What does the difference in elevation between adjacent contour lines refer to?

The difference in elevation between adjacent contour lines is referred to as the contour interval. This term specifically describes the vertical distance represented by each change in contour line on a topographic map. Understanding the contour interval is crucial for interpreting the terrain's slope and elevation changes accurately.

By knowing the contour interval, one can easily assess how steep or gentle the land is, which is vital for effective site planning and analysis in architectural design. A smaller contour interval indicates a more detailed representation of minor elevation changes, while a larger interval may show more significant shifts in elevation. This concept is essential for architects and planners as it influences design choices regarding landscaping, drainage, and building placement.