Distance, Area, and Gradient (Grade 12 NSC Matric Geography): Flashcards
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Three main mapwork calculation types
Three main mapwork calculation types
Distance, area, and gradient
Distance formula (mapwork)
Distance formula (mapwork)
AD = MD × S (Actual = Map × Scale)
Topographic map scale (typical)
Topographic map scale (typical)
1:50,000 (1 cm = 0.5 km)
Orthophoto scale (typical)
Orthophoto scale (typical)
1:10,000 (1 cm = 0.1 km)
Straight line vs actual distance difference
Straight line vs actual distance difference
Straight is direct; actual follows path curves
Area formula (mapwork)
Area formula (mapwork)
A = L × B (Area = Length × Breadth)
Gradient formula
Gradient formula
G = H/D (Gradient = Height/Distance)
How gradient is expressed
How gradient is expressed
As a ratio (e.g., 1:20)
Area calculation units
Area calculation units
Square kilometres (km²) or square metres (m²)
Topographic map: cm to km conversion
Topographic map: cm to km conversion
Multiply map distance by 0.5
