SDI from a technological perspective: Architecture Arnold Bregt

Do you know this building?

Architecture design

Construction

Building regulations and standards

Content Architecture for buildings Architecture for SDI Design Components Standards Architecture for SDI Overall design

Comparison bestween buildings and SDI’s Design for Building to Construct using Material and Methods Constrained by Standards Design for SDI to Implement using Software tools based on Standards

IT Architectures Service Oriented Architecture (SOA) (see Lukasz) Client-Sever Architecture

Client-server Architecture

Example e-mail

Service Oriented Arichtecture Geoportal webapplication Catalog service Search mechanism Source database Metadata editor Services Internet explorer GIS software We gaan uit van het basisprincipe van Publish/Bind/Find zoals dat door W3C is vastgelegd. Dat wordt meestal uitgelegd in een heel erg technische context van webservices en service oriented architectures, maar het gaat eigenlijk ook op voor de manier waarop mensen bijvoorbeeld gebruik maken van de lokale bibliotheek. Aanbieders van informatie documenteren de producten die ze in de aanbieding hebben en leggen deze (meta)-informatie vast in een of meerdere catalogi. Dat kan zijn in een centrale catalogus maar ook in meerdere decentrale catalogi die op 1 plek worden ontsloten. Vaak hebben de bibliotheken in de wijken de complete catalogus voor een hele stad ter inzage. Zo kan je ook denken over de catalogi die zich in het geoloketten netwerk bevinden. Iedere aanbieder bepaalt zelf bij welke catalogus hij zijn meta-informatie publiceert. De aangesloten catalogi zorgen ervoor dat ze meta-informatie uitwisselen. Mensen die op zoek zijn naar informatie maken gebruik van deze catalogi om uit te vinden waar de services zich bevinden. Hebben ze eenmaal gevonden wat ze zoeken, dan maken ze rechtstreek contact met de aanbieder om vervolgens deze informatie ook daadwerkelijk te gebruiken. Voor zover een eenvodig model.

Example: Cheaptickets

SDI Architecture Definition: Structure of the system, which is formed by its components, their properties and the relationships and the interaction with the environment. (note link with CAS)

Components (Béjar et al. 2009) Components types (properties) Connector Types Constraints (we will not use it in this week)

How to describe an Architecture? It is free,but: Try to be consistent and clear Look at good examples (e.g. UML) It must communicate the message

Example: Geospatial portal OGC

Example: EO data

Example: Cyberinfrastructure

Example: SDI Galicia

Example: North Rhine-Westphalia

Example: GeoFoss

SDI Architecture INPRIRE

Other examples of Architecture

Software support for SDI Geonetwork EasySDI

Easy SDI Architecture

Case of the week Your SDI as a technological infrastructure” Please analyze the technological aspects of your case SDI. Concentrate on ICT architecture (SOA), standards and services used in your SDI case.

Case of the week With analyse we mean: Draft an architectural picture of your SDI (design your own picture for your own SDI); Describe the components, standards and software technologies used; Reflect on the standards and technologies used (e.g. are they using the latest versions of the standards, what software tools are popular, etc).

Case of the week Create a Create a Table with standards and software tools used for your SDI. Standards (abbreviation) Description Version(s) ....   Software tools .......

Case of the week TIP 1: Study the paper of Béjar et al., 2009 TIP 2: Use OGC and ISO as a reference source for standards (ISO) and standards and software tools (OGC).

Questions?

UML UML: Unified Modeling Language 2000 ISO Standard Describe states and processes Use for describing GI standards.

UML

Web Coverage service (WCS) Technically, WCS Core establishes three request types, inline with the OGC Web Service definition: GetCapabilities: delivers an XML-encoded description of service properties and the data holdings offered by the server inquired. DescribeCoverage: delivers XML-encoded descriptions of coverages (such as their location in space and time). GetCoverage: delivers a coverage (or part thereof), either as original data or processed, in some suitable data format.

XML Aspects Example Extensible Markup Language (XML) Human and Machine readable Very popular