Replace offline basemap pipeline with Planetiler, unify online/offline styling

Offline tiles were built from Protomaps' own basemap schema, needing a
completely separate hand-tuned theme (protomaps-themes-base + OFFLINE_THEME)
from the online Liberty style's ONLINE_STYLE_PATCH — the two could never be
made to match exactly no matter how much either side got tuned (today's
session found and fixed several mismatches: building opacity, park
boundaries, road casings, road widths).

Offline.pmtiles is now built with Planetiler's default OpenMapTiles profile
against Geofabrik per-country OSM extracts (osmium-merged when more than one
country is selected), the same vector schema Liberty already expects.
offlineStyle() now clones the same Liberty JSON (vendored as a local
snapshot for reliability with no internet) and applies the identical
ONLINE_STYLE_PATCH, just repointed at local PMTiles/glyphs/sprite — one
palette instead of two, correct on both sides by construction.

Also vendors Liberty's icon sprite for the first time (offline had none
before), adds Java/osmium-tool/planetiler.jar to the Docker image, and
removes the now-unused protomaps-themes-base dependency and the
theme-comparison debug page that found today's bugs.

public/js/map.js

@@ -28,29 +28,46 @@ const CENTER = [17.1077, 48.1486];
 const ZOOM = 13;
 const ONLINE_STYLE_URL = "https://tiles.openfreemap.org/styles/liberty";
 
-// Recolors OpenFreeMap Liberty to the same NPS-inspired palette as
-// OFFLINE_THEME below — warm cream ground, muted roads/boundaries — mapped
-// onto Liberty's OpenMapTiles layer ids instead of protomaps' theme roles
-// (the two schemas don't share layer names, so this is a separate
-// hand-built table, not a shared object). Only the layers that dominate the
-// map's overall color read are touched; labels, halos, rail, and minor
-// overlays (cemetery/hospital/school/pitch/track shading, building
-// outlines) are left at Liberty's own defaults — same "not a full
-// recolor" scope as OFFLINE_THEME. Road casings have no protomaps-role
-// equivalent to reuse (offline roads don't get a separate outline), so
-// #c9a66b there is reasoned to fit the family rather than sourced from
-// anywhere real.
+// Recolors OpenFreeMap Liberty to a warm, NPS-Park-Tiles-inspired palette —
+// cream ground, muted roads/boundaries — mapped onto Liberty's OpenMapTiles
+// layer ids. Applied identically regardless of which PMTiles data actually
+// backs the "openmaptiles" source (see offlineStyle() below): offline tiles
+// are built by Planetiler's own OpenMapTiles profile (docs/development.adoc),
+// the same schema Liberty already expects, so one patch serves both —
+// no separate offline theme/palette to keep in sync. Only the layers that
+// dominate the map's overall color read are touched; labels, halos, rail,
+// and minor overlays (cemetery/hospital/school/pitch/track shading,
+// building outlines) are left at Liberty's own defaults.
 //
-// wood/grass are deliberately left unpatched — Liberty's own green reads
-// better than this app's earlier brown/khaki recolor, and OFFLINE_THEME's
-// wood_a/scrub_a below were changed to match Liberty's green instead.
+// wood/grass are deliberately left unpatched — Liberty's own green (a
+// translucent landcover_wood/landcover_grass wash) already reads well over
+// the patched cream background.
 const ONLINE_STYLE_PATCH = {
   background: { "background-color": "#f9f6ef" },
+  // Liberty washes every built-up area in a translucent gray-tan below
+  // z12 (landuse_residential, maxzoom 12 — gone by this app's default
+  // z13) that the offline schema has no equivalent of; protomaps just
+  // leaves that ground as plain background/earth. Matched to background
+  // here rather than left alone, so a zoomed-out view doesn't read as
+  // visibly dingier online than offline.
+  landuse_residential: { "fill-color": "#f9f6ef" },
   landcover_sand: { "fill-color": "#f0e4c4" },
   water: { "fill-color": "#a3cedf" },
-  park: { "fill-color": "#b3e378" },
-  park_outline: { "line-color": "#546619" },
-  building: { "fill-color": "#ded7cc" },
+  // fill-outline-color isn't touched by a plain fill-color patch — Liberty
+  // draws it separately, defaulting to a bright green that reads as a
+  // distinct border around named conservation areas (e.g. the Malé
+  // Karpaty CHKO). Matched to the fill itself, and park_outline's own
+  // dashed line hidden below, so a reserve blends in as ordinary forest —
+  // offline has no equivalent stroke at all (see park_a/park_b below),
+  // and the point was never to call reserves out as visibly different,
+  // on either side.
+  park: { "fill-color": "#b3e378", "fill-outline-color": "#b3e378" },
+  park_outline: { "line-opacity": 0 },
+  // fill-opacity: 0.5 matches the offline theme's own "buildings" layer —
+  // without it, Liberty's dense individual building footprints (each with
+  // its own outline) paint fully opaque and read much heavier/grayer than
+  // offline's softer, half-transparent fill over the same cream ground.
+  building: { "fill-color": "#ded7cc", "fill-opacity": 0.5 },
   boundary_2: { "line-color": "#546619" },
   boundary_3: { "line-color": "#546619" },
 
