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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.
During the registration process, prospective volunteers submitted a list of the 7.5 minute quadrangle maps on which they wished to work. Once accepted into the project, volunteers received their assignment and 1:24,000 scale topographic map of their quad. While there was no deadline for completing maps, the project's administrators preferred ...
Each map was bounded by two parallels and two meridians spaced 15 minutes apart—the same area covered by four maps in the 7.5-minute series. The 15-minute series, at a scale of 1:63,360 (one inch representing one mile), remains the primary topographic quadrangle for the state of Alaska (and only for that particular state).
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.
Booth, Derek B.; Troost, Kathy Goetz; Shimel, Scott A. (2008), Geologic Map of Northeastern Seattle (Part of the Seattle North 7.5 X 15-minute Quadrangle), King County, Washington: Geologic Summary, United States Geological Survey; Bretz, J Harlen (1913), Glaciation of the Puget Sound Region (PDF), Washington Geological Survey.
Some hikers have argued that its location, being on public land, should be available to the public. The Bureau of Land Management and some professional archaeologists disagree with this. In recent years, the USGS has removed Moon House, among other ancient ruins, from its 7.5 minute topographical maps.
Horton Creek is a tributary of Oxbow Creek in Susquehanna County and Wyoming County, in Pennsylvania, in the United States.It is approximately 3.3 miles (5.3 km) long and flows through Springville Township in Susquehanna County and Lemon Township and Nicholson Township in Wyoming County. [1]