Isotropic plain uniform flat area population evenly

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Isotropic plain: uniform, flat area, population evenly distributed, culturally uniformed 2. Contacts identical: no difference in types of contact between people, identical influence on each person, assumed everyone adopts after one contact 3. Distance decay: probability of contact will decrease in distance Adding complexity to the model 1. Variable contacts required 2. Not isotropic Population unevenly distributed Add barriers Model network structure (hierarchical diffusion) Mean information field captures the distance decay effect 30 mc, 5 short answers (couple words to sentence long) Population Geography 1 (10/23) Population geography focuses on the number, composition, and distribution of human beings in relation to variations in space and place.
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World Population= 7 billion people -Even though the population is growing, the rate of growth is declining -China most population with billion, India 2 nd with billion, U.S. 3 rd in the 300 millions 4 Major World Concentrations Major Concentrations in: East Asia (Eastern China, Japan, Korea) South Asia (India, Pakistan, Bangladesh, Indonesia) o Half of world population in East Asia, South Asia Europe NE U.S./ SE Canada World Population Highly Uneven Distribution! 1. Land vs. Ocean a. 29% of Earth’s surface is terrestrial b. 90% of the world’s population lives on 20% of land area (6% of Earth’s surface) c. Ecumene: the areas of the world permanently inhabited (living there continuously) by people (approximately 60% of the land area is inhabited) i. So what percent of Earth is the ecumene?= 17% d. 40% of world’s population lives within 60 mile of the ocean e. Hypsometric (land elevations)/ Bathymetric curve (below sea level) 2. Elevation a. Highest density at low elevation (Mexico City is outlier; huge population at high elevation) b. Regions vulnerable to Sea Level Rise 3. North vs. South a. Higher percentage of population in northern hemisphere 4. Urban vs. Rural a. About 50/50 split worldwide b. U.S. is very urban while Africa is less
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Calculating World Population Calculated by census-taking (estimates by counting every person) and statistical modeling (showing analysis on graph) More growth of population in less developed countries Measures of Population Composition Crude Birth Rate (CBR ) is the annual number of live births per 1000 population (crude because not taking in sex and age composition) Total Fertility Rate (TFR) is the average number of children that would be born to each woman during her childbearing years (15- 49yrs) if she bore children at the current year’s rate for women of that age (not set number, dependent on current year) (rate of more than 2 to keep worldwide population stable) o Replacement level fertility describes what level of fertility is required to ensure that enough women survive to reproduce (rate of more 2.1 to 2.3 to keep worldwide population stable to take into contact infant mortality) Higher levels of mortality in a population mean a higher replacement level fertility (more infants dying means need more babies being born) o What affects fertility rates?
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