Another name for projections, a discussion of the different ways coordinate systems get specified and the many different standards understood by Manifold. |
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It's all about flattening a more-or-less round Earth. Nice essay on what Columbus looked like, too. |
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A short, "jump" topic with credits to the USGS publication heavily quoted, originally written by J.P. Snyder. |
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Snyder's introduction to projections. Still the best. |
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What an ellipsoid or datum is and why they are used. |
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Snyder's advice on how to pick a projection for a map. This is important so you can use the map how you want, not just to create a pretty map. |
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Extensive collection of topics illustrating the various main projections people use. |