Final answer:
The question notably mixes terms from golf and physics. In physics, isolines are used to visualize fields by connecting points of equal value for related quantities such as elevation for gravitational fields or potential for electric fields. These lines represent equal gravitational or electric potential, termed gravitational and electric equipotential lines respectively.
Step-by-step explanation:
The student's question seems to refer to the concept of 'ground under repair' which might be misunderstood as a physics concept related to field mapping. However, this phrase typically refers to a term used in golf to denote an area of the golf course being repaired and not a physics concept. In regard to physics, when physicists construct a map of isolines, they are connecting points of equal value for some quantity related to a field. These isolines help to visualize fields such as gravitational or electric fields. For example, isolines on a topographic map, known as contour lines, represent lines of equal gravitational potential energy per unit mass, which is analogous to gravitational equipotential. As the distance between isolines decreases, the change in gravitational potential energy occurs over a shorter distance, indicating a steeper slope. Similarly, isolines in an electric field represent lines of equal electric potential, known as equipotential lines.