When these convergence points are instead mapped as lines, landmasses are stretched East-West, which means that to maintain the same area, landmasses must be compressed in the opposite direction. ![]() Recall that lines of longitude on the globe converge at the poles. This is because the poles of Earth (North and South) are represented as lines the same length as the equator. In Figure 5.5.1 below, shape distortion is most pronounced near the top and bottom of the map. Unfortunately, when areal relationships are maintained, shapes of landmasses will inevitably be distorted-it is impossible to maintain both. Australia) can be properly made on equal area maps. This means that comparisons between sizes of land-masses (e.g., North America vs. EquivalentĮquivalent projections preserve areal relationships. The projection you choose will depend on the characteristics most important to be preserved, given the purpose of your map. These include equivalent projections (which preserve areal relationships), conformal projections (angular relationships), azimuthal projections (directional relationships), and equidistant projections (distance relationships). ![]() Even so, projections can be designed to preserve certain types of relationships between features on maps. All map projections distort the landmasses (and waterbodies) on Earth’s surface in some way.
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