BUILDING AND SHARING ON THE WEB 3DGIS CITY MODEL RELATED TO HISTORICAL CARTOGRAPHIC VIEWS

C. Monti¹, R. Brumana¹, F. Prandi¹, S. Musumeci²

1 - Polytechnic of Milan, DIIAR

2 - Agenzia del Territorio

raffaella.brumana@polimi.it

Recent researches on georeferencing methodologies to support localization and valorization of cultural heritage, carried out on historical sites and basins, point the attention in their conservation, transformation and maintenance with growing attention to territorial scale of the historical-documentary-environmental stratified values.

The GIS, as collection of space-temporal data, is a ‘thopos’ to relate historical and current cartographies to the future intervention actions, and it can contribute to plan transformation, in according to logical of sustainable development, of active participated protection: but it need to be shared outside, through the web, to citizens, professionals and Public Administration subjects for the On-Line publication.

The work was articulated in various phases: from the case studio of historical centres census to the 2DWEB-GIS thematic data structuring, from georeferenced historic cartographic cadastral maps, to the re-building panoramic views starting from perspective ancient maps, until to implementing 3DGIS city model.

The rapid growth of GIS technologies and of 3D visualizer have increased the need of a definition for the structure of 3D geographic data. This structure provides to 3Dgeodata final users a coherent and congruent data with the physic realty they want to represent. In this phase of the work, following the ISO19100 data specifications, it has been produced a semi-Automatic 3D GIS City model by AutoLisp script from the digital mapping data. The features built by this procedures allows to represents the artificial Manu facts such as: bridges, staircases, containment walls, raised up railways.

The case studio of the research is the environmental-urban basin of the ancient waterway network of the “Navigli” in Milan. During the centuries they has been in part covered by roads in part preserved. A program of urban requalification need a new methodological cartographic approach in order to support transformation analysis, landscape-urban-engineering and architectural projects.

For this aim terrestrial Laser Scanner Data has been integrated to the base 3D city model built on the technical map at the scale 1:1000 (2004) in order to develop the 3D orthophotos map views from the lower observation point at the “Naviglio” level.

The result would be a water front map able to be shared on the Web through portals and environment such as Google earth etc. to be locally implemented in the most common software used by professionals (.skp, .3dS…).