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36 FGDC Vertical datum topics matching:
Filter this Collection| x name | x image | x article |
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| x Sea Level Datum of 1929 |
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 or altitude above, and depression or...
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| x North American Vertical Datum of 1988 |
The North American Vertical Datum of 1988 (NAVD 88) is the vertical control datum established for vertical control surveying in the United States of America based upon the General Adjustment of the North American Datum of 1988.
The NAVD 88 was...
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| x Local surface | ||
| x Chart datum |
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A chart datum is the level of water that charted depths displayed on a nautical chart are measured from. A chart datum is generally a tidal datum; that is, a datum derived from some phase of the tide. Common chart data are lowest astronomical tide...
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| x Lowest astronomical tide | ||
| x Highest astronomical tide | ||
| x Mean low water | ||
| x Mean high water | ||
| x Mean sea level | ||
| x Land survey datum | ||
| x Mean low water springs |
The mean low water spring is the lowest level to which spring tides retreat on the average over a period of time (often 19 years).
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| x Mean high water springs |
The mean high water spring is the highest level to which spring tides reach on the average over a period of time (often 19 years). This level is generally close to being the "high water mark" where debris accumulates on the shore annually.
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| x Mean low water neap | ||
| x Mean high water neap | ||
| x Mean lower low water | ||
| x Mean lower low water springs | ||
| x Mean higher high water | ||
| x Mean higher low water | ||
| x Mean lower high water | ||
| x Spring tide | ||
| x Tropic lower low water | ||
| x Neap tide | ||
| x High water | ||
| x Higher high water | ||
| x Low water | ||
| x Lowest low water | ||
| x Lower low water | ||
| x Lowest normal low water | ||
| x Mean tide level | ||
| x Indian spring low water | ||
| x High-water full and charge | ||
| x Low-water full and charge | ||
| x Columbia River datum | ||
| x Equatorial springs low water | ||
| x Approximate lowest astronomical tide | ||
| x Gulf Coast low water datum | ||
