Archelon 1.0 has Reached the Ocean Production!

U.S. Fish and Wildlife Service Southeast Region / CC-BY-2.0

Archelon?

Dmitry Bogdanov / CC-BY-3.0

Archelon?

• Named for an ancient genus of giant sea turtles
• Name means “ruler turtle” in Greek.
• Lived ~80.5 million years ago in North America
• Largest ever recorded species of turtle by size
• Second largest by weight
• https://en.wikipedia.org/wiki/Archelon

Screenshot: Home Page

Screenshot: Search Results

Screenshot: Details Page

Screenshot: Details Page, Cont'd

The Stack

• Fedora 4.7.0
• Solr 6
• Loris IIIF Image API Server
• PCDM Manifests IIIF Presentation API Server
• Mirador IIIF Viewer

Solr 6: Subqueries

• Index the pcdm:hasMember field:

  pcdm_members = pcdm:hasMember :: xsd:string

• Use subquery to get title at query time:

  <str name="fl">*,pcdm_members_info:[subquery]</str>
  <str name="pcdm_members_info.q">{!terms f=id v=$row.pcdm_members}</str>
  <str name="pcdm_members_info.fl">id,title,component</str>
  <str name="pcdm_members_info.rows">100</str>

PCDM Manifests

• In-house developed Rails app
• (Partial) implementation of the IIIF Presentation API
• Converts RDF metadata modelled in PCDM to JSON format defined by the IIIF Presentation API
• Serves IIIF manifests for newspaper issues
• Redirects requests for pages to their corresponding issue
• https://github.com/umd-lib/pcdm-manifests

Performance Challenges

• PCDM Manifests initially talked directly to Fedora 4
• Lots of requests
• Much...too...slow

Solution

• Index all metadata needed to generate manifests in Solr
• Talk to Solr instead of Fedora 4 directly
• Single request returns all info needed
• Much faster!

Loris Image Server

• Using version 2.1.0
• Contibuted code back to the Loris community
• https://github.com/loris-imageserver/loris

Loris to Fedora Connection

• Using the templated HTTP resolver
• Maps prefixed CURIE-style IIIF IDs:

  fcrepo:pcdm%2Fd3%2F05%2Fa8%2F4f%2Fd305a84f-6287-439c-b20d-b3d19e05aa44

• To Fedora 4 URIs:

  https://fcrepo.lib.umd.edu/fcrepo/rest/pcdm/d3/05/a8/4f/d305a84f-6287-439c-b20d-b3d19e05aa44

• Images are cached by Loris after first retrieval from Fedora

Mirador IIIF Image Viewer

• Static wrapper around a forked build of Mirador
• Embeddable via <iframe>
• Some custom code contributed back to community
• Some changes are unique to UMD
• https://github.com/umd-lib/mirador-static
• https://github.com/umd-lib/mirador

Mirador Customizations Presentation

• Code4Lib 2017 Poster Presentation
• “Newspapers Re-Issued: Developing a custom IIIF newspaper viewer at the University of Maryland Libraries”
• http://drum.lib.umd.edu/handle/1903/19172

Putting it All Together

What’s Next?

U.S. Fish and Wildlife Service Southeast Region / CC-BY-2.0

Planned Features for 1.1

• OCR text search
• OCR hit highlighting
• Article segmentation
• Implemented with Web Annotations
• https://www.w3.org/TR/annotation-vocab/

Beyond 1.x: Writing to the Repo

• Complete management of digital objects
• Hydra-based (?)
• Access control management
• Batch-loader integration

Repository Goals

• Continue loading new content first
• Migrate Fedora 2 content to Fedora 4
• Move off of direct filesystem storage for binaries
• General-purpose cache to replace Loris' custom cache
• Retain our repository-centric model

Archelon on GitHub

• https://github.com/umd-lib/archelon

Image Links

• Leatherback Sea Turtle Hatchlings
  https://commons.wikimedia.org/wiki/File:Leatherbacks_crawling_to_the_sea.jpg
• Archelon Restoration
  https://commons.wikimedia.org/wiki/File:Archelon1DB.jpg