AV1 Spatial Layers Gop Patterns
The following charts illustrate the gop structures for AV1 spatial scalability, enabled by spatialLayers (and optional spatialLayersRefBaseLayer) parameters
2 spatial layers (spatialLayers=2)

3 spatial layers (spatialLayers=3)

4 spatial layers (spatialLayers=4)

3 spatial layers, with each EL referencing BL (spatialLayers=3, spatialLayersRefBaseLayer=1)

4 spatial layers, with each EL referencing BL (spatialLayers=4, spatialLayersRefBaseLayer=1)
