Applicability of the norma granada method to evaluate adult trees-a case study

Abstract

The applicability of the Norma Granada method, as a tool to evaluate trees, was tested with a study case in Évora. A broad spectrum of trees found within the urban perimeter of the city was evaluated using the method. This method has been introduced throughout Spain and is slowly making its appearance in rules and regulations of the major Portuguese municipalities. So far there has not been any evidence that the direct applicability has been researched. Trees are considered to be of particular importance to the visual quality, amenity and wildlife (insects and birds) of urban space. They are able to emphasize the positive influence on climate and air in the surroundings. They reduce the amplitude of air temperature and air pollution. At the same time they are responsible for the seasonal changes (flowering, leaf colouring) that are very important for the personal wellbeing for the citizens, both physical and psychological. The fierce competition for the urban spaces and the vandalism raise conflicts with arboreal heritage, which leads to a severe pruning or tree felling. For this reason, the evaluation of urban trees in a constant concern by professionals. Until now it involves personal points of view and most often strategic reasons.