APPROXIMATE GEODETIC DISTANCES

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# APPROXIMATE GEODETIC DISTANCES - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about ' APPROXIMATE GEODETIC DISTANCES' - dionne

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Presentation Transcript
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
• Approximate change in longitude
• Approximate length of a line
• Example
• Conclusion
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

l= Df . R

r2

Df

r1

Approx  - Spheroid

Spheroid

s= Df . rm

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
• Read appropriate module in study materials