When Ellipsoidal Heights Will Do the Job, Why Look Elsewhere!

Abstract

In Today’s world, with GPS, we can survey ellipsoidal heights (h) directly with 5-10 cm accuracy for geodetic control points and differential heights (∆h) between well defined topographic features with relative accuracy of 1: 1Million or better. This type of height information will be sufficient to contour the Earth’s real topography on “no-projection ” maps and charts drawn on ellipsoidal surface. Instead of using Mean Sea Level or geoid as zero reference surfaces, the ellipsoid depths or heights referenced to time-invariant ellipsoid as zero reference will ensure safe marine and air navigation worldwide. This paper explains and provides important details how the ellipsoidal height “h ” and/or “∆h ” will work in non-engineering applications. It also includes simple algorithm(s) or procedural steps to get the best results in using ellipsoidal heights and/or depths.

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