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Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 The GEONETCast Alert Channel and CAP over GTS Simon Elliott.

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Presentation on theme: "Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 The GEONETCast Alert Channel and CAP over GTS Simon Elliott."— Presentation transcript:

1 Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 The GEONETCast Alert Channel and CAP over GTS Simon Elliott EUMETSAT

2 Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 Distribution of satellite products EUMETSAT operates meteorological satellites Satellite data are processed to derive a range of products (images, radiance data, wind information, soil moisture, fire detection, etc.) Products are produced operationally in near real time in a variety of formats BUFR - GRIB - JPEG - ASCII - netCDF - HDF

3 Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 Distribution mechanisms Several mechanisms are used to distribute satellite products EUMETCast/GEONETCast –Satellite DVB-S multi-cast service –Easy access, many users, almost global coverage Global Telecommunication System, GTS –Global network connecting NMHSs –Limited access, highly controlled, well established Website access Archive access

4 Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 Volcanic Ash Detection Infrared image data from METEOSAT are processed to detect the presence of volcanic ash Products could be: –GRIB or BUFR encoded for NWP community –Graphically represented (e.g. JPEG) for Volcanic Ash Advisory Centre (VAAC) or internet presentation –Described with a plain text bulletin or in XML CAP can be used to encapsulate these formats

5 Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 Volcanic Ash on EUMETCast CAP message Style sheet reference Graphics Text CAP message contains standard information supplemented by hyperlinks to associated information

6 Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 Sample web page containing a volcanic ash CAP message Display is style sheet dependent

7 Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 GEONETCast Overview EUMETCast Network Centre FENGYUNCast Network Centre GEONETCast Americas Network Centre EUMETCast Users EUMETCast Data Providers FENGYUNCast Users FENGYUNCast Data Providers GEONETCast Americas Data Providers GEONETCast Americas Users Data exchange

8 Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 GEONETCast Coverage

9 Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 GEONETCast Alert Channel GEONETCast Americas has an alert channel EUMETCast is EUMETSATs component of GEONETCast EUMETCast currently has a virtual alert channel (part of product channel) In next couple of months dedicated EUMETCast alert channel will be enabled EUMETSAT uses CAP for some of its own products. The MSG Fire Detection and Volcanic Ash products are created using CAP

10 Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 Channel Based Dissemination Each product/product category is assigned to a dedicated multicast channel on GEONETCast such as RA-VI BMD, Training Channel, Info Channel, Data Channel 1-4 etc. … and Alert Channel Each channel uses either a dedicated or shared bandwidth for dissemination Priorities are assigned depending on delivery needs User groups can be assigned to each channel (access control supported)

11 Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 Dedicated Alert Channel Dedicated bandwidth Channel is kept free of any other data then alerts Channel is setup for high priority and immediate dissemination Data exchange to the partner GNCs NRT availability of CAP alerts simultaneously on the entire footprint

12 Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 GEONETCast Alert Channel GEONETCast Network Centre Partner Network Centre GEONETCast Users Reception Station ALERT Provider e.g. GISC, DCPC, NC, Others Data exchange CAP Alerts Internet Users Normal data High priority NRT- Dissemination of CAP Alert Messages Portal (Product Navigator) Multicast NRT Dissemination -Recognises incoming CAP alert file -Raises alert -CAP Alert stored in WEB portal for Internet retrievals - can discover and subscribe to CAP alerts -High priority processing and NRT dissemination on dedicated channel -On reception of a CAP alert the GNC decodes the alert to distinguish if the alert is for global exchange or regional GNC Reference Reception Station - feedback of CAP alert reception for SLA monitoring - regular transmission of empty alerts in order to check the status of the channel

13 Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 The Global Telecommunication System

14 Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 Volcanic Ash on GTS CAP message Style sheet reference GTS wrapper CAP message Style sheet reference CAP message Style sheet reference EUMETSATNWP Centre CAP message in XML is wrapped with routing information for the GTS. The wrapper is removed after transfer to the destination to restore the original message.

15 Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 Wrapping of CAP for GTS EUM.MET09.VASH.1... \r\n\rnnn\r\r\n[ABH]\r\r\n EUM.MET09.VASH.1... \r\r\n

16 Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 Abbreviated Bulletin Headers for CAP ABHs have the form For volcanic ash data in CAP, this could be: T 1 = X [Common Alerting Protocol (CAP)] T 2 = V [Volcanic ash clouds (SIGMET)] or O [Other] A 1 A 2 = NT [North Atlantic area, case dependent] ii = 01 [Essential data as per WMO Resn. 40] CCCC = EUMG [EUMETSAT/MSG] YYGGgg = [date & time, case dependent] Several choices of T 1 T 2 have been considered, including WV, FX, WX, XW, XO and WO. It is important that the data are not confused for an existing product. The most recent suggestion, after consultation with, among others, ICAO is T 1 T 2 = XO.

17 Common Alerting Protocol (CAP) Implementation Workshop Geneva, Switzerland, 6-7 April 2011 Conclusion The intrinsic standardisation of CAP ensures syntactic and semantic interoperability of the data Dissemination of volcanic ash products using CAP on the GTS and via EUMETCast/GEONETCast allows one product to meet the requirements of different groups of users CAP messages can supply the GTS community with information which can be understood and used in a variety of applications and disciplines


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