Digital Ecosystem and Landscape Design. The Stadium City of Cagliari, Sardinia (Italy)

Increasingly articulated and sensitive is the approach to issues of conservation and/or balanced exploitation of resources because of the value of environmental quality at the basis of fundamental rights. This is demonstrated by the successive regulatory instruments: Environmental Impact Assessment (EIA, 1969), Strategic Environmental Assessment (SEA, 2001), Single Environmental Text (2006 containing the rules on environmental protection and waste management) and Agenda 2030 (2015, 17 for Sustainable Development), aimed at avoiding-containing situations of degradation and risk to the quality of life, including future generations. Among the different methodological approaches, we must also consider the Landscape Assessment to be carried out before and, in an evolutionary continuum, after the realization of a work. This in order to identify interference and impacts on the territory (with descriptive-quantitative investigation of the elements characterizing its structure from a naturalistic, anthropic and historical-cultural point of view, and perceptive investigation of the visual impact)its relations, qualities and balances. Certainly responding to the purposes of a complete and innovative landscape assessment appears to be the use, although not yet fully widespread, such as that of Open Source Tools, available without a commercial license, therefore within the reach of all: designers and evaluators. In this framework, the aim of the work is to evaluate the role of Open Source Tools in the assessment of the visual, ante and post operam impact of important urban works that require continuous information-collective participation and therefore capable of fostering the creation of shared values.