@@ -58,19 +75,30 @@ const ONLINE_STYLE_PATCH = {
   // minor (residential/service/track), pedestrian — each repeated for its
   // tunnel_/bridge_ counterpart so a road doesn't change color when it
   // dips into a tunnel or crosses a bridge. Rail is left alone.
-  road_motorway: { "line-color": "#fdefbe" },
-  road_trunk_primary: { "line-color": "#fdefbe" },
-  road_secondary_tertiary: { "line-color": "#fef7dd" },
-  road_link: { "line-color": "#fef7dd" },
-  road_motorway_link: { "line-color": "#fef7dd" },
+  //
+  // line-width below is a flat number, not Liberty's own zoom-interpolated
+  // expression — picked to match the offline theme's actual rendered width
+  // at this app's default zoom (13; verified live via queryRenderedFeatures
+  // on both sides), since without it Liberty's own curve draws surface
+  // roads roughly twice as thick as offline at street level, reading as a
+  // much bolder road network online.
+  // ponytail: tuned for z13 only, not a matching curve across all zooms —
+  // will drift back apart at very different zoom levels. Upgrade path:
+  // sample offline's width at a few more zooms and replace with a matching
+  // ["interpolate", ["linear"], ["zoom"], ...] expression.
+  road_motorway: { "line-color": "#fdefbe", "line-width": 2.26 },
+  road_trunk_primary: { "line-color": "#fdefbe", "line-width": 2.26 },
+  road_secondary_tertiary: { "line-color": "#fef7dd", "line-width": 1.87 },
+  road_link: { "line-color": "#fef7dd", "line-width": 1 },
+  road_motorway_link: { "line-color": "#fef7dd", "line-width": 1 },
   road_minor: { "line-color": "#fffdf8" },
   road_service_track: { "line-color": "#fffdf8" },
   road_path_pedestrian: { "line-color": "#e9e2d8" },
-  road_motorway_casing: { "line-color": "#c9a66b" },
-  road_trunk_primary_casing: { "line-color": "#c9a66b" },
-  road_secondary_tertiary_casing: { "line-color": "#c9a66b" },
-  road_link_casing: { "line-color": "#c9a66b" },
-  road_motorway_link_casing: { "line-color": "#c9a66b" },
+  road_motorway_casing: { "line-color": "#c9a66b", "line-width": 1.48 },
+  road_trunk_primary_casing: { "line-color": "#c9a66b", "line-width": 1.48 },
+  road_secondary_tertiary_casing: { "line-color": "#c9a66b", "line-width": 1 },
+  road_link_casing: { "line-color": "#c9a66b", "line-width": 1.5 },
+  road_motorway_link_casing: { "line-color": "#c9a66b", "line-width": 1.5 },
   road_minor_casing: { "line-color": "#c9a66b" },
   road_service_track_casing: { "line-color": "#c9a66b" },
 
@@ -161,95 +189,45 @@ async function loadOnlineStyle() {
 
 const ONLINE_STYLE = await loadOnlineStyle();
 
