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| Data Bases containing heights referenced to NGVD 29
will have to be |
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| updated to NAVD 88 |
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| › | Depending upon the accuracy required, in many areas
a Bias Factor could |
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| be used for
bench marks not included in the readjustment |
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| › | In “Moving” areas a Bias Factor probably will not be
sufficient for most |
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| applications |
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