Function applyHillshadeBasemap

applyHillshadeBasemap(
    map: NativeMap,
    definition: BasemapDefinition,
    layerId?: string,
): string
Applies a hillshade basemap to the map.
- Reuses terrain-dem source if it already covers the same DEM URL.
- Otherwise adds a new raster-dem source using HILLSHADE_SOURCE_ID.
- Inserts the hillshade layer below all existing layers.
Parameters
- map: NativeMap
  Native maplibregl.Map instance.
- definition: BasemapDefinition
  Basemap config with hillshade settings.
- layerId: string = BASEMAP_LAYER_ID
  Layer ID. Defaults to "__geoleaf_basemap_layer__".
Returns string
The source ID actually used ("terrain-dem" or "__geoleaf_basemap__").
- Defined in src/kernel/basemaps/hillshade.ts:126