![]() ![]() It can be applied to printed maps and to computer mapping and other (GIS) applications. ![]() The USNG is intended to supplement-not to replace-other location systems such as street addresses. It is also designed to be both flexible and scalable so that location references are as compact and concise as possible. It is intended to provide a frame of reference for describing and communicating locations that is easier to use than latitude/longitude for many practical applications, works across jurisdictional boundaries, and is simple to learn, teach, and use. The goal of the USNG is to provide a uniform, nationally consistent rectangular grid system that is interoperable across maps at different scales, as well as with GPS and other location based systems. However, these grids, if non-standard or proprietary (such as so-called "bingo" grids with references such as "B-4"), are typically not interoperable with each other, nor can they usually be used with GPS. Paper maps often are published with overlaid rectangular (as opposed to latitude/longitude) grids to provide a reference to identify locations. This can improve human comprehension by providing reference of scale, as well as making actual distance computations more efficient. As such, they are often better served by a local Cartesian coordinate system, in which the coordinates represent actual distance units on the ground, using the same units of measurement from two perpendicular coordinate axes. While latitude and longitude are well suited to describing locations over large areas of the Earth's surface, most practical land navigation situations occur within much smaller, local areas. The USNG was adopted as a national standard by the Federal Geographic Data Committee (FGDC) of the US Government in 2001. It is similar in design to the national grid reference systems used in other countries. It provides a nationally consistent "language of location", optimized for local applications, in a compact, user friendly format. The United States National Grid (USNG) is a multi-purpose location system of grid references used in the United States. ![]()
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