Introduction a: A knowledge of map symbols, grids, and scale and distance gives enough information to identify two points, locate them, measure between them, and determine how long it would take to travel between them. But what happens if there should be a 300-foot cliff between the two points? The irregularities of the earth’ s surface, known as elevation and relief, are important items of military information with which the Introduction a: A knowledge of map symbols, grids, and scale and distance gives enough information to identify two points, locate them, measure between them, and resolve how long it would take to travel between them. But what happens if there should be a 300-foot cliff between the two points? The irregularities of the earth ’s surface, known as elevation and relief, are important items of military information with which the