Topographic map scale. Topoview highlights one of the usgss most important and useful products the topographic map. The distinctive character istic of a topographic map is that the. Reading topographic maps a free on line book on how to read topographic maps and use a compass. 124000 digital raster quadrangles.
The national map small scale collection. These maps allow you to quickly locate your position estimate your travel time and problem solve if you get off course. However the national map tnm recognizes the importance of continuing to make a collection of the small scale datasets originally developed for the national atlas available to users. In 1879 the usgs began to map the nations topography.
This page presents a 124000 scale usgs topographic quadrangle map showing the entire project area and surrounding landscape to approximately mile. The structures over 50 years of age in close proximity to the project are also clearly indicated. For example on a 1100000 scale map 1cm on the map equals 1km on the ground. The project area is circled on the map showing where different kinds of work are going to occur.
Map scale refers to the relationship or ratio between distance on a map and the corresponding distance on the ground. 1100000 digital raster quadrangles. A topographic map is a two dimensional representation of a three dimensional land surface. A map is a representation of the earth or part of it.
The ability to accurately interpret topographic maps is a foundational skill for successful navigation and route finding. Historically the development of highly accurate detailed topographic maps has largely been driven by military requirements. A graphic scale is a ruler printed on the map and is used to convert distances on the map to actual ground distances. The 1997 2014 edition of the national atlas of the united states was retired in september 2014.