Field Techniques Manual : GPS, GIS and Remote Sensing
The Global Positioning System (GPS) is a technical marvel made possible by a group of satellites in earth orbit that transmit precise signals, allowing GPS receivers to calculate and display accurate location, speed, and time information to the user.
GPS was originally created by the United States Department of Defense (DOD) as a military application.
GPS signals may be blocked by dense forest, canyon walls, or skyscrapers, and they don’t penetrate indoor spaces well, so some locations may not permit accurate GPS navigation.
While the U.S. owned and operated GPS is currently the only active system, five other satellite-based global navigation systems are being developed by individual nations.
Definition of GIS:
A geographic information system (GIS) integrates hardware, software, and data for capturing, managing, analyzing, and displaying all forms of geographically referenced information on the monitor or the display.
Definition of remote sensing:
The scanning of the earth by satellite or high-flying aircraft in order to obtain information about it.
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