Special Topics - GPS (65 of 100) What is Reference Ellipsoid

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We will learn The Reference Ellipsoid is a mathematically derived surface that approximates the shape of the globe. It includes undulations of the Earth’s gravity due to variations of the composition and density. This allows us to find points on the Earth’s surface much more accurately.
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Or search title for other platforms: Special Topics - GPS (64 of 100) ECEF: Earth Centered Earth Fixed Coordinate System
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Or search title for other platforms: Special Topics - GPS (66 of 100) WGS 84 World Geodetic System

[@Nerd3927]

This is the GRS80 reference ellipsoid. Many local datums use an older one, like the Bessel 1841 for the Dutch RijksDriehoekstelsel.

[@MichelvanBiezen]

Yes indeed. Thank you for this very interesting comment. 🙂

[@henryrroland]

Where this (2a+b)/3 came from? I never saw it before... I thought that average was (a+b)/2
Why it can't find this representative R equaling the volume of a sphere and an ellipsoid? (We do that in irregular particles, like in bulk catalyst description)
4πabc/3 = 4πr³/3

[@MichelvanBiezen]

With an ellipse, the slope changes and the change of the slope is not a constant. To have a better approximation of the average orbital radius when the shape is an ellipse, it is better to use (2a+b)/3 (We are not trying to find the average value of 2 numbers a and b)

[@nurullahgurcan7396]

how can I find the rest of this lecture

[@MichelvanBiezen]

We are still working on them. We publish one new video on GPS every Thursday.

[@LHVMleodragonlamb]

ellipsoid makes me think of a mexican food product that can be rebranded to get cohesion in west coast. like pinata. theyre called huaraches and it is a dense corn paste that provides calcium sodium and carbs.

[@MichelvanBiezen]

Never saw that connection !

[@LHVMleodragonlamb]

money opp like automating robots w blood stabilizing food pastes

[@Falit_]

nice lectures professor

[@MichelvanBiezen]

Thank you. Glad you enjoyed it. 🙂

[@dlrmfemilianolako8]

Thanks professor

[@MichelvanBiezen]

You are welcome 🙂