AP Human Geography Unit 1 Notes: Geographic Concepts, Tools, and Data

Map

A visual representation of Earth (or part of Earth) drawn on a flat surface, used to analyze spatial questions (where, why there, connections).

Spatial data

Information with a location component (e.g., coordinates or values tied to areas) that can be analyzed for patterns across space.

Spatial thinking

Reasoning that explains how location affects people and processes by analyzing location, distribution, patterns, scale, and connections.

Absolute location

A precise position on Earth, usually given by latitude and longitude coordinates.

Relative location

Where a place is in relation to other places (e.g., near a river or 50 miles from a port), often used to explain development and interactions.

Latitude

Lines measuring distance north or south of the Equator.

Longitude

Lines measuring distance east or west of the Prime Meridian.

Scale (map scale)

The relationship between distance on a map and the corresponding distance on Earth; affects what patterns are visible and how data is interpreted.

Large-scale map

A “zoomed-in” map showing a small area with high detail (features appear larger).

Small-scale map

A “zoomed-out” map showing a large area with less detail (features appear smaller).

Map projection

A method of transferring Earth’s curved surface onto a flat map; always introduces some distortion.

Projection distortion

Inaccuracy introduced by a projection, potentially affecting area, shape, distance, and/or direction.

Reference map

A map showing locations of places and physical features (countries, rivers, cities), mainly for orientation and context.

Thematic map

A map focused on one topic or dataset (e.g., population density, language, election results) to reveal spatial patterns.

Choropleth map

A thematic map using colors/shading to show data values by area unit; best for rates/percentages rather than raw totals.

Dot density map

A thematic map using dots to represent counts (each dot equals a set amount), useful for showing clustering and distribution.

Proportional symbol map

A thematic map using symbols sized to represent quantities, useful for comparing totals across places.

Isoline (isopleth) map

A map using lines to connect points of equal value (e.g., temperature, pressure, or travel time).

Cartogram

A map that distorts area sizes to represent a variable (e.g., population or GDP), emphasizing comparison but reducing geographic familiarity.

Flowline map

A map using arrows/lines to represent movement (migration, trade, commuting) and often magnitude of flows.

Global Positioning System (GPS)

A satellite-based system that determines precise location on Earth; accuracy can vary with signal conditions and devices.

Remote sensing

Collecting information about Earth from a distance (often via satellites/aircraft) to measure change and conditions across large areas over time.

Geographic Information System (GIS)

A computer-based system for storing, analyzing, and displaying spatial data, especially by overlaying multiple data layers.

Quantitative data

Numerical data answering questions like how many/how much/how often/what percent; supports comparison and pattern identification.

Qualitative data

Descriptive data capturing meanings, beliefs, identities, and experiences (e.g., interviews, observations, documents), providing depth and context.