CMU Water Center marked the October 2024 high-water line at ~4,900 places in
Chiang Mai and Lamphun (depth above the road while P.1 stood at 5.30 m).
- src/static/flood-marks-2024.json (position and depth, 110 KB), built by
scripts/build_flood_marks.py from CMU's GeoJSON.
- "Flood marks 2024" layer: canvas dots from zoom 12 in CMU's five depth
classes, legend row, CMU credit; turning it on below zoom 12 flies to the
city. A mark's popup gives the depth and its flood zone.
- Zone and marker popups name the nearest mark within 250 m (loaded with the
zones).
- No depth estimate for other P.1 levels: the marks do not scale one-to-one
with P.1 (marks in the 5.30 m zone stood a median 65 cm deep in 2024).
- The layer bar wraps on narrow maps; popups pan clear of it.
- Docs: DATA_SOURCES 5.1, DASHBOARD_REDESIGN, README.
