Architecture A system architecture is the conceptual design that defines the structure and/or behavior of a system There is no universally agreed definition Systems architecture can best be thought of as a representation Maybe expressed in hardware, software, or organizational management It is also a process because a sequence of steps It can also be a discipline

Past Implementations Department Community Organizational Federated

New(er) Implementations Feeds SOA Mash Up Multiple Client Platforms

WebClient Enterprise Service Bus TerrainService HighestPointService Loosely Coupled and Orchestrated Services Services Oriented Architecture (SOA) InterconnectedInterconnected InteroperableInteroperable IntegrativeIntegrative DynamicDynamic WebClientWeb Point-to-Point Services Highest Point Service SOA - Packaging functionality as a suite of interoperable services that can be used within multiple separate systems from several business domains.

Google Maps/Virtual Earth/… Internet User Data Web Browser ArcGIS Server “Mash-Up” content ArcGIS Servers & ArcGIS Online Mash Up GIS with Other Web Services

Serve and Consume Information Feeds Feed Types: RSS GeoRSS CAP KML SensorML Video Produce: Mobile Clients In-situ sensors Consume: Visualize Analyze

Many Client Platforms Web Map Viewers Desktops 2D / 3D Explorers MobileDevices Open APIs Desktop GIS Author Management Visualization Analysis ArcGIS Server Manage-Serve Find-Integrate-Use

Federated SOA? Federated Architecture (FA) allows interoperability and information sharing between semi- autonomous de-centrally organized lines of business (LOBs). SOA - Packaging functionality as a suite of interoperable services that can be used within multiple separate systems from several business domains.

Keep those thoughts! New Thoughts

Tomlinson’s 10 Stages Stage 1: Strategic purpose Stage 2: Plan for planning Stage 3: Technology seminar Stage 4: Describe information products Stage 5: Define system scope Stage 6: Create the data design Stage 7: Choose the logical model Stage 8: Determine system requirements Stage 9: Cost benefit Stage 10: Plan for implementation

Software selection Summarize the function requirements

Views of a System Architecture ISO Reference Model of Open Distributed Processing (RM-ODP) –Enterprise Viewpoint: It is directed to the needs of the users of an information system. –Information Viewpoint: It focuses on the information content of the enterprise. –Computational Viewpoint: It deals with the logical partitioning of the distributed applications independent of any specific distributed environment on which they run. –Engineering Viewpoint: It addresses the issues of system support (platform) for distributed applications. –Technology Viewpoint: The technology model identifies possible technical artifacts for the engineering mechanisms, computational structures, information structures, and enterprise structures.

Architecture Development.

Steps Defining Architecture Requirements. –to enable the system to meet the community’s goals and objectives. Defining a Candidate Architectures. –to evolve an architecture gradually. Defining Enterprise Architecture. –integrate it into an enterprise architecture model. Defining Reference Architecture. –a working example designed and proven for use in by the participants Validating a Reference Architecture.