[time-nuts] Re: Looking at ultra precise 50 km-100 km Electronic Distance Measurement.

[Hal Murray]

The USGS used to measure the distance between a couple of mountains in the Bay 
Area using laser ranging.  They were ballpark of 100km apart on opposite sides 
of much of the faulting in the area.  I took a quick google search and didn't 
find anything.  The part I remember is that they flew a helicopter along the 
path to measure temperature to correct the speed of light.

I think they currently use good GPS.

-- 
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