+// A vendored copy of the same Liberty style ONLINE_STYLE fetches live
+// (public/vendor/liberty-style/liberty.json — a point-in-time snapshot, not
+// auto-updated) that offlineStyle() below patches+repoints the exact same
+// way. Offline mode can't depend on ONLINE_STYLE_URL actually being
+// reachable — that fetch failing/timing out is the normal case in the
+// field, not an edge case — so this is a local, same-origin fetch instead
+// (fast and always available, since it's served by this app itself).
+const OFFLINE_STYLE_TEMPLATE = await fetch("/vendor/liberty-style/liberty.json").then((response) => response.json());
+
 const protocol = new pmtiles.Protocol();
 addProtocol("pmtiles", protocol.tile);
 
-// Nudged from protomaps-themes-base's stock "light" theme towards the
-// National Park Service's own "Park Tiles" cartography — a warm,
-// Harpers-Ferry-Center-derived look. Not their actual map: a handful of
-// values below (marked) are the genuine paint colors pulled from a public
-// Park Tiles style JSON
-// (nps.gov/lib/npmap.js/style/ck72fwp2642dv07o7tbqinvz4.json, the "Imagery"
-// variant — the only one of their four styles served from a plain,
-// unauthenticated URL; "Standard"/"Slate"/"Light" resolve through Mapbox
-// Studio's private API with an access token, which isn't something to
-// piggyback on even though it's technically visible in their own JS bundle).
-// The rest are reasoned to match that same family (warm cream ground, olive
-// greens, muted blue) rather than sourced. Not a full recolor: labels,
-// casings, and roles with no clean real-color anchor are left at theme
-// defaults.
+// Builds the offline style from OFFLINE_STYLE_TEMPLATE — the identical
+// Liberty JSON + ONLINE_STYLE_PATCH recolor as the online map, just
+// repointed at a local PMTiles source instead of tiles.openfreemap.org.
+// This works because data/offline.pmtiles is now built by Planetiler's own
+// OpenMapTiles profile (see docs/development.adoc), the same vector schema
+// Liberty expects — before that, offline tiles used a different schema
+// (protomaps' own basemaps) needing a completely separate hand-tuned
+// theme (protomaps-themes-base + OFFLINE_THEME) that could never be made
+// to match ONLINE_STYLE_PATCH's look exactly, no matter how much either
+// side got tuned.
 //
-// Recreating the color choices is legitimate — that's not the kind of thing
-// a data license restricts (see docs/architecture.adoc's "Offline maps"
-// section) — what stays off-limits is their actual tile *service*: its
-// OSM/terrain layers are licensed through Mapbox Atlas, a commercial,
-// non-sublicensable data service scoped to NPS.
-const OFFLINE_THEME = {
-  ...protomaps_themes_base.namedTheme("light"),
-  background: "#f9f6ef", // real: Park Tiles' own background, hsl(40, 37%, 97%)
-  earth: "#f9f6ef",
-  water: "#a3cedf",
-  // Matches OpenFreeMap Liberty's own wood/grass green (its landcover_wood
-  // hsla(98,61%,72%,0.7) and landcover_grass rgba(176,213,154,1) at 0.3
-  // opacity, blended over the cream background) — the online map's actual
-  // look whenever ONLINE_STYLE_PATCH's brown/khaki recolor fails to apply
-  // (see loadOnlineStyle's fetch fallback) turned out to be the look this
-  // app's users actually want, so offline was changed to match it instead
-  // of chasing the patch's own reliability.
-  wood_a: "#c3e8ab",
