Introduction

The Global Positioning System (GPS) is a burgeoning technology, which provides unequalled accuracy and flexibility of positioning for navigation, surveying and GIS data capture. The GPS NAVSTAR (Navigation Satellite timing and Ranging Global Positioning System) is a satellite-based navigation, timing and positioning system. The GPS provides continuous three-dimensional positioning 24 hrs a day throughout the world. The technology seems to be beneficiary to the GPS user community in terms of obtaining accurate data upto about100 meters for navigation, metre-level for mapping, and down to millimetre level for geodetic positioning. The GPS technology has tremendous amount of applications in GIS data collection, surveying, and mapping.


Geopositioning -- Basic Concepts

By positioning we understand the determination of stationary or moving objects. These can be determined as follows:

1. In relation to a well-defined coordinate system, usually by three coordinate values and
2. In relation to other point, taking one point as the origin of a local coordinate system.

The first mode of positioning is known as point positioning, the second as relative positioning. If the object to be positioned is stationary, we term it as static positioning. When the object is moving, we call it kinematic positioning. Usually, the static positioning is used in surveying and the kinematic position in navigation.


Some Interesting Links :

1. An Introduction to Global Positioning Systems
   An Introduction to Global Positioning Systems Jason Dykes, VFC, University of Leicester, UK
2. GPS Basics
   An Introduction to GPS by GPS Scales Waypoint Enterprises
3. Introduction to GPS
   An article submitted by Mark Bohrer
4. GPS
   An introduction by Obsidian Hydration Analysis Service
5. What is GPS?
   Definition of GPS by whatis.com
6. Global Positioning Systems
   A complete review of GPS by Nu Horizons Electronics Corp.
7. How GPS Works
   An Introduction by Craig Haggart
8. Introduction to GPS Systems
   A complete introduction to GPS by Silicon Systems Electronics Corporation
9. Understanding GPS
   This document provides a verbal explanation of the Global Positoning System by Diana Cooksey
10. Global Positioning Systems
    An Overview by The Geographer's Craft

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