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XML and Geodesy: A SOPAC Perspective
Paul Jamason, Scripps Orbit and Permanent Array Center
IGS Analysis Center Conference, Miami, June 2008
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XML and Geodesy: A SOPAC Perspective
SOPAC Participants
Director: Yehuda BockGPS Analysts:
Peng FangLinette Prawirodirdjo
Programmers:Ruey-Juin ChangPaul JamasonIan MacLeodMelinda Squibb
System Administrator: George Wadsworth
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XML and Geodesy: A SOPAC Perspective
XML: An Overview
XML: eXtensible Markup Language
Framework for sharing structured data Hierarchical tree-like structure Extensible: users define their own elements and documents by
extending base types
Encode data via element names/attributes (self-describing format)
XML schemas Validation: reduce publication of errors
Translate XML documents (instances) to a variety of formats via stylesheets
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XML and Geodesy: A SOPAC Perspective
XML Example: siteOffsets.xml
<siteOffsets xsi:schemaLocation="http://sopac.ucsd.edu/geodesy http://sopac.ucsd.edu/ns/geodesy/1.0.2/reason/procInput/offsets/siteOffsets.xsd><offset>
<fourCharacterID>ldes</fourCharacterID> <geod:sopacSiteID>ldes0000</geod:sopacSiteID> <geod:date>1999-10-16T00:00:00</geod:date> <geod:cause>co-seismic</geod:cause> <comments>Hector Mine EQ</comments>
<offsetComponentMagnitude> <geod:directionalComponent>north</geod:directionalComponent> <geod:magnitude uom="mm">178.287</geod:magnitude> <geod:sigma uom="mm">2.361</geod:sigma> </offsetComponentMagnitude> -- SNIP -- </offset></siteOffsets>
http://garner.ucsd.edu/pub/gamit/setup/siteOffsets.xml
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XML and Geodesy: A SOPAC Perspective
XSD Example: siteOffsets.xsd<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://sopac.ucsd.edu/geodesy" xmlns:geod="http://sopac.ucsd.edu/geodesy" xmlns:gen="http://sopac.ucsd.edu/general" elementFormDefault="qualified" version="1.0.2" xml:lang="en"> <xsd:include schemaLocation="includes.xsd"/> <xsd:import namespace="http://sopac.ucsd.edu/general" schemaLocation="http://sopac.ucsd.edu/ns/general/1.0.0/descriptors/spatialDescriptors.xsd"/>--SNIP--<xsd:complexType name="offsetType"> <xsd:sequence minOccurs="1" maxOccurs="1"> <xsd:element name="fourCharacterID" type="geod:gpsSiteFourCharacterID" minOccurs="1" maxOccurs="1"/> <xsd:element name="date" type="geod:gpsDateType" minOccurs="1" maxOccurs="1"/> <xsd:element name="cause" type="geod:offsetCauseType" minOccurs="1" maxOccurs="1"/> <!-- 1 to 3 of north/east/up components here (and their mags, sigmas) --> <xsd:element name="offsetComponentMagnitude" type="geod:offsetComponentMagnitudeType" minOccurs="1" maxOccurs="3"/> </xsd:sequence> </xsd:complexType> <xsd:simpleType name="offsetCauseType"> <xsd:restriction base="xsd:string"> <xsd:enumeration value="co-seismic"/> <xsd:enumeration value="equipment change"/> <xsd:enumeration value="environmental change"/> <xsd:enumeration value="creep event"/> <xsd:enumeration value="monument disruption"/> <xsd:enumeration value="metadata correction"/> <xsd:enumeration value="processing software change"/> <xsd:enumeration value="unknown"/> </xsd:restriction></xsd:schema>
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XML and Geodesy: A SOPAC Perspective
XML: (Dis)Advantages
Advantages Set of standards for
representing data; speak a common data language
Validation reduces publication of errors
Field formatting Limit valid entries (e.g.,
receiver/antenna types) Existing software:
XML schema creation XML instance validation XSLT transformation
Disadvantages Size Speed (validation) Additional work Difficult to visually
interpret XML Schema creation
can be unpleasant Not for large data files
