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Figure 2.11.1 The geographic coordinate system. Longitude specifies positions east and west as the angle between the prime meridian and a second meridian that intersects the point of interest. Longitude ranges from +180 (or 180° E) to -180° (or 180° W). 180° East and West longitude together form the International Date Line.
The geographic coordinate system is designed specifically to define positions on the Earth's roughly-spherical surface. Instead of the two linear measurement scales, x and y, the geographic coordinate systems juxtaposes two curved measurement scales.
However, the geographic coordinate system, as seen in Figure 2.3, is designed specifically to define positions on the Earth's roughly spherical surface. Instead of the two linear measurement scales x and y, the geographic coordinate systems bring together two curved measurement scales.