-  wood_b: "#a8d888",
-  scrub_a: "#dcecc9",
-  scrub_b: "#cfe3b8",
-  // Close to wood_b, not the more saturated Park Tiles green: protomaps'
-  // theme routes "forest"/"nature_reserve"/"protected_area" (e.g. the Malé
-  // Karpaty CHKO boundary) through this same park_a/park_b pair as actual
-  // named parks — Liberty's online style doesn't make that reserve-boundary
-  // distinction at all, so a visibly different green here reads as an
-  // offline-only blotch rather than a deliberate distinction.
-  park_a: "#c3e8ab",
-  park_b: "#a8d888",
-  sand: "#f0e4c4",
-  beach: "#f0e4c4",
-  buildings: "#ded7cc",
-  pedestrian: "#e9e2d8",
-  highway: "#fdefbe", // real: Park Tiles' primary/highway road color
-  major: "#fef7dd", // real: Park Tiles' secondary road color
-  // "minor" (singular) is never actually read by protomaps' own paint
-  // expressions — only the zoom-interpolated minor_a/minor_b pair is, so a
-  // plain "minor" key here was dead: ordinary streets were silently
-  // falling back to the base theme's default pale yellow instead of this
-  // app's cream.
-  minor_a: "#fffdf8",
-  minor_b: "#fffdf8",
-  link: "#fef7dd",
-  // Distinct brown, not cream: protomaps' "other"/"path" kind is what a
-  // camper actually needs called out — unpaved tracks and footpaths,
-  // separate from paved minor_road/service (minor_service, left at the
-  // base theme's default since it's real driveways/parking aisles, not
-  // unpaved). Already rendered dashed by the theme itself; this just picks
-  // a real "dirt" tone instead of unstyled white.
-  other: "#c9a66b",
-  boundaries: "#546619", // real: Park Tiles' park-boundary line color
-};
-
+// glyphs/sprite point at vendored local copies (public/vendor/fonts,
+// public/vendor/liberty-sprite) rather than tiles.openfreemap.org's —
+// glyphs are Latin-only (see docs/architecture.adoc: labels in other
+// scripts won't render offline), sprite is a one-time snapshot like
+// OFFLINE_STYLE_TEMPLATE itself. ne2_shaded (Liberty's low-zoom shaded-
+// relief backdrop, z0-6 only) is left pointing at its remote URL
+// unchanged — offline usage is regional, not whole-earth zoomed out, so
+// this only ever silently fails to load at a zoom level offline users
+// aren't in, the same graceful-degradation story as this app's other
+// online-only extras (Wikipedia, live radar).
 function offlineStyle() {
-  const pmtilesUrl = `${window.location.origin}/tiles/offline.pmtiles`;
-
-  return {
-    version: 8,
-    glyphs: `${window.location.origin}/vendor/fonts/{fontstack}/{range}.pbf`,
-    sources: {
-      offline: {
-        type: "vector",
-        url: `pmtiles://${pmtilesUrl}`,
-        attribution: "© OpenStreetMap contributors",
-      },
-    },
-    // lang: "en" pulls in labels_layers (see docs/architecture.adoc) — only
-    // the Latin-script glyph ranges are vendored, so labels using other
-    // scripts won't render offline.
-    layers: protomaps_themes_base.layers("offline", OFFLINE_THEME, { lang: "en" }),
-  };
+  const style = patchOnlineStyle(structuredClone(OFFLINE_STYLE_TEMPLATE));
+  style.sources.openmaptiles.url = `pmtiles://${window.location.origin}/tiles/offline.pmtiles`;
+  style.glyphs = `${window.location.origin}/vendor/fonts/{fontstack}/{range}.pbf`;
+  style.sprite = `${window.location.origin}/vendor/liberty-sprite/ofm`;
+  return style;
 }
 
