Index: European Space Agency HMA program

• European Space Agency HMA program
• Geonetwork opensource
• ebRIM & CSW profile
• GeoNetwork ebRIM
• GeoNetwork future architecture
• Questions

Heterogeneous Mission Accessibility - Interoperability project

• standardise the ground segment interfaces of satellite missions for easier access to Earth Observation (EO) data
• allow harmonised access to heterogeneous EO missions data from multiple providers, incl. national missions and ESA Sentinel missions

The HMA goals are linked to specific objectives (1/2):

• Manage and reduce technical risks in EO systems and operations
• Manage and reduce cost of EO systems and operations
• Establish baseline for development of European Space infrastructure
• Allow interoperability within and across organisations

The HMA goals are linked to specific objectives (2/2):

• Increase competitiveness of European Space (and downstream) industry
• Maintain leadership in EO systems and operations and avoid insurgence of undesired standards
• Ensure that technology drivers for European guaranteed access to Space are lead by European requirements

Index: Geonetwork opensource

• European Space Agency HMA program
• Geonetwork opensource
• ebRIM & CSW profile
• GeoNetwork ebRIM
• GeoNetwork future architecture
• Questions

Geospatial metadata catalog (1/2)

• Metadata geospatial catalogue software providing:
  • Advanced search discovery tool on local and distributed geospatial catalogues
  • Online editing of metadata
  • Harvesting from remote catalogs
  • Embedded geographic map viewer
• Based on Open Standards for services and protocols:
  • Metadata: ISO191115, ISO19139, FGDC, Dublin Core
  • Searching/Harvesting/Display: OGC CSW (Catalog Services for the Web), Z39.50, WMS, WFS protocols

Geospatial metadata catalog (2/2)

• Free and Open Source Software (FOSS)
  • Collaborative development of many contributors: FAO, UNOCHA, CSICGIAR, UNEP, ESA and many others.
  • Publicly accessible code repository at Sourceforge.net
• Statistics
  • User mailing list: 500 users, plus 60 in the French mailing list, plus 75 in the Spanish user list.
  • Developers mailing list: 275 users.
  • Commit mailing list: 40 users.
  • Average monthly downloads in 2008 > 1,000.
  • Over 2,000 downloads in September 2009.

Geonetwork opensource screenshot

Index: ebRIM & CSW profile

• European Space Agency HMA program
• Geonetwork opensource
• ebRIM & CSW profile
• GeoNetwork ebRIM
• GeoNetwork future architecture
• Questions

ebRIM: ebXML Registry Information

• ebXML Registry Information Model Version 3.0
• securely manage any content type and standardized metadata that describes it
• provide services that enable sharing of content and metadata between organizational entities in a federated environment

Registry and Repository

• ebXML Repository: store any type of electronic content (e.g. XML documents, text documents, images, sound and video)
• RepositoryItem: instance of stored content
• ebXML Registry: store standardized metadata to describe RepositoryItems
• RegistryObject: instance of metadata

ebRIM Summary

• ebRIM stores any type of content as RepositoryItems in a repository
• ebRIM stores standardized metadata describing the content as RegistryObjects in a registry

Library metaphor

RegistryObject subclass groups

Customizing ebRIM: extension packages

• additional types of extrinsic objects and external links
• additional associations that link registry objects
• additional classification schemes or classification nodes
• additional predefined queries

Basic Extension Package (OGC 07-144r4)

• Classification Schemes:
  • ISO 19119 services taxonomy
  • Geographical regions of the world
  • Digital Geospatial Information Working Group (DGIWG) Feature Data Dictionary concepts
• Geographic datatypes defined in ISO 19107 spec
• Associations: OperatesOn, DescribedBy, ...

