Rust reference

tylertoo-core is the engine behind tylertoo. The CLI (tylertoo) and the Python package are thin wrappers over it, so embedding the crate gives you the same overview-construction and PMTiles-export pipeline with no subprocess or serialization boundary.

API documentation

The canonical, always-current API reference is the crate's rustdoc — generated from the doc-comments in the source, so it never drifts. Rather than re-render rustdoc into this site, this page links to it.

• Published docs: docs.rs/tylertoo-core — live once the crate is published to crates.io. Until the first release, use the local build below.
• Local docs (works today):

cargo doc -p tylertoo-core --no-deps --open

Key entry points

The production path is a two-step chain — build an overview GeoParquet file, then export it to a PMTiles archive — mirroring the CLI and Python surfaces.

Symbol	Path	Purpose
convert_to_overviews	overview::convert	Build a multi-resolution overview file from one input.
convert_to_overviews_sources	overview::convert	Same, over an ordered set of inputs (multi-partition / --files-from).
ConvertOptions	overview::convert	Every overview knob (ranking, thinning, density budget, simplification, coalescing).
ConvertReport	overview::convert	Per-level feature/vertex/byte counts and remote-fetch stats.
export_pmtiles	overview::export	Export an overview file to a PMTiles archive.
ExportOptions	overview::export	Layer name, tile buffer/extent, per-tile size cap, wave scheduling.
ExportReport	overview::export	Per-zoom tile counts and oversized-tile tallies.
StreamingPmtilesWriter	crate root	Lower-level streaming PMTiles v3 writer, if you drive tiling yourself.
validate_wgs84, extract_crs, CrsInfo	quality	CRS checks used by the input contract.

For the shape of ConvertOptions / ExportOptions and their defaults, see the rustdoc above; each field carries a doc-comment. The tuning semantics behind the knobs are covered in Tuning at each zoom.