See how hilly a hand-drawn route is BEFORE riding it.
- parseRouteGPX reads <ele>; GPS.routeElevStats computes cumulative distance,
grade-to-next, ascent/descent (1m hysteresis) and max grade over smoothed
elevations (filterAndSmoothAlt kills SRTM vertical noise).
- Route preview screen (tap a route name): map with a wide colored casing +
tappable altitude/grade points, elevation profile chart (steep >8% in red),
length/ascent/descent/max-grade, fullscreen expand/collapse.
- Casing colored by slope (deg: lime <2, yellow 2-4, red 4-6, black >6) or by
elevation (green->yellow->brown), toggled with an on-map ∡/⛰ button. Casing
drawn in a dedicated pane below the overlay pane, so a recorded track stays on
top; the same toggle is on the track-detail map too.
- fetchElevations tries, in order: GPXZ (Copernicus GLO-30, key from GPS
settings — stored in localStorage, never in git) -> open-elevation (SRTM) ->
open-meteo -> OpenTopoData (keyless). Import auto-fetches elevations.
- db.js: updateRoutePoints persists fetched elevations into points_json;
getRoutes reports hasEle. Route points are now {lat, lon, ele?}.
Native prompt at route import replaced with in-app appPrompt.