International Feet vs. US Feet measurements

[Craig_Eissler_Iceman]

There seems to be several terms used to describe measurements in units of feet.

Is the "matching" chart below correct with respect to Int'l vs. U.S.?

"Imperial is the one that confuses me the most, because i read that the U.S. is the only country still using it. If so, why do we also have US Feet?

Thanks,

[AndrewLeason]

Craig,

The difference between International and US Survey Feet is that the international foot is defined as 0.3048 meters, whereas the US survey foot is 1200/3937 meters (or 0.30480061). However, earlier this year Congress retired the US survey foot as a unit of measure.

I hope this helps, Andrew.

[Craig_Eissler_Iceman]

Thanks for that info, but now I guess I have even more questions

If US Foot and Survey Foot are the same, then US Foot is being retired, as well?

And, what about my Imperial question?

[AyanPalit]

@Craig_Eissler_Iceman Great question! Looks like you have screenshots from ArcGIS documentation - always helpful if you include the reference link. 

Anyway, if your focus is Feet, there are just two:

1 International foot = 0.3048 meters

1 US survey foot = 0.3048006096 meters

The two federal agencies, National Institute of Standards and Technology (NIST) and National Oceanic and Atmospheric Administration (NOAA) retired use of the “U.S. survey foot” on December 31, 2022.

Reference: https://www.noaa.gov/stories/thinking-on-our-feet-december-31-marks-end-of-us-survey-foot

US survey units are based on imperial units (British) and sometimes used interchangeably. As noted above there may be a slight difference between specific US survey units and its corresponding imperial units.   

Reference: https://pro.arcgis.com/en/pro-app/latest/help/editing/distance-formats-for-editing.htm 

[Craig_Eissler_Iceman]

Yes, but what about answering my question with the different results using the same unit of measure?

[AyanPalit]

@Craig_Eissler_Iceman It will help if you provide specific links, tools and version of ArcGIS Pro being used.

Note that, ArcGIS Pro didn’t differentiate between the two distinct foot definitions previously and this was updated in ArcGIS Pro 3.0. 

[Craig_Eissler_Iceman]

I am NOT using two different units of measure. Both are being calculated using NAD83 State Plane, Texas Central, Feet. 

[rzufelt]

Perhaps you should actually 'post' that question...

R_

[Craig_Eissler_Iceman]

I did in another Post, but the person replying brought it to this Post, so then things got tangled up.

[Craig_Eissler_Iceman]

And, there are not just 2 "terms", there are 5 -- and I am attempting to associate them with the 2 you mention. ...All of the terms below are used in ArcGIS, so it's confusing which are synonymous.

International Foot
US Foot

(AND)

Feet
Survey Feet
Imperial