Question

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Different ones of these reference frames use different reference ellipsoids for the earth’s shape, so local ones remain more accurate than the WGS 84 geodetic standard used in GPS. For 10 points each:
[10m] Name these references that are used as standards in order to describe other points on the earth, which can be “horizontal” or “vertical” depending on use for marking surface position or elevation.
ANSWER: datums [or datum references; accept any specific type of datum; reject “data”] (The plural of “datum” is “datums” explicitly to avoid confusion with “data.”)
[10e] Vertical datums are often set to a particular location’s value for this standard. Altitude and elevation are typically reported in distance above or below this standard.
ANSWER: mean sea level
[10h] On nautical charts, the chart datum is typically based not on mean sea level but on this tidal datum, which averages the elevation of the lowest tide each day.
ANSWER: mean lower-low water [or MLLW; reject “mean low water” or “MLW”]
<Geography - Geography>

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Summary

2024 ARGOS @ Brandeis03/22/2025Y310.00100%0%0%
2024 ARGOS @ Chicago11/23/2024Y611.67100%17%0%
2024 ARGOS @ Christ's College12/14/2024Y313.33100%33%0%
2024 ARGOS @ Columbia11/23/2024Y313.33100%33%0%
2024 ARGOS @ McMaster11/17/2024Y510.00100%0%0%
2024 ARGOS @ Stanford02/22/2025Y310.00100%0%0%
2024 ARGOS Online03/22/2025Y310.00100%0%0%

Data

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