CesiumJS Imagery Layers

CesiumJS v1.142 -- Imagery providers supply raster tile data rendered on the Globe or draped over a Cesium3DTileset. The three core abstractions are ImageryProvider (fetches tiles), ImageryLayer (display settings), and ImageryLayerCollection (ordered stack on the globe).

ImageryProvider        (abstract -- fetches tile images)
  -> ImageryLayer      (wraps one provider; alpha, brightness, split, etc.)
    -> ImageryLayerCollection  (ordered stack; index 0 = base layer)
      -> Globe / Cesium3DTileset

Layers render bottom-to-top. Index 0 is the base layer, stretched to fill the globe even if its rectangle does not cover the entire world.

Quick Start and ImageryLayer Factories