Draw graticules on Polar Zenithal Stereographic Projection for an extension upto 60° S, interval – 15° , R.F 1:50,000,000.

Step 1
Radius of the reduced earth (R)
= 640,000,000 ÷ Denominator of R.F
= 640,000,000 ÷ 50,000,000
= 12.8 cms

Step 2
Radius of any parallel (ɸ) from the pole 2R Tan (90°- ɸ) / 2

ɸ (90° - ɸ)/2 Tan ( 90° - ɸ)/2 R in cms 2 R Log Tan (90° - ɸ)/2

90° S 0 0 25.6 0
75° S 75 0.13 25.6 3.370
60° S 15 0.27 25.6 6.859

свернуть