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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

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.

• Introduction

• Approximate change in latitude

• Approximate change in longitude

• Approximate length of a line

• Example

• Conclusion

• 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

Sphere radius = R

l= Df . R

r2

Df

r1

Approx  - Spheroid

Spheroid

s= Df . rm

Approx  - Spheroid

Approx  - Spheroid

Approx 

Approx 

Approx 

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.

• Read appropriate module in study materials