# Changelog — Map

All notable changes to the Map standard and its reference implementation.
Format follows Keep a Changelog; the standard versions independently of the
reference crates (which share the `map-rs` workspace version).

## [Unreleased]

### Changed

- **SPEC §6 / `spec/receipt.md` §2 — a vendor counter is a hardware reading
  only while it is demonstrably live.** A RAPL, NVML or Apple IOReport reading
  MAY be graded `HwShunt` only while the counter has been observed advancing
  under load for the domain the figure claims (for IOReport: the CPU energy rail
  itself, in at least 5 sample intervals, at least 4 of every 5, over at least
  300 ms of CPU burn, counting only intervals, each from one sample in hand to
  the next, no longer than three of the probe's 25 ms ticks: a longer one counts
  as nothing, neither among the intervals, nor as an advance, nor towards the
  300 ms, which is the summed length of the intervals that count); a present
  counter that is not live — frozen, or republished in lumps — falls back to the
  estimator. No wire or conformance-vector change.

## [0.1.0] — 2026-06-04

Initial draft standard — the protocol spine.

### Added

- **Specification.** `SPEC.md` (RFC 2119) defining the tile cargo, the 4D cell
  key, canonical serialization + content addressing, the range-requestable
  tileset + signed manifest/revision chain, the F0–F4 fidelity cascade, and the
  JCR-1 receipt. Sub-specs under `spec/`.
- **`map-schema`** — `CellKey` (S2 + altitude band + time bucket + LOD),
  `ContentId`, `Tile`, `Directory` (Hilbert-sorted + range planner), `Manifest`,
  `Revision`, `verify_chain`, and the `Tier` enum.
- **`map-cascade`** — `resolve` over a `TileSource`, returning the highest tier
  ≤ the request with a guaranteed F1 fallback.
- **`map-receipt`** — `Receipt`, `Energy`, `Provenance`, JCR-1 sealing/verifying
  (vendored, byte-compatible with the family verifiers).
- **`map-conformance`** — C1–C5 + C-neg harness (all checks real) and the
  `gen-vectors` generator; published vectors in `conformance/v1/`.
- **Vocabulary.** `vocab/v1.ttl`, `v1.jsonld`, `v1.shapes.ttl`, `LEXICON.md`.

