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Spatially dependent diffusion
In the 
spatially dependent diffusion process, it is assumed that the spread is spatially
continuous from one or several sources.
Contagious expansion diffusion:
where the spreading phenomenon has a source and diffuses outwards into new
contiguous areas, like wildfire or diffusion of innovation or an infectious
disease.
Principle of contagious expansion diffusion at successive moments of time Relocation diffusion: where the
spread occurs when the spreading phenomena moves into new areas like
migration. It could be interpreted as a movement or a travel in space. This
specific spatial process will be considered in more details in the next section.
Principle of contagious relocation diffusion at successive moments of time. The feature is moving throughout
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