The DOI matches its Crossref record; 40 of the 40 references it cites were found in a registry or an index; 1 of the 13 sources its claims cite were checked for support.
POI VizNet: New QGIS Tool to construct Visibility Networks in Cities
Open accessAbstract
Abstract. Network science and graph theory offer attractive models to describe urban phenomena and examine cases of urban planning and design. However, none of the existing network analysis tools consider simultaneously human visual perception and locations of urban activities. In this paper we introduce POI VizNet, a new QGIS plug-in that constructs various 2-dimentianal undirected graphs of unobstructed lines of sight. The plug-in integrates an increasing amount of available GIS-based data of Point Of Interest (POI) and visibility into one readily accessible analytical framework. Graphs are created between two types of decision points during urban travel – street intersections and POIs, origins, and destinations of travel, by connecting these potential observer’s decision locations in an open space between buildings. In addition, POI VizNet provides advanced options to build graphs using a predefined viewing distance and perceptual perspective. Visibility graphs are constructed and visualised as new layers in QGIS and delivered as network files suitable for further exploration, analysis, and visualisation in various network software packages.
Overview
AI snapshot
Written from the paper’s full text.
TL;DR
POI VizNet is a new open-source QGIS plug-in that constructs 2D undirected visibility graphs from street intersections and POI locations, using building footprints as view constraints. It integrates POI, visibility, and network analysis in one platform and outputs graph files for centrality analysis in QGIS or external network software.
Key findings
- Introduces three graph types: Street Network Visibility Graph (SNVG) between street intersections, Integrative Visibility Graph (IVG) between intersections and POIs, and Point of Interest Visibility Graph (POIVG) between POIs, with links representing unobstructed lines of sight.
- Provides advanced viewing options: restricted vision with a user-defined distance (e.g., the “400-meter rule” from Mehaffy et al. 2010) and weighted vision with link weights calculated as \(1/d^2\), where \(d\) is metric distance between nodes.
- Preprocessing includes projection to EPSG:3857, quadtree-based intersection identification, a default 20 m intersection aggregation threshold, POI centroid conversion, and projection of inner POIs outside building facades using 5 m street subsegments and a 1 m buffer.
- Outputs sight-line and node layers plus a GDF graph; centrality measures include degree, closeness, and betweenness via NetworkX, demonstrated with OpenStreetMap data in Bloomsbury, West End of London.
Methods
- Design: Python-based QGIS plug-in using three input layers—street centrelines, building footprint constraints, and POI—to construct 2D undirected visibility graphs; building footprints constrain sight lines.
- Data/sample: demonstration using OpenStreetMap data for an area in Bloomsbury, a district in the West End of London, UK, with SNVG, IVG, and POIVG examples visualized in Gephi.
- Analysis: visibility lines are built between nodes, optionally limited by viewing distance or weighted by distance; the plug-in outputs GDF graph files and layers, and can compute centrality measures internally or in external network software.
Limitations
- Stated: the current version treats environments as 2D and visibility as mutual, so graphs are undirected; future work plans 3D, directional viewing, and more physical/perceptual properties.
- Stated: limited computational power restricts analysis to size-limited areas in a small neighbourhood; data quality/availability can cause intersection and POI identification errors, POI projection outside buildings is imperfect and may require manual edits, and the default 20 m aggregation threshold is not optimal for all urban cases.
- Evident: the Bloomsbury implementation is illustrative and the text does not report quantitative validation or accuracy metrics for the constructed graphs.
Model-written summary. Check it against the paper before relying on it.
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Claims the paper makes
1 of 13 cited sources checked · 1 supported · 0 flagged
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“In this paper we introduce POI VizNet, a new QGIS plug-in that constructs various 2-dimentianal undirected graphs of unobstructed lines of sight.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > Abstract
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesThe paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“In addition, POI VizNet provides advanced options to build graphs using a predefined viewing distance and perceptual perspective.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > Abstract
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesThe paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Graphs are created between two types of decision points during urban travel -street intersections and POIs, origins, and destinations of travel, by connecting these potential observer's decision locations in an open space between buildings.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > Abstract
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes- The authors state this as an assumption: Building footprint polygons serve as geometric constraints for views.
