MEMapContentType Constants Reference
Enumeration of different map content types.
The map is comprised of different imagery at different zoom levels. This would apply to almost all internet-based street maps where the level of detail of the data increases as you zoom in. This would not apply to most aerial or satellite image. When using content of this type, you will might want to set tileLevelBiasing to 1.0 which will force tiles to always be of the same level (at a memory cost).
The map is created by sampling a large fixed raster data set (satellite images, scanned FAA sectionals, aerial photographs, etc.).