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Stanford Digital Repository. PREMIS & Geospatial Resources. Nancy J. Hoebelheinrich Knowledge Motifs [email protected] To Be Discussed. An Overview of PREMIS data elements especially important for Geospatial Resources Examples from Geospatial Resources Issues & discussion.

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Premis geospatial resources

Stanford Digital Repository

PREMIS & Geospatial Resources

Nancy J. Hoebelheinrich

Knowledge Motifs

[email protected]

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


To be discussed
To Be Discussed

  • An Overview of PREMIS data elements especially important for Geospatial Resources

  • Examples from Geospatial Resources

  • Issues & discussion

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


Simple example of use of premis object data elements
Simple Example of use of PREMIS Object Data Elements

  • Applied at file level

  • Automatic insertion by Ingest code to retain important provenance info for each file before moving into the preservation repository

    • Original file name from data provider

    • Original checksum

    • Original file size

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


Premis object excerpt v1 1
PREMIS Object Excerpt (v1.1)

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


More about premis object relationships
More about PREMIS Object relationships

  • Defined as associations b/w two or more:

    • Object entities or

    • Entities of different types, e.g., an Object & an Agent.

  • Recorded for long term preservation purposes

  • Typical relationship types = structural (component of representation), derivative (format varieties), dependent (required schema or database structure)

  • Could be expressed using other schemas for packaging the resource such as METS or XFDU or MPEG DIDL

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


Use of premis rights data elements
Use of PREMIS Rights data elements

  • Applied at representation level

  • Reference to donor’s Deposit Agreement (using METS)

  • Key info from the ingested Deposit Agreement for immediate playback

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


Premis rights excerpt v1 1
PREMIS Rights Excerpt (v1.1)

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


Use of premis event for simple event

Event 1:

Transform of descriptive MD from MS Access db => XML => MODS

Applied at representation level

Why this event?

In case of questions from outside data provider

Retain singular scripts & transform mechanisms

Test practicability of recording such events in production environment

Use of PREMIS Event for simple event

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


Premis event excerpt v1 1
PREMIS Event Excerpt (v1.1)

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


Another example gis dataset street network of given metropolitan area

Dataset 1: official street centerline file used by emergency services to locate street addresses

Dataset 2: aspects of the road network including topography, angles & geometry of the road network used for a tourist map

Another example: GIS Dataset: Street network of given metropolitan area

Event to be documented:

Merge c:\temp\states1;c:\temp \states2; c:\temp\USA

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


Use of premis event data elements

Want to describe full process of data creation emergency services to locate street addresses

Includes “merge” and data sources

Advantage of PREMIS – can describe events once in repository

Why this event?

Important to describe processes during different phases of lifecycle, even prior to ingestion

Use of PREMIS Event Data Elements

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


Use of premis agent data elements

For data management within the repository emergency services to locate street addresses

Audit trail for descriptive MD

Version of Ingest code?

Data provider who created / altered the resource or the metadata, e.g., USGS which added FGDC MD to HRO from Monterey Bay Water Resource

Use of PREMIS Agent Data Elements

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


Premis geospatial data comments based on experiences
PREMIS & Geospatial data -- Comments based on experiences: emergency services to locate street addresses

  • Works well when:

    • Domain specific MD exists, e.g., FGDC for descriptive and technical MD

    • There are levels of the resource with MD to be associated, e.g., at representation & file(s) level

    • Need to document various points in the lifecycle of the data

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


Premis geospatial data comments based on experiences1
PREMIS & Geospatial data -- Comments based on experiences: emergency services to locate street addresses

  • In earlier versions of PREMIS unclear how to document:

    • Context

    • Environment including at time of creation

    • “Significant properties”

    • Existence of geospatial format registries

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


Premis v 2 0 more flexible
PREMIS v 2.0 more flexible emergency services to locate street addresses

  • Still XML binding

    • Allows for containers

    • Allows hierarchical relationships

    • Extensible by use of new <premis:extension> element to insert other elements, XML fragments, e.g., technical MD, provenance metadata, etc.

  • Board considering the inclusion of mechanism used by packaging schemas to “wrap” or “reference” other metadata

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


Premis complex geospatial data

For more detail, see “An Investigation into Archiving Geospatial data Formats “ prepared for NGDA Project, funded by NDIIPP (http://www.ngda.org/research.php)

Formats examined

Approaches of FGDC, PREMIS, and Center for International Earth Science Information Network (CIESIN)‘s Geospatial Electronic Record (GER) model on basis of:

Environment/ computer platform

Semantic underpinnings

domain specific terminology

provenance

data quality

appropriate use

PREMIS & Complex Geospatial Data

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


Examples of geospatial context
Examples of Geospatial “Context” Geospatial data Formats “ prepared for NGDA Project, funded by NDIIPP (

  • Placing dataset in Time & Space

  • Semantic underpinnings, e.g.,

    • Abstract

    • Description of purpose / research methodology

    • Intended use of data to avoid misinterpretation or misuse

  • Where to put?

    • FGDC has place

    • PREMIS would not necessarily consider this as “preservation” metadata, but rather “descriptive” or technical MD, however see v 2.0

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


Examples of environment and or significant properties for geospatial data
Examples of “Environment” and/or “Significant properties” for geospatial data

  • HW info pertinent at time of data creation

  • SW info pertinent at time of data creation (?)

  • Lineage or “provenance” data e.g., to communicate processing steps used to create scientific data product

  • Events, parameters & source data which influenced or impacted the creation of the data set prior to its ingestion into the archive in order to full understand the data that you’re getting

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


Environment significant properties continued
“Environment” & “Significant properties”, continued…

  • Data Quality – describing completeness, logical consistency, attribute accuracy

  • Data Trustworthiness – data creator / provider reliable? = “authentic”

  • Data Provenance – processes & sources for dataset = “understandable & reliable”

  • Understanding of the specific needs of the “designated community”

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


Questions comments

Questions? / comments? continued…

Nancy J. Hoebelheinrich

[email protected]

PREMIS Implementation Fair, San Francisco, CA October 7, 2009


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