Using the ESA Service Support Environment to provide web services at the NEODC

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/