Final answer:
In topographic representation, 1 barrel can be considered equivalent to 1 dot to represent the location of a mouse.
Step-by-step explanation:
In topographic representation, 1 barrel can be considered equivalent to 1 dot. This means that when representing a mouse on a topographic map, 1 dot can represent the location where the mouse is. The dot is used to indicate the presence of the mouse without providing any information about its size or specific details.