The term projection has several different, but similar, meanings. A few examples should help clarify the term. First, suppose we are given an object O that is specified as a subset of Euclidean three-dimensional space (E3), and a plane P in E3. The map...

One method of projection. © . Reproduced by permission. Because the earth is a sphere, all flat maps of its surface contain inherent distortions. Map...

A map projection is any method used in cartography to represent the two-dimensional curved surface of the earth or other body on a...

What does the Earth really look like? The maps on these pages show three different drawings of the world. Why are these maps so different from each other? It's a question of perspective, or viewpoint. It is impossible to show the curved...

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Under a murky, low-hanging sky, the Lacey Marie pitches to and fro on choppy Lake Borgne, using sonar to map a muddy bottom littered with rusted-out cars, boats, oil platforms, washing machines and other junk swept into the water by Hurricane Katrina 18 months ago.The...

Towering above the modern streets and buildings of Irbil, the citadel's narrow alleyways and dusty courtyards stand almost deserted. Its mud-brick houses, built atop layers of ancient civilizations stretching back through millennia, are crumbling.Irbil's citadel, claimed to be one of the longest continuously inhabited urban...