- The authors state this as an assumption: Open space between buildings is available for views experienced in any transport mode—pedestrian, vehicle, or cycling.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Unlike formerly developed urban network tools that operate with street network alone, POI VizNet includes additional urban element -POIlocations of predefined points of interest.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 1.4 POI VizNet
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesThe paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“The plug-in integrates an increasing amount of available GIS-based data of Point Of Interest (POI) and visibility into one readily accessible analytical framework.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > Abstract
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In contrast to other vision-oriented analysis methods, such as local isovists or view shields (Kim et al., 2019;Benedikt, 1979), POI VizNet translates a city into network-based structure.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 3.1 Significance of Networks
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesThe paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“But these approaches have remained simplified, as none of the existing tools consider human visual perception, while vision and visibility are one of the major features influencing spatial cognition and behaviour”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 1.3 Growing GIS-based POI Data
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes? Based: unclearNone of the sources cited for this claim have been checked yet.
In the paper
“Visibility is an important determinant of urban vitality; visuospatial characteristics play a central role in navigation performance (Wang et al., 2014).”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 1.2 Encoding Spatial Information using Vision
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIn the paper
“Especially, such tasks as wayfinding, search and exploration in an unfamiliar urban environment are based on the human sense of sight as a generative feature for shaping spatial memory and behaviour (Wiener et al., 2009).”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 1.2 Encoding Spatial Information using Vision
What the sources say
- Not checked — no full text of the sourcecites Wiener et al., 2009 source
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIn the paper
“Visibility is an important determinant of urban vitality; visuospatial characteristics play a central role in navigation performance (Wang et al., 2014).”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 1.2 Encoding Spatial Information using Vision
What the sources say
- Not checked — no full text of the sourcecites Wang et al., 2014 source
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
- Probably not a substantial claim. 34
- It may state two separate claims as one. 14
Every source the paper cites for this claim was checked and supports it.
In the paper
“POI VizNet centrality measures are based on NetworkXfoot_4 , a Python package for the creation, manipulation, and study of the structure, dynamics, and functions of complex networks (Hagberg et al., 2008).”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 2.6 Centrality Measures and Data Output
What the sources say
- Supportedcites Hagberg et al., 2008 source
The Abstract identifies NetworkX as a Python package for exploring and analyzing networks and lists algorithms including betweenness centrality. The Introduction describes its use to study network structure and dynamics. The statement that POI VizNet uses it is the citing authors’ own description, not a claim attributed to this source. (LLM, conf=0.93)
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
- Supported
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“For IVG and POIVG, all three layers are necessary, and for SNVG, no POI layer is required.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 2.3 Pre-processing of the Input Data
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“The tool is developed in Python as open plug-in for the QGISfoot_1 platform, compliant with open standards and free to use for any purpose.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 1.4 POI VizNet
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Resulted GDF is suitable for centrality exploration in any network software package, or these measures can be calculated within the plug-in (Figure 4d).”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 2.6 Centrality Measures and Data Output
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Toolbox's units of analysis thus become both urban tissue and POI, allowing to create different visibility graphs and to compute network measures separately for each urban element.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 1.4 POI VizNet
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“The POI VizNet plug-in is available for installation and update via the 'Plugins Manager' tool of QGIS, making it easily accessible and maintainable to any QGIS user.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 1.4 POI VizNet
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Point of Interest Visibility Graph (POIVG) -creates visual connections between POI that are visible from each other in a given building arrangement (Figure 3c).”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 2.1 How We represent Visuospatial Properties of Urban Environment?
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“POI VizNet is based on visual access, a basic cognitive property of humans, as a key factor for the analysis.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 1.4 POI VizNet
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✗ Based: failsProbably not a substantial claim. The paper may give no reason why it holds.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“20-meter threshold fits best OpenStreetMap (OSM), the potential opensource data for the plug-in.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 2.3.3 Intersection Aggregation:
Strength:plain· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✗ Based: failsProbably not a substantial claim. The paper’s conclusions may not depend on it. The paper may give no reason why it holds.
