18 2Built systems, built areas, and whole regions
Number of greenspace wedges and built-area lobeson perimeter of metropolitan areaLondonBerlin+Rome+Bucharest+Stockholm+Barcelona+NantesChicago+San Diego/Tijuana+Philadelphia+Ottawa•EdmontonPortlandAtlanta- Mexico City
SantiagoBrasilia+TegucigalpaIquitos- Cairo
*
Nairobi+Bamako+East LondonAbecheBeijing*
MoscowSeoul*
Te h r a n*
Sapporo+UlaanbaatarErzurumKagoshimaBangkokKuala Lumpur+CuttackSamarindaCanberra•Rahimyar KhanEurope North
AmericaLatin
AmericaAfrica West-East
AsiaSouth Asia-
AustraliaAverageGeographic area, with cities from large to small population9 7 5 3 1 0
= Greenspace wedges
= Built-area lobesFigure 7.10Greenspace wedges and built lobes of metropolitan area relative to
geography and city size. Major greenspace wedges or coves projecting into a metro
area are≥40 % of the average radius of a metro area (wedge length measured from
a line connecting the tips of adjacent metro-area built lobes). Some wedges included
mainly result from a large river bisecting the metro-area (See Color Figures 2--39).
Major built lobes are≥40 % of the average radius of a metro area (lobe length
measured from the ends of adjacent wedges or coves). See Figure 7.2 caption.wedges provide connectivity for walking and bicycling, as well as accessibility to
greenspaces outside the metro area. Furthermore, green wedges serve as major
routes for species to enter and populate greenspaces in the metro area. There-
fore, in addition to the remarkable recreation benefits provided, green wedges
may be the best strategy to provide a richness of nature throughout the city.