Archive Information Packages for NASA HDF-EOS Data

Archival Information Packages for
NASA HDF-EOS Data
R. 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
Archive Information Package

1

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


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
Describes the editor
e.g., creator orobject
using some external standard
Describes object creation, storage,
e.g., MARC, FGDC, Dublin Core
intellectual property rights, source
info, provenance, etc.
Provides an inventory of all of the
e.g., PREMIS
files that are part of the object
described
A physical or logical map of the
organization of the materials
described
Allows specification of hyperlinks
between parts of the map (mostly
useful when preserving websites)
Used to associate executable code
with parts of the content


Metadata Standards - Descriptive Metadata

Derived from

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


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

1



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


PREMIS - Entity-Relationship Diagram
Intellectual
Entities

Objects

“an action that involves at
least organization, or
Rights
“a“a coherent set of content
person,one object or agent
known to the of information
software program associated
“a discrete unitpreservation
that is reasonably
repository”
with described as a unit” in
preservation events
in digital form”
thee.g.,example,archived,
For created, a data file
life of a web site,
For example, an object” data
migrated or more
e.g., Dr. Spockofof data it
“assertions donated sets
set or collection one
rights or permissions
pertaining to an object
or an agent”
e.g., copywrite notice, legal
Events
statute, deposit agreement


Agents

Is there a metadata standard for AIP
information?
PREMIS

ISO 19115

1



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


Program Plan (Modified)
ISO-19115
CDM/NetCDF4

ECS to
METS
(Data Set)

HDF5-AIP
NetCDF4 /
HDF5 Data

METS

NetCDF4/HDF5-data

ECS to
METS

NSIDC/ECS
Metadata

(Granule)

H4to
H5


NSIDC/ ECS
HDF4-data

HDF5 Granule Level Archive Information
Packages
Data file

HDF5

Metadata file

METS

Primary Schema

Extension Schema

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

PREMIS

HDF5 AIP Components

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


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.


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