On behalf of the International Civil Aviation Organization (ICAO), we have developed and operate SADIS.
What is SADIS?
SADIS is provided on behalf of, and under the oversight of the International Civil Aviation Organization (ICAO).
Its purpose is to make available meteorological data for international air navigation as specified in ICAO Annex 3 - Meteorological Service for International Air Navigation; and as described in the Regional Air Navigation Plans for the ICAO European, African, Middle East, North Atlantic, and Asia Pacific regions.
SADIS FTP is a data library. It does not process/visualise data. It makes data available for extraction, processing and/or visualisation by end user systems.
Data available via SADIS
SADIS delivers World Area Forecast System (WAFS) products in digital format (BUFR and GRIB), PNG chart format, and alphanumeric formats, as well as other character-orientated OpMEt information required for pre-flight planning and flight documentation.
- WAFS gridded upper air forecasts in GRIB2 format
- WAFS significant weather (SIGWX) forecasts in BUFR format
- WAFS SIGWX forecasts in PNG format
- METAR in alphanumeric format
- SPECI in alphanumeric format
- TAF in alphanumeric format
- SIGMET in alphanumeric format
- AIRMET in alphanumeric format (where specified as required in regional Air Navigation Plans)
- GAMET in alphanumeric format (where specified as required in regional Air Navigation Plans)
- VAA in alphanumeric format VAG in PNG format
- TCA in alphanumeric format TCG in PNG format (where available)
- Space Weather Gorecats in alphanumeric format
Note: IWXXM format OpMEt information will be added in November 2020.
How to access SADIS?
All users of SADIS must have the prior and ongoing approval of the relevant State Meteorological Authority. You can get the contact details of the correct State Meteorological Authority from Aeronautical Information Publications (AIP) or the ICAO Directory of National Civil Aviation Administrations (DGCA). Please note, if a State withdraws its approval, then access to SADIS FTP will be terminated.
Register your interest by emailing the SADIS Manager.
How much does SADIS cost?
The provision of SADIS is funded through cost recovery. With the exception of States that are defined by the United Nations as Least Developed Countries (LDC), all user States (that is, any State that has users accessing SADIS from within its borders), are required to contribute to the costs of the service. The cost payable by each State is calculated annually by ICAO through the SADIS Cost Recovery Administrative Group (SCRAG). The precise mechanism and responsibilities of parties are described in the SADIS Agreement.
All reports relating to the calculations of amounts due from each contributing State are available on the ICAO website. The calculations are agreed in November, and are usually published in December of any given year. Invoices are issued in January of the following year. It should be noted that States are responsible for payment of SADIS invoices, not individual users.
It is a fundamental principle that all data distributed via SADIS must be agreed by the formal ICAO groups responsible for SADIS. Specifically, SADIS is tasked to make available data as specified in ICAO Annex 3. Supplementary data not covered under Annex 3 may be available when authorised by the relevant ICAO group overseeing SADIS.
Groups with oversight of SADIS day-to-day operational matters, working under the authority of the Meteorological Panel (METP):
- the Meteorological Operations Group (WG-MOG)
- the Meteorological Information Exchange Group (WG-MIE)
- the Meteorological Information and Service Development (WG-MISD)
- the Meteorological Requirements and Integration (WG-MRI)
SADIS workstations and software
Individual SADIS users will be required to procure and fund the necessary computer workstations/servers and software; internet connections; and ongoing support and maintenance.
Authorized SADIS users wishing to develop their own software to extract, process and/or visualize data from SADIS are invited to follow the criteria specified in the SADIS Fourth Round Evaluation Criteria. It will be necessary for programmers to have familiarity with:
- FTP protocols
- digital certificate protocols
- World Meteorological Organization (WMO) coding protocols
- WMO FTP concatenation processes
- WMO Manual on Codes (306), in particular BUFR and GRIB specifications
Please refer to the guidance documentation.
The SADIS provider is able to assist in the evaluation of software and systems (chargeable) if required. The evaluations will check the high level functionality and display of the different data sets that are provided on SADIS. If interested, please email the SADIS manager.
Backup to SADIS
SADIS FTP has proved a very reliable service with an extremely high level of availability for many years. Nonetheless, it is recognised that in the very unlikely event of a problem, a contingency data feed would be required.
Approved users of SADIS FTP are encouraged to contact the WIFS (WAFS Internet File Service) administered by the USA to set up a WIFS account for contingency purposes. Please note that certain restrictions may apply.
The policies agreed with ICAO and the USA are set out in Appendices B, C and D of the SADIS user guide.
The responsibility for requesting a contingency account with WIFS rests solely with the user.
How do I report a problem with SADIS?
In the first instance, check to see if you have received any SADIS administrative messages (NOUK10). These are used to inform users of operational matters relating to the service.
Users can request that SADIS administrative messages are also sent to their email address.
If the problem you are experiencing is not identified in a SADIS administrative message, please contact us.