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CDDIS Bulletin - February 1990
Volume 5 No. 3
In this issue:
On the cover: Global PRARE
Site Locations
A major responsibility of the CDDIS is the collection and archive
of SLR data from stations located worldwide. During the past year,
the Deutsches Geodatisches Forschungsinstitut (DGFI) in West Germany
has acted as the initial collection center for the European laser
stations (Grasse, Graz, RGO, Wettzell, Zimmerwald, Metsahovi, MTLRS-1,
and MTLRS-2). In addition, DGFI receives data from many of the INTERCOSMOS
SLR stations (Borowiec, Katzively, Santiago de Cuba, Potsdam, and
Riga) and sends this data to the CDDIS. Lastly, the CDDIS receives
other data sets (e.g., Shanghai, Simosato, HTLRS, and Helwan) from
the sources themselves. Upon their arrival, these various data sets
are summarized to ensure that the MERIT II format, site occupation
designators, etc. are correct. This validated tape is then sent to
the Bendix Data Services Group, typically on a monthly basis, for
merging with the GLTN monthly releases. The table on
the page 3 details the current status of CFLN (cooperating foreign
laser network) data for 1989 received thus far. The shading indicates
the version (A, B, C, etc.) of the Bendix release tape that contained
the data; a slash through the box indicates that the Bendix version
of the data has been released to the CDDIS and the SLR user community.
The data merging effort of DGFI has led to a considerable increase
in the amount of data that is now released on the monthly A version,
thus providing the users with more data on a timely basis. However,
it is still very important that all SLR observing stations submit
their data to DGFI and the CDDIS on a timely basis. The CDDIS and
the SLR community strongly encourages the data producers to submit
their data to DGFI or the CDDIS as soon as possible. This effort
will allow Bendix to process the data and include it in the earliest
possible data release.
This section is designed to give brief notices of special events
or problems encountered in recent months.
As reported in previous issues of the DIS Bulletin, the Bendix
Data Services group has continued the generation of test sets of
SLR normal points. To date, the CDDIS now has normal point data produced
from the B version of the January through March, 1989 full-rate data
as well as those data sets produced from the A version of the April
through July, 1989 full-rate data. The entire set of 1988 normal
points generated from the latest versions of full-rate data are also
available in the CDDIS.
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