05eaef966d
The open geospatial stack converged on PMTiles — a single-file, range-requestable archive served straight from object storage and read by MapLibre / pmtiles CLIs / Overture tooling. map's "a tileset is a file, not a service" is the same idea; emit the incumbent's format so map output is consumable without a map-specific reader. New map-pmtiles crate: a self-contained, round-trip-validated PMTiles v3 writer — Hilbert tile-id ordering (z=1 anchors + cross-zoom inverse verified), the varint clustered directory (delta tile-ids, run-length, consecutive-offset sentinel), and the 127-byte header. Directories and metadata written uncompressed (internal compression = none), so no gzip dep and deterministic bytes. read_tile() reads its own output back byte-identical for validation. from_map_tiles filters a tileset to its SURFACE tiles (alt 0, atemporal, base LOD) — PMTiles' 2-D z/x/y grid can't carry map's altitude/time/LOD axes (that 4-D coverage is GeoParquet's job). The S2 -> z/x/y projection is a caller-supplied seam (it lives in map's substrate), keeping this crate a pure serializer. Note: root-only directory (large tilesets need leaf dirs); interop with the reference pmtiles libs is the next validation. 4 tests green, clippy clean. Deps: map-schema + serde_json only. Co-Authored-By: Claude Opus 4.8 <[email protected]>
12 lines
584 B
TOML
12 lines
584 B
TOML
[package]
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name = "map-pmtiles"
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version.workspace = true
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edition.workspace = true
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rust-version.workspace = true
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license.workspace = true
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repository.workspace = true
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description = "PMTiles v3 export for the map open standard — write map surface tiles into the single-file PMTiles archive (Hilbert tile ids, varint clustered directory, 127-byte header; compression=none, no extra deps) so the ecosystem (PMTiles readers, MapLibre, Overture tooling) can consume map output. Ingest, not compete."
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[dependencies]
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map-schema = { path = "../map-schema" }
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serde_json = { workspace = true }
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