Geographic Skills and Inquiry
Geographic Skills and Inquiry
This domain tests how geographers collect, map, analyze, and interpret spatial data. Expect map reading, scale calculations, coordinate systems, GIS and remote sensing, sampling, and data-quality judgments.
Core rules
- Map scale: large-scale maps show small areas in more detail; small-scale maps show large areas with less detail. A 1:24,000 map is large-scale relative to 1:1,000,000.
- Coordinate systems: latitude measures north–south (0° at Equator); longitude measures east–west (0° at Prime Meridian); GPS uses satellites.
- Map types: choropleth (shaded administrative units), isoline (lines of equal value), dot density, proportional symbol, cartogram (distorts area by value).
- GIS: layers, vector vs. raster, overlay analysis, buffering, spatial join.
- Remote sensing: resolution types-spatial, spectral, temporal, radiometric.
- Inquiry: define question, collect data, analyze pattern, evaluate error, communicate.
Worked example
On a 1:50,000 map, two towns are 6 cm apart. What is the ground distance? Reasoning: 1 cm represents 50,000 cm; 6 cm represents 300,000 cm. Convert: 300,000 cm ÷ 100,000 cm/km = 3 km. The key is keeping units consistent and remembering that the map ratio is unitless.
Traps
- Reversing large-scale and small-scale terminology.
- Forgetting to convert centimeters to kilometers.
- Treating a choropleth as showing individual points rather than aggregated rates.
- Assuming higher resolution is always better regardless of cost or purpose.
- Confusing latitude and longitude order in coordinates.