Glossary of Terms - T

Definitions: 
TC/211
Source: PreANVIL Glossary http://www.anvil.eu.com/find/Glossary-english.htm
Technical Committee within ISO for Geographic Information/ Geomatics standards
Technical Baseline
The OGC Technical Baseline, at any point in time, is the set of all Adopted Specifications plus all other technical documents that have been approved by the OGC Technical and Planning Committees, including the OpenGIS Reference Model, OpenGIS Abstract Specifications, Recommendation Papers, and Discussion Papers.
Technical Committee
In the OGC Specification Program, the OGC Technical Committee reviews specifications for interfaces and encodings developed either in the Interoperability Program by groups of members, or through an internal proposals process. The Technical Committee and Planning Committee then approve these as "adopted" OpenGIS® Specifications for release to the public. The OGC Technical Committee is comprised of the technical representatives of all OGC member organizations. The Technical Committee does the bulk of its work through its Working Groups.
Technical Plan
The OGC Technical Plan, at any point in time, is the set of planned modifications and additions to the Technical Baseline that could occur over a given time horizon. This includes both the specification documents as well as the Supporting Material.
Technology Insertion Project
In OGC: Collaborative project focusing on expanding an organization's interoperability capacity by laying the infrastructure (groundwork) for open implementations.
technology viewpoint
RM-ODP viewpoint concerned with the underlying infrastructure in a distributed system. It describes the hardware and software components used in a distributed system. The infrastructure, which may be provided by a Distributed Computing Platform (DCP), allows objects to interoperate across computer networks, hardware platforms, operating systems and programming languages.
temporal reference system
The temporal reference system package in the ORM provides elements for describing temporal reference systems, e.g., calendars and clocks.
testbed
In the context of OGC's Interoperability Program, a testbed is a collaborative activity in which sponsors provide interoperability requirements and financial support and technology providers team to develop prototype interoperability interfaces, protocols etc. that meet those requirements. The testbed concludes with a public demonstration, and the prototype-derived specifications are submitted to the OGC Technical Committee for review and approval.
thematic map
A map showing, by color or pattern, the distribution of a single phenomenon
thick clients
Clients that handle much of the necessary computation and data/metadata management themselves; and rather than invoking the processing services of other components, they obtain their inputs through low-level data-access requests.
thin clients
Clients that rely on invoking the services of other components (servers, middleware) for most of the computation they need to function in the system; they also rely on other components to manage most of the data and metadata they use.
TIFF
Tagged Image File Format. A graphic file format developed by Aldus and Microsoft.
TIGER
Topologically integrated geographic encoding and referencing file. This is a type of digital map developed by the U.S. Bureau of the Census to support the 1990 population census. Census maps in TIGER format succeed the previous DIME format. TIGER files are available for every county in the United States and for the millions of census blocks in urban areas. Although the accuracy of TIGER files varies from county to county, partly for reasons beyond the control of the Bureau, they are likely to improve in coming decades. The TIGER files are a particularly important resource for many urban GIS. The Census Bureau is moving to provide TIGER data in GML.
tightly coupled data and service
An instance of a service associated with a specific instance of a dataset.
tightly-coupled
Calling application must have detailed knowledge of interfaces of called application. Call is likely made in same technology, and using same call structure.
tool
A software component, sometimes called an application object, which can act as either a service provider or service requester within an application platform.
topographic map
Source: AGI glossary. http://www.geo.ed.ac.uk/agidict/welcome.html
"A map whose principal purpose is to portray the features of the earth`s surface. These features might include the cultural landscape, but normally refer to the terrain and its relief."
topology
Properties of geometric forms that remain invariant when the forms are deformed or transformed by bending, stretching, and shrinking. Among the topological properties of concern in GIS are connectivity, order, and neighborhood. One productive use of topology is to accelerate computational geometry. Geometric calculations such as containment (point-in-polygon), adjacency, boundary, and network tracking are computationally intensive. For this reason, combinatorial structures known as topological complexes are constructed to convert computational geometry algorithms into combinatorial algorithms. Another purpose is, within the geographic information domain, to relate feature instances independently of their geometry.
trader
A kind of intermediary service which acquires services from one or more providers for `resale` to a service requester. The trader service insulates requester and provider services from having to interact directly with one another. The trader is responsible to the requester for all aspects of the requested service.
transfer protocol
Source: ISO 19118
Common set of rules for defining interactions between distributed systems.
translation
The process of converting data or commands from one computer format to another, or from one computer language to another.
transparency
The ability of systems or components of systems to hide the details of their implementations from other client or server systems or components of systems.
tuple
An ordered set. Such a set of coordinates that define a point.



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