Defining spatial interaction
The roles of spatial interaction
The Uilman model
Distance decay and gravity models
the Break Point Model
The Huff Model
Expontents: Shaping the Curve
Definig Spatial Interaction
Involve the movement of goods, people, materials, and other tangible commodities, between the
different nodes of the city along transportation channels
Delivery trucks or trains taking raw materials or finished products to factories or stores
along roads or railways
Commuters going to and from work using roads or subways. Blue collar, white collar, pink
Oil or sewage flowing along pipeline
Migration of people ( and their thing and culture) from out your city or country to inside
your city or neighborhood
Refer to the transmission of more intangible commodities such as information between nodes in
the city along sometimes less visible transmission channels.
Flow of electricity, telecommunications, and the internet either along telephone wires or
through wireless transmission mediums
Flow of ideas that occurs within a classroom or opinions through the pages of a newspaper.
As you interact with other people, this may include diffusion of ideas or new technologies.
Flow of money or ‘thought’ goods though the internet All flows:
Require some type of infrastructure.
Occur at various scales, from the individual through the neighborhood to the city, region,
country and globe
Occur in various ways, ranging from tangible things moving along tangible channels to
intangible things moving along intangible channels. Ex, purchase online to get a ebook,
Collectively, all of this is known as spatial interaction and should be viewed as an integral
part of both your life and that of the city, essential to growth, functioning, and survival
because it is a necessary link in the process of decision making .
reciprocal-exchange-live & fake
value, attitudes, belief, culture
interaction can be better or worse
The Roles of Spatial of Interaction
It permits integration of the various spatially separated parts of the city
It permits differentiation and specialization within the system (comparative advantage)
It acts to organize the system, since the magnitude and nature of the flows create and
define the hierarchical levels that exist in the system.
Organize system neskd hierarchies
It acts as an agent of change since it provides the means by which commodities (such as
new fashions) and ideas/opinions (suchs as “we need a new government”) to move freely to
all individuals within the system
The Ullman Model of Spatial Interaction
Complementarity (a supply and demand relationship) much exist for interaction to take
Need , supply.
…this will only work if there is no intervening opportunity between the points of supp