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A short overview of OGC standards, which may be relevant to the traffic and transport sector, is given. A short mention of the european INSPIRE initiative completes the picture.
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1 www.r3-gis.com
Geo-spatial
standards and transports:
OGC and INSPIRE
Peter Hopfgartner
www.r3-gis.com 2
Outline
•The Open Geospatial Consortium
•The most relevant OGC specifications
•OpenLS
•INSPIRE
•The Transport Network specification
•FreeGIS
Geo-spatial standards and transports: OGC and INSPIRE
www.r3-gis.com 3
The Open Geospatial Consortium
What is the OGC?
The OGC is an consortium of more then 400
members, among those are
• Companies
• Government agencies
• Universities
Geo-spatial standards and transports: OGC and INSPIRE
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The Open Geospatial Consortium
What are the OGC standards about?
“OGC® Standards support interoperable
solutions that "geo-enable" the Web, wireless
and location-based services and
mainstream IT.”
Geo-spatial standards and transports: OGC and INSPIRE
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The Open Geospatial Consortium
Who's in the club?
Geo-spatial standards and transports: OGC and INSPIRE
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The Open Geospatial Consortium
In other words, how to handle geographical
information in
• Data (Raster. Vector, Attributes)
• Metadata (authorship, licence, accuracy)
• Services (how to get the above)
Geo-spatial standards and transports: OGC and INSPIRE
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Data formats
Raster data (grid)
satellite images
digital aerial photos
digital elevation data
Default format is GeoTIFF
Geo-spatial standards and transports: OGC and INSPIRE
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Vector Data
More complicated then raster
A common geometry model must be defined,
which must be simple enough to allow a
wide range of computations and must be
easy to implement
A common geometry model is defined in the
Simple Feature Specification
This is the basic specification for vector data
Geo-spatial standards and transports: OGC and INSPIRE
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Vector Data: Simple Features
Basically, 2D entities are handled, ATM
Geometries are based on linear interpolations
Geometries must respect some topological
rules in order to be valid
Geo-spatial standards and transports: OGC and INSPIRE
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Simple Feature basic geometry types
POINT
Geo-spatial standards and transports: OGC and INSPIRE
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Simple Feature basic geometry types
LINESTRING
Geo-spatial standards and transports: OGC and INSPIRE
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Simple Feature basic geometry types
POLYGON
Geo-spatial standards and transports: OGC and INSPIRE
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Simple Feature basic geometry types
POLYHEDRAL SURFACES
Geo-spatial standards and transports: OGC and INSPIRE
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GML
There are many encodings of the geometries.
Encodings are available for text and binary
representations.
GML is an XML based encoding of the
geometry (and a lot more)
Geo-spatial standards and transports: OGC and INSPIRE
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Metadata
Typical metadata are
• Title
• Abstract
• Spatial Reference System
• Keywords
• Authorship
• Licences
• Spatial position (envelope)
• Metadata is important for cataloging and
searching
Geo-spatial standards and transports: OGC and INSPIRE
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OGC Services
The OGC Services are all web based
Typically, OGC servives are self describing
(Capability document)
Preferred exchange formats are XML based
(except for raster data)
They allow to deliver metadata for the service
Geo-spatial standards and transports: OGC and INSPIRE
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OGC Services: WMS
Geo-spatial standards and transports: OGC and INSPIRE
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OGC Services: WFS
The Web Feature Service delivers data:
vectors and attributes
Geo-spatial standards and transports: OGC and INSPIRE
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OGC Service: WCS
The Web Coverage Service allows to distribute
raster data over the web
Geo-spatial standards and transports: OGC and INSPIRE
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OGC Services: CSW
Geo-spatial standards and transports: OGC and INSPIRE
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OGC Services: WPS
Geo-spatial standards and transports: OGC and INSPIRE
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OGC Services: SOS
The Sensor Observation Service allows a wide
range of operations on sensor data, tipically
organized as time series
Geo-spatial standards and transports: OGC and INSPIRE
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OGC Services: Open LS
The OpenGIS Location Services
is of particular interest for today's agenda
Geo-spatial standards and transports: OGC and INSPIRE
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Open LS scope
The Services defined by the Open LS are
1 Directory Service: to find the location of a
specific or nearest place, product,
or service
The Directory Service can answer to request
like: “Where is the nearest pet shop”
Geo-spatial standards and transports: OGC and INSPIRE
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Open LS scope
2 Gateway Service to retrieve the position of a
known Mobile Terminal from the network.
Geo-spatial standards and transports: OGC and INSPIRE
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Open LS scope
3 Geocoding Service to convert a text
description of a location, such as a place
name, street address, or postal code to a
position
Geo-spatial standards and transports: OGC and INSPIRE
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Open LS scope
4 Reverse Geocoding Service to converts
given position into a normalized description
of a feature location (Address with Point)
Geo-spatial standards and transports: OGC and INSPIRE
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Open LS scope
5 Route Service to determine travel routes and
navigation information between two
or more points
Geo-spatial standards and transports: OGC and INSPIRE
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Open LS scope
6 Navigation Service, to determines the routes
between two or more points and the
associated navigation information
Geo-spatial standards and transports: OGC and INSPIRE
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Open LS scope
Presentation Service to the visual context, e.g.
maps
Geo-spatial standards and transports: OGC and INSPIRE
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Open LS
This standard is rather new.
