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1. On the sea floor, an elevation rising generally more than 500 meters and less than 1,000 meters and of limited extent across the summit. 2. A small rounded hill.

Related Terms

PERMANENT BENCHMARK

A readily identifiable, relatively permanent, recoverable benchmark that is intended to maintain its elevation without change over a long period of time with reference to an adopted datum, and is located where disturbing influences are believed to be negligible.

ORTHOMETRIC CORRECTION

A systematic correction that must be applied to a measured difference in elevation since level surfaces at varying elevations are not absolutely parallel.

OPDAR

A laser system for measuring elevation angle, azimuth angle, and slant range of a missile during its firing period. Derived from optical direction and ranging. Also known as optical radar.

HYPSOMETRY

The measuring of elevation with reference to sea level.

HIGH-LIFT TRUCK

A forklift truck with a fixed or telescoping mast to permit high elevation of a load.

HIGH WATER MARK

A line or mark left upon tide flats, beach, or alongshore objects indicating the elevation of the intrusion of high water. It should not be confused with the MEAN HIGH WATER LINE or MEAN HIGHER HIGH WATER LINE

HYPSOGRAPHIC DETAIL

The features pertaining to relief or elevation of terrain

HIGH WATER LINE

1. The intersection of the land with the water surface at an elevation of high water. 2. The line along the shore to which the waters normally reach at high water

HYPSOGRAPHY

1. The science or art of describing elevations of land surfaces with reference to a datum, usually sea level. 2. That part of topography dealing with relief or elevation of terrain.

HYPSOMETRIC TINTING

A method of showing relief on maps and charts by coloring, in different shades, those parts which lie between different levels. Also called ALTITUDE TINTS, COLOR GRADIENTS, ELEVATION TINTS, GRADIENT TINTS, LAYER TINTS.

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