Explanation
Option (b) is correct: An isopleth map is a type of thematic map that uses lines (isopleths) to connect points of equal value of a particular variable. These maps are ideal for visualizing data that changes gradually across a geographical area, like pressure. Lines (isopleths) link points of identical values, such as isobars (equal pressure), isotherms (equal temperature), or isoheights (equal altitude). Isobars, which are lines connecting points of equal atmospheric pressure, are a classic example of data visualized using an isopleth map. Options (a), (c) and (d) are incorrect:
A choropleth map uses different shades or colors to represent statistical data across predefined areas, such as population density by country or state. Chorochromatic Map also known as area-class maps, chorochromatic maps depict regions of different categories using various colors, often representing qualitative data like land use or vegetation types.For example a map showing different colors for various land cover types, such as forests, urban areas, and water bodies. Choroschematic maps simplify spatial relationships using schematic representations, often abstracting geographic details to highlight specific information. It may not adhere to strict geographic accuracy. Example: A transit map illustrating subway lines and stations without accurate geographic scaling.