute gravity point is founded on Carboon Bedrock]]></geo:notes>
      </geo:SiteIdentification>
    </geo:siteIdentification>
    <geo:siteLocation>
      <geo:SiteLocation gml:id="site-location">
        <geo:city>Epen</geo:city>
        <geo:state>Limburg</geo:state>
        <geo:countryCodeISO codeSpace="urn:gnss-metadata.eu:country-code" codeList="https://gnss-metadata.eu/geodesyml/codelists/country-codes-codelist.xml#GeodesyML_CountryCode" codeListValue="NLD"><![CDATA[NLD]]></geo:countryCodeISO>
        <geo:tectonicPlate codeSpace="urn:ga-gov-au:plate-type"><![CDATA[EURASIAN]]></geo:tectonicPlate>
        <geo:approximatePositionITRF>
          <geo:cartesianPosition>
            <gml:Point gml:id="pos_cartesian">
              <gml:pos srsName="EPSG:4978"><![CDATA[4020949.971 417728.8057 4917062.383]]></gml:pos>
            </gml:Point>
          </geo:cartesianPosition>
          <geo:geodeticPosition>
            <gml:Point gml:id="pos_ellipsoidal">
              <gml:pos srsName="EPSG:4979"><![CDATA[50.763139973559 5.9310725700981 183.93711457215]]></gml:pos>
            </gml:Point>
          </geo:geodeticPosition>
        </geo:approximatePositionITRF>
        <geo:notes></geo:notes>
      </geo:SiteLocation>
    </geo:siteLocation>
    <geo:gnssReceiver>
      <geo:GnssReceiver gml:id="gnss-receiver-643d1b851bdbd">
        <geo:notes></geo:notes>
        <geo:manufacturerSerialNumber>3080070</geo:manufacturerSerialNumber>
        <geo:igsModelCode codeSpace="urn:gnss-metadata.eu:receiver-type" codeList="https://gnss-metadata.eu/geodesyml/codelists/antenna-receiver-codelists.xml#GeodesyML_GNSSReceiverTypeCode" codeListValue="SEPT POLARX5"><![CDATA[SEPT POLARX5]]></geo:igsModelCode>
        <geo:satelliteSystem><![CDATA[GPS]]></geo:satelliteSystem>
        <geo:satelliteSystem><![CDATA[GLO]]></geo:satelliteSystem>
        <geo:satelliteSystem><![CDATA[GAL]]></geo:satelliteSystem>
        <geo:satelliteSystem><![CDATA[BDS]]></geo:satelliteSystem>
        <geo:satelliteSystem><![CDATA[QZSS]]></geo:satelliteSystem>
        <geo:satelliteSystem><![CDATA[SBAS]]></geo:satelliteSystem>
        <geo:firmwareVersion><![CDATA[5.4.0]]></geo:firmwareVersion>
        <geo:elevationCutoffSetting xsi:nil="false">0.0</geo:elevationCutoffSetting>
        <geo:dateInstalled><![CDATA[2022-06-24T00:00:00Z]]></geo:dateInstalled>
        <geo:dateRemoved><![CDATA[2023-04-17T06:56:00Z]]></geo:dateRemoved>
        <geo:temperatureStabilization xsi:nil="false">0.0</geo:temperatureStabilization>
      </geo:GnssReceiver>
      <geo:dateInserted>2023-04-17T10:12:00Z</geo:dateInserted>
      <geo:dateDeleted></geo:dateDeleted>
    </geo:gnssReceiver>
    <geo:gnssReceiver>
      <geo:GnssReceiver gml:id="gnss-receiver-643d1b851be04">
        <geo:notes></geo:notes>
        <geo:manufacturerSerialNumber>3080070</geo:manufacturerSerialNumber>
        <geo:igsModelCode codeSpace="urn:gnss-metadata.eu:receiver-type" codeList="https://gnss-metadata.eu/geodesyml/codelists/antenna-receiver-codelists.xml#GeodesyML_GNSSReceiverTypeCode" codeListValue="SEPT POLARX5"><![CDATA[SEPT POLARX5]]></geo:igsModelCode>
        <geo:satelliteSystem><![CDATA[GPS]]></geo:satelliteSystem>
        <geo:satelliteSystem><![CDATA[GLO]]></geo:satelliteSystem>
        <geo:satelliteSystem><![CDATA[GAL]]></geo:satelliteSystem>
        <geo:satelliteSystem><![CDATA[BDS]]></geo:satelliteSystem>
        <geo:satelliteSystem><![CDATA[QZSS]]></geo:satelliteSystem>
        <geo:satelliteSystem><![CDATA[SBAS]]></geo:satelliteSystem>
        <geo:firmwareVersion><![CDATA[5.5.0]]></geo:firmwareVersion>
        <geo:elevationCutoffSetting xsi:nil="false">0.0</geo:elevationCutoffSetting>
        <geo:dateInstalled><![CDATA[2023-04-17T06:56:00Z]]></geo:dateInstalled>
        <geo:dateRemoved><![CDATA[]]></geo:dateRemoved>
        <geo:temperatureStabilization xsi:nil="false">0.0</geo:temperatureStabilization>
      </geo:GnssReceiver>
      <geo:dateInserted>2023-04-17T10:12:00Z</geo:dateInserted>
      <geo:dateDeleted></geo:dateDeleted>
    </geo:gnssReceiver>
    <geo:gnssAntenna>
      <geo:GnssAntenna gml:id="gnss-antenna-643d192b9c122">
        <geo:notes></geo:notes>
