Maps GPS Glossary - K, LK, 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. knot - A unit of speed of one nautical mile per hour, equal to 1.15 statute mile per hour (1.85 kilometers per hour). LAAS - see Local Area Augmentation System lagoon - A shallow body of water, especially one separated from a sea by sandbars or coral reefs. 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. 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.
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