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| Detection and Removal of height errors due to
blunders |
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| Minimization of effects of systematic errors in
leveling data |
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| Replacement of both NGVD 29 and IGLD 55 with a
single datum |
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| Remonumentation and incorporation of 80,000 km of
new leveling |
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| data not previously adjusted to NGVD 29 |
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| Orthometric Heights compatible with GPS-Derived
Orthometric |
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| Heights computed using the High-Resolution Geoid
Model called |
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| Geoid99 |
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