Oblique Mercator Introduction to Oblique Mercator Oblique Mercator is useful for flying specified great circle routes A datum great circle called false equator is taken as the parallel of tangency Scale is within 1% error up to 480 NM on either side of the Datum Great Circle Scale expansion is constantly equal to the secant of distance from datum great circle The projection is orthomorphic since the scale expansion same in all directions and Meridians and parallels cut at right angles Properties of Oblique Mercator Meridians and parallels are complex…
Category: General Navigation
Basics of Air Navigation is called General navigation. In thsi section, you can learn General Navigation required for DGCA Examinations.
Transverse Mercator Projection
Transverse Mercator Introduction to Transverse Mercator Transverse Mercator is useful for mapping countries or air-routes with large north-south extent Unlike Normal Mercator, a meridian is selected as the parallel of tangency Scale of Transverse Mercator is correct in a vertical band of 480 NM either side of the datum meridian Scale expansion in all directions is proportional to secant of angular distance from datum meridian Transverse Mercator is orthomorphic projection, since it meets the two requirements for orthomorphism Scale expansion same in all directions around a point and meridians and…
Mercator Cylindrical Projection
Normal Mercator Projection Introduction to Mercator Cylindrical Projection Mercator modification equalised the North-South and East-West scale expansion making it orthomorphic Scale expansion of a Mercator chart in the the North-South and East-West is proportional to secant latitude Scale at Any Latitude = Scale (Equator) x Secant Latitude Mercator is a Non-Perspective Orthomorphic Cylindrical projection Scale Expansion and Orthomorphism of Mercator Charts Large Areas and High Latitudes distorts shape of natural features in a Mercator Chart Chart convergence is zero everywhere making it correct only at equator but constant throughout the…