- **`map-index`** — pure-Rust S2 cell geometry (cell ids, projection, lat/lng,
  points, edges, polygons, regions/caps/rects, the region coverer, metrics)
  ported from `joule-s2`, plus a `bridge` to `map-schema`: `cell_key` from
  coordinates, and `cover_region`/`cover_viewport` from a cap, rectangle, or
  **polygon** to sorted `CellKey`s feeding the directory range planner. 75 tests,
  zero clippy warnings.
- **Fixed (vs. upstream `joule-s2`)** the `polygon` module, which failed its own
  tests upstream: spherical point-in-polygon now uses an orientation-robust
  winding-angle test (was a degenerate ray); area uses the van Oosterom–Strackee
  signed-area fan (was Girard's-formula complement, ≈4π−A); and `S2Polygon` now
  implements `S2Region`, so the coverer accepts arbitrary boundaries / footprints
  / geofences.
- **`map-index::volume`** — the recommended 4D discretization scheme ported from
  `joule-spatial3d`: logarithmic `AltBand`s (Mariana Trench → cislunar),
  logarithmic `TimeTier`/`TimeBucket`s (1 s → 100 yr), `SpaceTimePoint`,
  `SpatialKey`, and the `Spatial3DIndex`/`PositionRingBuffer` runtime utilities.
  New bridge functions `alt_band`, `time_bucket`, and `cover_volume` map the
  scheme into `map-schema` `CellKey`s and cover a horizontal region × altitude
  range × time range. (The `chrono` convenience constructors were dropped to keep
  the reference dependency-light.)
- **`map-tiles`** — tile payload codecs ported from `joule-tiles`: MVT vector,
  raster (PNG/WebP), terrain quantized-mesh, and 3D Tiles, with no S2/geo or
  routing dependency. A `tile` bridge wraps each as a content-addressed
  `map-schema` `Tile` at its cascade tier — terrain → `F1`, raster → `F2`, MVT +
  b3dm → `F3`, splat → `F4` — with stable `codec` tags.
- **`map-tiles` splat codec** (`map_tiles::splat`) — the `F4:Photoreal` cargo
  codec the tier was missing: a compact SPZ-style container for 3D Gaussian splats
  (positions fixed-point, scales log-quantized, rotation quaternion + colour as
  bytes, gzip-compressed), with `encode_splats`/`decode_splats`. **Spherical
  harmonics**: encodes degree-`n` view-dependent colour as `(n+1)²−1` quantized
  RGB coefficients above the DC term (`sh_degree` in the header). Round-trip
  (incl. degree-1 SH) + compression tests.
- **`map-tiles` PLY ingest** (`map_tiles::splat::read_ply`) — reads the de-facto
  **INRIA `.ply`** 3DGS interchange format (ASCII + binary-little-endian),
  inverting the trainer's storage conventions (log-scales → `exp`, logit-opacity
  → `sigmoid`, `(w,x,y,z)` → `(x,y,z,w)` normalized, DC `= 0.5 + C₀·f_dc`,
  channel-major `f_rest` → per-coefficient SH) into `Splat`s that `encode_splats`
  re-encodes into a conforming F4 tile. ASCII + binary + rejection tests.
- **`map-tiles` b3dm / glTF decode** (`map_tiles::tiles3d::read_b3dm`, `read_glb`)
  — the reader half of the 3D Tiles codec: strips the b3dm header + feature/batch
  tables and decodes the embedded binary glTF (GLB) into a triangle mesh, general
  over accessors/bufferViews (f32 VEC3 positions; u8/u16/u32 indices; accessor +
  bufferView byte offsets and strides; multi-primitive merge). Round-trips
  `B3dmBuilder::encode`; encode/decode + u16-index + rejection tests.
- **`map-serve` crate** — a transport-agnostic tile-serving core (no HTTP-framework
  dependency): `serve(store, steward, req)` parses a tile request, resolves it
  through the F0–F4 cascade, and returns a content-addressed `Response` with a
  strong `ETag`, `Cache-Control: immutable`, `If-None-Match` → `304`, `X-Map-Tier`
  / fell-back, and a JCR-1 energy-receipt header. Includes a `MemoryStore`
  reference `TileServer`, plus a filesystem `DirStore` (content-addressed blobs on
  disk + a reloadable JSON index; `std`-only). Pure + unit-tested with a runnable
  doctest.
- **`map-serve-axum` crate** — an axum/tokio HTTP binding for the serving core:
  `router(store, steward)` exposes `serve` as an axum `Router`, `run(addr, …)` is a
  one-call server. The async stack is isolated here so `map-serve` stays
  framework-free. Verified by `oneshot` tests and a live-socket demo over real HTTP.
- **`map-route` turn-by-turn + isochrones** — `directions::turn_by_turn` derives
  human maneuvers (depart with cardinal heading, slight/normal/sharp turns,
  U-turn, arrive) from route-segment bearing deltas, merging straight runs into
  one step; `isochrone::isochrone` computes the budget-bounded reachable set from
  a source by travel time or distance (Dijkstra expansion with pruning). Both
  unit-tested.
- **`map-route` multi-modal + traffic-aware costs** — a `CostModel` trait and a
  built-in `ModeProfile` (car/bicycle/foot) with per-mode road-class access
  matrices, free-flow speeds, and a congestion multiplier; `cost::find_route_with`
  is a generalized A* (admissible time heuristic) that skips inaccessible edges
  and reports mode-specific durations. `RoadType` is now `Copy`. Unit-tested
  (mode access, highway avoidance on foot, traffic slowdown).
- **`map-route` public-transit routing** (`transit`) — the Connection Scan
  Algorithm over a GTFS-like `Timetable`: earliest arrival from timetabled
  `Connection`s with walking-footpath transfers (manual or auto-generated within a
  radius), reconstructing ride/walk `Leg`s. Times are integer seconds. Unit-tested
  (line with wait, missed connection, faster-of-two, footpath transfer, auto-transfers).
- **`map-tiles` MVT decoder** — added the reader half (`mvt::decode_tile`,
  `decode_geometry`, `unzigzag`): a minimal protobuf reader inverse to the
  encoder, plus the geometry-command decoder back to absolute tile-local rings /
  line-strings. A conforming reader must decode to render; the encoder shipped
  without it. Encode→decode roundtrip tests cover geometry + properties + closed
  polygons. (Not in upstream `joule-tiles`.)
  - **Real-world robustness fix:** `decode_value` now handles MVT `sint_value`
    (field 6, zigzag), decodes `int_value` (field 4) as a plain varint per spec
    (was wrongly zigzag), and tolerates an empty/unknown value instead of aborting
    the whole tile. Verified by decoding live OpenMapTiles tiles (OpenFreeMap) —
    previously failed with `ProtobufError("empty value")`.
- **Fixed (vs. upstream `joule-tiles`)** `mvt::encode_polygon`, which clobbered
  the `CMD_MOVE_TO` command word with a coordinate and reset the geometry cursor
  per ring (malformed multi-ring polygons); added the missing regression test.
  Backported to `joule-tiles`.
- **`map-orbital`** — TLE parsing, SGP4/SDP4 propagation, and ECI/ECEF/geodetic
  transforms ported from `joule-orbital` (no `tracing` dependency; only the
  doctest referenced it). A `bridge` maps a propagated satellite sub-point to a
  `map-schema` `CellKey` — S2 cell at the sub-point, the altitude band for its
  altitude (the ISS lands in the LEO band), and the time bucket for the instant —
  so a live satellite is an `F3` address on the same 4D grid as every tile. Lint
  cleanups only; the 38 SGP4/SDP4 known-answer tests confirm the numerics are
  unchanged.
- **`map-route`** — local geospatial capabilities over a tileset, ported from
  `joule-maps` (energy metering, tile cache, and the in-memory store dropped —
  redundant with `map-receipt`/`map-tiles`/`map-schema`): WGS84 geometry,
  haversine/bearing/midpoint, point-in-polygon, POI geocoding, Dijkstra + A*
  routing on a weighted graph, and polygon geofencing. Added a **feed-agnostic
  adapter** (`feed::{Entity, Feed}`): any source — flights, vessels, satellites,
  CVEs, incidents, supply-chain nodes, enterprise signals — resolves to a
  `CellKey`, so "swap the feeds and it visualizes anything with a location or a
  time" is a property of the standard, not a per-feed rewrite. Tests cover the
  ported geocode/route/geofence/geometry paths (the upstream tests did not come
  with the extracted subset).
- **`map-schema`** — `TimeBucket.width_ms` widened `u32 → u64` so the temporal
  axis can express coarse archival buckets (a year, a century); `u32` capped it
  at ~49 days. CBOR encodes integers by magnitude, so existing content ids and
  conformance vectors are byte-identical.

### Notes

- The remaining substrate crates (`map-index` 4D layer from `joule-spatial3d`,
  `map-tiles`, `map-orbital`, `map-route`) and the demonstrator's `wgpu` renderer
  are not yet in this release — see [`ROADMAP.md`](ROADMAP.md).