The Map is not the Territory

Daniel W. Blackmon

Source for Images

• http://www.progonos.com/furuti/MapProj/Normal/TOC/cartTOC.html

Useful Map Properties

• Preserving distances (equidistant)• geodesics (great circles) • preserving directions

Useful Map Properties

• preserving shape (conformality) • preserving area (equivalence) • general distortion pattern

Useful Map Properties

• general distortion pattern(Tissot indicatrices)

• the angular deformation pattern

How projections are created, including the mathematics for

• Azimuthal orthographic• Stereographic cylindrical• Sinusoidal (Sanson-Flamsteed)

How projections are created, including the mathematics for

• Mollweide• Polar / ecuatorial azimuthal equidistant /

equal area• Aitof, Hammer and Winkel Tripel

Mercator’s Projection

Mercator’s Projection

• Rhumb line in blue• Geodesic line in red

Azimuthal Equidistant

Equitorial Sanson-Flamstead

Hobo Dyer Equal Area

Peters Equal Area

Werner’s Corniform

Oblique Azimuthal(preserves radial distances)

Normal Mollweide

Re-Scaled Mollweide