What is the main characteristic that differentiates an extra high intensity soil map from a high intensity soil map?

The key characteristic that distinguishes an extra high intensity soil map from a high intensity soil map is the minimum size delineation. This reflects the level of detail in the soil mapping process. In extra high intensity maps, the minimum size of the delineated areas (or mapping units) is smaller compared to high intensity maps, allowing for a more granular and precise representation of soil variability within a given area.

This increased resolution means that extra high intensity soil maps can display more specific soil features and variations, which is particularly useful for applications like site evaluation for septic systems or other land use planning, as it can impact the design and placement of such systems.

Other aspects such as the soil taxonomic unit, map scale, and type of soil evaluated are important in their own contexts but do not specifically address the fundamental difference in the level of detail defined by the minimum size delineation. Thus, identifying this characteristic is crucial for anyone looking to understand the nuances of soil mapping and its practical applications.