approximate geodetic distances
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APPROXIMATE GEODETIC DISTANCES. Objectives. After this lecture you will be able to: Calculate approximate azimuth and lengths of lines from Df and Dl . Calculate approximate Df and Dl from azimuth and lengths of lines. Lecture Outline. Introduction Approximate change in latitude

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Presentation Transcript
objectives
Objectives

After this lecture you will be able to:

  • Calculate approximate azimuth and lengths of lines from Df and Dl.
  • Calculate approximate Df and Dl from azimuth and lengths of lines.
lecture outline
Lecture Outline
  • Introduction
  • Approximate change in latitude
  • Approximate change in longitude
  • Approximate length of a line
  • Example
  • Conclusion
introduction
Introduction
  • Need to calculate approximate change in latitude and longitude from azimuth and distance
    • Estimate coordinates as a check
    • Seed accurate calculations
  • Also need approximate reverse calculation
    • Approximate direction and distance
approx sphere
Approx  - Sphere

Sphere radius = R

l= Df . R

approx spheroid

r2

Df

r1

Approx  - Spheroid

Spheroid

s= Df . rm

conclusion
Conclusion

You can now:

  • Calculate approximate azimuth and lengths of lines from Df and Dl.
  • Calculate approximate Df and Dl from azimuth and lengths of lines.
self study
Self Study
  • Read appropriate module in study materials
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