1. Models of Migration
And Activity Space

2. Atlanta Braves Spring Training – Disney World
Gravity Model
Expectation of opportunity exerts ‘gravitational force’
“Opportunity” in big places
Shopping
Education
Employment
Entertainment and culture (museums, theatres, events)
Cultural expression
Eiffel Tower
Atlanta Braves Spring Training – Disney World

3. Gravity Model Based on Newton
Big things attract each other more than do small objects, and things close to each other have a stronger mutual attraction than do objects at greater distance.
Attraction decreases
very rapidly with even
small increases in separation

4. Gravity Model
Although spatial interaction always tends to decrease with greater distances between places, at a given distance it tends to expand with the increase in the places’ sizes. The bigger the place, the more likely you are to go there… except when it’s wicked far away.
Gravity model can be used to account for many flow patterns in human geography like population migration, journeys to work
or to shopping, commodity flows, etc.

5. Lee’s Model Lee believed… Migration is a decision
People assess and perceive the destination
People assess the conditions where they are
People look at obstacles between the point of origin and the destination
People consider personal circumstances
The decision to migrate = weighing the positives and negatives at the origin point with the positives and negatives at the destination point AND assessing intervening obstacles

6. Lee’s Model of Migration

7. The following slide shows sample activity spaces for a family of five.

8. Parent Two Middle Child Oldest Child Youngest Child Parent One
Home
Parent One

9. Time and Space Daily activities consume time and space
Can be represented on a space/time graph
“Space-time path”
“Space-time prism”
Length of prism indicates activity duration
Width indicates distance & mobility
Distance away
from home