Offering Ensemble products through WMS at Meteo-France Marie-Francoise Voidrot March 2015 Météo-France

Meteo-France WMS The current WMS service … … still uses WMS 1.1.1 … does not (yet) implement the OGC Met Ocean Best Practices on Time and Elevation We do not plan to give access to single Ensemble members through WMS Layers are based on graphical products of ECMWF’s “catalogues of products” We have many graphical products (expressed as layers) which are based on our Ensemble forecast

Five Ensemble-specific dimensions reference_isoline          (For spaghettis = enhanced isoline) <Dimension name="reference_isoline" units="kts"/> <Extent name="reference_isoline">30,40,50,60</Extent> quantile                         (Vakue of wanted quantile- between 0 et 100) <Dimension name="quantile" units="%"/> <Extent name="quantile">0,10,25,33,50,66,75,90,100</Extent> quantile_interval            (example 20-80) <Dimension name="quantile_interval" units="%"/> <Extent name="quantile_interval">0-100,10-90,20-80,25-75,33-66</Extent> probability_over_limit              (For probabilities over a value) <Dimension name="probability_below_limit" units="°C"/> <Extent name="probability_below_limit">-10,-5,0,5,10,15,20,25,30,35</Extent> probability_below_limit              (For probabilities under a value) <Dimension name="probability_over_limit" units="°C"/> <Extent name="probability_over_limit ">-10,-5,0,5,10,15,20,25,30,35</Extent>

+ two general dimensions process              (for model or ensemble name. Similar to process concept in O&M2.0 ) <Dimension name="process" units=“None"/> <Extent name="process">PEPS__0.5</Extent> reference_time_period  (for accumulation duration over a period – precipitations, snow…)             <Dimension name="reference_time_period" units="ISO8601Period"/> <Extent name="reference_time_period">PT1H,PT3H,PT6H,PT12H,PT24H,PT48H</Extent> 4

Syntax in the name of the layers Statistical process_Parameter_Type of Level QUANTILE                 QUANTILE__WS__HEIGHT <Name>QUANTILE__T__HEIGHT</Name> <Name>QUANTILE__PRECIP__GROUND</Name> <Name>QUANTILE__SNOW__GROUND</Name> <Name>QUANTILE__CAPE_INS__GROUND</Name> <Name>QUANTILE__T__GROUND</Name> <Name>QUANTILE__HU__ISOBARIC</Name> SPAGHETTIS             SPAGHETTIS__Z__ISOBARIC__500 <Name>SPAGHETTIS__GUST__HEIGHT</Name> <Name>SPAGHETTIS__Z__ISOBARIC__500</Name> <Name>SPAGHETTIS__SNOW__GROUND</Name> <Name>SPAGHETTIS__P__SEA</Name> <Name>SPAGHETTIS__PRECIP__GROUND</Name> <Name>SPAGHETTIS__Z__ISO_PV_1500</Name>   INTERQUANTILE     INTERQUANTILE__GUST__HEIGHT <Name>INTERQUANTILE__NEBUL__GROUND</Name> <Name>INTERQUANTILE__PRECIP__GROUND</Name> MINIMA <Name>MINIMA__P__SEA</Name>

Syntax in the name of the layers Statistical process_Parameter_Type of Level MEAN      exemple :     MEAN__Z__ISOBARIC <Name>MEAN__HU__ISOBARIC</Name> <Name>MEAN__CAPE_INS__GROUND</Name> <Name>MEAN__WS__ISO_TP_1500</Name> <Name>MEAN__Z__ISO_TP_1500</Name>  STDEV                         STDEV__P__SEA <Name>STDEV__WS__ISO_TP_1500</Name> <Name>STDEV__CAPE_INS__GROUND</Name> <Name>STDEV__T__HEIGHT</Name> <Name>STDEV__Z__ISO_TP_1500</Name> <Name>STDEV__T__ISOBARIC</Name>  PROBABILITY           PROBABILITY__PRECIP__GROUND <Name>PROBABILITY__T__HEIGHT</Name> <Name>PROBABILITY__WS__HEIGHT</Name> <Name>PROBABILITY__HU__HEIGHT</Name> <Name>PROBABILITY__PRECIP__GROUND</Name> <Name>PROBABILITY__HU__ISOBARIC</Name> <Name>PROBABILITY__TPW__ISOBARIC</Name> <Name>PROBABILITY__T__GROUND</Name>  

Getcapabilities GETCAPABILITIES : http://synthese1.meteo.fr:8080/public/api/ogc/wms/ensemble?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetCapabilities (2680 lines) 7

Request Examples and Plot http://syntone-preprod/public/api/ogc/wms/ensemble/?layers=SPAGHETTIS__P__SEA&width=250&styles=&srs=EPSG:4326&format=image/png&version=1.1.1&exceptions=application/vnd.ogc.se_inimage&time=2015-02-22T18:00:00Z&height=125&dim_process=PEARP__1.5&token=xxxx&bbox=-179.99,-89.99,179.99,89.99&dim_analysis_time=2015-02-18T18:00:00Z&request=GetMap&service=WMS&dim_reference_isoline=990&transparent=TRUE Spaghettis Mean Sea Level Pressure Isoline 990 hPa 8

Request Examples and Plot http://syntone-preprod/public/api/ogc/wms/ensemble/?dim_probability_sup=5&layers=PROBABILITY__PRECIP__GROUND&width=250&styles=&srs=EPSG:4326&format=image/png&version=1.1.1&exceptions=application/vnd.ogc.se_inimage&time=2015-02-21T18:00:00Z&height=125&dim_process=PEPS__0.5&token=XXXX&bbox=-179.9, -89.99, 179.89999999999995,89.99&request=GetMap&service=WMS&dim_reference_time_period=PT24H&transparent=TRUE Probability 24h-precipitations > 5 mm 9

Request Examples and Plot http://syntone-preprod/public/api/ogc/wms/ensemble/?layers=QUANTILE__FF_RAF__HEIGHT&width=250&styles=&srs=EPSG:4326&format=image/png&version=1.1.1&exceptions=application/vnd.ogc.se_inimage&height=125&dim_process=PEARP__0.5&token=XXXX&dim_quantile=75&bbox=-179.99,-89.99,179.99,89.99&request=GetMap&service=WMS&transparent=TRUE Quantile 90 Windgust 10

Pros / Cons Pros : Simple Flexible Usable whichever number of members into the Ensemble and the clients doesn’t need to know the ensemble size Reasonable size for the Getcapabilities Cons : Valid for post processed value added statistical layers not for the selection of specific members or group of members into the raw outputs. Semantics into the layer name even if minimal An operational implementation used since Mid 2014 11