Glossary of Terms - L

Local Area Network. A system for connecting computers so they can communicate with one another.
A particular system of US satellites that scan the earth at a variety of wavelengths. The satellites return information that can be used to inventory and analyze a variety of natural and human resources.
language independent
Describes a standard or specification which is not specified in terms of a specific programming language, but is implementable in a variety of languages.
layered map visualization
Pictoral representation of geographic data
Source: PreANVIL Glossary
See Location Based Services
legacy system
In computing terms, a legacy System includes software or database components inherited from a previous computing model which do not fit into an open system environment without some modification. In the case of the OpenGIS Specification, legacy systems are modified to include OpenGIS-conformant interfaces.
line string
A set of coordinate points and the lines that join them.
Location Based Services (LBS)
Source: PreANVIL Glossary
Location Based Services (or "Location Services") deliver information about location to people who are using wireless, position-aware devices such as cell phones and PDAs. A wireless-IP service that uses geographic information to serve a mobile user. Any application service that exploits the position of a mobile terminal.
Location Dependent Services
Source: PreANVIL Glossary
"Services in which the location of the client, server or both form an integral part of the service "
Location Organizer Folder (LOF)
The general, multi-source information container model for handling sets of inter-related spatiotemporal information, including images, maps, features, cables, and any other information elements (e.g., audio, video, etc).
location service
Source: PreANVIL Glossary
A service that provides the location of a moving or fixed device
Long-Term Technical Baseline Target
The Long-Term Technical Baseline Target is the subset of the elements of the Technical Plan that are scheduled to be completed greater than two calendar years into the future.
loosely-coupled service
A service that can be used to operate on multiple, unspecified datasets. Calling application has no structural dependency on the interface of called application. Call is not made in same technology as the interface of the called application.
Lempel-Zif-Welch: a popular data compression technique developed in 1977 by J. Ziv and A Lempel. Unisys researcher Terry Welch later created an enhanced version of these methods, and Unisys holds a patent on the algorithm. It is widely used in many hardware and software products, including V.42bis modems, GIF and TIFF files and PostScript Level 2.

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