An Investigation of the Significant Criteria of Vegetation Selection and Planting Arrangement in Designing Urban Nodes

Unresponsive design guidelines for open spaces and the continuous allocation of land for the construction of buildings has led to the ‘concretisation’ of urbanscapes. This has resulted in the urban heat island effect marking the increase in air temperature making urban spaces almost unbearable for urban residents to dwell in. However, new effort is being made to reduce the effect of heat gain at the pedestrian level by planting vegetation in open spaces particularly urban nodes to create a comfortable outdoor environment. Appropriate vegetation selection in landscape design which is capable of reducing outdoor air temperature, is needed in designing urban nodes in hot-humid climates. The study is aimed to investigate the effectiveness of different vegetation types and their planting arrangement in adequately shading outdoor spaces for pedestrian activities. Two node intersections in Kuala Lumpur’s urban space were selected based on vegetation type and planting arrangement. Daylight intensity was measured using the lux meters and the shadow casted underneath the vegetation. Human activity within the area was also observed to determine which vegetation type and planting arrangement is most suitable for pedestrian activity. Results revealed that the vegetation types and its planting arrangements significantly influences the amount of daylight penetrating the tree foliage and shadow casted on the ground which encourages human interaction at the node intersections.