AP Human Geography Unit 1: Thinking Geographically Comprehensive Summary
Principles of Map Projections and Distortion
The Problem of Distortion: Every map is a distorted image of the globe. It is impossible to perfectly project a three-dimensional object, such as a globe, onto a two-dimensional surface.
Types of Distortion: Every map projection must distort one or more of the following: direction, shape, area, or distance.
Specific Map Projections: *
Mercator Map Projection: This is a conformal projection. It is excellent at showing accurate direction, which is why it was historically used for naval expeditions. However, it has significant distortion in the size and location of landmasses. For example, it gives the illusion that Greenland is larger than Africa, when in reality, Africa is more than larger than Greenland.
* Goode Homolosine Projection: This is an equal-area, pseudo-cylindrical projection. It effectively shows the true size and shape of landmasses but distorts distances near the edges of the map. It is an interrupted map, meaning parts of the globe are removed to reduce distortion; therefore, it is not helpful for direction.
* Robinson Projection: This projection has more distortion near the poles to help preserve the size and shape of landmasses. In an effort to minimize overall distortion, it spreads the distortion across the entire map for all areas.
* Gall-Peters Projection: This is one of the more accurate projections for showing the true size of the Earth’s landmasses. However, it features significant distortion in the shape of landmasses and direction.
Categories and Types of Maps
Reference Maps: These are informational maps that show boundaries, toponyms (place names), and geographic features. They are used for directions, displaying property lines, political boundaries, elevation changes, and public transportation routes.
* Topographic Maps: A specific type of reference map that uses contour lines to display terrain and elevation. Close lines indicate steep terrain, while more space between lines indicates less elevation change.
Thematic Maps: These display spatial patterns of places and use quantitative data to display specific topics.
* Chloropleth Maps: Display data using different colors or shades of color, where each shade represents a different quantity in the data set.
* Dot Density Maps: Use points to show where data is occurring. This displays spatial distribution but can become confusing if data is clustered together.
* Graduated Symbol Maps: Use shapes, items, or symbols of varying sizes to show location and the amount of data. They are highly visual but can suffer from overlapping information.
* Isoline Maps: Use lines to connect different areas that have similar or equal amounts of data. A common example is a weather map showing areas with the same temperature.
* Cartogram Maps: Display data dynamically by representing the value through the size of an area. For example, China and India appear much larger than Canada and Bahrain on a population cartogram.
* Flowline Maps: Specifically used to show the movement of goods, people, animals, services, or ideas between different locations.
Geographic Measurement and Spatial Analysis
Absolute vs. Relative Direction: * Absolute Direction: The exact direction, such as traveling South at on a compass. * Relative Direction: Depends on the surrounding area (e.g., stating that a yellow circle is North of a blue circle).
Absolute vs. Relative Distance: * Absolute Distance: Measured in exact units, such as or . * Relative Distance: An approximate measurement, often expressed in time (e.g., driving from Minneapolis to Orlando takes about ).
Spatial Distribution Concepts: * Clustered: Information or objects packed closely together with little space between them. * Dispersed: Objects spread out over a geographic area. * Concentration: How things are spread out (clustered vs. dispersed). * Density: The amount of objects or people in a specific area. Urban areas are more densely populated than rural areas. * Pattern: The arrangement of things, such as a grid formation or a linear pattern.
Geospatial Technologies and Data Collection
Geospatial Technologies: * Remote Sensing: Collecting information from satellites orbiting the Earth to understand changes over time. * Geographic Information Systems (GIS): A computer system that collects, analyzes, and displays geographic data using layered maps to show spatial associations. * Global Positioning System (GPS): Uses satellites to provide an absolute location for navigation or finding specific spots.
