Category Archives: GPS

Geoid

Posted on August 16, 2008 by Rashid Faridi

The geoid is that equipotential surface which would coincide exactly with the mean ocean surface of the Earth, if the oceans were in equilibrium, at rest, and extended through the continents (such as with very narrow canals). According to C.F. … Continue reading →

Posted in earth, GPS, Solar System | Leave a comment

GALILEO:European Satellite Navigation System

Posted on July 15, 2008 by Rashid Faridi

A permanent reference in time and space. Galileo is Europe’s contribution to a global navigation satellite infrastructure (GNSS). More and more often, it will become necessary to ascertain one’s precise position in space and time in a reliable manner. This … Continue reading →

Posted in GPS, Remote Sensing 101 | 1 Comment

Positioning Systems Before GPS

Posted on July 14, 2008 by Rashid Faridi

For thousands of years, speed was limited to a walking pace and landmarks were used to find location. At sea, early navigators limited their voyages to coastal routes to avoid becoming lost. New methods for determining position arose as trade … Continue reading →

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GPS Accuracy and WAAS

Posted on July 13, 2008 by Rashid Faridi

To determine an object’s location, the GPS system must receive a radio signal from at least three satellites. Since each satellite emits a unique signal, the receiver can then match the signal to the satellite and its orbital position. Distance … Continue reading →

Posted in GIS, GPS, Remote Sensing 101 | Tagged | 3 Comments