        <geo:manufacturerSerialNumber>5887</geo:manufacturerSerialNumber>
        <geo:igsModelCode codeSpace="urn:gnss-metadata.eu:antenna-type" codeList="https://gnss-metadata.eu/geodesyml/codelists/antenna-receiver-codelists.xml#GeodesyML_GNSSAntennaTypeCode" codeListValue="SEPCHOKE_B3E6   SPKE"><![CDATA[SEPCHOKE_B3E6   SPKE]]></geo:igsModelCode>
        <geo:antennaReferencePoint codeSpace="urn:ga-gov-au:antenna-reference-point-type"><![CDATA[BPA]]></geo:antennaReferencePoint>
        <geo:marker-arpUpEcc.>0.0</geo:marker-arpUpEcc.>
        <geo:marker-arpNorthEcc.>0.0</geo:marker-arpNorthEcc.>
        <geo:marker-arpEastEcc.>0.0</geo:marker-arpEastEcc.>
        <geo:alignmentFromTrueNorth xsi:nil="false">0.0</geo:alignmentFromTrueNorth>
        <geo:antennaRadomeType codeSpace="urn:igs-org:gnss-radome-model-code"><![CDATA[SPKE]]></geo:antennaRadomeType>
        <geo:radomeSerialNumber><![CDATA[]]></geo:radomeSerialNumber>
        <geo:antennaCableType><![CDATA[]]></geo:antennaCableType>
        <geo:antennaCableLength xsi:nil="true"/>
        <geo:dateInstalled><![CDATA[2022-06-24T00:00:00Z]]></geo:dateInstalled>
        <geo:dateRemoved><![CDATA[]]></geo:dateRemoved>
      </geo:GnssAntenna>
      <geo:dateInserted>2023-04-17</geo:dateInserted>
      <geo:dateDeleted></geo:dateDeleted>
    </geo:gnssAntenna>
    <geo:frequencyStandard>
      <geo:FrequencyStandard gml:id="frequency-643d192b9ef08">
        <geo:standardType codeSpace="urn:ga-gov-au:frequency-standard-type"><![CDATA[INTERNAL ]]></geo:standardType>
        <gml:validTime>
          <gml:TimePeriod gml:id="frequency-643d192b9ef08-time">
            <gml:beginPosition><![CDATA[2022-06-24]]></gml:beginPosition>
            <gml:endPosition><![CDATA[]]></gml:endPosition>
          </gml:TimePeriod>
        </gml:validTime>
        <geo:notes><![CDATA[]]></geo:notes>
      </geo:FrequencyStandard>
      <geo:dateInserted>2023-04-17</geo:dateInserted>
      <geo:dateDeleted></geo:dateDeleted>
    </geo:frequencyStandard>
    <geo:collocationInformation>
      <geo:CollocationInformation gml:id="coll-696a199cafa4f">
        <geo:instrumentationType codeSpace="urn:ga-gov-au:instrumentation-type"><![CDATA[SEISMOMETER]]></geo:instrumentationType>
        <geo:status codeSpace="urn:ga-gov-au:status-type"><![CDATA[PERMANENT]]></geo:status>
        <gml:validTime>
          <gml:TimePeriod gml:id="coll-696a199cafa4f-time">
            <gml:beginPosition><![CDATA[2001-06-06]]></gml:beginPosition>
            <gml:endPosition><![CDATA[]]></gml:endPosition>
          </gml:TimePeriod>
        </gml:validTime>
        <geo:notes><![CDATA[KNMI station Heimansgroeve (HGN), broadband, Streckeisen: STS-1 VBB]]></geo:notes>
      </geo:CollocationInformation>
      <geo:dateInserted>2026-01-16T10:57:00Z</geo:dateInserted>
      <geo:dateDeleted></geo:dateDeleted>
    </geo:collocationInformation>
    <geo:collocationInformation>
      <geo:CollocationInformation gml:id="coll-696a16eea9ed9">
        <geo:instrumentationType codeSpace="urn:ga-gov-au:instrumentation-type"><![CDATA[ABSOLUTE GRAVIMETER]]></geo:instrumentationType>
        <geo:status codeSpace="urn:ga-gov-au:status-type"><![CDATA[MOBILE]]></geo:status>
        <gml:validTime>
          <gml:TimePeriod gml:id="coll-696a16eea9ed9-time">
            <gml:beginPosition><![CDATA[2010-01-01]]></gml:beginPosition>
            <gml:endPosition><![CDATA[]]></gml:endPosition>
          </gml:TimePeriod>
        </gml:validTime>
        <geo:notes><![CDATA[FG-5 absolute gravimeter, yearly campaign measurement (start date TBC)]]></geo:notes>
      </geo:CollocationInformation>
      <geo:dateInserted>2026-01-16T10:46:00Z</geo:dateInserted>
      <geo:dateDeleted></geo:dateDeleted>
    </geo:collocationInformation>
    <geo:collocationInformation>
      <geo:CollocationInformation gml:id="coll-696a19dbb7c77">
        <geo:instrumentationType codeSpace="urn:ga-gov-au:instrumentation-type"><![CDATA[INSAR CR/I]]></geo:instrumentationType>
        <geo:status codeSpace="urn:ga-gov-au:status-type"><![CDATA[PERMANENT]]></geo:status>
        <gml:validTime>
          <gml:TimePeriod gml:id="coll-696a19dbb7c77-time">
