Well I know Simon's ideas on the matter, that's why I was asking for yours. I haven't given it enough thought to have strong opinions but here's a quick attempt:
Similar: Models and maps both consists of abstractions. The abstractions are chosen, for a purpose, in a context.
Different: Models are conceptual. Models are not just tools for understanding, they are understanding. I can draw or code or somehow express a model, but it's only a representation of an underlying model, not the model itself.
Landscapes and maps are physical. The symbols on the map are linked to things in the landscape. You don't visualize a map, the visualisation is the map.