Exploiting Web Services for Meteorological Applications

2nd Workshop on the Use of GIS/OGC standards in Meteorology, 23rd-25th Nov 2009, Toulouse, France

Exploiting Web Services for Exploiting Web Services for Meteorological ApplicationsMeteorological Applications

Jozef MatulaJozef [email protected]@iblsoft.com

IBL Software EngineeringIBL Software Engineering


OutlineOutline

• What we do…

• Building forecasting application – what protocols/formats to use?

• IBL’s contribution to future MetOceanDWG interoperability experiments.

• My goal is…

…to get the REAL meteorological forecasting tool into my boss’ iPhone!


WHAT WE DO...WHAT WE DO...


What is IBL Visual Weather?What is IBL Visual Weather?

• Strategic Weather Information Forecasting Tool – UK Met Office project for workstation upgrade

• Visual Weather = Meteorological Workstation SW:– Met. data processing and visualisation– Interactive forecasting tools– Forecast production and workflow

management– Batch production– Extensibility with Python API– Web services (WMS, WCS, WFS, JMBL, Python)

• Everything in one box or Client-Server• Highly configurable and integration-capable


OGC Web Services in Visual WeatherOGC Web Services in Visual Weather


Python Web Services in Visual Python Web Services in Visual WeatherWeather

• Use of Visual Weather’s Python API together with scripting allow rapid development and instant deployment of web services in mod_python style

import IBL.Kernel; from IBL.Net import apache

def getTemperature(req, station):

e = K.Expression( "@station v6[5,2] Fsynop_latest$sv52$C")

e.setArgument("station", K.mkStation(station))

tSYNOP = e.eval()

req.write(str(tSYNOP["temperature"].

toValue(K.u.T_CELS)))

return apache.OK

http://my-server/service/getTemperature?station=LZIB


The missing pieceThe missing piece


COMMON REQUIREMENTSCOMMON REQUIREMENTS

We decided to build a web 2.0 based forecasting workstation but what are the

http://www.projectcartoon.com/cartoon/63775


Decomposition of the met applicationDecomposition of the met application


How to meet requirements? (1)How to meet requirements? (1)

Synoptic map• Approx. 1500

observations in Europe (hourly)

• About 20 parameters needed

• WMS 100kB PNG• SOS/WFS 3MB GML:

– how to get time axis?

– complicated visualisation

• WCS ?

Miranda IM.lnk


How to meet requirements? (2)How to meet requirements? (2)Isolines from NWP

data• WMS this works –

tens of kBs.• WFS isoline could be

considered as feature• WCS

– Size effective output formats are hardly usable by simple clients

– Isolines algorithm is rather complicated.



Meteograms & Cross-sections (graphs)

• WMS non-geospat. CRS

• SOS/WFS – tens of kB of GML

data– complexity of

visualisation depends on used client platform abilities

• WCS ?



Thermodiagram (profile)• Single site• >5 parameters needed• WMS non-geospat.

CRS• SOS/WFS 10kB GML +

little bit of processing• WCS ?

– NWP profiles need hundreds MB of gridded data

• Size of image is approx. size of GML data.

Miranda IM.lnk



Weather features• Single site• Tens of feature types

(single point or smooth polylines, text, areas)

• WMS Read only• WFS small GML, but

complicated visualisation.

• WCS no


THERE ARE MULTIPLE WAYSTHERE ARE MULTIPLE WAYSTo open a can


Very simple conclusionsVery simple conclusions


Dummy MAPsDummy MAPs in in the the Web Web MAP MAP ServiceService

• Map is ONLY a picture so once you get a picture you usually loose:– Metadata – you don’t know what you got -

(time, content description, etc.)– Spatial localisation – (except formats like

GeoTIFF, JPEG2000)

• Map is a picture, that’s why anyone can work with it simply.

• Reference system of the image is CRS:1!


Pushing WMS behind its limits (1)Pushing WMS behind its limits (1)

TIME ISO8601DIM_RUN ISO8601DIM_FORECAST ISO8601 Duration or +XELEVATION Vertical level with unitDIM_STATION WMO station numberDIM_PLACE Place of time cross-section/meteogram: DIM_PLACE=EPSG:4326[1.5;43.7] DIM_PLACE=EPSG:54004[18627e3;4990e3] Horizontal route (space separated): DIM_PLACE=LZIB EPSG:4326[1;43] EHAM


GetMap with TIME dimension

HTML GetFeatureInfo with TIME

HTML empedded <img> GetMap with TIME & DIM_STATION



...&REQUEST=GetMap&CRS=CRS:1&BBOX=0,0,639,479&...



<Dimension name="PLACE“ units="CoordinateOrStationIdList“ default="LZIB EDDF"> LZIB EDDF, CRS:84[0;0] EPSG:4326[1e4;2.0e5]</Dimension>

There is infinite number of possible values for this dimension!



...&REQUEST=GetMap&CRS=IBL:SKEWT&BBOX=0,0,1,1&...


HOW WE PUT EVERYTHING HOW WE PUT EVERYTHING TOGETHERTOGETHER

Finally to get closer to what my boss wanted or...


Decisions madeDecisions made


““Flexi Weather”Flexi Weather”


Future of Flexi WeatherFuture of Flexi Weather


IBL’s Contribution to MetOcean DWGIBL’s Contribution to MetOcean DWG


Thank youThank youfor your attention!for your attention!

Questions?Questions?

Thank youThank youfor your attention!for your attention!

Questions?Questions?

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Exploiting Web Services for Meteorological Applications

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