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Shapefiles come with easy to follow instructions to download ArcExplorer, Free GIS map viewer. We provide step by step instructions so you can easily learn how to use and view maps. For more help, each shapefile is packaged with our tutorial and Atlas GIS Learn2Map.

A note about how your GIS maps are

The image (s) on this page are examples of how these shapefiles may seem when loaded into a GIS program. Your GIS maps may not be entirely true. Each GIS software is different. Own shapefiles are a collection of points, lines or polygons. They have no attributes. It is up to you, the user, to define the color, line width, symbols and other attributes within the limits and capabilities of GIS software you are using.

About the quality, accuracy and appropriateness

These data can come from a variety of private sources of government and self-reports. While we try to ensure the accuracy of this material, we can not promise that it is absolutely accurate. We are committed to using the map layer will be fun, entertaining and educational. Beyond this, there is no guarantee as to its suitability for any purpose. We assume no responsibility for any errors or inaccuracies. Please understand that the use of these layers of maps and data at your own risk.

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You did not find what you wanted? We have been online since 1996 and created 1,000 pages. Search below and you can find exactly what they are looking for.The Large Dams of the United States map layer is a subset of the 2005 National Inventory of Dams, taken by the National Atlas of the United States®. Lists and describes more than 8,100 large dams in the United States, Puerto Rico and the US Virgin Islands. The main dams are dams of 50 feet or more in height, dams with a storage capacity of 5,000 acre-feet or more standard, and dams with a maximum storage capacity of 25,000 acre-feet or more. Descriptive information includes the name of the dam and the location, the level of risk associated with the dam, the purposes for which the dam was built, and the type of prey.
With these files you can get more detailed information about the dam and its condition anywhere in the Storm Prediction Center States.The (SPC), one of the National Centers for Environmental Prediction, serious and dangerous climate studies, including rain and snow, weather phenomena fires, thunderstorms and tornadoes. The SPC uses advanced technology to provide predictions of tornado watches and warnings for the contiguous United States, and other information to be used by many groups such as meteorologists, emergency management and the aviation industry. As part of their research, the statistical data collected from databases Tornado Tornado and storm SPC data / National Weather Service severe storm.
The United States Tornado Touchdown Points 1950-2008 map layer includes tornado touchdown points for tornadoes that occurred in the United States, Puerto Rico and the US Virgin Islands. Descriptive information includes the latitude and longitude points touchdown and takeoff, the number of fatalities or wounded, an estimate of the costs of damage, and the classification of the storm on the Fujita Tornado Damage Scale.

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