XML and Geodesy: A SOPAC Perspective
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Transcript of XML and Geodesy: A SOPAC Perspective
XML and Geodesy: A SOPAC Perspective
Paul Jamason, Scripps Orbit and Permanent Array Center
IGS Analysis Center Conference, Miami, June 2008
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
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
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
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>
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
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
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
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
XML and Geodesy: A SOPAC Perspective
XML and Geodesy at SOPAC: IGS Site Logs
Overview: http://sopac.ucsd.edu/projects/xml
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>
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
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