Did You Know?

[wfberry]

The National Institute of Standards and Technology and the National Geodetic Survey (NGS), National Ocean Service (NOS), National Oceanic and Atmospheric Administration (NOAA), Department of Commerce (DOC) announces a decision to deprecate the use of the “U.S. survey foot” on December 31, 2022. 

Just wondering if any of my USA constituents have been following this?

Bill

[Neilw_05]

I have not had a need to use data from that source so I don't know if the state has done any work in getting it into Int'l Feet. However the fact that it has set the standard implies that any data that is hosted by the state should eventually become available in the proper units. That is a good thing for users of public data. Once the standard becomes nationwide, the process of integrating data from public sources will be seamless. It will take some time to get there of course.

[Joe-Bouza]

thanks thats a keeper

[wfberry]

It can't be more accurate. All GPS is measured in one big Cartesian system and then transformed into whatever system you're using (within the limits of the program).

Allen at this time do not try to over-think it at this point.  ALL State Plane Coordinate Systems will be under the new sytem:

To this end, NGS will establish the State Plane Coordinate System of 2022 (SPCS2022), which will replace SPCS 83, the version referenced to NAD 83.

Bill

[AllenJessup]

I did some more reading overnight. One thing I noticed was the the Acre is based on the US Survey foot. So, although I didn't find any mention of it, I'd assume that the Acre will have to be redefined.

Now for the average holding of a few acres. That's not going to make a difference anyone will notice. Since I don't know exactly what the new definition will be. I can't calculate at what point the difference will become noticeable. Probably only on very large holdings like mega-farms and large ranches. But I'm sure that at some time or another some Surveyors are going to have to explain to a landowner or their attorney why the acreage has changed. 

[_Hathaway]

The adjustment is the difference between the US Survey foot which is defined as: 1200/3947 meters while the International foot is exactly 0.3048 meters. I'd be willing to bet those states working currently in International feet are not reporting acreage in US Survey Feet. I don't see acreage variations due to the shift to the international foot being an issue at all. It's definitely at the very bottom of my list of concerns once the new rule hits.

[AllenJessup]

Oh. I'm not worried. I view this more as a thought experiment or whatever you want to call it. I know it's very unlikely to affect things on the ground. However...

SI definitions are changing. If the Meter is redefined that will redefine the foot. The "exact equivalents for the foot that will be adopted after December 31, 2022 will be published near to this date". All of this is more for scientific measurement where the constants are still being measured against a chunk of platinum. We're just going to experience a small bit of fallout from it. I'm confident that by the time this is adopted. Civil 3D and other programs will have been updated to handle it.

But I'm not going to dump Corpscon 6 any time soon.