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GPS can be said the only fully-functional system. Mapping, surveying and navigation to GIS data capture are considered to be some of the main function of GPS. A group or constellation of more than two dozen GPS satellites send out precise timing signal by radio to GPS receivers, and permit them correctly ascertain their whereabouts as altitude, latitude and longitude whatever be the weather, anywhere on the earth, day or night.
The GPS was previously built for real time military positioning. However, today also it serves the same purpose, but this time it has come to use for the civilian community or the general public, besides it has become a vital global usage, essential for modern navigation on land, sea, and air throughout the world, and an important equipment for map-drawing, and surveying of land .This system also gives an accurate precise time reference, needed for telecommunications and some scientific research, comprising the study of earthquakes. The GPS is appropriate and adequate equipment for multiple tasks for mapping and surveying.
This system can be used to map environment disaster like landslides, Forrest fire, and oil spill, and road alignment. And continuous kinematics techniques are easy to be used for topographic surveys and correct linear mapping.GPS can be very helpful for navigation in ships, in vehicle, in helicopters and can give an easy means of navigation with substantial savings. And it can be very useful in plot, canters accident sites, corner posts, plot canters, accident sites, geological formations, and many more.
GPS is also usable for remote or distant sensing and GIS like photogrammetry and aerial scanning, magnetometer, and video technology. The tools or equipment of this system are getting very effectual for GIS data capture. The user community of GIS gets benefit from the use of GPS for locational data capture in many GIS applications.
By dint of using high grade GPS equipment, geodetic mapping and other control surveys can be carried through impressively .Mainly when helicopters were to be used or when the line of sight is impossible, GPS can make new standards of accuracy and productivity. In this way, the system of GPS can assist in many aspects of construction of correct and timely GIS databases.
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