Detection and Evaluation of Topological Consistency in Citygml Datasets

Giovanella, A.; Bradley, Patrick Erik; Wursthorn, Sven

doi:10.5194/isprs-annals-iv-4-59-2018

Cited by 3 publications

(4 citation statements)

References 21 publications

(21 reference statements)

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“…In particular, they are topologically consistent. The values may differ from previous results given in [1] because this time all CityGML objects were imported into the databases instead of just importing the buildings. Figure 5 shows the percentages of polygon intersection types when the intersection is non-empty and the two polygons are distinct.…”

Section: Resultsmentioning

confidence: 75%

“…In [1], the intersection matrix diag(1, 1, 0) is erroneously said to always come from a topologically consistent configuration of 3D polygon pairs. Theorem 4.…”

mentioning

confidence: 99%

“…If In [29], example realisations for some of the 60 valid intersection matrices will be shown. In [1], it has been erroneously stated without proof that there are 49 possible intersection matrices for planar polygons in R 3 .…”

mentioning

confidence: 99%

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Evaluation of Topological Consistency in CityGML

Giovanella

Bradley

Wursthorn

2019

IJGI

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Boundary representation models are data models that represent the topology of a building or city model. This leads to an issue in combination with geometry, as the geometric model necessarily has an underlying topology. In order to allow topological queries to rely on the incidence graph only, a new notion of topological consistency is introduced that captures possible topological differences between the incidence graph and the topology coming from geometry. Intersection matrices then describe possible types of topological consistency and inconsistency. As an application, it is examined which matrices can occur as intersection matrices, and how matrices from topologically consistent data look. The analysis of CityGML data sets stored in a spatial database system then shows that many real-world data sets contain many topologically inconsistent pairs of polygons. It was observed that even if data satisfy the val3dity test, they can still be topologically inconsistent. On the other hand, it is shown that the ISO 19107 standard is equivalent to our notion of topological consistency. In the case when the intersection is a point, topological inconsistency occurs because a vertex lies on a line segment. However, the most frequent topological inconsistencies seem to arise when the intersection of two polygons is a line segment. Consequently, topological queries in present CityGML data cannot rely on the incidence graph only, but must always make costly geometric computations if correct results are to be expected.

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Section: Resultsmentioning

confidence: 75%

“…In [1], the intersection matrix diag(1, 1, 0) is erroneously said to always come from a topologically consistent configuration of 3D polygon pairs. Theorem 4.…”

mentioning

confidence: 99%

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Evaluation of Topological Consistency in CityGML

Giovanella

Bradley

Wursthorn

2019

IJGI

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“…CityGML data was imported after setting up all the necessary connections between PostgreSQL and 3DCityDatabase. The SFCGAL extension, which augments the 3D spatial analysis for operations such as extrusion or volume calculation (Giovanella et al, 2018;Ryoo et al, 2017), was also added to the database.…”

Section: Hbim To Postgresql/postgismentioning

confidence: 99%

A Review of 3d Gis for Use in Creating Virtual Historic Dublin

Chenaux¹,

Murphy

Pavía

et al. 2019

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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carleton.ca, Stephen Fai cims@bell.net 4 Office of Public Works, John.Cahill@OPW.ie, shane.lenihan@opw.ie 5 Discovery Programme, anthony@discoveryprogramme.ie Commission II ABSTRACT: This paper illustrates how BIM integration with GIS is approached as part of the workflow in creating Virtual Historic Dublin. A design for a WEB based interactive 3D model of historic buildings and centres in Dublin City (Virtual Historic Dublin City) paralleling smart city initiates is now under construction and led by the National Monuments at the Office of Public Works in Ireland.The aim is to facilitate the conservation and maintenance of historic infrastructure and fabric and the dissemination of knowledge for education and cultural tourism using an extensive Historic Building Information Model. Remote sensing data is now processed with greater ease to create 3D intelligent models in Historic BIM. While the use of remote sensing, HBIM and game engine platforms are the main applications used at present, 3D GIS has potential to form part of the workflow for developing the Virtual Historic City. 2D GIS is now being replaced by 3D spatial data allowing more complex analysis to be carried out, 3D GIS can define and depict buildings, urban rural centres in relation to their geometry topological, semantic and visualisation properties. The addition of semantic attributes allows complex analysis and 3D spatial queries for modelling city and urban elements. This analysis includes fabric and structural elements of buildings, relief, vegetation, transportation, water bodies, city furniture and land use.

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Topological Access Methods for Spatial and Spatiotemporal Data

Jahn

Bradley

2022

IJGI

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In order to perform topological queries on geographic data, it is necessary to first develop a topological access method (TOAM). Using the fact that any (incidence or other binary) relation produces a topology which includes the common usage of topology for spatial or spatiotemporal data, here, such a TOAM is developed on the basis of the previously applied concept of Property Graph used in order to manage topological information in data of any dimension, whether time dependent or not. As a matter of fact, it is necessary to have a TOAM in order to query such a graph, and also to have data which are topologically consistent in a certain sense. While the rendering of topological consistency was the concern of previous work, here, the aim is to develop a methodology which builds on this concept. In the end, an experimental test of this approach on a small city model is performed. It turned out that the Euler characteristic, a well-known topological invariant, can be helpful for the initial data validation. Practically, this present theoretical work is seen to be necessary in view of future innovative applications, e.g., in the context of city model simulations, including distributed geo-processing.

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Detection and Evaluation of Topological Consistency in Citygml Datasets

Cited by 3 publications

References 21 publications

Evaluation of Topological Consistency in CityGML

Evaluation of Topological Consistency in CityGML

A Review of 3d Gis for Use in Creating Virtual Historic Dublin

Topological Access Methods for Spatial and Spatiotemporal Data

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