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Marco Amanti, APAT - Italian Geological Survey (Italy)
Loredana Battaglini, APAT - Italian Geological Survey (Italy)
Valentina Campo, APAT - Italian Geological Survey (Italy)
Carlo Cipolloni, APAT - Italian Geological Survey (Italy)
Maria Pia Congi, APAT - Italian Geological Survey (Italy)
Giovanni Conte, APAT - Italian Geological Survey (Italy)
Daniela Delogu, APAT - Italian Geological Survey (Italy)
Renato Ventura, APAT - Italian Geological Survey (Italy)
Claudio Zonetti, APAT - Italian Geological Survey (Italy)
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The "CARG project" carried out by the Italian Geological Survey together with Regional Geological Surveys has the aim to produce and print a national geological map, at 1:50.000 scale. A geological database, with data at 1:25.000 scale, will complete the project. At present 38 sheets have been printed and 257 have been financed out of 636 sheets that cover the whole territory.
Even if these partial data are available as soon as they are published, to see the end of the project and have a complete coverage of the national territory we should wait for a long time.
Anyway there is a need for geological data in vector form to cope with the growing request of homogeneous geological information at national level to be used as a tool in projects related to applied geology such as hazard evaluation or environmental impact assessment.
This is the reason why the Italian Geological Survey carried out a project to digitize the existing Geological Map of Italy at 1:100.000 scale, whose 277 sheets cover the entire Italian territory. To have an homogeneous and continuous lithological representation all over the country a unique legend was needed, so many tests were performed on several sample areas to take into account the different geological environments and conditions that characterize Italy.
The legend setting that Authors show in this paper has its basis both in a bibliographic analysis of lithological maps, including international examples, and in the peculiar characteristics of the original data (the legend of the already existing Geological Map of Italy at 1:100.000 scale and related descriptive notes). To be sure not to lose anything of the original data, a new database, linked with the ancestral databank, was realized to contain new lithological legend data and, moreover, integrative data concerning the genetic environment, rock mass characteristics, depositional environment, rock mass texture, if such information was available in the original legend and/or the descriptive note.
The product presented in this paper represents just a first step to derive thematic maps to be used in different types of geographic analyses at national scale. Some examples of thematic information layers derived from the proposed legend could be: a hydrological attribute (to obtain an Hydrogeological complexes map) a geophysical attribute (for seismic waves velocity map), a geomorphologic and morphodynamic attribute (to obtain geohazard maps), ecc.
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