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  1. The coordinated and correlated dimensional data used in geodesy and cartography to determin


Related Terms

MICROCONTROLLER

A microcomputer, microprocessor, or other equipment used for precise process control in data handling, communication, and manufacturing.

DISTRIBUTED NUMERICAL CONTROL

The use of central computers to distribute part-classification data to machine tools which themselves are controlled by computers or numerical control tapes.

OUTPUT-LIMITED

Restricted by the need to await completion of an output operation, as in process control or data processing.

DISTRIBUTED CONTROL SYSTEM

A collection of modules, each with its own specific function, interconnected tightly to carry out an integrated data acquisition and control application.

COLOR-BAR CODE

A code that uses one or more different colors of bars in combination with black bars and white spaces, to increase the density of binary coding of data printed on merchandise tags or directly on products for inventory control and other purposes.

VESSEL TRAFFIC SERVICES

A system of regulations, communications, and monitoring facilities established to provide active position monitoring, collision avoidance services, and navigational advice for vessels in confined and busy waterways. There are two main types of VTS, surveilled and non-surveilled. Surveilled systems consist of one or more land-based radar sites which output their signals to a central location where operators monitor and to a certain extent control traffic flows. Non-surveilled systems consist of one or more calling-in points at which ships are required to report their identity, course, speed, and other data to the monitoring authority.

CONTROL CURRENT STATION

A current station at which continuous velocity observations have been made over a minimum of 29 days. Its purpose is to provide data for computing accepted values of the harmonic and nonharmonic constants essential to tidal current pre- dictions and circulatory studies. The data series from this station serves as the control for the reduction of relatively short series from subordinate current stations through the method of comparison of simultaneous observations.

DATA-ACQUISITION STATION

A ground station used for performing the various functions necessary to control satellite operations and to obtain data from the satellite

MONITOR

  1. An instrument used to measure continuously or at intervals a condition that must be kept within prescribed limits, such as radioactivity at some point in a nuclear reactor, a variable quantity in an automatic process control system, the transmissions in a communication channel or bank, or the position of an aircraft in flight. 2. To use meters or special techniques to measure such a condition. 3. A person who watches a monitor.

AMERICAN TABLE OF DISTANCES

Published data concerning the safe storage of explosives and ammunition.

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