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diff --git a/docs/source/glossary.rst b/docs/source/glossary.rst new file mode 100644 index 00000000..92b75ecd --- /dev/null +++ b/docs/source/glossary.rst @@ -0,0 +1,41 @@ +.. _glossary:: + +================================================================================ +Glossary +================================================================================ + +.. glossary:: + + Pseudocylindrical Projection + + Pseudocylindrical projections have the mathematical characteristics of + + .. math:: + + \begin {array} + + x &= f(\lambda,\phi) + + y &= g(\phi) + + \end {array} + + where the parallels of latitude are straight lines, like cylindrical + projections, but the meridians are curved toward the center as they + depart from the equator. This is an effort to minimize the distortion + of the polar regions inherent in the cylindrical projections. + + Pseudocylindrical projections are almost exclusively used for small + scale global displays and, except for the Sinusoidal projection, only + derived for a spherical Earth. Because of the basic definition none of + the pseudocylindrical projections are conformal but many are equal + area. + + To further reduce distortion, pseudocylindrical are often presented in + interrupted form that are made by joining several regions with + appropriate central meridians and false easting and clipping + boundaries. Interrupted Homolosine constructions are suited for showing + respective global land and oceanic regions, for example. To reduce the + lateral size of the map, some uses remove an irregular, North-South + strip of the mid-Atlantic region so that the western tip of Africa is + plotted north of the eastern tip of South America. |
