GPS (Global Positioning System)
GPS navigation system consist of minimum 3 satellites and nowadays the number is 4 because the fourth one gives us the height of the observed point and the three other gives position in earth or nearby. Anyone in earth can use GPS system through a GPS receiver.GPS provides a wide range of facilities and it has a variety of applications.it is initially a military project but later on commercialized.nowadays it has became very popular in civil and commercial usage.
How its WORK ?
The orbiting satellites, presently 31 in approximately 12,600 miles, transmit signals that allow a
GPS receiver anywhere on earth to calculate its own position through trilateration. A minimum of four GPS satellite signals are required to compute positions in three dimensions and the time offset in the receiver clock.
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GPS advantages and disadvantages:
- Spatial and tabular data are collected simultaneously
- Signals available free of charge
- Position accuracy is superior to conventional methods (some are within sub- cm)
- Coordinate systems and reference datum can be easily changed in the field and in the processing software
- GIS conversion is simple
- The process is relative time concise, easy, and FUN
- Requires training and retraining as technology changes
- Buildings or heavy foliage can block satellite signals
- Requires careful attention to system configuration and data collection standards and procedures
Categories:
GPS | GIS
3 comments:
THATS COOL....
Thanx sir....
The GPS permits you to grasp wherever you're in any respect times and to administer you quick directions to where you wish to travel. In fact, the GPS has a lot of alternative edges that makes it good for a taxi service. There square measure a lot of reasons why taxi services ought to install GPS units into all of their cabs, the subsequent square measure four of these reasons.That is.
Watching Your Cabs,. Instant info,. Higher Service,Saving cash and many more..
Thanks for sharing with us.
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