Oblique Photogrammetry Supporting 3d Urban Reconstruction of Complex Scenarios

Abstract

ABSTRACT:Accurate 3D city models represent an important source of geospatial information to support various "smart city" applications, such as space management, energy assessment, 3D cartography, noise and pollution mapping as well as disaster management. Even though remarkable progress has been made in recent years, there are still many open issues, especially when it comes to the 3D modelling of complex urban scenarios like historical and densely-built city centres featuring narrow streets and non-conventional building shapes. Most approaches introduce strong building priors/constraints on symmetry and roof typology that penalize urban environments having high variations of roof shapes. Furthermore, although oblique photogrammetry is rapidly maturing, the use of slanted views for façade reconstruction is not completely included in the reconstruction pipeline of state-of-the-art software. This paper aims to investigate state-of-the-art methods for 3D building modelling in complex urban scenarios with the support of oblique airborne images. A reconstruction approach based on roof primitives fitting is tested. Oblique imagery is then exploited to support the manual editing of the generated building models. At the same time, mobile mapping data are collected at cm resolution and then integrated with the aerial ones. All approaches are tested on the historical city centre of Bergamo (Italy).

Accurate Reconstruction of the LoD3 Building Model by Integrating Multi-Source Point Clouds and Oblique Remote Sensing Imagery

“…However, they are simply integrated as textured meshes and lack semantic knowledge. Some researchers have tried to use sequential images to model the building as piecewise planar facades [19][20][21][22][23][24]. Unfortunately, the problems of shadow, occlusion and texture lacking exist in the image data, resulting in both geometric distortion in local area and low accuracy.…”

UAV photogrammetry for archaeological site survey. 3D models at the Hierapolis in Phrygia (Turkey)

“…High descriptive capabilities of terrestrial laser strategies must be weighed with their complexity in terms of times-costs for acquisition arranging and pointclouds management, registration and processing. New solutions of Mobile Mapping Systems (MMS) for rapid acquisition of point clouds are available and under experimentation in complex scenarios such as the urban and heritage contexts too (Toschi et al, 2017). On the other side, as stated, latest approaches in image densification algoritms and improvements of the sensors quality available on aerial devices equipped with high-resolution cameras allow the production of 3D dense clouds with significant gain in level of geometric definition, which can be rather compared and integrated with the terrestrial ones in terms of accuracy.…”

Close-Range Mini-Uavs Photogrammetry for Architecture Survey

“…For this latter reason it is useful to test instruments and methodologies, verifying from one side their metrological reliability, from the other producing intelligible results for non-technical people, creating a knowledge connection between different application fields (Stylianidis et al 2016). Nowadays, 3D survey workflow applied for the urban façades acquisition is not a novelty, nevertheless it presents several "bottlenecks" in critical environmental conditions (Toschi et al 2017), such as the historical city centres, which are strongly bound by each country set of rules (Stoker et al 2017), particularly pressing in the Italian country (ENAC, 2016). Very few survey experimentations have adopted ultra-light UAVs for surveying architecture case study (Russo et al 2018) but this field open very interesting scenarios in terms of testing methodology, giving the opportunity to widen close-range photogrammetry applications, introducing another important chance from the research point of view.…”