Ptolemy Did Not Need Be Concerned About Distortion From Projections Because His Map Was Based On

Converting a sphere to a flat surface results in distortion. While better than marinus' simple projection, this conic projection—a prototype of a projection now known as the 'bonne pseudoconic projection'—is limited in practice to mapping either the northern or the southern hemisphere on any one map. Ptolemy did not need be concerned about distortion from projections because his map was baseed on:

Ptolemy developed instructions for three projections, but only the first two projections were used in practice. The first projection is (except for the modification south of the equator) a true conic projection; Converting a sphere to a flat surface results in distortion.

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The second is not, but for the segment covered by the map is a remarkably good approximation to the true conic projection that was later developed from it (the bonne projection, which preserves distances along all parallels). Request pdf | ptolemy's methodological principles in the creation of his map projections | ptolemy developed instructions for three projections, but only. While better than marinus' simple projection, this conic projection—a prototype of a projection now known as the 'bonne pseudoconic projection'—is limited in practice to mapping either the northern or the southern hemisphere on any one map. This was only a minor concern for ptolemy, since he applied this projection technique only rigorously to the known, northern hemisphere.