CSW operations (1/2)

• GetCapabilities: to retrieve essential capabilities and non-computational characteristics of a service
• DescribeRecord: to discover the information model(s) supported by the catalogue and to retrieve type definitions
• GetRecords: to search the registry and retrieve all or some of the items in the result set
• GetRecordById: to retrieve a representation of one or more registry objects by identifier

CSW operations (2/2)

• GetDomain:to retrieve the value domain for a specified data element or request parameter
• GetRepositoryItem: to retrieve the repository item corresponding to some extrinsic object
• Harvest: enables a "pull" style of registration whereby a resource is retrieved from some remote location and inserted into the catalogue
• Transaction: to directly insert, update, or delete catalogue content

CSW conformance levels

• Level 0: generic behaviour common to all CSW-based services
• Level 1: (required) search and retrieval capabilities
• Level 2: (optional) update facilities to manage registry content

The conformance level for a given implementation can be inferred from the content of the service Capabilities document.

CSW views mapped to ebRIM

CIM queries

A GetRecords element must include a query statement

• Query: OGC Filter
• AdhocQuery: Stored Query
• AdhocQuery: specified query, query language identified by attribute

CIM Spatial References

• Location identifiers: place names, country subdivisions, ..
• Geographic coordinates: GML 3.1, associated with coordinate reference system (CRS)

GetRepositoryItem

• Specific operation for CSW-ebRIM profile
• Retrieves the repository item (ISO document) corresponding to some extrinsic object

Index: GeoNetwork ebRIM

• European Space Agency HMA program
• Geonetwork opensource
• ebRIM & CSW profile
• GeoNetwork ebRIM
• GeoNetwork future architecture
• Questions

Geonetwork EbRIM architecture

Geonetwork EbRIM technologies

• Maven 2 to manage lifecycle
• JUnit 4 for unit testing
• Model driven development using Jibx for marshalling/unmarshalling objects
• Axis 2 for web services
• Hibernate and Hibernate Search (Lucene indexing) for persistence and searching

Model driven development: What it's? (1/3)

• An approach to software development in which the focus and primary artifacts of development are models (as opposed to programs) and model transformations

Model driven development: Jibx (2/3)

• Tool for binding XML data to Java objects
• Decouples the domain model from XML representation

Model driven development: Jibx binding example (3/3)

Web services (1/2)

• Axis 2 web services created from WSDL 1.1 service descriptions for the CSW-ebRIM catalogue application profile
• Use of Jibx to unmarshall/marshall request and responses

Web services (2/2)

Persistence layer

• Hibernate
  • ORM (Object Relational Mapping) library
  • Simple query language (HQL) to query database (internally translated to SQL)
• Apache Lucene
  • Indexing library to add searching capabilities to applications
• Hibernate Search
  • Library that combines Hibernate and Apache Lucene
  • Indexes the domain model taking care of database/index synchronization
  • In searching brings back regular domain objects from free text lucene syntax queries

Limitations

• Compliance level 1
  Missing operations: GetDomain (optional)
• Compliance level 2 (optional)
  Missing operations: Transaction, Harvest
• Only spatial queries using a bounding box are supported

Index: GeoNetwork future architecture

• European Space Agency HMA program
• Geonetwork opensource
• ebRIM & CSW profile
• GeoNetwork ebRIM
• GeoNetwork future architecture
• Questions

Objectives

• Easily deployable in a horizontally scaled configuration
• Smaller release cycles for individual components
• Use of an ESB for loose coupling between components and provide basic services:
  • Routing messages to intended components
  • Message validation
  • XSLT transformations
  • Authorization invocation

Proposed architecture

references

this presentation: http://geonetwork.tv/ebrim

OASIS ebRIM: http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=regrep

OGC stuff: http://www.opengeospatial.org/standards/cat

GeoNetwork Open Source: http://geonetwork-opensource.org/

Index: Questions

• European Space Agency HMA program
• Geonetwork opensource
• ebRIM & CSW profile
• GeoNetwork ebRIM
• GeoNetwork future architecture
• Questions

Questions

thank you !