Archive Information Packages for NASA HDF-EOS Data

Archival Information Packages for NASA HDF-EOS DataR. Duerr, Kent Yang, Azhar Sikander

Outline

• What is an Archival Information Package? HDF-AIP

• Standards? What Standards? METS DIF/FGDC/ISO 19115-2 PREMIS

• Results• Next Steps

Archival Information Packages for NASA HDF-EOS Data, presented 11/4/09 by R. Duerr HDF and HDF-EOS Workshop XIII


OAIS Reference Model1

1 Reference Model for an Open Archival Information System (OAIS), CCSDS 650.0-B-1, Blue Book, January 2002.

Archive Information Package

Archival Information Package Contents

• Content Information The data object to be preserved Information that describes the data object

o Typically interpreted as the syntax and semantics of the file structure

• Preservation Description Information Provenance – Origin or source of the data, any changes that have

taken place since, and who has had custody of it

Fixity – the authentication mechanisms (with keys) needed to ensure that the data object has not been altered in an undocumented manner

Reference – identification mechanisms and values

Context – relation of the object to its environment


HDF-Archive Information Packages

• The HDF group was funded to investigate and propose a design for a complete archival information package for HDF data files

• The result was a METS metadata file to accompany the HDF data file


http://www.hdfgroup.org/projects/hdf5_aip/hdf5_aip_wp.html

Metadata Standards - METS

• Metadata Encoding and Transmission Standard

• An initiative of the Digital Library Federation• Provides the means to convey the metadata

necessary for management of digital objects within a repository exchange of objects between repositories (or

between repositories and their users)

• Designed to facilitate shared development of information management

tools/services interoperable exchange of digital materials


METS - A very brief overview

Describes the METS document itself

e.g., creator or editorDescribes the objectusing some external standard

e.g., MARC, FGDC, Dublin CoreDescribes object creation, storage, intellectual property rights, source

info, provenance, etc.e.g., PREMISProvides an inventory of all of the

files that are part of the object described

A physical or logical map of theorganization of the materials

describedAllows specification of hyperlinksbetween parts of the map (mostlyuseful when preserving websites)Used to associate executable code

with parts of the content



Metadata Standards - Descriptive Metadata

• Discovery, Assess and Access Metadata GCMD DIF FGDC CSDGM ISO 19115

Derived from

Metadata Standards - ISO 19115:2003

• The international equivalent of the FGDC standard

• Most fields can be mapped or generated from FGDC metadata

• The exception is the Dataset Topic Keywords

• Allows for national profiles


Metadata Standards - ISO 19115:2003



Is there a metadata standard for AIP information?


Archive Information Package

Preservation Metadata Implementation Strategies (PREMIS)

• Provide a core preservation metadata set with broad applicability across the digital preservation community

• Developed by an OCLC and RLG sponsored international working group Representatives from libraries, museums,

archives, government, and the private sector.

• Maintained by the Library of Congress• Based on the OAIS reference model


Rights

Events

Agents

“a coherent set of contentthat is reasonably

described as a unit”For example, a web site, data set or collection of data sets

“a coherent set of contentthat is reasonably

described as a unit”For example, a web site, data set or collection of data sets

“a discrete unit of information in digital form”

For example, a data file

“a discrete unit of information in digital form”

For example, a data file

“assertions of one or more rights or permissions

pertaining to an objector an agent”

e.g., copywrite notice, legalstatute, deposit agreement

“assertions of one or more rights or permissions

pertaining to an objector an agent”

e.g., copywrite notice, legalstatute, deposit agreement

“an action that involves atleast one object or agent

known to the preservationrepository”

e.g., created, archived,migrated

“an action that involves atleast one object or agent

known to the preservationrepository”

e.g., created, archived,migrated

“a person, organization, orsoftware program associatedwith preservation events in

the life of an object”e.g., Dr. Spock donated it

“a person, organization, orsoftware program associatedwith preservation events in

the life of an object”e.g., Dr. Spock donated it

PREMIS - Entity-Relationship Diagram

IntellectualEntities

Objects



Is there a metadata standard for AIP information?


PREMIS

ISO 19115

NOAA Data Stewardship Prototype

• NSIDC and THG demonstrated the feasibility of migrating NASA data to a standard HDF-AIP format

• Motivation:


Technologies change regularly, organizations come and go, but data must

survive

But preserving data takes more than just preserving the bits, all the components of an

AIP are critical

Project Goals

• Prototype development of Archive Information Packages for HDF data: For entire data sets For individual “granules”

• Test usability of digital library standards with geospatial data


NetCDF4 / HDF5 Data

METS

NSIDC/ ECS

HDF4-data

ISO-19115

H4toH5

ECS to METS

(Data Set)

CDM/NetCDF4

ECS toMETS(Granule)

NSIDC/ECS

Metadata

HDF5-AIP

NetCDF4/HDF5-data

NetCDF4 / HDF5 Data

NSIDC/ ECS

HDF4-data

H4toH5NetCDF4/HDF5-data

Program Plan (Modified)


Data file HDF5

METS

Primary Schema Extension Schema

|<mets>|---<dmdSec>----------------<ISO 19115>|---<amdSec>--------------|--<techMD>| |--<rightsMD> PREMIS| |--<sourceMD>|----<fileGrp>|----<structMap>

http://www.hdfgroup.uiuc.edu/papers/papers/AIP/HDF5_AIP_White_Paper.pdf

HDF5 AIP Components

Metadata file

HDF5 Granule Level Archive Information Packages


File Level AIP Activity Status

• Developed a map from NSIDC/ECS metadata to METS/PREMIS/ISO 19115 components

• Prototype software completed• Issues

What goes in PREMIS vs ISO 19115? Auxillary file handling - own AIP or not?

o E.g., browse files, processing history, PGE’s

Granules vs files


Issues and Questions

• Inconsistent use of terminology between standards – for example, what is a data set?

• Many of the standards care about distribution formats Are these even relevant concepts any

more? Do you really want to have to update the

metadata record just because a new distribution format was added?

What about new access services?


Next Steps

• NSIDC is updating our non-ECS data systems handling of metadata including support for PREMIS, etc. metadata on all holdings

• Work underway to upgrade granule level metadata for NSIDC flagship sea ice products (PREMIS/METS/ISO AIP packages)

• Work to improve archivability of data stored in HDF formats on-going – NASA implementing a standard XML description of contents across its archives


Acknowledgement

This work was supported under NOAA Scientific Stewardship Program grant number

NA07OAR4310286. Any opinions, findings, and conclusions or recommendations

expressed in this material are those of the author(s) and do not necessarily reflect the

views of NOAA.


Archive Information Packages for NASA HDF-EOS Data

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