Survey Foot vs. International Foot

July 21, 2008
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Posted By Loyal Olson on 7/20/2008 at 12:16 PM
 
The variance between the US Survey Foot and International Foot comes up from time to time here on the board, and the origins of the issue have been well documented here in the past.
 
Be that as it may, I recently gave a brief talk in Utah about some new County Coordinate Systems, and JB Stahl jumped up and asked my WHY I had selected the US Survey Foot for these systems. My off the cuff answer was something like "because that's what I ALWAYS use!"
 
Now to my question for the board:
 
Back "in the day" ALL of the EDM instruments that I used measured either in metres (only) or metres/feet (selectable), and with the exception of the AGA Geodimeter Models 76 & 78, the selectable units (that I used) ALL returned US Survey Feet. The AGA M76 & M78 returned International Feet.
 
What is the situation TODAY with the new instruments?
 
YEAH, yeah, yeah... It's only a couple of parts per million, and very few folks measure more than a mile or so with EDMs anymore, but it does raise hell with coordinate projection computations.
 
I KNOW that some States have adopted the International Foot for NAD83 State Plane Coordinate conversions, BUT does that mean that folks in those States have also adopted the International Foot?
 
Thanks in advance,
Loyal
Modified By Loyal Olson on 7/20/2008 at 12:16 PM
 

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