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The Skin of Venice: Automatic Facade Extraction from Point Clouds

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Isabella Di Lenardo, Paul Robert Guhennec
2023

Abstract

We propose a method to extract orthogonal views of facades from photogrammetric models of cities. This method was applied to extract all facades of the city of Venice. The result images open up new areas of research in architectural history.

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https://infoscience.epfl.ch/entities/publication/d9372c08-306c-41bb-b1db-e6f3f1a4ea52

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Venice (ˈvɛnᵻs ; Venezia veˈnɛttsja; Venesia veˈnɛsja, outdatedly Venexia veˈnɛzja) is a city in northeastern Italy and the capital of the Veneto region. It is built on a group of 118 small islands that are separated by expanses of open water and by canals; portions of the city are linked by over 400 bridges. The islands are in the shallow Venetian Lagoon, an enclosed bay lying between the mouths of the Po and the Piave rivers (more exactly between the Brenta and the Sile).

In meteorology, a cloud is an aerosol consisting of a visible mass of miniature liquid droplets, frozen crystals, or other particles suspended in the atmosphere of a planetary body or similar space. Water or various other chemicals may compose the droplets and crystals. On Earth, clouds are formed as a result of saturation of the air when it is cooled to its dew point, or when it gains sufficient moisture (usually in the form of water vapor) from an adjacent source to raise the dew point to the ambient temperature.

A point cloud is a discrete set of data points in space. The points may represent a 3D shape or object. Each point position has its set of Cartesian coordinates (X, Y, Z). Point clouds are generally produced by 3D scanners or by photogrammetry software, which measure many points on the external surfaces of objects around them. As the output of 3D scanning processes, point clouds are used for many purposes, including to create 3D computer-aided design (CAD) models for manufactured parts, for metrology and quality inspection, and for a multitude of visualizing, animating, rendering, and mass customization applications.

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