To unify these two collections, the SIO Archives Archivist and the San Diego Historical Society Project Archivist created a list of fourteen broad subject heading terms and assigned one or more terms to each image:
- Aerial Views
- Beaches
- Diving
- Events
- Fishing
- Fishing Industry
- Harbors
- Navigation And Communication
- Ocean Life
- Ocean Resources
- Oceanography
- People
- Scientific Equipment
- Vessels
This list was developed using the Thesaurus for Graphic Materials (TGM), using headings from TGM I and II. If TGM did not provide the Archivists with what they needed, a heading was made up (for example: TGM uses the term BOATS, which was considered too narrow, thus the term VESSELS was chosen). These fourteen categories (full LSTA thesaurus PDF) serve as a predefined search which can be used to query one collection or both simultaneously.
The metadata standards for this project rely on existing standards where applicable, including:
Type: Internet Media Types
http://www.isi.edu/in-notes/iana/assignments/media-types/media-types
Source Type: DCMI Type Vocabulary
http://dublincore.org/documents/dcmi-type-vocabulary/
Topside Location: Alexandria Digital Library Gazetteer
http://fat-albert.alexandria.ucsb.edu:8827/gazetteer/
Expedition Cruise Name:
_ GDC Cruise Index
http://gdcmp1.ucsd.edu/gdc/cruises/cruise.index
_ Phyllis Helm authority list
Vessel: Vessel name from SIO Archives authored authority list
_ ROGER authority file
_ UNOLS:
http://www.unols.org/images/ships/shipimages.html
Ocean Location: Grid number from 4th edition of International Hydrographic Organization Limits of Oceans and Seas
Underwater Features: GEBCO Gazetteer of Undersea Feature Names
http://www.ngdc.noaa.gov/mgg/gebco/underseafeatures.html
Subjects: Keywords from Library of Congress Subject Headings controlled vocabulary
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