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In the making of topographic maps, the USGS subdivides the United States by using Latitude and Longitude lines to form the boundaries of four-sided figures called “quadrangles”. The maps are often referred to as quadrangle maps (or quad maps).
Some of the most well-known USGS maps are the 1:24,000-scale topographic maps, also called 7.5-minute quadrangles . In 2009, the USGS transitioned from our hand scribed historical topographic maps to US Topos , which are computer-generated on a regular schedule using national databases...
Download free USGS topographic map quadrangles in georeferenced PDF (GeoPDF) format by clicking on "Map Locator" on the USGS Store Web site. These files were created using high-resolution scans and average 10-17 megabytes in size.
A "quadrangle" is a topographic map produced by the United States Geological Survey (USGS) covering the United States. The maps are usually named after local physiographic features. The shorthand " quad " is also used, especially with the name of the map; for example, "the Ranger Creek, Texas quad".
What is a quadrangle map or “quad” map? Quadrangle maps or quads are a type of topographic map produced by the United States Geological Survey (USGS) that divides the United States into areas or quadrangles bounded by lines of latitude and longitude.
USGS Quad Maps provide a wealth of information about the local geography, including mountains, rivers, forests, and protected areas. By studying these maps, ecotourists gain a deeper understanding of the landforms, ecosystems, and biodiversity hotspots specific to their chosen destination.
Topographic maps are detailed maps that represent the graphics features on the Earth's surface. The map uses contours lines to represent relief and other geographic features such as infrastructural development, water bodies, buildings, and other prominent features.