SADISOPSG/14-IP/13
2//6/09
SATELLITE DISTRIBUTION SYSTEM OPERATIONS GROUP (SADISOPSG)
FOURTEENTH MEETING
Bangkok, Thailand, 15 to 17 July 2009
Agenda Item 6: Development of the SADIS
6.1: Report of the SADISOPSG Gateway Development Team
ISSUES RELATED TO HARMONIZATION OF SADIS AND ISCS OPMET
(Presented by the ISCS Provider State)
SUMMARY
This paper highlights the latest efforts to harmonize ISCS and SADIS. ISCS is
now using the SUG Annex 1 as the requirements baseline for all OPMET data.
1.
INTRODUCTION
1.1
Since last years meeting, the international satellite communications system (ISCS)
provider state has made several changes to the ISCS data-stream with respect to the operational
meteorological (OPMET) database. First was eliminating unnecessary re-compilation of aerodrome
forecasts (in meteorological code form) (TAFs) and aerodrome routine meteorological reports
(in meteorological code form) (METARs) collectives. Another was to use the SUG Annex 1 as the
requirements builder for the US OPMET data collectives. Lack of resources hindered getting these
changes finished earlier.
2.
DISCUSSION
2.1
The main reason for the non-uniformity of the two Satellite forecasts was in how the two
providers issued OPMET collectives. The satellite distribution system for information relating to air
navigation (SADIS) provider uses the originating World Meteorological Organization (WMO) bulletin to
include the originating states CCCC where possible. ISCS on the other hand rebuilds other states
collectives, and re-issues them under the CCCC of KWBC. This procedure by ISCS was updated late last
year. Now METAR/TAF collectives broadcast over ISCS follow the same format as SADIS. The result
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should be reflected in identical collectives by each provider. For example if a state sends a collective with
OPMET data defined in SUG Annex 1, it should appear in both satellite broadcasts.
2.2
Until recently, the ISCS broadcast collectives did not meet aeronautical fixed
telecommunication network (AFTN) requirements for character length unless segmentation was used.
This compelled SADIS to rebuild these collectives under the EGGY CCCC. To remove the segmentation
issue, ISCS added ten new collectives to meet the AFTN 1800 character limit for TAFs/METARs.
These collectives will begin to flow over the ISCS broadcast in or around June of 2009. It should be noted
that these collectives are driven by the most recent SUG Annex 1, and are listed below.
TAFs
FTUS71…Eastern US
FTUS72…Southern US to include San Juan
FTUS73…Central US
FTUS74…Western US
FTUS75…Pacific and Alaska
METARs
SAUS71…Eastern US
SAUS72…Southern US to include San Juan
SAUS73…Central US
SAUS74…Western US
SAUS75…Pacific and Alaska
SPUS71…Eastern US
SPUS72…Southern US to include San Juan
SPUS73…Central US
SPUS74…Western US
SPUS75…Pacific and Alaska
2.3
It should be noted that users of the world area forecast centre (WAFC) workstations
received updates discussing the changes mentioned above. Also the ISCS Program Manager welcomes
input from States to identify collectives that are missing on the broadcast.
3.
3.1
ACTION BY THE SADISOPSG
The group is invited to note the information contained in this paper.
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