Open Access

Table 1

Strategic use of different urban green coverage (UGC).

UGC Green open spaces Trees Green roofs Vertical greening
Shades canyon surfaces? Yes, if grass rather than concrete Yes Shades roof, not internal canyon surfaces Yes
Shades people? Yes, if treed Yes No, only very intensive green roofs No
Increases solar reflectivity? Yes, when grassed Yes Yes, if plants healthy Yes
Evaporative cooling? Yes, with water Yes (Unless severe drought) Yes, with water when hot Yes, with water when hot
  No, without water   No, without water No, without water
Priority locations • Wide streets with low buildings − both sides • Wide streets, low buildings − both sides • Sun exposed roofs • Canyon walls with direct sunlight
  • Wide streets with tall buildings − sunny side • Wide streets, tall buildings − sunny side • Poor insulated buildings • Narrow or wide canyons where trees are unviable
    • Green open spaces • Low, large buildings  
      • Dense areas with little available ground space  

Source: [13].

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