Registering Earth Science Data and Data Related Services Using NASA’s Global Change Master

Directory (GCMD)

Tyler Stevens (GIS/Services Coordinator)ESIP Federation Meeting

Technical Breakout Session 2AJanuary 9, 2008

Discussion Outline

I. Why Register in the GCMD?

II. Registering Data Sets and Services

III. Additional Registration Methods

IV. Demonstration of Metadata Authoring

Tool

I. Why Register in the GCMD?

1. For Enhanced Data and Service Discovery-Controlled Science Keywords, Ancillary

Keywords (Data Centers, Instruments, Projects,

Platforms, Locations)-Keyword Refinements

2.For Direct Access to Data and Services-Related URL > Get Data-Related URL > Get Service

3. For Metadata Content and Wide Usage

4. For Metadata Interoperability-FGDC, ISO

1. Enhanced Data Discovery Through GCMD’s Controlled

Keyword Sets• Science Keywords• Services Keywords• Locations• Instruments *• Platforms *• Spatial/Temporal

Data Resolution Range

• URL_Content Type• Chronostratigraphic

Units• ISO Topic Category• Data Set Language• Data Centers *• Personnel *• Projects *

• *Authors may create new entries, but software checks for uniqueness & consistency.

• Unique Entry_IDs are also assured.• Required

1. Enhanced Data Discovery Through Keyword Refinements

Keyword Refinement

Options

Refine by Category Full Text

“Breadcrumbs”

2. Direct Access to Data and Services

GET SERVICE > ACCESS MAP VIEWER

Provides access to geo-referenced geospatial data in a web interface.

Got Data?

GET DATA

3. Metadata Content

3. Wide Usage

North America

Europe

Asia

Australia

South America

Africa

Other

January 2007- December 2007

Global Usage

1. Develop an XSLT Stylesheet based on mapping

XSLT Editor

Sample FGDC XML document

Edit XSLT Stylesheet

DIF XML

FGDC XML Formatted DIF XML

Translate using Xalan

Format using HTML Tidy

DIF HTML

2. Translate and Format Document

4. Metadata Interoperability

3. Submit to the GCMD

II. Registering Data Sets and Services

Online Metadata Authoring Tool

Validate

Preview

Submit to GCMD

Metadata in Queue

QA/QC Metadata and Load Into Database

Metadata In Database

Retrieve from Database to Update

III: Additional Registration Methods

• Metadata Harvesting/Metadata Transfer OAI-PMH Z39.50

• Bulk Metadata Transfer/Ingest

Why OAI-PMH?

OAI Server independent of main database

Administrator controls metadata availability

Queries standardized

Software is open source

Metadata Compatibility

•Dublin Core, FGDC, DIF, ISO-19115

•XSLT or XML Schema

Database

Computer running harvester software

OAI-PMH Repository

I.I.

II.II.

OAI-PMH Architecture for Metadata Harvesting

Metadata Transfer/Ingest

Z39.50

Rsync

FTP

Bulk XML

GCMD Coordinators

Metadata In Database

OAI-PMH

Validate

Publish

IV. Demonstration of Metadata Authoring Tool

Thank You

Tyler Stevens (GIS/Services Coordinator)Tyler.B.Stevens@nasa.gov

Special Thanks to GCMD staff for their assistance and contributions.

Picture Credit: Home Town USA Inc – Washington D.C.