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In addition to the above, the rasterization of elongated water body polygons (and other barriers to movement stored as polygons) does not always generate continuous surfaces, unlike when rasterizing vector lines. Figure 5 below provides an illustration of such a problem. As we can see in Figure 5c, working with lower resolution (larger grid sizes) will create discontinuities, therefore generating artificial bridges in these areas.

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captionImpact of rasterization on elongated polygons (a) for a resolution of 180 meters (b) and 1 kilometer (c).