Contour line: A contour line is a specific type of isoline that connects points of equal elevation on a topographic map.
Choropleth map: A choropleth map is another type of thematic map that uses colors or shading to represent different values for specific geographic areas, such as countries or states.
Spatial distribution: Spatial distribution refers to how things are arranged across space. It involves analyzing the pattern and density of occurrences in relation to their geographic location.