Thematic or Distribution Maps: Dot Map, Choropleth & Isopleth Map | How to Plot?

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The choropleth maps are also drawn to depict the data characteristics as they are related to the administrative units. These maps are used to represent the density of population, literacy/growth rates, sex ratio, etc.
(a) Arrange the data in ascending or descending order.
(b) Group the data into 5 categories to represent very high, high, medium, low and very low concentrations.
(c) The interval between the categories may be identified on the following formulae i.e., Range/5 and Range = maximum value - minimum value.
(d) Patterns, shades or colour to be used to depict the chosen categories should be marked in an increasing or decreasing order.
Construct a Choropleth map to represent the literacy rates in India
Construction
(a) Arrange the data in ascending order as shown above.
(b) Identify the range within the data. In the present case, the states recording the lowest and highest literacy rates are Bihar (47%) and Kerala (90.9%), respectively. Hence, the range would be 91.0 - 47.0 = 44.0
(c) Divide the range by 5 to get categories from very low to very high. (44.0/ 5 = 8.80). We can convert this value to a round number, i. e., 9.0
(d) Determine the number of the categories along with the range of each category. Add 9.0 to the lowest value of 47.0 as so on. We will finally get following categories :
47 - 56 Very low (Bihar, Jharkhand, Arunachal Pradesh, Jammu and Kashmir)
56 - 65 Low (Uttar Pradesh)
65 - 74 Medium (Nagaland, Karnataka, Haryana, West Bengal, Sikkim, Gujarat, Punjab, Manipur, Uttarakhand, Tripura, Tamil Nadu)
74 - 83 High (Himachal Pradesh, Maharashtra, Delhi, Goa)
83 - 92 Very high (Mizoram, Kerala)
(e) Assign shades/pattern to each category ranging from lower to higher hues
Data related to the administrative units are represented using choropleth maps. However, the variations within the data, in many cases, may also be observed on the basis of natural boundaries. For example, variations in the degrees of slope, temperature, occurrence of rainfall, etc. possess characteristics of the continuity in the data. These geographical facts may be represented by drawing the lines of equal values on a map. All such maps are termed as Isopleth Map. The word Isopleth is derived from Iso meaning equal and pleth means lines. Thus, an imaginary line, which joins the places of equal values, is referred as Isopleth. The more frequently drawn isopleths include
Chapters:
0:00 Thematic or Distribution Maps
0:23 Use of Distribution Maps
1:21 Requirements for Drawing a Distribution Map
1:45 Rule for Drawing a Thematic Map
2:47 Qualitative Versus Quantitative Map
3:24 Dot Maps
5:36 Choropleth Maps
9:22 Isopleth Maps
#thematicordistributionmaps #useofdistributionmaps #requirementsfordrawingadistributionmap #rulefordrawingathematicmap #qualitativeversusquantitativemap #dotmaps #choroplethmaps #isoplethmaps #examrace #examrace #upsc #ugcnet

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