Fenn's Rule

Fenn’s Rule is a guideline used to help identify the true high spots or peaks of a surface in topographical surveys. It states that if a point on a surface is higher than all of its surrounding points within a certain radius, it can be considered a true high point, or a local maximum. This rule assists geologists and surveyors in distinguishing significant elevations from minor variations, ensuring accurate interpretation of terrain features. In essence, it helps differentiate genuine peaks from small bumps or irregularities by comparing each point to its neighbors.