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Selecting map projections for world maps
Selecting map projections is challenging for many cartographers. John P. Snyder published a hierarchical decision tree in 1987, which is a systematic selection guideline for projections at all scales. Projection Wizard is an online projection selection tool available at projectionwizard.org. It is based on a modified version of Snyder’s guideline. For world maps, Projection Wizard and Snyder’s guideline both suggest a list of different map projections instead of a single “best” projection, because no hard rules for selecting world map projections exist. There has never been an agreement among cartographers on a best choice for world map projections, because personal taste, aesthetic preferences and layout constraints are relevant selection criteria. This presentation discusses additional selection criteria for selecting projections for world maps.