How many types of contour lines are there in contour mapping?

Contour mapping utilizes various types of contour lines to convey different aspects of terrain and elevation. The specific types generally include:

1. Index Contours: These are the primary lines that usually have a heavier weight and often are labeled with their elevation. They serve as a reference point for understanding the terrain's height.

2. Intermediate Contours: These lines fall between the index contours and help to show changes in elevation more precisely. They are typically lighter in weight and do not usually have numerical values associated with them.

3. Supplemental (or Imaginary) Contours: These can provide even finer details in elevation where needed, often found in densely packed areas of contour lines, helping to portray subtle changes in the landscape.

This classification system allows individuals to interpret the land accurately, identifying slopes, depressions, and other geographic features essential for navigation and planning. Understanding these types is crucial for effective terrain analysis in military operations and other applications.