Drainage Basins, Patterns and Density
Learn to recognise dendritic, trellis, radial and rectangular drainage patterns, and read what drainage density tells you about the rock and soil beneath.
Build a mapwork checklist covering scale, bearings, coordinates, contours and orthophotos, plus the GIS ideas that go with them.
By the end, you can
identify the main mapwork techniques and explain the core GIS concepts used in map interpretation.
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Mapwork Essentials and GIS
The predictable part of the paper
Mapwork rewards preparation more than any other section, because the same handful of techniques come up every year in slightly different clothes. 🗺️
Learn the toolkit once and you can walk into the paper knowing what you will be asked to do, even though you have never seen that particular map.
South African topographic maps are usually 1:50 000, and the orthophoto that accompanies them is usually 1:10 000.
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Mapwork Essentials and GIS
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Next on the Geography path · step 3 of 11
Berg Winds, Heat Islands and Urban Air
12 min · R19
Learn to recognise dendritic, trellis, radial and rectangular drainage patterns, and read what drainage density tells you about the rock and soil beneath.
Learn how Highs and Lows differ in pressure, vertical air movement and surface circulation, and why each brings the weather it does.
Practise reading evidence off a map — climate, river stage, economic activity and settlement — instead of answering from memory.
Understand why opposite slopes heat differently, how cold air collects on a valley floor, and how anabatic and katabatic winds develop.
Learn the four mapwork calculations, the formula for each, and how to check an answer is sensible before you write it down.
The whole Geography path → All High School MicroQuests → Browse all 134 →
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Mapwork Essentials and GIS
Free · 13 min · certificate