 // A sidebar icon that opens a full-height side panel (like the GPX one)

public/js/offline_data.js

@@ -37,13 +37,13 @@ function flagIconUrl(code) {
   return `/vendor/flag-icons/1x1/${code.toLowerCase()}.svg`;
 }
 
-// meta.source is a Protomaps build filename like "20260910.pmtiles" — the
-// leading 8 digits are its build date.
+// meta.sources is one entry per country the current build covers (see
+// lib/maptool/pmtiles_builder.rb) — listing the codes is more useful here
+// than a count, since they're exactly what RegionPicker's checklist above
+// already shows.
 function formatOfflineMeta(meta) {
   if (!meta) return "";
-  const match = meta.source.match(/^(\d{4})(\d{2})(\d{2})/);
-  const date = match ? `${match[1]}-${match[2]}-${match[3]}` : meta.source;
-  return ` · Protomaps ${date}`;
+  return ` · ${meta.sources.map((s) => s.code).join(", ")}`;
 }
 
 function formatTerrainMeta(meta) {
@@ -172,9 +172,9 @@ class DataFileRow {
   }
 
   // Separate from _refreshStatus's own fetch (and only called once, right
-  // after — not polled): this one reaches an external service (Protomaps'
-  // build index or Mapterhorn's manifest, see
-  // lib/maptool/pmtiles_builder.rb), so it's kept off the hot status path
+  // after — not polled): this one reaches an external service (Geofabrik
+  // or Mapterhorn's manifest, see lib/maptool/pmtiles_builder.rb), so it's
+  // kept off the hot status path
   // and just silently skipped if it fails, same as everywhere else this
   // app degrades gracefully when an optional network check doesn't answer.
   async _checkUpdate() {

public/theme_preview.html

@@ -1,111 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-<head>
-<meta charset="utf-8">
-<title>Offline theme preview</title>
-<link rel="stylesheet" href="/vendor/maplibre-gl/maplibre-gl.css">
-<style>
-  body { margin: 0; font-family: sans-serif; background: #222; }
-  .grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; }
-  .cell { position: relative; height: 90vh; }
-  .cell .map, .cell iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
-  .cell .label {
-    position: absolute; top: 4px; left: 4px; z-index: 1;
-    background: rgba(0,0,0,.6); color: #fff; padding: 2px 8px;
-    font-size: 13px; border-radius: 3px;
-  }
-</style>
-</head>
-<body>
-<div class="grid">
-  <div class="cell">
-    <div class="label">light (bare base theme)</div>
-    <div class="map" id="light-map"></div>
-  </div>
-  <div class="cell">
-    <div class="label">offline (current app)</div>
-    <iframe id="offline-frame" src="/"></iframe>
-  </div>
-  <div class="cell">
-    <div class="label">online (current app)</div>
-    <iframe id="online-frame" src="/"></iframe>
-  </div>
-</div>
-<script src="/vendor/pmtiles/pmtiles.js"></script>
-<script src="/vendor/protomaps-themes-base/protomaps-themes-base.js"></script>
-<script type="module">
-  import { Map as MaplibreMap, addProtocol } from "/vendor/maplibre-gl/maplibre-gl.mjs";
-
-  const protocol = new pmtiles.Protocol();
-  addProtocol("pmtiles", protocol.tile);
-
-  const CENTER = [17.1077, 48.1486];
-  const ZOOM = 13;
-  const pmtilesUrl = `${window.location.origin}/tiles/offline.pmtiles`;
-
-  const lightMap = new MaplibreMap({
-    container: "light-map",
-    center: CENTER,
-    zoom: ZOOM,
-    style: {
-      version: 8,
-      glyphs: `${window.location.origin}/vendor/fonts/{fontstack}/{range}.pbf`,
-      sources: {
-        offline: { type: "vector", url: `pmtiles://${pmtilesUrl}` },
-      },
-      layers: protomaps_themes_base.layers("offline", protomaps_themes_base.namedTheme("light"), { lang: "en" }),
-    },
-  });
-
-  // "offline" frame needs nothing: the app already defaults to its offline
-  // style whenever /api/offline-tiles reports data present (see map.js).
-  // "online" frame: click its own real Online button, same button a user
-  // would click — reuses the app's actual ONLINE_STYLE (patched Liberty)
-  // instead of re-fetching/re-patching a second copy here.
-  const offlineFrame = document.getElementById("offline-frame");
-  const onlineFrame = document.getElementById("online-frame");
-  const clickOnline = () => {
-    const button = onlineFrame.contentDocument?.querySelector('.basemap-panel__option[data-style="online"]');
-    if (button) button.click();
-  };
-  onlineFrame.addEventListener("load", () => {
-    clickOnline();
-    setTimeout(clickOnline, 1000); // retry once in case map.js was still mid-init
-  });
-
-  // Keep all three views looking at the same spot. The two iframes are the
-  // real app (separate documents, own module scope — nothing to reach into
-  // directly), but map.js already syncs its map to the URL hash (`hash:
-  // "map"`, format #map=zoom/lat/lon) for shareable links. Reusing that: poll
-  // each source's position, and whichever moved gets pushed to the other
-  // two — for a frame, by writing its location.hash, which fires its own
-  // hashchange and lets its Hash control jumpTo for us.
-  const HASH_RE = /map=([\d.]+)\/(-?[\d.]+)\/(-?[\d.]+)/;
-  function frameHash(frame) {
-    const match = HASH_RE.exec(frame.contentWindow?.location.hash ?? "");
-    return match ? { zoom: +match[1], lat: +match[2], lon: +match[3] } : null;
-  }
-  function lightPos() {
-    const c = lightMap.getCenter();
-    return { zoom: lightMap.getZoom(), lat: c.lat, lon: c.lng };
-  }
-  function samePos(a, b) {
-    return Math.abs(a.zoom - b.zoom) < 0.005 && Math.abs(a.lat - b.lat) < 1e-4 && Math.abs(a.lon - b.lon) < 1e-4;
-  }
-  let current = { zoom: ZOOM, lat: CENTER[1], lon: CENTER[0] };
-  setInterval(() => {
-    const sources = { light: lightPos(), offline: frameHash(offlineFrame), online: frameHash(onlineFrame) };
-    const leader = Object.keys(sources).find((name) => sources[name] && !samePos(sources[name], current));
-    if (!leader) return;
-    current = sources[leader];
-    if (leader !== "light") lightMap.jumpTo({ center: [current.lon, current.lat], zoom: current.zoom });
-    if (leader !== "offline" && offlineFrame.contentWindow) {
-      offlineFrame.contentWindow.location.hash = `map=${current.zoom}/${current.lat}/${current.lon}`;
-    }
-    if (leader !== "online" && onlineFrame.contentWindow) {
-      onlineFrame.contentWindow.location.hash = `map=${current.zoom}/${current.lat}/${current.lon}`;
-    }
-  }, 150);
-</script>
-</body>
-</html>

