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- Q7325529 subject Q6445680.
- Q7325529 subject Q8482451.
- Q7325529 subject Q8826767.
- Q7325529 subject Q8939667.
- Q7325529 subject Q8940505.
- Q7325529 abstract "The Sea Level Datum of 1929 was the vertical control datum established for vertical control surveying in the United States of America by the General Adjustment of 1929. The datum was used to measure elevation (altitude) above, and depression (depth) below, mean sea level (MSL).Mean sea level was measured at 26 tide gauges: 21 in the United States and 5 in Canada. The datum was defined by the observed heights of mean sea level at the 26 tide gauges and by the set of elevations of all bench marks resulting from the adjustment. The adjustment required a total of 66,315 miles (106,724 km) of leveling with 246 closed circuits and 25 circuits at sea level.Since the Sea Level Datum of 1929 was a hybrid model, it was not a pure model of mean sea level, the geoid, or any other equipotential surface. Therefore, it was renamed the National Geodetic Vertical Datum of 1929 (NGVD 29) in 1973. NGVD29 was superseded by the North American Vertical Datum of 1988 (NAVD 88), based upon an equipotential definition and a readjustment, although many cities and U.S. Army Corps of Engineers projects with established data continued to use the older datum.".
- Q7325529 wikiPageExternalLink www.ngs.noaa.gov.
- Q7325529 wikiPageExternalLink NGS_Glossary.xml.
- Q7325529 wikiPageExternalLink vert_con.prl.
- Q7325529 wikiPageExternalLink www.usgs.gov.
- Q7325529 wikiPageWikiLink Q1049334.
- Q7325529 wikiPageWikiLink Q121742.
- Q7325529 wikiPageWikiLink Q125465.
- Q7325529 wikiPageWikiLink Q131089.
- Q7325529 wikiPageWikiLink Q1335878.
- Q7325529 wikiPageWikiLink Q134435.
- Q7325529 wikiPageWikiLink Q1502887.
- Q7325529 wikiPageWikiLink Q16.
- Q7325529 wikiPageWikiLink Q185969.
- Q7325529 wikiPageWikiLink Q190200.
- Q7325529 wikiPageWikiLink Q190429.
- Q7325529 wikiPageWikiLink Q1967252.
- Q7325529 wikiPageWikiLink Q2633778.
- Q7325529 wikiPageWikiLink Q30.
- Q7325529 wikiPageWikiLink Q3175077.
- Q7325529 wikiPageWikiLink Q6445680.
- Q7325529 wikiPageWikiLink Q7053896.
- Q7325529 wikiPageWikiLink Q816425.
- Q7325529 wikiPageWikiLink Q8482451.
- Q7325529 wikiPageWikiLink Q8826767.
- Q7325529 wikiPageWikiLink Q8939667.
- Q7325529 wikiPageWikiLink Q8940505.
- Q7325529 comment "The Sea Level Datum of 1929 was the vertical control datum established for vertical control surveying in the United States of America by the General Adjustment of 1929. The datum was used to measure elevation (altitude) above, and depression (depth) below, mean sea level (MSL).Mean sea level was measured at 26 tide gauges: 21 in the United States and 5 in Canada.".
- Q7325529 label "Sea Level Datum of 1929".