Observed arrival · 2026-09-21
Tidemark, a satellite’s second opinion for tide gauges
A research project compares SWOT satellite water-surface readings with Maine tide-gauge records to estimate an unsurveyed sensor’s elevation.
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◎Niche
◉Human
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- For
- Coastal monitoring researchers and flood-data practitioners
- Worth noticing
- The page models continuous gauge readings, per-pass satellite observations, and a flat carry-forward between passes.
Field notes
The homepage distinguishes two ways to establish a gauge’s elevation: a crew using high-precision survey equipment, or repeated satellite observations of the same water surface. It describes the gauge as measuring downward to the water every six minutes, while SWOT contributes readings only during overflights. The between-pass view carries the last satellite reading forward, making the temporal limitation explicit rather than hiding it.
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
◉HumanPersonal, local, civic, or handmade
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