MAPPING OF URBAN MATERIAL DEGRADATION FROM AVAILABLE DATA

An assessment study of air quality and metallic material degradation w as carried out in the Sarpsborg/Fredrikstad region in 1982-83. Based o n air quality modelling, the developed dose-response function for stee l was also modelled and mapped for the region (Haagenrud et al., 1985) . This type of modelling can now be improved. In the UN ECE Internatio nal Cooperating Programme for Materials dose-response functions for a range of materials and mapping procedures based on the'' critical/acce ptable load'' concept have been developed. By using these functions an d procedures together with the available air quality data and dispersi on models the corrosion is modelled and mapped for Oslo for 1985 and 1 993. The corrosion modelling in the ArcView geographical information s ystem is presented in the ENSIS integrated environmental surveillance and information system as a new ENSIS CORROSION module. Integrated in the ENSIS CORROSION module is also information from the recently compl eted digitalized building register GAB, containing all buildings in No rway. Application of such mapping for cost benefit assessments and mai ntenance planning is discussed.