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From approximately 1947–1992, the USGS produced the 7.5 minute series, with each map covering an area one-quarter of the older 15-minute quad series, which it replaced. [1] A 7.5 minute quadrangle map covers an area of 49 to 70 square miles (130 to 180 km 2 ). [ 2 ]
DOQs produced by the USGS cover an area measuring 7.5-minutes longitude by 7.5-minutes latitude (the same area covered by a USGS 1:24,000-scale topographic map, also known as a 7.5-minute quadrangle) or 3.75-minutes by 3.75-minutes.
Each of these quadrangles covers the area contained within 32 maps in the 7.5-minute series. The 1:100,000 scale series is unusual in that it primarily employs the metric system. One centimeter on the map represents one kilometer of distance on the ground. Contour intervals, spot elevations, and horizontal distances are also specified in meters.
Topographic maps are also commonly called contour maps or topo maps. In the United States, where the primary national series is organized by a strict 7.5-minute grid, they are often called or quads or quadrangles. Topographic maps conventionally show topography, or land contours, by means of contour lines.
The Dumbarton Bridge as seen from Skeggs Point.. Skeggs Point is a scenic turnout in San Mateo County along State Route 35 between Kings Mountain and State Route 84.The feature is marked with a guide sign along the road and is listed on the USGS 7.5 minute quadrangle, "Woodside, California" as well as in the National Geographic Names Database.
The service is the largest digital distribution platform for PC games, with an estimated 75% of the market share in 2013 according to IHS Screen Digest. [2] By 2017, game purchases through Steam totaled about US$ 4.3 billion, or at least 18% of global PC game sales according to Steam Spy . [ 3 ]
The "tower defense" aspect of the game revolves around the player character defending the storm shield against zombie like creatures.Fortnite: Save the World is described as a unique blend of sandbox survival co-op lite RPG tower defense game, and is an amalgamation of player progression, exploration, scavenging items, sharing scarce resources, crafting weapons, building fortified structures ...
OpenStreetMap (abbreviated OSM) is a free, open map database updated and maintained by a community of volunteers via open collaboration. [4] Contributors collect data from surveys, trace from aerial photo imagery or satellite imagery, and import from other freely licensed geodata sources.