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Updated definition of US survey units to reflect the 2022 revision by NIST/NGS #1920

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Updated definition of US survey units to reflect the 2022 revision by NIST/NGS #1920

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Updated definition of US survey units to reflect the 2022 revision by…
jacob-indigo Jan 11, 2024
5385a54
Fix whitespace
jacob-indigo Jan 11, 2024
c1f76e3
Updated sources
jacob-indigo Jan 12, 2024
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2 changes: 1 addition & 1 deletion CHANGES
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Expand Up @@ -4,7 +4,7 @@ Pint Changelog
0.24 (unreleased)
-----------------

- Nothing changed yet.
- Updated definition of US survey units to reflect the 2022 revision by NIST/NGS


0.23 (2023-12-08)
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36 changes: 22 additions & 14 deletions pint/default_en.txt
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Expand Up @@ -538,23 +538,31 @@ neper = 1 ; logbase: 2.71828182845904523536028747135266249775724709369995; logfa
cubic_yard = yd ** 3 = cu_yd
@end

# Note: historically, many of the units in this group were derived from each other (e.g. 1 chain = 10 fathoms = 4 rods = 100 links)
# but we've followed the NIST's lead here and defined all of the units directly based on "common" units (feet and miles)
# Source: Warfield, L. , Konijnenburg, J. , Lippa, K. , Lee, G. , Minnich, L. and Williams, J. (2023), Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices as adopted by the 108th National Conference on Weights and Measures, Handbook (NIST HB), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.HB.44-2024 (Accessed January 12, 2024)
@group USCSLengthSurvey
link = 1e-2 * chain = li = survey_link
survey_foot = 1200 / 3937 * meter = sft
fathom = 6 * survey_foot
rod = 16.5 * survey_foot = rd = pole = perch
chain = 4 * rod
furlong = 40 * rod = fur
cables_length = 120 * fathom
survey_mile = 5280 * survey_foot = smi = us_statute_mile
league = 3 * survey_mile

square_rod = rod ** 2 = sq_rod = sq_pole = sq_perch
acre = 10 * chain ** 2
square_survey_mile = survey_mile ** 2 = _ = section
cables_length = 720 * foot
chain = 66 * foot = ch
fathom = 6 * foot
furlong = 660 * foot = fur
league = 3 * mile
link = 0.66 * foot = li = survey_link
rod = 16.5 * foot = rd = pole = perch

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Please keep the order from small to big length unit to make diffs simpler to follow

square_rod = rod ** 2 = sq_rd = sq_rod = sq_pole = sq_perch
acre = 43560 * square_foot
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You could leave it as is was to minimize diffs. acre = 10 * chain ** 2

square_league = league ** 2
acre_foot = acre * foot = _ = acre_feet
@end

acre_foot = acre * survey_foot = _ = acre_feet
# The adoption of the international foot in 1959 temporarily permitted the continued use of the 1893 definition of the foot for survey purposes.
# That established the Survey Foot. After 2022, that exception was no longer permitted and all feet are feet (survey or otherwise).
# Source: Barton, J. , Blackwell, B. , Butcher, T. , Harshman, R., Lee, G. , Olson, D. (2019), Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices as adopted by the 108th National Conference on Weights and Measures 2019, Handbook (NIST HB), National Institute of Standards and Technology, Gaithersburg, MD, [online], h: https://doi.org/10.6028/NIST.HB.44-2020 (Accessed January 12, 2024)
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Here is an extra h: before the doi-link.

@group USCSLengthSurveyMendenhall
survey_foot = 1200 / 3937 * meter = sft
survey_mile = 5280 * survey_foot = smi = us_statute_mile
square_survey_mile = survey_mile ** 2
@end

@group USCSDryVolume
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