About GTSPP Best Copy Files
The GTSPP Long-Term Archive, operated by US NODC, holds, in the beginning,
the real-time data from ISDM received three times per week. Delayed
mode data include the full resolution data from XBTs or CTDs from
the ships, or fully processed and quality controlled data from the
organizations that provided the real time low resolution data to
the GTS. If a low resolution real time copy of the data are already
in the CMD the better quality or higher resolution copy replaces
the real time one as the best copy. The best copy data files are
assembled to provide the most complete data sets without duplication
and comprise the best temperature and salinity stations for each
month for which data is available in the data base, from either real-time
(BATHY or TESAC) data, or delayed mode, full resolution profiles
of (PI-submitted) XBT and CTD data. Where matching stations are found,
the delayed mode, full resolution profile is included and the real-time,
lower resolution profile is excluded, to make it the "best copy" available.