Service Support Environment

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Service Support Environment
Yves Coene, SPACEBEL Simone Gianfranceschi,
Intecs Steven Smolders, GIM
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Table of Contents

• Overview
• Tools
• Standards
• Future work

3
SSE Objectives

• Orchestrate synchronous and asynchronous EO
  Services for online and offline processes
• Provide an overarching infrastructure, neutrally
  managed by ESA
• Empower service providers through abusiness
  process management (BPM) platform
• Easily deploy and deliver services to users from
  own infrastructure
• Minimize service providers upfront investments
• Open standards to facilitate adoption and
  evolution

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Service Oriented Architecture

• SOA
• Approach to develop reusable services
• Loosly coupled
• Expose functionality in modular fashion
• Avoids duplication
• Reduces total number of processes
• Combine services according to a business process
  "orchestration".
• SOA implemented using Web services

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SSE Toolbox
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Table of Contents

• Overview
• Tools
• Standards
• Future work

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Service Publishing Steps

• Publish service as Web service
• SSE Toolbox
• Orchestrate services
• BPEL Designer creating workflows
• or use default workflows
• Register service on SSE Portal
• Fill out Web form and configure AOI component
• Monitor service processes "in-flight"
• BPEL Console

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Step 1 Toolbox

• Allows easy Web service publishing
• Provides a generic gateway towards service
  providers infrastructure (e.g. DBMS, File
  System, API)
• Supports also services with NO infrastructure
  behind
• Interface towards the Service Provider
  infrastructure based on widely accepted IT
  standards
• Permits to translate local terms into SSE ones
  (no need to change Service Provider
  infrastructure)

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Step 2 Service Orchestration

• Workflow editor to chain services ...

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Step 3 Service Definition Panel
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Step 4 Service Monitoring
Workflow console to monitor service instances
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Table of Contents

• Overview
• Tools
• Standards
• Future work

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• WSDL (W3C)
• WSDL file for each service, generated by SSE
  Toolbox
• Defines available service operations
• Each operation has parameters. Types defined in
  XML Schema (W3C)
• Operations have (mainly) SOAP bindings
• Apache WSIF (WS Invocation Framework) allows
  using WSDL for other bindings such as XML/HTTP
  (OGC WMS, WFS, WCS), email, etc.

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Interaction Model

• Predefined "basic" operations per service
• Search returns matching catalogue entries
• Present retrieves all available "metadata".
• Request Quotation returns information about the
  service, e.g. feasibility, pricing, alternatives
  etc.
• Order activate the service.
• Customised operations
• Can be mapped to a workflow
• Workflow can call any Web service

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Interaction Model

• WS-Interoperability (ws-i.org)
• Request/Response (synchronous)
• Basic callback (asynchronous)

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• ws-addressing (W3C)
• asynchronous communication correlation of
  messages.
• SOAP (W3C)
• message-based (i.e. document-style)
• Over HTTP, firewall-friendly, platform neutral
• Optional use of HTTPS / SSL
• De-facto standard J2EE and Microsoft .NET
• Interface is formalised using WSDL

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• BPEL (OASIS)
• Standard to orchestrate Web services into process
  flows
• Invoke Web services synchronous / asynchronous
• Manipulate XML documents (XPath, XSLT)
• Rich language if / while / parallel, exceptions,
  events etc.
• Expose process flow as Web service
• Many implementations SeeBeyond, IBM, Oracle,
  Intersystems etc.

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Orchestration Example
Spot Vegetation Sensor S10
User needs
Carbon flux over Belgium in GeoTIFF format
(Kyoto Protocol verification)
Format Conversion
GeoTIFF
HDF
Data Provider
Value Adder
Automation of Business Process
Data Provider
Service Provider
Net Flux of Carbon Map (HDF)
Clipping
Europe
Belgium
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• ws-inspection
• Service discovery from "BPEL Designer"
• Alternatives UDDI and OGC catalogue

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Catalogue Access

• Currently ESA EOLI-XML ICD (SOAP) Search/Present
• OGC Catalog 2.0 (Catalogue Services for the Web)
  being investigated.
• EOLI-XML may become OGC Profile (Harmony Project
  with OGCE)

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• Data distribution mechanisms
• SOAP data included in SOAP payload
• FTP/HTTP URL passed in SOAP payload
• WFS - to publish service results (vector data)
• WCS - to publish service results (raster data)
• ESA DDS data delivery via satellite

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• OGC Standards
• WMS - superimpose layers and service results
• Layers can be results of workflows

ERS SAR catalogue
Envisat ASAR catalogue
RadarSat catalogue

Wave height direction model
Ship detection
processor
ERS SAR online data access
O il spill detection
processor
ERS SAR online data access
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• OGC Standards
• WMS Catalogue search results can be shown on map
• Web Map Context allow to save/load context

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• OGC Standards
• GML for AOI encoding
• GML for service results

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• Gazetteer (Alexandria) - to select rectangular AOI

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• Gazetteer (Alexandria) to select circular AOI

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Table of Contents

• Overview
• Tools
• Standards
• Future Work

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OGC Standards

• Better support for Service Result Symbology
  OGC s Styled Layer Descriptor Language (SLD)

ltStyledLayerDescriptorgt . ltRulegt
ltPointSymbolizergt . lt/
PointSymbolizergt lt/Rulegt
. lt/StyledLayerDescriptorgt

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OGC Standards

• OGC WFS
• Vector data
• Client-side or Portrayal service rendering
• OGC WCS
• Raster data
• Client-side or Portrayal service rendering
• Can be combined with coordinate transformation

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Manual Service Steps

• Supports 100 manual service via task list
• Service provider can enters service result as
  text (e.g. URL)
• Also manual services can be "chained"

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Data Distribution via DDS

• Send "data" via ESA DDS as last "step" in any SSE
  service workflow.
• Uses Eutelsat C-band

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Data Distribution via DDS

• DDS is additional way to disseminate service
  results, e.g. in Africa.

NPPService VITO
Format Conversion Service GIM
AOI selection(SSE)
Data Dissemination System
NPP-Africa-GeoTIFF
NPP-Africa-GeoTIFF
NPP-Africa-HDF
NPP input AOI description required format
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Data Distribution via DDS

• SSE as front-end of product distribution for
  service providers.

FTP Server
Product upload
destination selection(SSE)
OGC Web Coverage Server
Data Dissemination System
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More info

• 3 afternoon sessions
• SSE CD-ROM
• Flash presentation
• SSE and BPEL White Papers
• SSE User Manuals
• Software Toolbox, Eclipse, BPEL Designer
• http//services.eoportal.org (Documents section)

Thank you !