This is a color key to the different marks that are detected on the surface of the sand on aerial imagery. Human tracks = yellow, Dog and cat tracks = orange, Green iguana tracks = blue, 4x4s, ATVs tracks = red and Horse tracks = black. Analyzing beach use on the surface of the sand gives us a clear idea of what are the patterns of foot, vehicular and animal traffic on the surface of the sand on the areas being restored.