ECHO Services Discussion

WGISS 18

September 6-10, 2004

Beijing, Peoples Republic of China

Robin Pfister

NASA/GSFC

ECHO OverviewNative Services

• Metadata Clearinghouse (Registry)– ECHO makes the data holdings of the Earth Science Enterprise available to clients as if they had

a copy of all the metadata in their system

• Order Broker– ECHO provides a single interface for clients to place orders through and deals with the complexity

of ordering from its partner systems on behalf of the client

• User Account Management– While not a primary feature of the system, ECHO provides flexible user account management for

both registered users and providers in support of its registry and brokering roles

• Service Registry– ECHO provides a mechanism for clients to find out what Earth Science services are available

dynamically. ECHO provides the mechanism for services to express their relationship to Earth Science data

• Service Broker– ECHO will allow a client to order data from a data provider and then have a series of services

applied to it by relying on ECHO to do the coordination

• Open Source: http://opensource.arc.nasa.gov/

The Big Picture• Enabling Technology

– Middleware, not GUIs

• Marketplace– Providers offer their wares– Consumers find what they like and access it

• Interoperable Registries – Data

• Metadata Catalog/Clearinghouse• Inventory Level

– Services• Service Registry• Web Services Technology• Service User Interfaces (UIs)

– Interoperable Through Registry Taxonomies

ECHO in the EnterpriseClients

DataAcquisition

DataProcessing

Archive

Delivery/Fulfillment

…ECHO DataRegistry

ECHO ServiceRegistry

Enterprise Middleware

…

Definition and Usage

• Service - A capability offered by a provider.

• By participating in ECHO, the service’s interface is declared using standard semantics and technology (WSDL, SOAP) in a way that potential users can find, understand and access.

• Types of Services - Advertised, Brokered, Chained

Service MiddlewareUses a Service Oriented Architecture

(SOA)ECHO Client

Service ProviderBind

ECHO Operations

(from Use Case View)

ECHO Service Registry

PublishFind

manages

<<UDDI>>

<<SOAP>>

<<WSDL>><<UDDI Query>>

Service Capability Status

• Advertised services - operational

• Service Brokering - initial studies in progress; prototyping to begin soon.

• Service Chaining - will follow brokering.

Service BrokeringService Provider

Service Registry Metadata Catalog

ServerClient

Discover DataRequest Service

Invoke Service

Publish Service

Data Provider

Mainframes

Publish metadata

Access Data

Move Data (Control)

Send Results

Ultimate Goal is Service Chaining: A Distributed Virtual Computer

Service Provider

Service Registry Metadata Catalog

ServerClient

Request Service Chain

Data Provider

Mainframes

Access Data

Move Data (Control)

Service Provider

Server

Service Provider

Server

Move Data

Move Data

Move Data

Potential Topics for Follow-up Services Presentation in February

• Brokering Issues and Solutions

• Service Chaining Model

• Classification of Services in the Enterprise– Incl. What do we do when it evolves (issues

related to change)

• Federating these registries

Other Items of Interest…

ECHO Data Partner StatusStatus Organization Collections Browse Images Granules (data items)

Operational Alaska SAR Facility 14 (all restricted) 0 1,759,106 (all restricted)

Operational Goddard ECS DAAC (GDAAC)

357 981,867 16,965,099

Operational Land Processes EOS Core System (ECS) DAAC (LPDAAC)

85

(14 restricted)

2,132,233

(7,316 restricted)

10,867,820

(16,938 restricted)

Operational Atmospheric Sciences Data Center (ASDC)

91

(all restricted)

709,064

(all restricted)

1,705,492

(all restricted)

Operational Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC)

653 0 105,124

Operational Socioeconomic Data and Applications Center (SEDAC)

50

Collections are orderable items

0 0

Operational Stennis Space Center Data Purchase Project

22

(all restricted)

0 2,932

(all restricted)

Test National Snow and Ice Data Center (NSIDC) DAAC

35

(all restricted)

0 62,066

(all restricted)

Totals (public/restricted): 27,921,105 /3,546,534

3,106,784 / 716,308

1,131 / 176

OGC-ECHO Adaptor

• The OGC-ECHO Adaptor (OEA) will provide a mechanism to present ECHO holdings in an OGC-compliant fashion.

• It will service Z39.50 GEO profile catalog requests

• The Earth Science Gateway Portal (Geospatial One-Stop) is the client that is driving this development.

• The OEA will comply with version 1 of the OGC Catalog Services Specification (http://www.opengis.org/docs/02-087r3.pdf).

System Interoperability

• As we move to ECHO, the EOS Data Gateway is also being modified to interoperate via ECHO.

• For distributed searching we were hoping to move into current technology by replacing the V0 interoperability mechanism with an OGC standards based mechanism.

• We’d like feedback from those who are currently interoperable if moving to OGC interoperability standards is okay.

• Please send e-mail with responses, and also concerns and discussions. robin.g.pfister@nasa.gov

Thank you