CSIR (Council of Scientific & Industrial Research) Earth Sciences Applied Geology-Remote Sensing and GIS Study Material (Page 10 of 101)

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Global Positioning Systems (GPS)

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Introduction

  • The Global positioning system (GPS) is a satellite-based navigation system, developed by U. S Division of Defense (DoD) in the 1970s. It is the constellation of 24 signal transmitting satellites in 6 near-circular orbits at an altitude of 20200 km. The angle of inclination of the orbits is 55 degree to the equatorial plane a…

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GIS- Data Structure

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Introduction

  • A ‘Data model’ is a collection of concepts or notations that organizes elements of data and standardizes how they relate one another and to the entities of the real-world. The way data is generally organized in a database management system is sometimes called a database model.
  • In GIS, spatial data model represents the features of real-world such as roads, land use, elevation, trees, waterways etc. in …

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