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18. Why is Geoid18 of note in surveying? (a) It is potentially the last hybrid geoid model produced by NGS (b) ground gravity measurements no

18. Why is Geoid18 of note in surveying? (a) It is potentially the last hybrid geoid model produced by NGS (b) ground gravity measurements no longer exist due to airborne gravity measurements (c) short vector lengths from a VRS control station enhanced the data (d) no GPS benchmarks were required in its generation

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