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| Improved set of heights on a single vertical datum
for North America |
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| Improved FGCS Leveling procedures with higher
production and |
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| lower error rates |
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| All NGS National Spatial Reference System data is
validated in a |
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| single data base, with easy access by users for
crustal motion studies, |
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| adjustments, latest official heights, and
descriptions |
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| Removal of height discrepancies caused by
inconsistent adjustment |
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| constraints |
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