Using the ESA Service Support Environment to provide web services at the NEODCMatt PritchardSteve Donegan

NERC Earth Observation Data Centre

Outline

• NEODC

• ESA Service Support Environment

– Overview

– Service Definition & Deployment

– Services

• NEODC Examples

NERC Earth Observation Data Centre

• EO Data– NERC Airborne data

• Multi/hyperspectral surveys

• DEM of UK

– (A)ATSR• Sea surface temperature

– …

ESA Service Support Environment

ESA Service Support Environment

Service Definition

• Interface Control Document (ICD)– XML Schema defines messages

exchanged during service operations• Search (optional)• Present (optional)• RFQ (optional)• Order

– Synchronous & asynchronous mode supported

Service Definition

• Operation scripts– XML script for each operation

• E.g. search– Process user input from portal– Execute search operation– Return search result

SSE Toolbox

• Kit for service providers (free Tomcat webapp)– GUI to create / deploy / test services– Not required, but makes life easier – XML scripting language provides rich set of features for

creating services• JDBC, XML handling, interaction with own Java classes

• Service “lives” in Toolbox– At service-provider side

• Can deploy own services in own engine if preferred, as long as they conform to SSE ICD

– Portal marshals messages to/from service at service provider site

SSE Portal

• Provides GUI for interaction with services• For service providers:

– Register service– Upload

• Service schema• Service stylesheet• Service metadata

– Advanced features• Handling of asynchronous services

– Portal polls service at interval defined in script• BPEL-based GUI for process monitoring / debugging• Orchestration of service chains

– Component re-use encouraged

SSE Portal

• Provides GUI for interaction with services• For users:

– Discover services– Invoke services– Check status of orders– Retrieve service order result(s)– …

NEODC services

• ARSF processing service– GUI front-end to bespoke processing software

for airborne survey data

• (A)ATSR subscene extractor– Extraction of spatio-temporal subsets from

collection of per-orbit swath products

• (A)ATSR radiance log service– Plot timeseries of radiance values over given

location• Volcanology

AATSR Subscene Extractor

AATSR Radiance Log

Summary

• ESA Service Support Environment– Architecture, ICD, tools– http://services.eoportal.org

• Documentation for service providers

– Basis for new projects• ESA HMA : interoperable ground segment components

– Workshop for service providers 28-30 Oct 2008• http://www.congrex.nl/08m32/