Explain the basic principle of EDM devices June July 2011 Dec13Jan14

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Data-structure-with-C-10CS35-unit-2-->View question

Asked by:Nikhil-bharadwaj

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 Positions are a fundamental element of geographic data. Sets of positions form features, . Positions are
produced by acts of measurement, which are susceptible to human, environmental, and instrument errors.
Measurement errors cannot be eliminated, but systematic errors can be estimated, and compensated for.
Land surveyors use specialized instruments to measure angles and distances, from which they
calculate horizontal and vertical positions. The Global Positioning System (and to a potentially
greater extent, the emerging Global Navigation Satellite System) enables both surveyors and
ordinary citizens to determine positions by measuring distances to three or more Earth-orbiting
satellites. As you've read in this chapter (and may known from personal experience), GPS
technology now rivals electro-optical positioning devices (i.e., "total stations" that combine optical
angle measurement and electronic distance measurement instruments) in both cost and performance.
This raises the question, "If survey-grade GPS receivers can produce point data with sub-centimeter
accuracy, why are electro-optical positioning devices still so widely used?" 

Answerd By:manjarimattur

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