GeoSciML Implementation by Agns TellezArenas

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GeoSciMLImplementationby Agnès
Tellez-Arenas
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How implement GeoSciML by a Web Service?

• First step data mapping
• preparation of the services WMS,WFS
• Data Specification (the attributes delivered).
• Vocabularies (content of the attributes)
• Second step schema transformation
• GML gt GeoSciML WMS.getFeatureInfo,
  WFS.getFeature
• GeoSciML gt GML
• WMS.getMap using GeoSciML expressed SLD
• WFS.getFeature using queries

For client applications, what utilisation of
GeoSciML?
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• What a GeoSciML Web Map/Feature Service is?
• It is a service delivering features
• The features are expressed in several formats
• In Image (getMap request)
• In text or HTML (getFeatureInfo)
• In XML (getFeatureInfo, getFeature). In that
  case, the XML delivered is GeoSciML (instead of
  usual GML).

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• What a GeoSciML Web Map/Feature Service is?
• It is a service delivering features
• The Data Model of these features is a schema (a
  structure) who respects GeoSciML
• Content of the data (numerical, free text, of urn
  referencing GeoSciML concepts)
• Organization of the data (names of the fields and
  structure).

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• Example of key attribute/value expressed in
  GeoSciML
• For example, lithology is a field named (i.e.
  the path)
• gsmlcomposition/gsmlCompositionPart/gsmllit
  hology_at_xlinkhref  
• Which the GeoSciML value is
• urncgiclassifierCGISimpleLitho
  logy2008sand
• Instead of the GML name brgm_litho_multiple
   
• Which the value is sable dOrléans
• The GML name (and value) is specific to a
  dataset.
• The GeoSciML name (and value) is generic,
  harmonized, standard.

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• What are the steps for implementing a GeoSciML
  service?
• First Step Data Mapping
• Create a new dataset, copying the starting
  from dataset
• A new table in a database, or a new shapefile
• Add one column by GeoSciML attribute
• Depending on the Data Model
• From columns of the starting from dataset,
  deduce the textual (or numerical) values of the
  GeoSciML attributes.
• This step should require the participation of
  an IT person and a
• data content expert (geoscientist).

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• What are the steps for implementing GeoSciML
  service?
• First Step Data Mapping
• Some attributes (depend on the Data Model) must
  have values took inside a GeoSciML vocabulary.
• These values are Controlled Concepts identified
  by URN (Unified Resource Name).
• A GeoScientist expert must decide, for each
  possible value (textual value in the starting
  from column), which GeoSciML Controlled Concept
  corresponds.
• The GeoSciML Controlled Concepts are organized in
  trees (hierarchy), therefore the GeoScientist can
  simplify the local data if it doesnt exist in
  the GeoSciML vocabulary.
• The aim is to provide a WMS / WFS delivering
  usual GML with attributes and values following
  the Data Specification.

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• What are the steps for implementing GeoSciML
  service?
• First Step Data Mapping
• Example
• In a GeoSciML Data Model, we decide to store the
  lithology as up to five fields (to express
  multiple lithology).
• The objective is to produce a dataset with the
  following attributes
• urn_litho_1, urn_litho_2, urn_litho_3,
  urn_litho_4, urn_litho_5
• Which each value is took from the official the
  GeoSciML vocabulary urncgiclassifierScheme
  CGISimpleLithology200811.xml
• In the starting from national dataset,
  lithology is stored inside a unique field named
  brgm_litho_multiple, which values are free
  texts
• sables, argiles, graviers, galets

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• What are the steps for implementing GeoSciML
  service?
• First Step Data Mapping
• Example
• Starting from a unique field which value is
  sables, argiles, graviers
• the Objective is to obtain
• urn_litho_1urncgiclassifierSchemeCGISimpleL
  ithology200811sand
• urn_litho_2urncgiclassifierCGISimpleLitholog
  y2008non_clastic_siliceous_sedimentary_rock
• urn_litho_3 urncgiclassifierSchemeCGISimpleL
  ithology200811rock
• urn_litho_4
• urn_litho_5
• The GeoSciML path of each lithology field is
• gsmlcomposition/gsmlCompositionPart/gsmllitholo
  gy_at_xlinkhref
• The GeoSciML vocabularies are available here
• http//appgeosciml.brgm.fr/GeoSciMLWeb/middleware.
  jsp

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• What are the steps for implementing GeoSciML
  service?
• First Step Data Mapping
• Example
• http//onegeology-europe.brgm.fr/demoServices/in
  dex.jsp

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• Second Step Implement the GeoSciML schema
• Starting from the Data Specification implemented
  in step 1
• ltmsGMLOutputgt
• ltonege_wms_layergt
• ltonege_wms_featuregt
• ltgmlboundedBygt
• ltgmlBox srsName"EPSG27582"gt
• ltgmlcoordinatesgt22763.700000,1602697.400000
  1215763.800000,2682702.500000lt/gmlcoordinatesgt
• lt/gmlBoxgt
• lt/gmlboundedBygt
• ltgidgt17722lt/gidgt
• lturn_stratigturncgiclassifierICSStratChart2
  008Holocenelt/urn_stratigt
• ltdescription_textgtLithologie sables, argiles,
  graviers, galetslt/description_textgt
• lturn_litho_1gturncgiclassifierCGISimpleLitho
  logy2008sandlt/urn_litho_1gt
• lturn_litho_2gt
• urncgiclassifierCGISimpleLithology2008non_cl
  astic_siliceous_sedimentary_rock
• lt/urn_litho_2gt
• lt/onege_wms_featuregt

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• Second Step Implement the GeoSciML schema
• The objective is to generate the GeoSciML schema
  

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• Second Step Implement the GeoSciML schema
• Example
• http//onegeology-europe.brgm.fr/demoServices/in
  dex.jsp
• There does not exist any WMS or WFS software
  implementing GeoSciML.
• It is necessary to add a component front of the
  WMS/WFS to handle/generate GeoSciML.

