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Cache radar tile images with a Service Worker 
public/sw.js: network-falling-back-to-cache for RainViewer radar tile
requests specifically (nothing else — the app itself is served by the
same local server that's already the offline resource in the van, so
there's no app-shell to precache). Registered from layout.erb, a no-op
where it can't register (insecure context) rather than an error.

Verified: registers and controls the page, tiles get cached on a
normal fetch, cache.match() correctly retrieves them by the same
request. CDP's network-blocking simulation doesn't interact cleanly
with Service Worker fetch interception (a known tooling quirk, not
specific to this), so the actual offline fallback path is the
standard try/catch pattern, verified by code review rather than a
simulated-offline screenshot.
2026-09-09 09:51:29 +02:00

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TODO — implementation ideas

Ideas for offline use in a camper van. Implement incrementally, grouped by topic.

The local server has access to both the vehicle’s hardware and offline data — the vision is to grow it into a complete offline control center: resources, data, and independence from connectivity.

Offline data and cartography

  • ❏ Offline vector tiles (PMTiles/MBTiles) for Europe/world via Planetiler or MapTiler

  • ✓ Shaded relief / DEM layer — hillshade toggle in the sidebar, sourced from public Terrarium tiles online; reads data/terrain.pmtiles for offline if one’s been generated (see docs/development.adoc), otherwise the toggle is online-only for now

    • ❏ Terrain slope readout for parking (numeric, not just visual shading)

  • ❏ Contour lines from OSM for hikes and mountain passes

  • ❏ Overpass/OSM scripts to extract POIs (drinking water, dump stations, LPG, public toilets, laundromats, shops, springs)

  • ❏ Import Park4Night / iOverlander / Freecampsites data

  • ❏ Kiwix/ZIM offline Wikipedia linked to POI GPS coordinates

  • ✓ Cache weather forecast when temporarily connected — Open-Meteo 3-day forecast in the Radar flyout, last successful fetch cached in localStorage as a fallback when offline

    • ✓ Cache the radar tile images too — public/sw.js, network-falling-back-to-cache for RainViewer tile requests, registered from layout.erb

NPS visual style

  • ❏ Map Park4Night/OSM place types to NPS pictograms (campground, primitive camp, drinking water, dump station, viewpoint, picnic table) for instant recognition without reading text

  • ❏ Restyle popovers, side panels, and point detail views after the NPS Unigrid layout system (Massimo Vignelli) with Frutiger/Rawlinson Roadside-style typography

    • ✓ Top black banner (full width): "MAPTOOL" on the left, live map-center coordinates in the center, offline-data status dot on the right, white sans-serif type — DEM elevation and a hamburger menu skipped (no DEM layer yet; sidebar isn’t mobile-collapsed, so nothing for a hamburger to reveal)

    • ❏ Point detail/sidepanel: black header banner with white location name and an NPS pictogram in the corner; amenities (water, waste, power, slope) shown as a pictogram grid, no extra text; action buttons for "route here" (Valhalla), "start leveling", "save offline"

    • ✓ Filter panel as a "Unigrid Matrix" — an icon grid to toggle categories on/off, styled like the legend on an official NPS paper map, instead of plain dropdowns

  • ❏ Custom vector style (MVT/MapLibre) using the NPS color palette — muted natural tones for forests, water, and contours — so POIs and routes stand out at high zoom

    • ❏ Landuse & protections: distinct styling for national parks, nature reserves (translucent green/gray-green), military zones, and private land (important for wild camping)

    • ✓ Elevation-tinted terrain — a color-relief layer (hypsometric tint, this app’s own green→brown→gray palette) under the hillshade layer, same "Terrain shading" toggle

    • ✓ Road hierarchy: clearly distinguish paved roads from unpaved/gravel/track — critical for knowing if the camper can get there

Main menu reorganization (4 modules)

  • ❏ Explorer: place filters (Park4Night + OSM layers: water, waste, LPG, showers); map layers (contours, hillshade, satellite cache)

  • ❏ Navigation & route: offline router (Valhalla) with vehicle dimensions (height, weight, width); route elevation profile and isochrones

  • ❏ Offline hub: manager for downloaded PMTiles (country vector maps); downloaded Wikipedia archives; cached radar and weather

  • ❏ Camper & HW: level gauge (wheel-chock leveling); solar calculator (sun path on the map); telemetry (Victron / Home Assistant)

Custom layers & data

  • ✓ GPX/GeoJSON drag-and-drop import (Wikiloc, Komoot, own GPX tracks — also FIT), auto-styled by category with a generated elevation profile — KML not supported (only GPX/FIT/GeoJSON/.zip)

  • ❏ User overlay: offline drawing of custom points/polygons with notes (e.g. "turning space for a long vehicle", "narrow gate", "good swimming spot")

  • ❏ Offline satellite tile caching (e.g. ESRI) for a selected route area — key for judging surface quality and obstacles when wild camping

Nice to have (later)

Deprioritized for now — revisit after the sections above land.

Vanlife features

  • ❏ Offline routing (Valhalla/OSRM) with vehicle parameters (height, weight, width)

  • ❏ Solar calculator — sun path for location/date, shadows from surroundings, camper orientation

HW integration

  • ❏ Level gauge from IMU (ESP32/RPi) — camper tilt, wheel-chock leveling calculation

  • ❏ Victron/Home Assistant via MQTT or WebSocket — battery SoC, tank levels, temperatures

  • ❏ Plot GPS track with historical battery/speed data

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