Final answer:
A single overlay for depicting battlefield mobility would combine multiple data sources to analyze factors affecting movement on the battlefield. This is typically a task in the field of geography and involves geospatial analysis with GIS software.
Step-by-step explanation:
The question refers to a single overlay that combines more than one product to depict the effects on battlefield mobility. Such an overlay would typically be used in a military or strategic context to analyze and understand the different factors that affect movement and logistics on the battlefield. In geography and military science, this might involve the creation of a map or digital representation that integrates various data sources, such as terrain, weather, enemy positions, and infrastructure.
In practice, creating an effective overlay to assess battlefield mobility could involve geospatial analysis and the use of Geographic Information Systems (GIS). These systems allow for the incorporation of multiple data layers to produce a composite image or map that can help in planning and decision making. For example, combining elevation data with weather patterns can help predict the passability of terrain under different conditions. The overlay thereby contributes to a comprehensive understanding of how various factors interact to affect mobility.