IMPERVIOUS FEEDER ZONES
Pierce County elementary schools symbolized by stars relative to their feeder zones represented by Thiessen polygons. Chloropleth categorization is determined by the percentage of impervious surface that makes up the school grounds.
Primary data was sourced from Pierce County Open GeoSpatial Data Portaland Washington GeoSpatial Open Data Portal
Figure 1: Northwest corner of Pierce where it intersects with the Puget Sound, illustrated by Hydrography Data from Department of Natural Resources.
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Figures 2 and 3 show the chlorepleth designations for the percent of impervious surface within the feeder zone Thiessen polygons. The highest percentage of impervious surface in Pierce County is symbolized with red (63.6%-84.6%) and the least amount of impervious surface is symbolized with dark green (0%-19.5%)
Figure 4: Pierce County Elementary schools within their individual Thiessen polygons are symbolized by black stars. By referencing both the star location and the color designation for impervious surface percentage, we can hypothetically determine risks of school ground flooding, among other things.
Figure 5: In this alternative, additional map, the same school feeder zones are categorized by size of school grounds rather than percentage of impervious surfaces.
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Figure 5
