Function bake_land_cache 

pub fn bake_land_cache(
    chart: &ChartStore,
    out: Option<&Path>,
) -> Result<PathBuf, LandCacheError>

Bakes a land cache for chart, covering whatever area detect_coverage_area finds plus RASTER_PADDING_DEG, and writes it to <chart.path()>.hazcache (or out, if given) – run once, ahead of time, by enc-check bake, never at route-query time.

The region is detected from the chart itself, not named by a caller: see detect_coverage_area’s own doc for why a caller-supplied area would either have to be kept in sync by hand with whatever a deployment’s own chart-ingest pipeline adds to the file over time, or risk baking a region that quietly stops matching what the chart actually covers.

Errors

If the chart cannot be read, carries no coverage to detect a region from, its own file metadata cannot be read, or the cache file cannot be written.