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XML and Geodesy: A SOPAC Perspective
XML and Geodesy: Relevant Standards
Open Geospatial Community (OGC): Geographic Markup Language (GML) http://www.opengeospatial.org/standards Observation Collections Filter Encoding
Dublin Core Metadata Initiative (DCMI) Document-related Classify dates/files/services/creators
Geodesy Standard? Define a set of xml schemas with core spatial,
temporal, nominal parameters, and extend them
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XML and Geodesy: A SOPAC Perspective
Geodesy XML Candidates
Metadata-orientedIGS site logsProcessing setup files
Processing software front-ends (e.g., GAMIT)Bluebooking - NGS geodetic data
submissionOrbitML (GMV) - spacecraft flight
parametersRINEX, SINEX headers
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XML and Geodesy: A SOPAC Perspective
XML: Supporting Software
XML parsers/transformation software available in variety of languagesJavaPerl - Xerces FORTRAN - xmlf90; xmlfortran
XML schema generation software oxygenML for Eclipse
Java class generation XMLBeans
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XML and Geodesy: A SOPAC Perspective
XML and Geodesy at SOPAC: IGS Site Logs
Overview: http://sopac.ucsd.edu/projects/xml
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Sample XML IGS Site Log
<igsSiteLog xmlns="http://sopac.ucsd.edu/ns/geodesy/doc/igsSiteLog/2004" xmlns:mi="http://sopac.ucsd.edu/ns/geodesy/doc/igsSiteLog/monumentInfo/2004" xmlns:equip="http://sopac.ucsd.edu/ns/geodesy/doc/igsSiteLog/equipment/2004" xsi:schemaLocation="http://sopac.ucsd.edu/ns/geodesy/doc/igsSiteLog/2004 http://sopac.ucsd.edu/ns/geodesy/doc/igsSiteLog/2004/igsSiteLog.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<siteIdentification> <mi:siteName>Scripps 5 - Mt. Soledad</mi:siteName> <mi:fourCharacterID>SIO5</mi:fourCharacterID> <mi:iersDOMESNumber>40460M006</mi:iersDOMESNumber> </siteIdentification>
<siteLocation> <mi:city>La Jolla</mi:city> <mi:state>California</mi:state> <mi:country>USA</mi:country> <mi:approximatePositionITRF> <mi:xCoordinateInMeters>-2456115.13</mi:xCoordinateInMeters> <mi:yCoordinateInMeters>-4768905.79</mi:yCoordinateInMeters> <mi:zCoordinateInMeters>3439232.44</mi:zCoordinateInMeters> <mi:latitude-North>+325024.00</mi:latitude-North> <mi:longitude-East>-1171500.00</mi:longitude-East> <mi:elevation-m_ellips.>185.53</mi:elevation-m_ellips.> </mi:approximatePositionITRF> </siteLocation>
<gnssReceiver> <equip:receiverType>ASHTECH Z-XII3</equip:receiverType> <equip:satelliteSystem>GPS</equip:satelliteSystem> <equip:serialNumber>LP02814</equip:serialNumber> <equip:firmwareVersion>CD00</equip:firmwareVersion> <equip:dateInstalled>2002-05-15T00:00Z</equip:dateInstalled> <equip:dateRemoved>2003-01-09T00:00Z</equip:dateRemoved> </gnssReceiver>
<gnssAntenna> <equip:antennaType>ASH701945B_M</equip:antennaType> <equip:serialNumber>CR519991867</equip:serialNumber> <equip:antennaReferencePoint>BPA</equip:antennaReferencePoint> <equip:marker-arpUpEcc.>0.0083</equip:marker-arpUpEcc.> <equip:dateInstalled>2002-05-15T00:00Z</equip:dateInstalled> <equip:dateRemoved>2004-09-29T00:00Z</equip:dateRemoved> <equip:notes></equip:notes> </gnssAntenna>
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XML and Geodesy: A SOPAC Perspective
XML and Geodesy at SOPAC
Time Series PlottingGPS analysis input
Historical equipment informationSite motion model terms - apriori coordsPhase center information
GPS coordinate data submission/queryingGML Observation CollectionsGML Filter Encoding
GPS time series offsets
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XML and Geodesy: A SOPAC Perspective
XML and Geodesy: Conclusion
SOPAC: support IGS/INDIGO via XML site log implementation
Widely used in other fields
Encapsulate, control, validate metadata
Appeal to IT staffs