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feat(weather): global rain radar from RainViewer
Add a Global (RainViewer) option to Rain radar beside the US MRMS radar. The proxy pins RainViewer's tile host, validates frames and Web Mercator tile coordinates, and limits upstream tile requests to 80 a minute. Globe basemaps draw the tiles; on 3D Tiles the shell composes them into one equirectangular image per frame and detail window. Co-authored-by: Sandiv Dathunarachchi <[email protected]>
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@@ -81,9 +81,10 @@ Status: Open (owner-accepted 2026-07-08, documented)
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### Weather layers: coverage and meaning
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Status: Open (source limits, by design)
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- **Rain radar covers the contiguous United States only.** It shows MRMS
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reflectivity in dBZ, not rainfall rate or a forecast; a gap in coverage does not
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mean no precipitation.
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- **Rain radar:** the US option is MRMS for the contiguous United States; the
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Global option is RainViewer’s composite where national radars exist, past
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2 hours only. Both show reflectivity in dBZ, not rainfall rate or a forecast;
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gaps are not “no rain”.
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- **Lightning density is a ground-network grid, not GLM flashes.** It is NOAA's
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15-minute density product derived from Vaisala NLDN/GLD360 on an approximately
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8 km grid, for the Americas and Pacific only (110°E across the dateline to 0°,
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