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

2. 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

3. 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>

4. + 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

5. 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>

6. 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>

7. Getcapabilities GETCAPABILITIES :
(2680 lines) 7

8. Request Examples and Plot
Spaghettis
Mean Sea Level Pressure
Isoline 990 hPa 8

9. Request Examples and Plot
, ,89.99&request=GetMap&service=WMS&dim_reference_time_period=PT24H&transparent=TRUE
Probability
24h-precipitations > 5 mm 9

10. Request Examples and Plot
Quantile 90 Windgust 10

11. 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