Thematic Mapping - Quick Revision Sheet
Quick revision
| Term | Meaning |
|---|---|
| Thematic map | Map emphasizing a particular theme, such as distribution of population |
| Dot method | Represents absolute numbers; each dot has a value |
| Dot size | Round, uniform, about 1 to 1.5 mm diameter |
| Negative lands | Unproductive lands (marshy areas, lakes, river beds) left without dots |
| Choropleth | Shades or tints over administrative units; light = low, dark = high density |
| Categories | 5: very high, high, medium, low, very low |
| Interval | Range/5; Range = maximum - minimum |
Key facts
- Five types: choropleth, isopleth, proportional symbol, dot, chorochromatic.
- 1854: John Snow's cholera map of London, the first thematic map for problem analysis.
- Example 11.1: 1 dot = 1,000,000 persons; Tamil Nadu 76 dots.
- Example 11.2: literacy range 91.75 - 68.54 = 23.21; Dharmapuri alone below 70.
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