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Yes, in many cases the public can access GIS Maps. The National Map Program and geoplatform.gov are two services that make these maps available to the public. Some GIS Maps, particularly those that contain sensitive information or those produced by private corporations, are not open to the public.What is the difference between a hydrological and a hydrographic GIS Map?
A hydrological map shows the distribution of water on land and in the ground, including the effects of water, such as watersheds, erosion, and springs. A hydrographic map describes the physical features and conditions of navigable waters and the shoreline, including depths and currents. Hydrographic maps are also useful for surveying underwater land terrain.What is a historical GIS Map?
A historical GIS Map is a map produced in the past that uses GIS mapping techniques. The USGS provides an online map tool to look at historical GIS Maps for any U.S. location through the USGS Historical Topographic Map Explorer. This mapping tool includes maps that date back to the 1800s, when GIS techniques were first developed.