Mike Smorul Saurabh Channan Digital Preservation and Archiving at the Institute for Advanced Computer Studies University of Maryland, College Park

Overview Digital Preservation Research –ADAPT Project and Components –Pilot Persistent Archive Digital Library and Production Data Distribution –Global Land Cover Facility Conclusion

A Digital Approach to Preservation Technology (ADAPT) Premise: –Preservation of digital entities into self- describing objects OAIS Information Packet model as a framework –Separation of management into three layers, bitstream, semantic, and access/discovery –Distributed and Secure Infrastructure Automatic ingestion and replication Policy-Driven Management of Preservation Processes Global Format Registry Separate Peer-to-Peer Deep Archive

ADAPT Architecture

ADAPT Components Ingestion –Producer-Archive Workflow Network (PAWN) Management of Preservation Processes –Lightweight Preservation Environment (LPE) Access and Discovery –Grid Retrieval and Search Platform (GRASP) –EAP Collection browser

Overall Principles (PAWN) Distributed, secure ingestion OAIS based Information Packet creation Use of web/grid technologies – platform independent Minimal client-side requirements Ease of integration with archive and data grid systems. Designed to satisfy data integrity requirements of scientific collections and digital preservation

Distributed Ingestion (PAWN)

Ingestion Workflow (PAWN) 1.Negotiate Submission Agreement. 2.Workflow Initialization and Submission Information Packet (SIP) creation. 3.Transfer of SIPs to Data Grid site. 4.Validation of SIP transfer 5.Organization of data into collections and transfer into Data Grid.

Component Overview (PAWN)

Target Collections (PAWN) Digital Image Collection –Rich metadata in various formats Web site crawling –Online and interactive content GLCF Landsat data –Spatial and temporal metadata –Large quantity (over 15,000 objects)

The Lightweight Preservation Environment is an archival system based on a modular design using grid and web services. The current implementation relies mostly on Globus technologies. Primarily, we’ve focused on wrapping logic around those components. Lightweight Preservation Environment (LPE)

Developed Components (LPE) Data Manager (DM): Organizes data and queries between the user and the other components Policy Manager (PM): Ensures that a minimum number of copies exist for any given file Transformation Manager (TM): Executes specific transformations on a named file on a given storage node and returns the results

Grid Retrieval and Search Platform (GRASP) Based on concepts developed in the Earth Science Data Interface (ESDI) developed at the UMIACS GLCF. Provides a graphical interface into data grid holdings. Access to entire GLCF holdings through the Storage Resource Broker(SRB)

GRASP Architecture

GRASP uses a data grid as an abstract storage repository. Metadata in the grid is mined from the grid itself or from external sources and published into a browsable form. –Data grids may allow for platform independent metadata, but may not be optimal for access

GRASP Screenshot

Global Land Cover Facility Mission: “The GLCF Mission is to encourage the use of remotely sensed imagery, derived products and applications within a broad range of science communities in a manner that improves comprehension of the nature and causes of land cover change and its impact on the Earth.” Goal: “The GLCF Goal is to provide free access to an integrated collection of critical land cover and Earth science data through systems that are designed to maximize user outreach and that promote development of novel tools for ordering, visualizing and manipulating spatial data.”

Data Collections Majority of the holdings are of Landsat and MODIS data

Data Distribution Data at the GLCF –Approximately 5.1 TB compressed –Approximately 13 TB uncompressed Anticipated Production Rate –Triple or Quadruple current data holding within the next two year

Data Discovery Applications ESDI  Web Interface  User friendly  Search  Retrieve  Discover  Scalable  Over 9TB a month !

GLCF Architecture Scalable and Reliable

Participation Possibilities PAWN ingestion component –Minimal geospatial metadata support planned, can be expanded to support NGDA endpoint GRASP display component –Solid core components, end-user interfaces need additional polishing GLCF data holdings –Additional hardware required if additional data and access mechanisms (grid, etc) required Other possibilities include: grid infrastructure, GSI security, format registry, etc.

Questions