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 (altitude) above, and depression (depth) below, mean sea level (MSL).
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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 (altitude) above, and depression (depth) below, mean sea level (MSL).
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The Sea Level Datum of 1929 wa ...... tinued to use the older datum.
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The Sea Level Datum of 1929 wa ...... ) below, mean sea level (MSL).
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Sea Level Datum of 1929
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