Abstract
Abstract. Historical centers represent the outcome of transformations and stratifications of the cities across the centuries. The knowledge of a historical urban environment requires an analytical methodology articulated on several interconnected levels of investigation to model a multi-layered complexity that encompasses the geometric and stylistic features of places (blocks irregularities, narrow streets, stratified buildings), the accessibility (pedestrial zone, no flyzone), the use of existing data (GIS, cartographies). Today the challenge for historical centers is dual: on the one side to make use of expeditious technologies to acquire data, on the other one to create 3D city models that allow to manage, visualize, enquire and use these data in a unique digital ecosystem. Our research deals with a multi-sensor data acquisition, evaluation and integration with the aim of creating informed and responsive 3D city models (CIM) that constitute a synthesis of the survey conducted and become the support for simulations in various contexts (seismic risk, hydraulic, energy performance).
Highlights
Historical centers represent the memory of the choices that have drawn the history of a place; that is, the outcome of transformations and stratifications of the cities across the centuries
A first research question arises: is it possible to use fast mapping urban mapping techniques such as spherical photogrammetry or iMMS based on SLAM (Simultaneous Localization and Mapping) technologies? Is the level of accuracy and quality of the data sufficient for the requirements of urban surveying? Another critical issue is related to the data obtained: how to integrate multi-source and multi-scala data for the creation of a City Information Modeling? Our work focus on these research questions
This research was aimed to explore the potentialities of expeditious surveying techniques for the creation of informed and responsive 3D city models of historical centers
Summary
Historical centers represent the memory of the choices that have drawn the history of a place; that is, the outcome of transformations and stratifications of the cities across the centuries. The use of flying drones in these areas often is limited for the legal and privacy restrictions, and for the presence of obstacles such as antennas, wires, balconies, ect In this sense, a first research question arises: is it possible to use fast mapping urban mapping techniques such as spherical photogrammetry or iMMS (indoor Mobile Mapping Systems) based on SLAM (Simultaneous Localization and Mapping) technologies? As case study we chose an emblematic area of the city of Catania (Italy), the ex “extra moenia” district of Rinazzo (made up of narrow, twisting streets and one/two-floor buildings) which in 1881 was affected by the opening of a new road. The city blocks include different morphological characteristics (urban canyon ratios) and building typologies, that range from highlevel residential buildings (palatial houses) to spontaneous buildings (one- or two-storey cells), which are still characterised by socio-cultural degradation
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