IV-w1 map types

Types of Maps SAR might use

	Topographic maps: This is your typical USGS map. It portrays variations in terrain, heights of natural features, and the extent of vegetation cover. Relief is normally represented by contour lines. Each topographic map is commonly referred to as a 'map sheet.'
	Terrain models: This is a scale model of natural and man-made terrain features. It provides a means to visualize the terrain depicted on a map in three dimensions.
	Photo and Photomosaic maps: This is a reproduction of an aerial photograph or a series of photographs, upon which grid lines, marginal data, place names, route numbers, important elevations, boundaries, and approximate scale and direction have been added.

Trail maps have detailed information on the trails and, often, observable landmark or vegetation features that are useful to hikers. Trail maps should be used to supplement topo maps. They often include trails and other features that were not in existence at the time the corresponding USGS topo maps were last updated, but, they usually don't have the detailed terrain information, such as elevation contour lines, that are shown on the topo maps. Trail maps range from very detailed, commercially produced maps of a region to hand drawn maps passed between hikers or searchers.

Aerial photograph maps help to determine vegetation coverage of an area and may aid in determining the ability of a field team to travel through a region or probability of detection in an area.