1938
DOI: 10.1029/tr019i001p00051
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The sea‐level datum of 1929

Abstract: Precise or first‐order leveling, as it is now called, was first undertaken by the United States Coast and Geodetic Survey in 1878 when field‐work was begun on the line of levels of high precision which was to follow the general trend of the Transcontinental Arc, an arc of triangulation extending across the United States from Chesapeake Bay to the Golden Gate and following approximately the 39th parallel. From this single‐line beginning, the control‐leveling of the Survey has been extended until the fundamental… Show more

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“…The vertical difference between NGVD 29 and the North American Vertical Datum of 1988 (NAVD 88, the datum used in this study) within the study area is typically about 1.1 m (plus or minus [±] 0.05 m; National Oceanic and Atmospheric Administration, 2020); therefore, a constant correction (plus [+] 1.1 m) was applied to all 1926 profile elevations to adjust to the NAVD 88 datum. Further shifting elevations to account for the difference from the older MSL datum in use at the time of creation of the 1926 map (MSL likely referencing the General Adjustment of 1912) to NGVD 29 would likely result in an adjustment of about 0.15 m or less (Rappleye, 1932). This additional vertical adjustment is challenging to determine and likely within the uncertainty introduced by unknown survey error and unknown streamflow at the time of the 1926 survey relative to comparison datasets.…”
Section: Plan and Profile Maps From 1926mentioning
confidence: 99%
“…The vertical difference between NGVD 29 and the North American Vertical Datum of 1988 (NAVD 88, the datum used in this study) within the study area is typically about 1.1 m (plus or minus [±] 0.05 m; National Oceanic and Atmospheric Administration, 2020); therefore, a constant correction (plus [+] 1.1 m) was applied to all 1926 profile elevations to adjust to the NAVD 88 datum. Further shifting elevations to account for the difference from the older MSL datum in use at the time of creation of the 1926 map (MSL likely referencing the General Adjustment of 1912) to NGVD 29 would likely result in an adjustment of about 0.15 m or less (Rappleye, 1932). This additional vertical adjustment is challenging to determine and likely within the uncertainty introduced by unknown survey error and unknown streamflow at the time of the 1926 survey relative to comparison datasets.…”
Section: Plan and Profile Maps From 1926mentioning
confidence: 99%