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2009年8月18日 (火) 16:06時点における版
What is GPS?
GPS, the Global Positioning System, is a satellite-based system that allows anyone with a GPS receiver to find their exact position anywhere in the world.
It is used as an aid in navigation, for example in airplanes, in boats and by hikers.
The GPS receiver uses the signals from the satellites to calculate its latitude, longitude and (sometimes) elevation.
Most receivers also have the capability to store locations (known as waypoints), sequences of locations that make up a planned route and a tracklog or track of the receivers movement over time.
Waypoints, routes and tracks are the three basic feature types in GPS data.
QGIS displays waypoints in point layers while routes and tracks are displayed in linestring layers.
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