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Author: Francesco Bartoli1
Geospatial engine for sharing meteorological objects Powered by GeoServer
GeobeyondMay 23, 2012
Author: Francesco Bartoli
Agenda What is WOML? GeoServer, a geospatial engine server
for consuming data GML application schema extension PostGIS, a spatial database for WOML Challenges
May 23, 20122
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WOML
May 23, 2012
Author: Francesco Bartoli
Weather Objects Modeling Language Semantically paradigm for meteorological
entities (Fronts, Cloud Areas, Precipitation Areas, etc)
Standard for data exchange of high-level meteorological phenomena among expertise-less stakeholders
Focused on interoperability, no expectations to data presentation
Started from FMI in late 2008
Author: Francesco Bartoli
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WOML Schemas Specification maintained at FMI
confluence GML application schema Based on top of GML 3.2.1 (latest
version) Inheritance as mechanism for
specialisation 4 Namespaces 25 Features
May 23, 2012
WOML Core
WOML SWO
WOML Quantit
y
WOML Textfct
Author: Francesco Bartoli
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WOML Core Building block for Geometry Point Line Surface
May 23, 2012
Author: Francesco Bartoli
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Core Feature Types All derived from gml:DynamicFeatureType to
describe changes while a forecast period is observed gml:history property to capture changes over the
period collected as geometrically-event objects PointObjectEventType, LineObjectEventType,
SurfaceObjectEventType All of them extend gml:AbstractTimeSliceType by
adding the geometry property is changing Feature Collection Type (certain area, timeframe)
WeatherForecastType MeteorologicalAnalysisType
May 23, 2012
Author: Francesco Bartoli
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Core Diagram
May 23, 2012
Author: Francesco Bartoli
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WOML SWO
May 23, 2012
Sensible Weather Object types: 14 of single point geometry inherited from
Core AbstractPointObjectType 9 of line geometry inherited from Core
AbstractLineObjectType 2 of surface geometry inherited from Core
AbstractSurfaceObjectType Example: A Ridge semantically differs
from a ColdFront despite they share the same properties
Author: Francesco Bartoli
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SWO Diagram
May 23, 2012
Author: Francesco Bartoli
10
WOML Quantity & Textfct
May 23, 2012
The Quantity namespace is defined for locations and areas with relevant physical values (Temperatures, wind speed, wind direction, etc) Easier replacement of OGC Observations &
Measurement for forecast and analysis The Textfct namespace describes text-based
weather forecasts for specific target areas Focused on lightweight exchange of data Forecast which needs human explanation
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Key Concepts
May 23, 2012
Autore: Francesco Bartoli
Geographical nature of meteorological data
Geospatial standards OGC WxS Cross-boarder cooperation and
harmonisation of data (Regional – National – European)
Interoperability in mind Consuming data from WOML WFS 2.0
Author: Francesco Bartoli
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GeoServer
May 23, 2012
Supports OGC WxS family implementation Uses GeoTools to aggregate different datastores
centrally Includes GML application schema extension for
supporting 3th-party like WOML Allows direct querying of complex meteorological
features WOML-encoded Enables data fusion between remote and local
sources is Inspire-ready because of the abilities passed-
down by its extension for Inspire services
10 aprile 2023
Author: Francesco Bartoli
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OGC WFS Protocol Reference implementation of WFS
http://ogsuite.geobeyond.it/geoserver/wfs?SERVICE=wfs&VERSION=1.1.0&REQUEST=GetFeature&TYPENAME=usa:states&FEATUREID=states.39
Consuming WOML services
May 23, 201214
Author: Francesco Bartoli
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GML app-schema extension Place the jar file into the WEB-INF/lib directory Package for each feature:
<root_dir> <featureType_dir>
featuretype.xml layer.xml
datastore.xml <featureType_mapping_file>.xml
Mapping for WFS Feature Chaining for multivalued member
property (i.e. WeatherForecast)
May 23, 2012
Author: Francesco Bartoli
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Configuration Declaration of secondary namespace is
essential for GML 3.2.1 by WFS 2.0 PostGIS, Oracle, ArcSDE supported as
database options for datastore Typical configuration:
<as : AppSchemaDataAccess><namespaces >... </namespaces><includedTypes >... </includedTypes><sourceDataStores >...</sourceDataStores><targetTypes ... </ targetTypes><typeMappings >... </typeMappings>
</as : AppSchemaDataAccess>
May 23, 2012
Author: Francesco Bartoli
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Feature Chaining CloudArea feature collection has a certain number of
SWO features nested in the multivalued property targetRegion Use of complex sourceExpression combined with three childs:
OCQL which filters out the attribute of cloud_area belonging to the chaining
linkElement corresponding to the targetElement of feature which you are linking to
linkField specifying XPath related to the feature property significantly involved to the chaining
A sort of LEFT JOIN “…FROM cloud_area, linkElement WHERE
<OCQL exp>…linkField” Resource de-normalisation as of M-M association (sorted
by FID)
May 23, 2012
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WOML schema mapping
May 23, 2012
Author: Francesco Bartoli
Single womlswo:CloudArea: is observed at several distinct locations
on the Earth’s surface has a multivalued womlcore:targetRegion property of womlcore:GeographicRegionPropertyType
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Design WOML database
May 23, 2012
Author: Francesco Bartoli
PostGIS as natural database for a spatially- stack
De-normalisation left to feature chaining Hybrid generalisation model for SWO
features
abstract_meteorological_object
abstract_line_object abstract_surface_objectabstract_point_object
jet_stream abstract_line occluded_front
surface_precipitation_areacloud_areaabstract_pressure_cent
erabstract_stor
m
abstract_met_symbol
Author: Francesco Bartoli
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Sample requesthttp://localhost:8080/geoserver/wfs?request=GetFeature&typeName=womlswo:CloudArea& bbox=47.99,56.22,52.23,62.99
Response:<wfs:FeatureCollection….> <wfs:member> <womlswo:CloudArea gml:id=" cloud_area .2 "> <gml:boundedBy> <gml:Envelope srsDimension="2" srsName="urn:x− ogc:def:crs:EPSG:2398 ”> <gml:lowerCorner>45.828799 51.057128</gml:lowerCorner>
<gml:upperCorner>50.903033 62.614745</gml:upperCorner> </gml:Envelope> </gml:boundedBy><womlcore:creationTime>2009−02−01T12:44:30Z</womlcore:creationTime><womlcore:shortInfo xml:lang="Ita−it ">Area nuvolosa interna</womlcore:shortInfo> <womlcore:controlSurface>….</womlcore:controlSurface><womlcore:targetRegion>…. </womlcore:targetRegion>….</womlswo:CloudArea></wfs:member></wfs:FeatureCollection>
May 23, 2012
Author: Francesco Bartoli
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Key benefit
Interoperability!
May 23, 2012
10 aprile 2023
Author: Francesco Bartoli
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Challenges To be scoped under the authority of Italian
Civil Protection Schema transformation for implementing
services under Inspire Annex III – Atmospheric Conditions and Meteorological Geographical Features
WOML candidated under the OGC umbrella? Implementing WxS Inspire-compliant
service with GeoServer Inspire extension
10 aprile 2023
Author: Francesco Bartoli
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Contact us Geobeyond Source code on GitHubhttps
://github.com/geobeyond/GEWOML Follow us on twitter Contact [email protected]
