Geography: Its Nature and Perspectives Flashcards
absolute distance
an exact measure of the separation between two points using a standard measure such as inches, meters or miles
absolute location
the precise location of any object or place on the earth’s surface as determined by a standard grid or coordinate system
latitude and longitude are most commonly used to determine absolute location
accessibility
ease with which you, goods, and/or ideas can reach a destination
determined by a place’s connectivity; the more means there are for interacting with a place, the higher its accessibility
administrative regions
politically determined; boundaries are exact
are hierarchical or nested. eg: in the USA, states exist within the country, counties exist within states, and census tracts exist within counties.
aggregation
the size of the unit under investigation such as cities, counties, states, or countries
like simplification, completely depends on the purpose of the map
level also depends on the data geographers have access to
if a geographer investigates population density with data at the state level, his map will dramatically differ from a geographer that has density data at the country level
azimuthal projections
planar projections: formed when a flat piece of paper is placed on top of the globe and a light source projects the surrounding areas onto the map
typically, the north pole or the south pole is oriented at the center of the map, giving an impression of looking up or down at the earth
barriers to diffusion
something that inhibits a phenomenon from spreading across space
physical barriers: objects that prohibit interaction from taking place (eg: mountain ranges, rivers, highways - where interactions occur on food)
sociocultural factors: when a person’s beliefs, culture, or place in society prohibit interaction with certain people or places
psychological barriers: things like fear or ignorance that keep individuals from interaction with certain people or places
cartograms
transform space so that the political unit, such as a state or country, with the greatest value for some type of data is represented by the largest relative area, and all other polygons are represented proportionately to that largest polygon
can be powerful for illustrating comparative patterns. eg: a cartogram of electoral votes in the US would make some states really small and some really large - this shows a more accurate picture of each state’s influence on the political process
cartography
the art and science of making maps
the goal of cartographers is to develop maps that accurately and elegantly convey spatial information
cartographic scale
also called map scale; refers to the ratio between distance on a map and the actual distance on the earth’s surface (eg: 1:200)
ratio remains constant despite units (inches, feet, miles, etc)
on small scale maps, ratio between map units and ground units is small and maps represent a larger piece of the earth’s surface
on large scale maps, ratio between map units and ground units is large, meaning map represents a relatively small piece of the earth’s surface
choropleth maps
use colours or tonal shadings to represent categories of data for given geographic ares; countries, states, or counties most commonly use polygons
a map population density by county in the US might use 5 shades of green to classify density values
cognitive maps
a dynamic internal representation of a place or environment
the sketch map is the external representation of the spatial information that exists in a person’s head
each cognitive map is highly individual, dependent on information an individual deems important, and is limited by amount and type of experience an individual has with a place
cognitive/perceptual/vernacular regions
they describe how people informally organize places in their mind
even though formed by individuals, usually are shared between people because of culturally shared beliefs. eg: most people would draw similar boundaries around the “Deep South”
boundaries are imprecise, vague, or variable
concentration
when spatial distributions of objects or features appear in close proximity to one another, they are said to be concentrated. this is also called a cluster
conformal projection
the shapes of small areas are preserved
in many conformal projections like the Mercator Projection, compass direction is preserved making them useful for navigation purposes
connectivity
a measure of all the means of connection and communication between places
virtually synonymous with relative distance as some places are highly connected to one another yet separated by significant distance
contagious expansion diffusion
describes diffusion resulting from direct contact with an individual
all infectious diseases such as AIDS are spread by contagious diffusion
density
the amount of a particular feature within a given area. it is not the same thing as dense, which implies a cluster
eg: population density is the number of people within a given area
diffusion
the way in which phenomena such as technological innovations, cultural trends, or outbreaks of diseases travel over space.
two main processes spread phenomena across space: expansion diffusion and relocation diffusion
relocation diffusion
physical movement leads to spread, usually as a result of migration; number of adopters is relatively small
expansion diffusion
interaction leads to spread and numbers of adapters grow rapidly before stabilizing
distance decay
describes the pattern of diminishing likelihood of interaction with a place with increasing distance from that place
eg: the majority of people who shop at a particular grocery store live or work close by. few customers in that strore live far from its location.
different activities have different distance decay curves; that is, people travel short distances for everyday goods like milk and bread, but travel farther to attend special events
distance small = interaction strong; distance large = interaction slight
distortion
all flat maps are distorted as a result of projecting a three-dimensional surface onto a two-dimensional surface. the only accurate representation of the earth’s surface is a globe
some other projections distort certain features in favour of preserving others
generally, the major features that get distorted or preserved are shape, area, and direction
distribution concepts
concepts that are used to understand how certain objects, features, and phenomena are organized in space
concentration, density, dispersion, and pattern area are all distribution concepts
dot density maps
use points to represent particular values. eg: cropland harvested where each dot represents 1,000 bushels of corn
value comes from the ability to facilitate perception of spatial pattern; in example of corn cropland harvested, an obvious spatial pattern would emerge in the Midwest
the disadvantage is that data that does not meet the threshold (eg: only 999 bushels of corn harvested in a particular are) does not appear on the map
earth’s graticule
SEE CARD #25
environmental geography
results from the intersection of human and physical geography
environmental geographers, or geographers who study human environment relationships (HER), come from almost every academic discipline and frequently occupy prominent positions at the forefront of debates regarding anthropogenic, or human-induced, environmental change, conservation planning, and sustainability
concerned with anything from the history of a given landscape and the effects of pollution on impoverished neighbourhoods, to the creation of nature reserves for endangered species
equal-area projection
cartographers using or making these types of projections are interested in the preservation of an area; in other words, shapes or directions are distorted but sizes of landmasses are correct in relation to each other
distance decay curve
SEE CARD #21