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  2. 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.

  3. Contour line - Wikipedia

    en.wikipedia.org/wiki/Contour_line

    More generally, a contour line for a function of two variables is a curve connecting points where the function has the same particular value. In cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level.

  4. Contour plowing - Wikipedia

    en.wikipedia.org/wiki/Contour_plowing

    Contour plowing. Contour bunding or contour farming or contour ploughing is the farming practice of plowing and/or planting across a slope following its elevation contour lines. These contour lines create a water break which reduces the formation of rills and gullies during times of heavy precipitation, allowing more time for the water to ...

  5. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    Illusory contours or subjective contours are a form of visual illusion where contours are perceived without a luminance or color change across the contour. Impossible object: Irradiation illusion: Isometric illusion

  6. List of TV Guide covers (2010s) - Wikipedia

    en.wikipedia.org/wiki/List_of_TV_Guide_covers...

    This is a list of issue covers of TV Guide magazine from the decade of the 2010s, from January 2010 to December 2019. This list reflects only the regular weekly or bi-weekly issues of TV Guide (no one-time-only issues), and includes covers that are national or regional in nature, along with any covers that were available exclusively to print or digital subscribers.

  7. Nautical chart - Wikipedia

    en.wikipedia.org/wiki/Nautical_chart

    A nautical chart or hydrographic chart is a graphic representation of a sea region or water body and adjacent coasts or banks. Depending on the scale of the chart, it may show depths of water ( bathymetry) and heights of land ( topography ), natural features of the seabed, details of the coastline, navigational hazards, locations of natural and ...