Geothematic open data in Umbria region

Detailed information about geology, hydrogeology and seismic hazard issues for Umbria region are contained in a spatial database available as open data format (shape file or KMZ) and distributed under the regional open data portal called Open Data Umbria ( http://dati.umbria.it ) where 297 datasets have been produced by Umbria Region until now and most of them are made by Geological Survey. Development of standardized regional geologic database (BDG from now on) took about 20 years since 2010 to manage the huge set of information contained in the 276 geologic maps. As a result of migration to BDG, 231 distinct geologic units were found for Umbria Region territory represented by about 47,000 polygon features. The total land area of Umbria 8,475 km ² wide is divided in the BDG into 46,982 different geological areas. Analysis of the information contained in the BDG is preliminary to the creation of more geothematic layers and custom maps. The key word is the characteristic index of the single geologic unit. Characteristic index, shown in percentage, calculates the ratio between the surface of the geologic units compared to their thickness. Thickness value for each geologic unit is intended to be based on rank level and calculated as weighted average of the thickness for each geologic unit. Calculations in terms of land area percentage show many differences between portions of the territory capable of storing water and the characteristic index of the geologic units capable of storing water. The situation changes if instead we analyze aquifers within individual geological domains and their characteristic index of the single geologic unit whose charts show significant differences. Moreover, after accurate analysis by the Geological Survey, regional seismic hazard maps were derived from the BDG and available as open data format. Umbria has been divided in thirteen zones where local conditions, i.e. presence of artificial fills or particular surface topography, may affect the shaking levels and amplify the effects of the earthquake. The total land area of Umbria is 8,475 square kilometers, and it has been classified in 69,675 unique zones each one characterized by particular seismic hazard. Statistics also show (in percent) that 48 of Umbria land area is characterized by morphological and stratigraphic conditions affecting the shake while 52 is not subject to amplification. Population living in area with no amplification is 322,987 accounting for 36.5 % of the total while 561,281 accounting for 63.5 % of the total live in area where amplification of the shake is likely to happen. Currently four italian regions, Emilia-Romagna, Marche, Tuscany and Umbria, have planned to cooperate starting from their own BDG and develop, after data generalization and analysis, a shared GIS based geologic database of Northern Appennines, following the European Standard database structure and format.