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• What a GeoSciML Web Map/Feature Service is?
• WMS (View service)
• Metadata (GetCapabilities) Usual WMS
  GetCapabilities
• View (GetMap)
• If using external SLD, for example user-defined
  SLD for query and view applications, or using
  harmonized external SLD SLD is expressed with
  GeoSciML path (instead of GML path).
• Get the Data (GetFeatureInfo) if requested in
  XML, should be delivered in GeoSciML.
• WFS (Query and use/download service)
• Metadata (GetCapabilities) Usual WFS
  GetCapabilities
• Get the Data (GetFeature) if requested in XML,
  should be delivered in GeoSciML.
• If using query (filter), the query is expressed
  with GeoSciML path (instead of GML path).

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• What are the steps for implementing GeoSciML
  service?
• Second Step Implement the GeoSciML schema
• WMS (View service)
• Metadata (GetCapabilities) Usual WMS
  GetCapabilities
• In the GetCapabilities, the outputFormat for the
  GetFeatureInfo must include text/xml.
• Nothing else.

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• What are the steps for implementing GeoSciML
  service?
• Second Step Implement the GeoSciML schema
• WMS (View service)
• View (GetMap)
• If using external SLD, for example user-defined
  SLD for query and view applications, or using
  harmonized external SLD
• SLD is expressed with GeoSciML path (instead of
  GML path).
• Example http//onegeology-europe.brgm.fr/demoServ
  ices/index.jsp
• The GeoSciML Component must
• Handle an external SLD
• Transform the SLD with GeoSciML path into a SLD
  expressed using local paths

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• GeoSciML SLD Example
• GML OGC filter used in the SLD to query and view
  the dataset
• ltogcFiltergt
• ltogcPropertyIsEqualTogt
  ltogcPropertyNamegturn_litho_1lt/ogcPropertyNamegt
  ltogcLiteralgturncgiclassifierCGISimpleLitholog
  y2008sandlt/ogcLiteralgt lt/ogcPropertyIsEqualTogt
  lt/ogcFiltergt
• The same OGC filter expressed in GeoSciML
• ltogcFiltergt ltogcPropertyIsEqualTogt
  ltogcPropertyNamegtgsmlcomposition/gsmlCompositio
  nPart/gsmllithology_at_xlinkhreflt/ogcPropertyNamegt
  ltogcLiteralgturncgiclassifierCGISimpleLitholo
  gy2008sandlt/ogcLiteralgt lt/ogcPropertyIsEqualTo
  gt lt/ogcFiltergt

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• What are the steps for implementing GeoSciML
  service?
• Second Step Implement the GeoSciML schema
• WMS (View service)
• Get the Data (GetFeatureInfo) if requested in
  XML, should be delivered in GeoSciML.
• Example http//onegeology-europe.brgm.fr/demoServ
  ices/index.jsp
• The GeoSciML Component must
• Read the GML generated by the OGC WMS server
• Transform it into GeoSciML

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• What are the steps for implementing GeoSciML
  service?
• Second Step Implement the GeoSciML schema
• WFS (Query and use/download service)
• Metadata (GetCapabilities) Usual WFS
  GetCapabilities
• In the GetCapabilities, the outputFormat for the
  GetFeature must include text/xml
  subtypegeosciml/2.0.
• Nothing else.

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• What are the steps for implementing GeoSciML
  service?
• Second Step Implement the GeoSciML schema
• WFS (Query and use/download service)
• Get the Data (GetFeature) if requested in XML,
  should be delivered in GeoSciML.
• If using query (filter), the query is expressed
  with GeoSciML path (instead of GML path).
• The GeoSciML Component must
• Handle the query expressed in GeoSciML
• Transform it (replacing GeoSciML path by local
  path)
• Transfert the query to the OGC WFS server, then
  read the GML generated
• Transform it into GeoSciML

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• For client applications, what utilisation of
  GeoSciML?
• Example of OneGeology-Europe project

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• For client applications, what utilisation of
  GeoSciML?
• Interesting functionalities on such harmonized
  datasets
• Query and view
• Using external SLD and getMap requests to query
  datasets
• Query and print / download
• Using query and WFS to query then print or
  download the features
• Multilingualism
• Data content the getFeatureInfo or GetFeature
  response is expressed in GeoSciML. Using GeoSciML
  vocabularies (where each Concept is translated),
  the terms used can be translated by the client
  application.
• Legend in the case of a legend based on a SLD
  known by the client application, this application
  is able to display a legend translated (same
  process as translation of GetFeatureInfo or
  GetFeature).

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• Conclusion
• GeoSciML WFS, with some filters allowed in the
  query
• Already implemented in GeoSciML testbed
• GeoSciML WFS,
• already implemented by several OneGeology Global
  WFS
• To be implemented and used into OneGeology Europe
  project