            <gml:beginPosition><![CDATA[2022-06-24]]></gml:beginPosition>
            <gml:endPosition><![CDATA[]]></gml:endPosition>
          </gml:TimePeriod>
        </gml:validTime>
        <geo:notes><![CDATA[Integrated Geodetic Reference Station (IGRS)
with  mechanically coupled GNSS antenna, double
backflip corner reflectors for ascending and
descending (In)SAR acquisitions, and reflective
surface for Laser Altimetry.]]></geo:notes>
      </geo:CollocationInformation>
      <geo:dateInserted>2026-01-16T10:58:00Z</geo:dateInserted>
      <geo:dateDeleted></geo:dateDeleted>
    </geo:collocationInformation>
    <geo:siteOwner gml:id="siteOwner">
      <gml:identifier codeSpace="https://gnss-metadata.eu/"><![CDATA[https://ror.org/02e2c7k09]]></gml:identifier>
      <gml:name><![CDATA[DUT]]></gml:name>
      <gmd:MD_SecurityConstraints>
        <gmd:classification gco:nilReason="Missing"/>
      </gmd:MD_SecurityConstraints>
      <gmd:CI_ResponsibleParty>
        <gmd:individualName>
          <gco:CharacterString><![CDATA[TU Delft GNSS team]]></gco:CharacterString>
        </gmd:individualName>
        <gmd:organisationName>
          <gco:CharacterString><![CDATA[Delft University of Technology]]></gco:CharacterString>
        </gmd:organisationName>
        <gmd:positionName>
          <gco:CharacterString><![CDATA[Department of Geoscience and Remote Sensing (GRS)]]></gco:CharacterString>
        </gmd:positionName>
        <gmd:contactInfo>
          <gmd:CI_Contact>
            <gmd:phone>
              <gmd:CI_Telephone>
                <gmd:voice>
                  <gco:CharacterString><![CDATA[+31 15 2784907]]></gco:CharacterString>
                </gmd:voice>
              </gmd:CI_Telephone>
            </gmd:phone>
            <gmd:address>
              <gmd:CI_Address>
                <gmd:deliveryPoint>
                  <gco:CharacterString><![CDATA[Stevinweg, 1]]></gco:CharacterString>
                </gmd:deliveryPoint>
                <gmd:city>
                  <gco:CharacterString><![CDATA[Delft]]></gco:CharacterString>
                </gmd:city>
                <gmd:administrativeArea>
                  <gco:CharacterString><![CDATA[Department of Geoscience and Remote Sensing (GRS)]]></gco:CharacterString>
                </gmd:administrativeArea>
                <gmd:postalCode>
                  <gco:CharacterString><![CDATA[2628 CN]]></gco:CharacterString>
                </gmd:postalCode>
                <gmd:country>
                  <gco:CharacterString><![CDATA[Netherlands (the)]]></gco:CharacterString>
                </gmd:country>
                <gmd:electronicMailAddress>
                  <gco:CharacterString><![CDATA[gnss-citg@tudelft.nl]]></gco:CharacterString>
                </gmd:electronicMailAddress>
              </gmd:CI_Address>
            </gmd:address>
          </gmd:CI_Contact>
        </gmd:contactInfo>
        <gmd:role/>
      </gmd:CI_ResponsibleParty>
    </geo:siteOwner>
    <geo:siteMetadataCustodian gml:id="metadataCustodian">
      <gml:identifier codeSpace="https://gnss-metadata.eu/"><![CDATA[https://ror.org/02e2c7k09]]></gml:identifier>
      <gml:name><![CDATA[DUT]]></gml:name>
      <gmd:MD_SecurityConstraints>
        <gmd:classification gco:nilReason="Missing"/>
      </gmd:MD_SecurityConstraints>
      <gmd:CI_ResponsibleParty>
        <gmd:individualName>
          <gco:CharacterString><![CDATA[TU Delft GNSS team]]></gco:CharacterString>
        </gmd:individualName>
        <gmd:organisationName>
          <gco:CharacterString><![CDATA[Delft University of Technology]]></gco:CharacterString>
        </gmd:organisationName>
        <gmd:positionName>
          <gco:CharacterString><![CDATA[Department of Geoscience and Remote Sensing (GRS)]]></gco:CharacterString>
        </gmd:positionName>
        <gmd:contactInfo>
          <gmd:CI_Contact>
            <gmd:phone>
              <gmd:CI_Telephone>
                <gmd:voice>
                  <gco:CharacterString><![CDATA[+31 15 2784907]]></gco:CharacterString>
                </gmd:voice>
              </gmd:CI_Telephone>
            </gmd:phone>
            <gmd:address>
              <gmd:CI_Address>
                <gmd:deliveryPoint>
