NASAThes_NKOS_053103.ppt
Transcript of NASAThes_NKOS_053103.ppt
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Using the NASA Thesaurus to Support the Indexing of
Streaming MediaGail Hodge
Information International Associates, Inc.
Janet Ormes & Patrick HealeyNASA Goddard Space Flight Center Library
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Historic Context • The Library has collected and circulated the
Center’s colloquia on audio or video since 1967• A catalog of these holdings have been posted on
the Library’s web site since 2001• Patrons required to come to the Library, resulting
in limited accessibility of recorded colloquia • Streaming Media Center Project began in 2001 as
part of the Library’s response to Knowledge Management initiatives
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Streaming Media • Streaming media
– Video that is encoded for delivery across the internet/intranet
• Encoding – Computer processing of video to a format for web
casting • Web casting
– The act of delivering audio and video content across the internet/intranet
– Can be delivered live or on-demand
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The Goddard Library Streaming Media Center
• The Streaming Media Center is now available from the Library website (http://library.gsfc.nasa.gov)
• Can be included in personalized portals • Library has collected >350 hours of video
– >100 hours indexed
• Currently broadcasting 2 hours daily for the Earth Observing Systems Knowledge Management Pilot
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Access Issues • Current Needs
– Need to know the overall topic of the video
– More likely to remember the topic, presenter, date or series
• Permanent Access– Less likely that users will remember the video’s
metadata
– More likely that users will want specific information
– Terminology may change over time
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Indexing Video Content
• Video indexing is similar to a back-of-the book index for specific information
• Entering a keyword leads you to the specific location of the subject
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Features of Selected Software• Compares recognized speech with stored
default terminology
• Uses speaker inflection to identify meaningful intervals
• Indexing and Search components included
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Incorporation of NASA Thesaurus
• Added specific scientific terminology • Incorporated terms and their NTs, RTs and
UF/USE relationships • Used text of Astrophysics Data System to provide
terms in grammatical structures• Provides query expansion and improves relevancy
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Query Expansion“Saturn Moons”
+ Ios+ Triton
Or“Scatha Satellite”
+ P78-2 Satellite
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Query Expansion (Illustrated)
Sample Search (aurora) on same one hour lecture entitled “Jupiter’s Aurora”. One file was indexed using the NASA thesaurus, the other was indexed using a more basic scientific word list.
GREATER overall relevance understanding
Ignores IRRELEVANT content (Speech Recognition Error)
MORE relevant content found (2M+ VS 20 Sec’s)
Benefits
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Relevance Interval Creation• Relevance Interval Creation links related
concepts within media files, which drives Relevance Intervals
• External knowledge from the thesaurus improves the accuracy of the Creation process because the explicit knowledge in text is incomplete
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Relevance Interval (Illustrated)
Sample Search (aurora) on same one hour lecture entitled “Jupiter’s Aurora”. One file was indexed using the NASA thesaurus, the other was indexed using a more basic scientific word list.
GREATER overall relevance understanding
Ignores IRRELEVANT content (Speech Recognition Error)
MORE relevant content found (2M+ VS 20 Sec’s)
Benefits
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Benefits• Identify relevant pieces of content within a
longer video• Stream more relevant, specific information
intervals to users• Minimize manual processing• Ultimately improve reuse of information
and increase opportunities for knowledge sharing