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  2. Quadrangle (geography) - Wikipedia

    en.wikipedia.org/wiki/Quadrangle_(geography)

    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]

  3. Topographic map - Wikipedia

    en.wikipedia.org/wiki/Topographic_map

    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.

  4. Digital orthophoto quadrangle - Wikipedia

    en.wikipedia.org/wiki/Digital_orthophoto_quadrangle

    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.

  5. The National Map - Wikipedia

    en.wikipedia.org/wiki/The_National_Map

    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 ...

  6. United States Geological Survey - Wikipedia

    en.wikipedia.org/wiki/United_States_Geological...

    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).

  7. Dotsero - Wikipedia

    en.wikipedia.org/wiki/Dotsero

    Shaded relief map of Dotsero maar area combined with USGS Dotsero 7.5-minute topographic map. Geology The most prominent feature of the Dotsero maar and scoria cone ...

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