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Projection Wizard:
Map Projection Selection Tool
Bojan Šavrič
Bernhard Jenny
Helen Jenny
NACIS PCD, Pittsburgh
October 8, 2014
Furuti, C. (2013). Map Projections. Online: http://www.progonos.com/furuti/MapProj/CartIndex/cartIndex.html (accessed April 23, 2013)
Snyder’s Selection Guidelines
Snyder, J. P. (1987). Map Projections – A working manual. US government printing office: p.383.
Selection Criteria
• Extent of the geographic area
• Central latitude of the rectangle
90°
75°
60°
45°
30°
15°
0°
Latitude of central point
Selection Criteria
90°
75°
60°
45°
30°
15°
0°
Latitude of central point
World Hemisphere Continent or smaller areas
• Extent of the geographic area
Selection Criteria
• Small-scale map projection
90°
75°
60°
45°
30°
15°
0°
Latitude of central point
World Hemisphere Continent or smaller areas
WorldWorld
normal
aspect
normal
aspect
Selection Criteria
90°
75°
60°
45°
30°
15°
0°
Latitude of central point
World Hemisphere Continent or smaller areas
WorldWorld
normal
aspect
normal
aspect
AzimuthalAzimuthal
oblique
aspect
oblique
aspect
• Medium-scale map projection
Selection Criteria
• Large-scale map projection
• Aspect ratio and map orientation
• East-west extent, landscape-oriented map
• North-south extent, portrait-oriented map
• Equal extent, square-shaped map
Selection Criteria
90°
75°
60°
45°
30°
15°
0°
Latitude of central point
World Hemisphere Continent or smaller areas
WorldWorld
normal
aspect
normal
aspect
AzimuthalAzimuthal
oblique
aspect
oblique
aspect
• Large-scale map projection
Selection Criteria
• Equal extent, square-shaped map
90°
75°
60°
45°
30°
15°
0°
Latitude of central point
World Hemisphere Continent or smaller areas
WorldWorld
normal
aspect
normal
aspect
AzimuthalAzimuthal
oblique
aspect
oblique
aspect
oblique aspectoblique aspect
normal aspect
normal aspect
polar aspect
polar aspect
AzimuthalAzimuthal
Selection Criteria
90°
75°
60°
45°
30°
15°
0°
Latitude of central point
World Hemisphere Continent or smaller areas
WorldWorld
normal
aspect
normal
aspect
AzimuthalAzimuthal
oblique
aspect
oblique
aspect
transverse aspecttransverse aspect
CylindricalCylindrical
• North-south extent, portrait-oriented map
Selection Criteria
90°
75°
60°
45°
30°
15°
0°
Latitude of central point
World Hemisphere Continent or smaller areas
WorldWorld
normal
aspect
normal
aspect
AzimuthalAzimuthal
oblique
aspect
oblique
aspect
67.5°67.5°
70°
70°
AzimuthalAzimuthal
normal aspectnormal aspect
polar aspect
polar aspect
ConicConic
normal aspectnormal aspect
CylindricalCylindrical
• East-west extent, landscape-oriented map
Selection Criteria
90°
75°
60°
45°
30°
15°
0°
Latitude of central point
World Hemisphere Continent or smaller areas
CompromiseCompromise
Equidistant
Equidistant
Equal-area
Equal-area
Equidistant
Equidistant
Equal-area
Equal-area
Equidistant
Equidistant
Equal-area
Equal-area
Conformal
Conformal
• Distortion properties
Credits
• Leaflet (web map)
• National Geographic, Esri, etc. (web map tiles)
• Leaflet.draw plugin (modified)
• D3 (preview map)
• jQuery (user interface)
Thank you!
projectionwizard.org
cartography.oregonstate.edu