Methods of Field Data Collection: * Field Observations: Visiting a place in the real world to record first-hand observations (accurate but costly). * Personal Interviews: Collecting unique perspectives by asking questions to gain insight into an area. * Media Reports: Online articles, newspapers, or local news providing insight into community experiences. * Government Documents: Laws and official records that show cultural values, priorities, and governing systems. * Travel Narratives: Personal perspectives from individuals visiting or living in an area. * Landscape and Photo Analysis: Studying images captured by technology or photographs to observe human impact, vegetation, wildlife, and physical elements.
Data Categorization: Qualitative vs. Quantitative
Qualitative Data: Information in word form that is subjective and up for interpretation or debate. It is often collected via observations and interviews (e.g., approval ratings of school lunch).
Quantitative Data: Information in number form that is concrete and objective. It is not up for debate. * Census: An official population count that includes demographic data such as age, education level, housing status, and sex. For example, India's population pyramid provides a quantitative breakdown by age cohort.
Scale and Scale of Analysis
Definitions of Scale: * Scale: The distance on a map in relation to the distance on the Earth's surface. * Small Scale Maps: Zoomed out, showing more of the Earth but relying on generalizations (e.g., a global map). * Large Scale Maps: Zoomed in, showing smaller areas with more details (e.g., a city map).
Categories of Scale: Global, National, Regional, and Local (including sub-national/sub-state scales like counties or census tracts).
Scales of Analysis: How data is organized and presented. * Global Scale of Analysis: Shows global patterns without using country boundaries. * National Scale of Analysis: Data organized by individual countries. * Regional Scale of Analysis: Data organized by specific regions (e.g., Federal Reserve Districts). * Local Scale of Analysis: Data organized by local units (e.g., counties).
Data Usage by Scale: * Local Governments: Use data for zoning and planning (e.g., building schools for young populations or investing in healthcare for older populations). * National/Regional Governments: Allocate funds for infrastructure and create laws based on regional successes. * Global (Supranational) Organizations: The UN uses data to counter famine, epidemics, and conflicts. * Businesses: Use local census tracts for income data, regional data for store sales/tax rates, and global data for resource sources and new markets.
Spatial Concepts and Human-Environment Interaction
Location: * Absolute Location: Exact coordinates on the Earth’s surface using longitude and latitude. * Relative Location: The relation a place has to surrounding buildings or geographic features.
Sense of Place: An emotional response forming a perception of a place based on unique features or memories. * Placelessness: When a location lacks a unique identity.
Connectivity Concepts: * Time-Space Compression: The phenomenon where the world feels smaller due to advancements in technology, communication, and transportation. * Distance Decay: The likelihood of interaction decreases as the distance between people or places increases.
Theories of Human-Environment Interaction: * Environmental Determinism: The belief that the physical environment dictates the success and culture of a society. Criticized for promoting imperialism and ignoring human adaptation. * Environmental Possibilism: The idea that the environment sets limits, but humans have the ability to adjust the physical environment and create their own success.
Land Use and Resources
Types of Land Use: * Agricultural: Production of products for humans and animals. * Industrial: Factories and manufacturing facilities. * Commercial: Businesses and stores selling goods/services. * Residential: Living spaces and homes. * Recreational: Relaxation areas (stadiums, parks, campsites). * Transportational: Roads, railroads, airports, ports, and subways.
Natural Resources: * Renewable: Can be used multiple times (crops, trees). * Non-renewable: Gone once used (oil, natural gas).
Sustainability: Utilizing resources to meet current needs without compromising the ability of future generations to do the same.
Regional Analysis
Region: A geographic area defined by unique characteristics or patterns.
Types of Regions: * Formal (Uniform) Regions: Areas with common attributes (economic, political, social, environmental). Examples: Latin America (political), Rocky Mountains (physical). * Functional (Nodal) Regions: Organized around a node or center point (activity, communication, travel). Examples: radio station range, subway stations, power plants. * Perceptual (Vernacular) Regions: Based on opinions, attitudes, or beliefs. They lack a perfect definition and exist in people's minds. Example: The Middle East. Cardinal directions (e.g., "the South") usually indicate perceptual regions.
Nature of Regions: Regions can change, overlap, and become contested over time.