geo-spatial standards and transports: ogc and inspire

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

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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


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What are the OGC standards about?

“OGC® Standards support interoperable

solutions that "geo-enable" the Web, wireless

and location-based services and

mainstream IT.”


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Who's in the club?


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In other words, how to handle geographical

information in

• Data (Raster. Vector, Attributes)

• Metadata (authorship, licence, accuracy)

• Services (how to get the above)


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Data formats

Raster data (grid)

satellite images

digital aerial photos

digital elevation data

Default format is GeoTIFF


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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


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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


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Simple Feature basic geometry types

POINT


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LINESTRING


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POLYGON


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POLYHEDRAL SURFACES


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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)


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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


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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


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OGC Services: WMS


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OGC Services: WFS

The Web Feature Service delivers data:

vectors and attributes


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OGC Service: WCS

The Web Coverage Service allows to distribute

raster data over the web


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OGC Services: CSW


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OGC Services: WPS


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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


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OGC Services: Open LS

The OpenGIS Location Services

is of particular interest for today's agenda


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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”


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Open LS scope

2 Gateway Service to retrieve the position of a

known Mobile Terminal from the network.


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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


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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)


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Open LS scope

5 Route Service to determine travel routes and

navigation information between two

or more points


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Open LS scope

6 Navigation Service, to determines the routes

between two or more points and the

associated navigation information


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Open LS scope

Presentation Service to the visual context, e.g.

maps


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Open LS

This standard is rather new.

Unfortunatly, there it is not wildly used, ATM


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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)


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INSPIRE and OGC

Extension to the OGC services

INSPIRE extends the latest OGC Service

specifications to make them multilingual


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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


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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


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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.


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INSPIRE: Transport Networks


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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


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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


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FreeGIS.net: Schematic View


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FreeGIS.net


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A proof of concept

http://sasa.tis.bz.it

Publish the current bus position with standard

OGC services


http://sasa.tis.bz.it/

http://sasa.tis.bz.it/

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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


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Still here?

Thank you!


Grazie per l’attenzione

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OpenLS and other relevant standards


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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


http://freegis.r3-gis.com/gisclient/services/ows.php?PROJECT=demo&MAP=demo_gisclient&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetCapabilities






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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

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