| Fundamental Concepts: The Spatial Perspective
I. The Spatial Perspective
A. Maps: the cartographic tradition has always
been unique to geography.
B. Scale
1. Global/Regional/Local
2. Interaction across
scales
C. Location
1. Absolute Location:
latitude and longitude coordinates
2. Relative Location:
location in relation to other places
3. Site vs. Situation
a.
Site: actual place and its physical characteristics
b.
Situation: external reference or context of the place
D. Distance
1. Absolute Distance:
measured in a standard metric
2. Relative Distance:
measured in time or economics
E. Direction
1. Absolute Direction:
North, South, East, West
2. Relative Direction:
more colloquial, i.e. "the deep south," or "the far east"
II. Maps in Human Geography
A. Geographic Information Systems and GIScience
1. "GIS's are simultaneously the
telescope, the microscope, the computer, and the Xerox machine of
regional analysis and synthesis of spatial data." Ron Abler.
2. GIScience involves research
emerging from "...the generic issues that surround the use of GIS
technology, impded its sucessful implementation, or emerge
from an understanding of its potential capabilities." Michael
Goodchild.
B. Maps and place attributes
1. Cultural and Physical
attributes
2. Structured place attributes/spatial
distribution
a.
density: points/unit area
b.
linear, clustered, or dispersed arrangements
3. Interaction among
places
a.
accessibility: characterisitc of a spot (i.e. the Netherlands rail system)
b.
connectivity: the characteristics that fuse and hold places together
c. First law of
Geography: "everything is related to everything else, but relationships
are stronger when ther are near to one another." Waldo Tobler
C. Maps and Environmental Issues
1. Environmental pollution
(risk studies)
2. Human-Environment
interaction (maps of deforestation in the Amazon)
3. Remote Sensing
4. Global Positioning
System (GPS)
D. Maps and Human Mobility
--Volume (i.e. migration systems) use
arrows and line thickness to indicate volume and direction or outmigration
probabilities plotted on a contour map
E. Depicting Regions on Maps
1. Criteria and attributes
2. Formal Regions
3. Perceptual Regions
4. Functional Regions
5. Hierarchical Regions
F. Maps in the Mind
1. Helpful for understanding
human behavior
2. Culturally influenced
and subjective
3. Mental maps (James
and Colleen's maps)
4. Environmental Perception
III. Insights of Geography
A. Places have location, direction, and distance
with respect to other places
B. Scale is important--places may be large or
small
C. A place has both physical structure and cultural
content
D. The characteristics of places develop and
change over time
E. Places interact with other places
F. The content of places is rationally structured
G. Places may be generalized into regions of
similarities and differences
IV. Map Projections
A. Perpetual problem of projecting a spherical
surface onto a planar surface
--scale: map units/units in
the real world
B. Properties of the globe grid:
1. All meridians are
of equal length; eah is one half the length of the equator
2. All meridians converge
at the poles and are true north-south lines
3. All lines of latitude
(parallels) are parallel to each other and the equator
4. Parallels decrease
in length as one nears the poles
5. Meridians and parallels
intersect at right angles
6. The scale on the surface
of the globe is the same in every direction
C. Geometrical Projections
1. Graticule is transferred
to geometric shape (plane, cone, and cylinder) and shape is cut and flattened
2. Orthographic projections:
light source is at infinity
3. Gnomonic projections:
light source is at the center of the sphere
4. Stereographic projections:
light source is at antipode
D. Mathematical Projections
1. Emphasize and preserve
elements of a globe grid that perspective projections cannot.
2. Map Distortions:
a.
Equal area maps preserve proportional size but distort shape
b.
Conformal maps preserve true shape and directionality for small areas
c. Equi-distant
maps correctly represent true great arc distances between 2 points
on maps but distance between other points is distorted
d.
Azimuthal maps preserve directionality when direction is radiating from
one central point
3. All maps will be distorted,
must decide what it is you want preserved and choose map accordingly.
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