                  <gco:CharacterString><![CDATA[Stevinweg, 1]]></gco:CharacterString>
                </gmd:deliveryPoint>
                <gmd:city>
                  <gco:CharacterString><![CDATA[Delft]]></gco:CharacterString>
                </gmd:city>
                <gmd:administrativeArea>
                  <gco:CharacterString><![CDATA[Department of Geoscience and Remote Sensing (GRS)]]></gco:CharacterString>
                </gmd:administrativeArea>
                <gmd:postalCode>
                  <gco:CharacterString><![CDATA[2628 CN]]></gco:CharacterString>
                </gmd:postalCode>
                <gmd:country>
                  <gco:CharacterString><![CDATA[Netherlands (the)]]></gco:CharacterString>
                </gmd:country>
                <gmd:electronicMailAddress>
                  <gco:CharacterString><![CDATA[gnss-citg@tudelft.nl]]></gco:CharacterString>
                </gmd:electronicMailAddress>
              </gmd:CI_Address>
            </gmd:address>
          </gmd:CI_Contact>
        </gmd:contactInfo>
        <gmd:role/>
      </gmd:CI_ResponsibleParty>
    </geo:siteMetadataCustodian>
    <geo:moreInformation>
      <geo:MoreInformation gml:id="more-info">
        <geo:dataCenter><![CDATA[DUT]]></geo:dataCenter>
        <geo:urlForMoreInformation><![CDATA[http://gnss1.tudelft.nl/dpga]]></geo:urlForMoreInformation>
        <geo:siteMap><![CDATA[]]></geo:siteMap>
        <geo:siteDiagram><![CDATA[]]></geo:siteDiagram>
        <geo:horizonMask><![CDATA[]]></geo:horizonMask>
        <geo:monumentDescription><![CDATA[]]></geo:monumentDescription>
        <geo:sitePictures><![CDATA[]]></geo:sitePictures>
        <geo:notes><![CDATA[]]></geo:notes>
        <geo:antennaGraphicsWithDimensions><![CDATA[SEPCHOKE_B3E6

                    ---------------                       <--  0.1550
                  /                 \
                 |                   |
+-----------------------------------------------------+   <--  0.1080  TCR
|                                                     |
|                                                     |
|                                                     |
|                                                     |
+-----------------+-----------------+-----------------+   <--  0.0480  BCR
                  |                 |
                  |                 |
                  |                 |
                  +--------x--------+                     <--  0.0000  BPA=ARP
                                                              (5/8" thread might
                                                               differ from BPA!)
                                                                       NOM=NRP
                  <--    0.1210   -->
<--                      0.3630                     -->]]></geo:antennaGraphicsWithDimensions>
        <geo:insertTextGraphicFromAntenna><![CDATA[SEPCHOKE_B3E6

                    ---------------                       <--  0.1550
                  /                 \
                 |                   |
+-----------------------------------------------------+   <--  0.1080  TCR
|                                                     |
|                                                     |
|                                                     |
|                                                     |
+-----------------+-----------------+-----------------+   <--  0.0480  BCR
                  |                 |
                  |                 |
                  |                 |
                  +--------x--------+                     <--  0.0000  BPA=ARP
                                                              (5/8" thread might
                                                               differ from BPA!)
                                                                       NOM=NRP
                  <--    0.1210   -->
<--                      0.3630                     -->]]></geo:insertTextGraphicFromAntenna>
        <geo:DOI codeSpace="urn:ga-gov-au:self.moreInformation-type"/>
      </geo:MoreInformation>
    </geo:moreInformation>
  </geo:siteLog>
</geo:GeodesyML>