None of the sources cited for this claim have been checked yet.
In the paper
“These include degree centrality, 5 https://qgis.org/api/qgsalgorithmextractbylocation_8h_source.html closeness centrality, and betweenness centrality (Wasserman and Faust, 1994;Freeman, 1979.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 2.6 Centrality Measures and Data Output
What the sources say
- Not checked — no full text of the sourcecites Wasserman and Faust, 1994 source
- Not matchedcites Freeman, 1979
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“This option allows to incorporate metric distance in one framework with topological properties of visibility.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 2.5 Advanced Distance Options
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
- Rests on an assumption: POI VizNet is typically applied to dense urban conditions, where the focus is on the line of sight as the most influential feature.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“POI VizNet deals with any geometry of POIpoint of interest that are inputted as a point, a polyline, or a polygon.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 2.3.4 POI Transformations:
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Visibility graphs are constructed and visualised as new layers in QGIS and delivered as network files suitable for further exploration, analysis, and visualisation in various network software packages.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > Abstract
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“This option accounts for the effect of the distance on human perception.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 2.5 Advanced Distance Options
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✗ Based: failsProbably not a substantial claim. The paper’s conclusions may not depend on it. The paper may give no reason why it holds.
- Rests on an assumption: Entities viewed at various distances have different perceptual impacts; closer entities might look more important.
- Rests on an assumption: POI VizNet is typically applied to dense urban conditions, where the focus is on the line of sight as the most influential feature.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Street Network Visibility Graph (SNVG)creates visual connections between decision points of the street network, i.e., street intersections (Figure 3b)”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 2.1 How We represent Visuospatial Properties of Urban Environment?
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“This visualisation demonstrates how POI from the same street are grouped around a certain intersection.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 2.7 Implementation Examples
Strength:boosted· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“But these approaches have remained simplified, as none of the existing tools consider human visual perception, while vision and visibility are one of the major features influencing spatial cognition and behaviour”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 1.3 Growing GIS-based POI Data
Tests✓ Asserted: passes✗ Checkable: fails✓ Load-bearing: passes✗ Based: failsProbably not a substantial claim. It may be too vague to check against evidence. The paper may give no reason why it holds.
In the paper
“This value is proposed in Mehaffy et al. (2010) as the maximum spacing of main thoroughfares that empirical observations show in traditional pedestrian governed urban fabric.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 2.5 Advanced Distance Options
What the sources say
- Not checked — no full text of the sourcecites Mehaffy et al. (2010) source
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Network characteristics are global, and therefore they offer a more nuanced picture of urban realm, unique for each building or each POI.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 3.1 Significance of Networks
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✗ Based: failsProbably not a substantial claim. The paper may give no reason why it holds. It may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Unlike the simple notation of distance or location, visibility graphs (VG) account for cognitive complexity involved in urban life.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 1.2 Encoding Spatial Information using Vision
Tests✓ Asserted: passes✗ Checkable: fails✓ Load-bearing: passes✗ Based: failsProbably not a substantial claim. It may be too vague to check against evidence. The paper may give no reason why it holds.
In the paper
“However, the ability to evaluate the attractiveness of opportunities is a key concept in urban studies (Yue et al., 2017).”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 1.3 Growing GIS-based POI Data
What the sources say
- Not matchedcites Yue et al., 2017
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
Strength:plain· not yet calibratedTests✓ Asserted: passes✗ Checkable: fails✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. It may be too vague to check against evidence. The paper’s conclusions may not depend on it.
