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Add MLT (MapLibre Tile) output format

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Integrate the C++ MLT encoder from maplibre-tile-spec as a submodule.
Tiles are encoded by converting the existing mvt_tile to
mlt::Encoder::Layer and calling the encoder library directly.

New CLI flags:
  --output-format=mlt     Encode tiles as MLT instead of MVT
  --pretessellate         Pre-triangulate polygons (MLT only)
  --no-mlt-feature-sort   Disable within-tile Hilbert sorting (MLT only)

MLT tiles use .mlt extension in directory output and format=mlt in
mbtiles metadata. Compression and all existing flags work unchanged.
This commit is contained in:
Danila Poyarkov
2026-07-02 17:29:24 +03:00
parent 7fc82a1796
commit 53b98d76c4
15 changed files with 309 additions and 16 deletions
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README.md
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@@ -552,7 +552,10 @@ the same layer, enclose them in an `all` expression so they will all be evaluate
* `--limit-tile-feature-count-at-maximum-zoom=`_features_: Abruptly limit each tile at the maximum zoom level to the specified number of _features_, after ordering them if specified.
* `-pf` or `--no-feature-limit`: Don't limit tiles to 200,000 features
* `-pk` or `--no-tile-size-limit`: Don't limit tiles to 500K bytes
* `-pC` or `--no-tile-compression`: Don't compress the PBF vector tile data. If you are getting "Unimplemented type 3" error messages from a renderer, it is probably because it expects uncompressed tiles using this option rather than the normal gzip-compressed tiles.
* `-pC` or `--no-tile-compression`: Don't compress the vector tile data. If you are getting "Unimplemented type 3" error messages from a renderer, it is probably because it expects uncompressed tiles using this option rather than the normal gzip-compressed tiles.
* `--output-format=`*format*: Set the tile encoding format. Supported values: `mvt` (default, Mapbox Vector Tiles) or `mlt` ([MapLibre Tiles](https://github.com/maplibre/maplibre-tile-spec)). MLT is a columnar format that typically produces smaller tiles than MVT.
* `--pretessellate`: When using `--output-format=mlt`, pre-triangulate polygon geometries for faster rendering. Only applies to layers where all features are polygons.
* `--no-mlt-feature-sort`: When using `--output-format=mlt`, disable within-tile spatial sorting of features by Hilbert curve index. Sorting is on by default and improves compression.
* `-pg` or `--no-tile-stats`: Don't generate the `tilestats` row in the tileset metadata. Uploads without [tilestats](https://github.com/mapbox/mapbox-geostats) will take longer to process.
* `--tile-stats-attributes-limit=`*count*: Include `tilestats` information about at most *count* attributes instead of the default 1000.
* `--tile-stats-sample-values-limit=`*count*: Calculate `tilestats` attribute statistics based on *count* values instead of the default 1000.
@@ -821,7 +824,7 @@ The options are:
### Setting or disabling tile size limits
* `-pk` or `--no-tile-size-limit`: Don't skip tiles larger than 500K.
* `-pC` or `--no-tile-compression`: Don't compress the PBF vector tile data.
* `-pC` or `--no-tile-compression`: Don't compress the vector tile data.
* `-pg` or `--no-tile-stats`: Don't generate the `tilestats` row in the tileset metadata. Uploads without [tilestats](https://github.com/mapbox/mapbox-geostats) will take longer to process.
* `--tile-stats-attributes-limit=`*count*: Include `tilestats` information about at most *count* attributes instead of the default 1000.
* `--tile-stats-sample-values-limit=`*count*: Calculate `tilestats` attribute statistics based on *count* values instead of the default 1000.