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Maps GPS Glossary - K, L

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K, L

karst - An area of irregular limestone in which erosion has produced fissures, sinkholes, underground streams and caverns.

kinematic GPS - Observations while a receiver is in motion.

knoll - See hillock.

knot - A unit of speed of one nautical mile per hour, equal to 1.15 statute mile per hour (1.85 kilometers per hour).

L1 frequency - One of the two radio frequencies that carries the Coarse Acquisition Code (C/A code), P-Code, and the nav message on 1575.42 MHz. .

L2 frequency - One of the two radio frequencies that carries only the P-Code on 1227.6 MHz. .

LAAS - see Local Area Augmentation System

lagoon - A shallow body of water, especially one separated from a sea by sandbars or coral reefs.

landmark - Important building, monument or place that can be easily recognizable.

latitude - The distance north or south of the equator of a point on the earth's surface.

LBS - Location-Based Services - A service which uses knowledge provided about where a user is located in order to deliver information relevant to the user's position.

leg - The portion of a route between waypoints.

legend - The part of the map where all the symbols that you can find on it have a short description.

levee - An artificially created bank used in areas that are subject to flooding.

lidar - Also called laser radar - A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of pulsed laser light reflected from their surfaces.

Local Area Augmentation System - A specialized type of DGPS to support aircraft landings in a local area (32KM). The first system is scheduled to be operational by late 2006.

location-based services - See LBS.

longitude - The distance east or west of the prime meridian of a point on the earth's surface.

LORAN - Stands for LOng RAnge Navigation and it represents a a grid of radio waves that facilitates accurate position plotting.

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