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Foss4gcee2012-Geospatial Engine for sharing meteorological objects
1. Geobeyond
May 23, 2012
Geospatial engine
for sharing
meteorological
objects
Powered by GeoServer
1 Author: Francesco Bartoli
2. 2 May 23, 2012
Agenda
What is WOML?
GeoServer, a geospatial engine server for
consuming data
GML application schema extension
PostGIS, a spatial database for WOML
Challenges
Author: Francesco Bartoli
3. 3 May 23, 2012
WOML
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
4. 4 May 23, 2012
WOML Schemas
Specificationmaintained at FMI confluence
GML application schema
Based on top of GML 3.2.1 (latest version)
Inheritance as mechanism for specialisation
4 Namespaces WOML WOML WOML
SWO Quantity Textfct
25 Features
WOML Core
Author: Francesco Bartoli
5. 5 May 23, 2012
WOML Core
Building block for Geometry
Point
Line
Surface
Author: Francesco Bartoli
6. 6 May 23, 2012
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
Author: Francesco Bartoli
7. 7 May 23, 2012
Core Diagram
Author: Francesco Bartoli
8. 8 May 23, 2012
WOML SWO
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
9. 9 May 23, 2012
SWO Diagram
Author: Francesco Bartoli
10. 10 May 23, 2012
WOML Quantity & Textfct
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
TheTextfct namespace describes text-based
weather forecasts for specific target areas
Focused on lightweight exchange of data
Forecast which needs human explanation
Author: Francesco Bartoli
11. 11 May 23, 2012
Key Concepts
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
Autore: Francesco Bartoli
12. 12 May 23, 2012
GeoServer
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
Author: Francesco Bartoli
13. 13 28 maggio 2012
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
Author: Francesco Bartoli
15. 15 May 23, 2012
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)
Author: Francesco Bartoli
16. 16 May 23, 2012
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>
Author: Francesco Bartoli
17. 17 May 23, 2012
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)
Author: Francesco Bartoli
18. 18 May 23, 2012
WOML schema mapping
Single womlswo:CloudArea:
is observed at several distinct locations on the
Earth’s surface
has a multivalued
womlcore:targetRegion property of
womlcore:GeographicRegionPropert
yType
Author: Francesco Bartoli
19. 19 May 23, 2012
Design WOML database
PostGIS as natural database for a spatially-
stack
De-normalisation left to feature chaining
Hybrid generalisation model for SWO features
jet_stream abstract_line occluded_front
abstract_met_symbol
abstract_pressure_cente
abstract_storm cloud_area surface_precipitation_area
r
abstract_point_object abstract_line_object abstract_surface_object
abstract_meteorological_object Author: Francesco Bartoli
21. 21 May 23, 2012
Key benefit
Interoperability!
Author: Francesco Bartoli
22. 22 28 maggio 2012
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
Author: Francesco Bartoli
23. 23 28 maggio 2012
Contact us
Geobeyond
Source code on
GitHubhttps://github.com/geobeyond/GEWO
ML
Follow us on twitter
Contact francesco.bartoli@geobeyond.it
Author: Francesco Bartoli
Editor's Notes
GeoServer is a cutting edge technology in the geospatial realm more often by enabling lots of its collateral extensions. A practical example of GeoServer’s capabilities to implement OGC Web Feature Service – a source for sharing vector data in Spatial Data Infrastructure – is hidden by the Geography Markup Language Application Schema extension.The power of this plugin figures out how it is feasible to share semantically meteorological objects as defined by WOML (Weather Objects Modeling Language), an application schema based on top of GML.WOML has been defined with interoperability in mind with no care of visualization rules in order to support data sharing among different stakeholders.This paper would explain some handful best practices to enabling those capacities by using PostGIS as selected spatial database for meteorological features such as Cold Fronts, Warm Fronts, Surface of precipitation area, etc.
