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  2. Col (meteorology) - Wikipedia

    en.wikipedia.org/wiki/Col_(meteorology)

    A col, also called saddle point or neutral point, is in meteorology, the point of intersection of a trough and a ridge in the pressure pattern of a weather map. It takes the form of a saddle where the air pressure is relatively higher than that of the low-pressure regions, but lower than that of the anticyclonic zones.

  3. Saddle (landform) - Wikipedia

    en.wikipedia.org/wiki/Saddle_(landform)

    When, and if, the saddle is navigable, even if only on foot, the saddle of a (optimal) pass between the two massifs, is the area generally found around the lowest route on which one could pass between the two summits, which includes that point which is a mathematically when graphed a relative high along one axis, and a relative low in the ...

  4. Digital Chart of the World - Wikipedia

    en.wikipedia.org/wiki/Digital_Chart_of_the_World

    The Digital Chart of the World (DCW) is a comprehensive digital map of Earth. It is the most comprehensive geographical information system (GIS) global database that is freely available as of 2006, although it has not been updated since 1992.

  5. Potential energy surface - Wikipedia

    en.wikipedia.org/wiki/Potential_energy_surface

    The 2-D plot shows the minima points where we find reactants, the products and the saddle point or transition state. The transition state is a maximum in the reaction coordinate and a minimum in the coordinate perpendicular to the reaction path. The advance of time describes a trajectory in every reaction. Depending on the conditions of the ...

  6. Stationary point - Wikipedia

    en.wikipedia.org/wiki/Stationary_point

    The stationary points are the red circles. In this graph, they are all relative maxima or relative minima. The blue squares are inflection points.. In mathematics, particularly in calculus, a stationary point of a differentiable function of one variable is a point on the graph of the function where the function's derivative is zero.

  7. Saddle point - Wikipedia

    en.wikipedia.org/wiki/Saddle_point

    A saddle point (in red) on the graph of z = x 2 − y 2 (hyperbolic paraboloid). In mathematics, a saddle point or minimax point [1] is a point on the surface of the graph of a function where the slopes (derivatives) in orthogonal directions are all zero (a critical point), but which is not a local extremum of the function. [2]

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  9. List of map projections - Wikipedia

    en.wikipedia.org/wiki/List_of_map_projections

    The straight-line distance between the central point on the map to any other point is the same as the straight-line 3D distance through the globe between the two points. c. 150 BC: Stereographic: Azimuthal Conformal Hipparchos* Map is infinite in extent with outer hemisphere inflating severely, so it is often used as two hemispheres.