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Proceedings of The National Conference On Undergraduate Research (NCUR) 2007

Summary: Proceedings of The National Conference
On Undergraduate Research (NCUR) 2007
Dominican University of California
San Rafael, California
April 12 14, 2007
An Ontological Scheme for Specifying Time in HDF5
Ana Elena Buleu
Electrical Engineering Department, Center for Computation and Technology
Louisiana State University
Baton Rouge, LA 70803
Faculty Advisor: Dr. Gabrielle Allen
Research Advisors: Dr. Werner Benger, Ms. Shalini Venkataraman
Hierarchical Data Format (HDF5) is a file format and an I/O library whose main strengths are a hierarchical
structure, multidimensional datasets, hyperslab operations, exchangeable virtual file driver, automatic type
conversions, user-definable structure types and named datatypes. At CCT, we use HDF5 as a data storage medium
for large-scale scientific simulation codes (e.g. Cactus), and visualization of diverse datasets.
One open issue encountered in dealing with HDF5 is time storage. When dealing with scientific data, time is
frequently a single numerical value, an amount of time units, but not a calendar date. There is no specific manner of
storing time this way in HDF5, and we use instead a floating-point number. There are many accuracy drawbacks to


Source: Allen, Gabrielle - Department of Computer Science, Louisiana State University


Collections: Computer Technologies and Information Sciences