Map Projection Page


Outline

  1. Common Map Projections with ArcGIS
  2. Map Projection Animations from the Web

 


Common Map Projections with ArcGIS


The Mercator projection is conformal. It preserves angular relationships but distorts area.


Also conformal, the oblique or transverse Mercator does not use the equator as the standard line. It preserves angular relationships but distorts area.


The sinusoidal projection is equivalent. It preserves area relationship but distorts angles.


The Molleweide projection is equivalent. It preserves area relationships but distorts angles. However, angles are not distorted as much as with the sinusoidal projection.


The Goode's Homolosine projection in an interrupted projection that combines both the Mollweide and sinusoidal projects. The top and bottom of the map, above 60¡ N and S latitude, is from the Mollweide. The middle of the map is from the sinusoidal.


The Alber's equal area projection is commonly used for page size maps of the United States.


The Gnomonic projection shows the great circle as a straight line.

Map Projection Animations from the Web


The normal perspective animation of the Mercator simply changes the longitude.


The animation of the oblique perspective Mercator shows the problems with area distortion over different continents.


The oblique version of the azimuthal equidistant. The projection shows distances correctly from the mid-point to outside locations.


The polyconic works well for the mid-latitudes. The animation shows that the projection displays some serious distortions.


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