Upon arrival on the vessel, Chief Scientists shall meet with the Chief Science Officer and the Data Manager to discuss the NSF and Langseth data policies. Before departing the vessel, the Chief Scientist will meet again with the Data Manager and sign a data release authorization, which authorizes LDEO to transmit and submit the raw cruise data on their behalf. At this time, certain data sets may be marked for early release. Langseth does not routinely collect non-digital data (e.g. water samples, cores) during seismic operations. Should non-digital data be collected, it will be the responsibility of the Chief Scientist to arrange to have the samples removed from the vessel at the end of the cruise and ensure that NSF archiving requirements are met.
All data acquired from Langseth sensors flows to the central Langseth fileserver (fserve), where they are stored in a cruise-specific network share, called the ‘cruise directory’. All cruise documentation, log files, and records are also stored there. Shipboard researchers can access the cruise directory using a CIFS network share (standard Windows file sharing). Langseth technical staff will assist users in accessing the cruise directory. Access to the raw data is read-only, but writable areas are available for users to store documents and files. Users are encouraged to store any cruise-related materials (except seismic processing files) in the cruise directory. Users are also encouraged to load data from non-Langseth (i.e., client-provided) instruments in the cruise directory, also.
Multi-channel seismic shot data is recorded directly to RAID disk and is backed up on the central fileserver under a different share, called the ‘SEGD directory’.
Note that all shipboard researchers are provided credentials to access the cruise directory and SEGD directory. After the cruise is completed, these directories are archived and are not available to subsequent users. During the cruise, however, all cruise participants have access to all current data. If there are specific data security concerns, these MUST be identified before the cruise.
Toward the end of the cruise (usually the day of arrival), the technical staff will close the cruise directory and no further additions will be possible. Sufficient notice will be made to users to allow completion of work.
Distribution and Transport
Data are logged until arrival at the pier. The data distribution will be finalized the day of arrival and will be ready for packaging the morning after arrival.
The technical staff will provide one set of data copies, including all raw underway digital data to the PI on portable hard drives. Further copies can be made by the PI from these hard drives. The seismic data is made available to scientists via network share, either NFS or CIFS.
If a gravity tie can be completed before the cruise directory is closed out, the gravity tie records will be stored on the cruise directory, including gravimeter data up to and through the gravity tie. If a gravity tie cannot be completed, a gravity addendum will be compiled and made available to scientists at a later date.
Archive and Release
Per NSF policy, all data collected must be made available to the public within two years of collection. NSF has funded several programs to archive and disseminate research data.
Underway Sensor Data
Underway data acquired routinely with the ship's installed sensors (e.g. multibeam, subbottom profiler, ADCP, MET sensors) are submitted to the NSF funded ‘Rolling Deck to Repository
’ (R2R) program. The R2R program is a data clearinghouse which receives raw data from all UNOLS vessels, provides basic data documentation and routine quality assessment, and ensures submission to the appropriate NOAA data center (the National Geophysical Data Center or National Oceanographic Data Center) for long-term archiving and distribution.
At completion of the cruise, the technical staff will submit the contents of the cruise directory to R2R.
Multi-Channel Seismic Shot Data
All multi-channel seismic field data collected aboard the Langseth
are archived with the NSF-supported Academic Seismic Portal at LDEO
of the IEDA Marine Geoscience Data System
(MGDS). Multi-channel seismic data from most academic surveys conducted with the R/V Ewing
are also available, as well as data from a number of earlier programs of the R/V Conrad
and R/V Vema
At completion of each cruise, the technical staff submit the contents of the SEGD directory as well as all seismic logs and seismic navigation data to the MGDS. The Chief Scientist may request data be made public immediately, however a proprietary hold of 2 years is customary.
All OBS data are archived through the IRIS Data Management Center
(DMC) and are submitted to the DMC by OBS Instrument Pool (OBSIP) personnel. Founded in 1984 with support from the National Science Foundation, IRIS (Incorporated Research Institute for Seismology
) is a consortium of over 100 U.S. universities dedicated to the operation of science facilities for the acquisition, management, and distribution of seismological data.
Science Party Instruments and Processed Data Created at Sea
Langseth technical staff do not routinely handle the submission of any data acquired with science party instrumentation or created by on-board processing. For example, if the science party processes multibeam bathymetry data during the cruise, that processed data will not be included with the data package submitted by the technical staff to R2R or MGDS. However, these data can be included in the archive submission if the science party makes arrangements for this at the end of the cruise.
Processed seismic data
Processed seismic data (e.g. stacked and migrated sections) from Langseth
programs are archived at the Academic Seismic Portal at UTIG
and are accessible by links from MGDS. Submission of processed data sets are the responsibility of scientists, in accordance with the requirements of the funding agency supporting their studies.