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  1. Specifically, the function used to return ‘drivable’ roads removes all routes tagged as abandoned, bridleway, bus_guideway, construction, corridor, cycleway, elevator, escalator, footway, path, pedestrian, planned, platform, proposed, raceway, service, steps, track, alley, driveway, emergency_access, parking, parking_aisle, or private; motor_vehicle = no, and motorcar = no. See the source code for further detail.↩︎

  2. Except, that is, in cases where the boundary of the urban area itself contains ‘islands’ (literal or figurative). As an example, the spatial units which comprise the island at the port of Barcelona (a cruise terminal connected by bridge to the mainland) are assigned to the same cluster as much of the mainland from which they are separated by water (thus not fulfilling the spatial contiguity criteria).↩︎

  3. In GIS terms, types can be thought of as MultiPolygons or a multipart feature: they may consist of several distinct geometries; while polygons can be thought of as the Polygons resulting from an ‘explode’ operation on a multipart feature: each polygon is one spatially contiguous geometry.↩︎

  4. As set out in the previous chapter, type describes all cells in the city with a certain cluster label, whereas polygons refer to the separate geographies of contiguous cells with a certain cluster label.↩︎

  5. Ciutat Meridiana, Vallbona, and Torre Baró in the North of the district; and Can Peguera and el Turó de la Peira in the South.↩︎

  6. Seven novel and three existing.↩︎

  7. Except in the few cases where the city boundary itself contains separate geometries, such as islands.↩︎

  8. Or to be more precise, the large majority of the type is counted as a polygon: as can be seen in Figure 4.7, it also encompasses two islands (one literal and one figurative), which are counted as separate polygons.↩︎

  9. Of the 3,721 polygons into which the ten segmentations examined here are divided, 185 (5%) have an area of more than 1 km2; 32 (0.86%) have an area of more than 5 km2; and 16 (0.43%) have an area of more than 10 km2.↩︎

  10. The notable exceptions are the spatially constrained segmentation, an exception in both type and polygon analyses; and H3 ‘basic’, an exception in the type analysis due primarily to its relatively low average type area.↩︎

  11. Literally more rows, and also a greater proportion of the total rows in the input data.↩︎

  12. In this dissertation that is: Arribas-Bel and Fleischmann’s original description of enclosed tessellation does not remove any cells and notes that the spatial-exhaustiveness of the tessellation is a key feature.↩︎