Unfortunatly, there it is not wildly used, ATM
Geo-spatial standards and transports: OGC and INSPIRE
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INSPIRE
INSPIRE: INfrastructure for SPatial Information in
the European Community
The ultimate goal for INSPIRE is to allow an
easy retrieval and interoparability for all
geographical public data in Europe in order
to create a European Union Spatial Data
Infrastructure (SDI)
Geo-spatial standards and transports: OGC and INSPIRE
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INSPIRE and OGC
Extension to the OGC services
INSPIRE extends the latest OGC Service
specifications to make them multilingual
Geo-spatial standards and transports: OGC and INSPIRE
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INSPIRE and OGC
Extension to the OGC metadata model
INSPIRE adds a more restringent policies on
metadata to make allow easier retrieval of
the data
Geo-spatial standards and transports: OGC and INSPIRE
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INSPIRE and OGC
INSPIRE defines a precise structure for the data
belonging to a wide range of topics related
to enviroment, government and transport:
Annex I: Administrative Units, Cadastral
Parcels, Geographical Names,
Hydrography, Protected Sites, Transport
Networks, Addresses
Annex II & III add 24 topics
Geo-spatial standards and transports: OGC and INSPIRE
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INSPIRE: Transport Networks
This specification defines how data sets
belonging to road, rail, air and water
transport networks and related infrastructure
shall be structured in order to allow a
seamless integration between differant data
sets different data providers.
Geo-spatial standards and transports: OGC and INSPIRE
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INSPIRE: Transport Networks
Geo-spatial standards and transports: OGC and INSPIRE
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The software side
There is a large choice of software to create
OGC and INSPIRE compiant services, at
least for WMS (maps), WFS (vectors and
attributes), WCS (raster data) and CSW
(cataloging and searching)
Example FreeGIS.net*
• * FreeGIS.net is an Interreg Italy-Switzerland project financed by the
Program of superregional cooperation Italy-Switzerland 2007-2012 of
the ERDF and the European Union. Partners are the Free Software
Center South Tyrol, R3 GIS, Office of information technology canton
of Graubünden, Office 9.6, Province of Bolzano and Sourcepole AG
Geo-spatial standards and transports: OGC and INSPIRE
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FreeGIS.net
From a software POV, FreeGIS has the goal to
allow a integrated solution to import, store
and publish geographical data compatible
with OGC and INSPIRE.
The software created within the FreeGIS.net
project is Open Source Software
Geo-spatial standards and transports: OGC and INSPIRE
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FreeGIS.net: Schematic View
Geo-spatial standards and transports: OGC and INSPIRE
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FreeGIS.net
Geo-spatial standards and transports: OGC and INSPIRE
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A proof of concept
http://sasa.tis.bz.it
Publish the current bus position with standard
OGC services
Geo-spatial standards and transports: OGC and INSPIRE
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Conclusions
• When it comes to interoperability of
Geographical services and dataset, OGC is
the premier provider of widely accepted
standards
• INSPIRE aims to further help seamless
integration through a detailed definition of
how data is structured
Geo-spatial standards and transports: OGC and INSPIRE
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Still here?
Thank you!
Geo-spatial standards and transports: OGC and INSPIRE
Grazie per l’attenzione
www.r3-gis.com 45
OpenLS and other relevant standards
Geo-spatial standards and transports: OGC and INSPIRE
www.r3-gis.com 46
WMS requests
Capabilities document:
http://freegis.r3-
gis.com/gisclient/services/ows.php?PROJECT=demo&MAP=demo_gisclient&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetCa
pabilities
Map request:
http://freegis.r3-
gis.com/gisclient/services/ows.php?PROJECT=demo&MAP=de
mo_gisclient&FORMAT=image%2Fpng%3B%20mode%3D8bit&TRANSPARENT=TRUE&GISCLIENT_MAP=1&LAYERS=g_natural_par
k.lp_121&LANG=it&SERVICE=WMS&VERSION=1.1.1&REQUEST=G
etMap&STYLES=&SRS=EPSG%3A25832&BBOX=492118,5100356,8
77881,5241643&WIDTH=1200&HEIGHT=600
Geo-spatial standards and transports: OGC and INSPIRE
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WFS requests
Capabilities document:
http://freegis.r3-
gis.com/gisclient/services/ows.php?PROJECT=demo&MAP=demo_gisclient&SERVICE=WFS&VERSION=1.1&REQUEST=GetCap
abilities
Geo-spatial standards and transports: OGC and INSPIRE