A type of scalability where an enhancement layer also uses predictions from pel data derived from a lower layer without using motion vectors. The layers can have different frame sizes, frame rates or chroma formats. Spatial scalability offers a layering of the picture resolution, suitable for HDTV transmissions, for instance. By decoding of the lower layer, a “normal” picture is obtained, and by decoding of the enhancement layer, the HDTV picture may be constructed.