GIS Technology
Author:
Genre: General Awareness

a. Define GIS.

b. How is GIS technology used in your field of interest (which is “land surveying” in my case) to make day to day tasks easier? Provide concrete examples! (Your answers must (a) include examples, (b) be supported by the literature, (c) be fully referenced using the Harvard AGPS system, and (d) be presented separately for each sub-question)

About the Book

GIS Technology

GIS Technology is the technology that helps you to make better decisions about exact location.GIS  Technology is the geographical information systems.GPS is a satellite- and ground-based radio navigation and lavational system that enables he user to find out very accurate locations on the surface of the Earth. Although GPS is a multifaceted and complicated technology, user interfaces have evolved to become very accessible to the non-technical user in today’s time. GPS satellites are orbiting the earth at an altitude of 11,000 miles. The orbits, and the locations of the satellites, are known in advance.GPS receivers store this orbit information for all of the GPS satellites in an ALMANAC*.All 24 satellites are separated into 6 parts. Radio waves travel at speed of light, i.e. about 186,000 miles per second from satellite to receiver. The geometry of the constellation is estimated by Dilution of precision or DOP. The GPS Navigation Message consists of time-tagged data bits marking the time of transmission of each sub frame at the time they are broadcasted by the SV. A data bit frame consists of 1500 bits divided into five 300-bit sub frames. A data frame is broadcasted every thirty seconds. This technology can be used under many circumstances. It can be used in agriculture, navigation in land, sea and air, mapping and surveying, and for various military purposes (Misra and Enge, 2006).

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