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Bill93

Neat picture

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This shows why NGS bothers to keep NAD83 distinct from WGS84. WGS84 is tied to the average of all the earth's motion. NAD83 is tied to the ground. The result is this annual change in WGS84 coordinates for a fixed point on the ground.

 

Note the scale in the upper left corner of the picture. The US has it easy compared to much of the world.

http://www.unavco.org/community_science/science-support/crustal_motion/dxdt/images/nuvel1a_nnr.gif

nuvel1a_nnr.gif

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Edit: Interesting bug in the Groundspeak software that I've noticed before: This thread showed 0 replies, 0 views. I was almost certain it had been viewed by SOMEBODY. I posted a reply and it jumped to 1 reply 58 views immediately.

Edited by Bill93

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Just read the segment in John McPhee's Basin and Range chapter in 'Annals of the Former World' stating that India moved at 22 centimeters per year when is headed north across the equator. MEL

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