The nonreflective, black surface of the Pacific Ocean creates a sharp boundary along the southern California coastline. This inherent characteristic of color infrared film helps to identify several small estuaries along the coast. A small color change (gray with little sign of vegetation) exists near Camp Pendleton Marine Corps Base. Discernible are parts of Interstate Highway 5, which parallels the coast, and Interstate Highway 15, a north-south highway connecting San Diego and Riverside. Part of the street grid pattern of Escondido lies adjacent to Interstate Highway 15, which is evident near the southern edge of the photograph.