The End of Zero-Hit Queries: Query Previews for NASA's Global Change Master Directory

dc.contributor.authorGreene, Stephanen_US
dc.contributor.authorTanin, Egemenen_US
dc.contributor.authorPlaisant, Catherineen_US
dc.contributor.authorShneiderman, Benen_US
dc.contributor.authorOlsen, Lolaen_US
dc.contributor.authorMajor, Geneen_US
dc.contributor.authorJohns, Steveen_US
dc.description.abstractThe Human-Computer Interaction Laboratory (HCIL) of the University of Maryland and NASA have collaborated over the last three years to refine and apply user interface research concepts developed at HCIL in order to improve the usability of NASA data services. The research focused on dynamic query user interfaces, visualization, and overview +preview designs. An operational prototype, using query previews, was implemented with NASA's Global Change Master Directory (GCMD), a directory service for earth science data sets. Users can see the histogram of the data distribution over several attributes and choose among attribute values. A result bar shows the cardinality of the result set, thereby preventing users from submitting queries that would have zero hits. Our experience confirmed the importance of metadata accuracy and completeness. The query preview interfaces make visible problems or holes in the metadata that are unnoticeable with classic form fill-in interfaces. This could be seen as a problem, but we think that it will have a long-term beneficial effect on the quality of the metadata as data providers will be compelled to produce more complete and accurate metadata. The adaptation of the research prototype to the NASA data required revised data structures and algorithms. (Also cross-referenced as UMIACS-TR-97-84)en_US
dc.format.extent5881554 bytes
dc.relation.isAvailableAtDigital Repository at the University of Marylanden_US
dc.relation.isAvailableAtUniversity of Maryland (College Park, Md.)en_US
dc.relation.isAvailableAtTech Reports in Computer Science and Engineeringen_US
dc.relation.isAvailableAtUMIACS Technical Reportsen_US
dc.relation.ispartofseriesUM Computer Science Department; CS-TR-3856en_US
dc.relation.ispartofseriesUMIACS; UMIACS-TR-97-84en_US
dc.titleThe End of Zero-Hit Queries: Query Previews for NASA's Global Change Master Directoryen_US
dc.typeTechnical Reporten_US
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