Geospatial tools for Community Engagement in the Christchurch Rebuild, New Zealand

This paper examines the implications of two geospatial tool systems, developed by the “Greening the Greyfields” research, to support local governments in encouraging community engagement in the process of decision-making for the rebuild. The two tools, Envision and ESP, allow the identification of areas of reconstruction priority, and modelling different reconstruction scenarios with 3D visualisation and precinct design assessment. The main expected outcome is that these tools will support the local government to expand the communication with stakeholders and communities towards shared decision-making amidst the different counterparties involved in the rebuild process. The 2010/2011 Christchurch earthquakes, with 7.1 Mw and 6.3 Mw magnitudes caused 185 fatalities and an unprecedented damage throughout the city and region. An estimated 91% of Greater Christchurch dwellings suffered some type of damage, in which approximately 7.5% of buildings collapsed or required demolition. The aftermath was particularly severe in suburban areas near the sea, rivers, and in the central city where approximately 90% of buildings required demolition. Consequently, there has been considerable pressure on housing and commercial property markets. Moreover, horizontal infrastructure was severely damaged, with water mains, sewer lines, and roads needing repairs that are estimated to cost approximately 1.5 billion NZD. Subsequently, Christchurch suffered an unparalleled population and activity movement throughout the city and Canterbury region, which prompted significant social and economic transformation. The need to obtain support for decision-making and integrate communities in the rebuild process, created the chance for new geospatial tools to be trialed in Christchurch.