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Shipments By Program
(all methods)
through December 31, 2007
gigabytes shipped
30,000.00
25,000.00
20,000.00
15,000.00
10,000.00
2007
2006
2005
2004
2003
2002
5,000.00
0.00
GSN PASSCAL DMS (Other) USArray
(TA,BK,CI)
Figure 32. Data volume distributed by the DMC for GSN,
PASSCAL, other DMC sources, and for the major components
of the EarthScope Transportable Array. These statistics have
been compiled since 2002 and are updated monthly by the
DMC.
upon the HDF-5 format that allows better management of
and access to SEGY data, the standard archive format for
controlled-source data. PASSCAL electronically transfers
HDF-5 files to a specific directory on a DMC machine.
Scripts at the DMC produce Web forms that allow users to
view details about shot points and sensor locations from
which they can determine what data can be requested.
The motivation to develop this PASSCAL-DMS Web form
was to simplify data curation, specifically in the area of
separating metadata from waveform data. This structure
reduces the data-processing burden on PIs as they uncover
errors in the metadata; they no longer have to rewrite an
entire data set, but instead simply correct the metadata. This
development has also produced a new request tool where the
IRIS DMC is better able to service the community’s requests
for this type of data.
The new system to support SEGY data was developed by
PASSCAL staff and allowed DMC staff to focus on the development
of the Web components of the system. Although
this new system has not yet been officially released, it is well
developed and will improve distribution and support for
SEGY data sets to the broad community.
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