Cartographic Skills and Field Study
What this domain tests
Cartographic skills and field study tests map projections, thematic mapping, graphs, data handling and the design and reporting of a small field survey. Expect choice-of-method questions and a short fieldwork plan.
Core rules
- Projections: Mercator (cylindrical, preserves direction, exaggerates high-latitude area), conical (good for mid-latitudes), zenithal (polar areas). No projection preserves shape, area, distance and direction together.
- Thematic maps: choropleth uses shaded administrative units for ratios such as density; isopleth joins points of equal value such as temperature; dot maps show distribution; flow maps show movement.
- Graphs: bar for comparison, line for trend, pie for composition. A pie sector angle = (component ÷ total) × 360°.
- Field study: define aim, choose sampling (random, systematic, stratified), prepare questionnaire or observation sheet, record location and date, map and graph the data, then write findings, limitations and conclusions.
Worked example
A village has 1,200 cultivators, 600 agricultural labourers, 200 household-industry workers and 1,000 other workers, total 3,000. Cultivators' share = 1,200 ÷ 3,000 = 40%, sector angle = 0.40 × 360° = 144°. The pie is appropriate because the four categories form a whole workforce.
Traps
Using a choropleth for point data; drawing a pie when categories overlap; forgetting the total when calculating percentages; presenting fieldwork without a stated sampling method or limitation.