常用的平面图有两种：

     This projection is neither equal-area nor conformal. It consists of equally spaced latitude and longitude lines, and is very often used for quick plotting of data. It is included here simply so that such maps can take advantage of the grid generation routines. Also known as the Plate Carree. Properties are the same as for the Mercator, above.

http://s2/mw690/03f96e31ge19b950f2a61&690
2.

• Miller Cylindrical

• This projection is neither equal-area nor conformal, but "looks nice" for world maps. Properties are the same as for the Mercator, above.

• http://s1/mw690/03f96e31ge19b9c4eca50&690