public/vendor/liberty-style/liberty.json

@@ -0,0 +1 @@
+{"version":8,"sources":{"ne2_shaded":{"maxzoom":6,"tileSize":256,"tiles":["https://tiles.openfreemap.org/natural_earth/ne2sr/{z}/{x}/{y}.png"],"type":"raster"},"openmaptiles":{"type":"vector","url":"https://tiles.openfreemap.org/planet"}},"sprite":"https://tiles.openfreemap.org/sprites/ofm_f384/ofm","glyphs":"https://tiles.openfreemap.org/fonts/{fontstack}/{range}.pbf","layers":[{"id":"background","type":"background","paint":{"background-color":"#f8f4f0"}},{"id":"natural_earth","type":"raster","source":"ne2_shaded","maxzoom":7,"paint":{"raster-opacity":["interpolate",["exponential",1.5],["zoom"],0,0.6,6,0.1]}},{"id":"park","type":"fill","source":"openmaptiles","source-layer":"park","paint":{"fill-color":"#d8e8c8","fill-opacity":0.7,"fill-outline-color":"rgba(95, 208, 100, 1)"}},{"id":"park_outline","type":"line","source":"openmaptiles","source-layer":"park","paint":{"line-color":"rgba(228, 241, 215, 1)","line-dasharray":[1,1.5]}},{"id":"landuse_residential","type":"fill","source":"openmaptiles","source-layer":"landuse","maxzoom":12,"filter":["==",["get","class"],"residential"],"paint":{"fill-color":["interpolate",["linear"],["zoom"],9,"hsla(0,3%,85%,0.84)",12,"hsla(35,57%,88%,0.49)"]}},{"id":"landcover_wood","type":"fill","source":"openmaptiles","source-layer":"landcover","filter":["==",["get","class"],"wood"],"paint":{"fill-antialias":false,"fill-color":"hsla(98,61%,72%,0.7)","fill-opacity":0.4}},{"id":"landcover_grass","type":"fill","source":"openmaptiles","source-layer":"landcover","filter":["==",["get","class"],"grass"],"paint":{"fill-antialias":false,"fill-color":"rgba(176, 213, 154, 1)","fill-opacity":0.3}},{"id":"landcover_ice","type":"fill","source":"openmaptiles","source-layer":"landcover","filter":["==",["get","class"],"ice"],"paint":{"fill-antialias":false,"fill-color":"rgba(224, 236, 236, 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