- Not matched
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Analysing visual patterns with methods from complex network science, we suggest a new link between urban social processes, spatial cognition, and physical theories.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 3.1 Significance of Networks
Tests✓ Asserted: passes✗ Checkable: fails✓ Load-bearing: passes✗ Based: failsProbably not a substantial claim. It may be too vague to check against evidence. The paper may give no reason why it holds.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Most of the existing urban graph methods consider only street networks and ignore other aspects of the built environment.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 1.3 Growing GIS-based POI Data
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✗ Based: failsProbably not a substantial claim. The paper may give no reason why it holds.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“However, none of the existing network analysis tools consider simultaneously human visual perception and locations of urban activities.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > Abstract
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✗ Based: failsProbably not a substantial claim. The paper may give no reason why it holds.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“However, analysing street network connectivity alone without considering additional information does not present the whole picture of the urban realm.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 1.3 Growing GIS-based POI Data
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✗ Checkable: fails✓ Load-bearing: passes✗ Based: failsProbably not a substantial claim. It may be too vague to check against evidence. The paper may give no reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Therefore, the created graph illustrates hypothetical visual trajectories of a person looking for a particular POI in the city.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 2.1 How We represent Visuospatial Properties of Urban Environment?
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
- The authors state this as an assumption: Building footprint polygons serve as geometric constraints for views.
- The authors state this as an assumption: Open space between buildings is available for views experienced in any transport mode—pedestrian, vehicle, or cycling.
None of the sources cited for this claim have been checked yet.
In the paper
“Research has demonstrated that OSM data are geometrically accurate and up-to-date, particularly in urban areas (Barrington-Leigh and Millard-Ball, 2017;Zhou, 2017).”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 2.7 Implementation Examples
What the sources say
- Not matchedcites Barrington-Leigh and Millard-Ball, 2017
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Not checked — no full text of the sourcecites Zhou, 2017 source
Load-bearingStrength:boosted· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
- Not matched
None of the sources cited for this claim have been checked yet.
In the paper
“A wide range of measures, developed in network and graph theories, could assist in understanding urban evolution -networks' structure, their density, resilience, connectedness, hierarchy, modularity, or clustering works' structure, their density, resilience, connectedness, hierarchy, modularity or clustering (Arcaute et al.,2015;Barthelemy,2015;Newman,2010), though not discussed here in details.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 3.1 Significance of Networks
What the sources say
Strength:hedged· not yet calibratedCausal:conditional· not yet calibratedTests✓ Asserted: passes✗ Checkable: fails✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. It may be too vague to check against evidence. The paper’s conclusions may not depend on it.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“allows to explore urban environment using interactive visual exploration, as well as to deepen into further statistical analysis, inquiry of individual measures and locations, identification of network core, hotspots or clustering.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 3.3 Contribution -POI VizNet Potential Users and Applications
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✗ Based: failsProbably not a substantial claim. The paper may give no reason why it holds. It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The use of the new toolbox can prevent withdrawal of pedestrian-oriented commercial uses to the secondary streets, as well as prevent excessive automobilization of city's main streets happening in many planned, modern cities worldwide.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 3.3 Contribution -POI VizNet Potential Users and Applications
Tests✓ Asserted: passes✗ Checkable: fails✓ Load-bearing: passes✗ Based: failsProbably not a substantial claim. It may be too vague to check against evidence. The paper may give no reason why it holds. It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“POI VizNet combines three historically disconnected approaches -graph analysis, land-use analysis, and visibility analysis, and thereby opens up new empirical ground for these fields.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 3.3 Contribution -POI VizNet Potential Users and Applications
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✗ Based: failsProbably not a substantial claim. The paper may give no reason why it holds. It may state two separate claims as one.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“However, 20 meters is not an optimal choice for all existing urban cases.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 3.2 Limitations and Further Development
Strength:plain· not yet calibratedTests✓ Asserted: passes✗ Checkable: fails✗ Load-bearing: fails✗ Based: failsProbably not a substantial claim. It may be too vague to check against evidence. The paper’s conclusions may not depend on it. The paper may give no reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“It expands QGIS with new behaviour-oriented exploratory functionality”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 3.3 Contribution -POI VizNet Potential Users and Applications
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✗ Based: failsProbably not a substantial claim. The paper may give no reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Calculation and visualisation of the shortest path can help us to understand a sequence of views in the studied built environment.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 2.7 Implementation Examples
Strength:plain· not yet calibratedCausal:conditional· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✗ Based: failsProbably not a substantial claim. The paper’s conclusions may not depend on it. The paper may give no reason why it holds.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“Potential issues with identification of the intersections and POI locations might occur due to insufficient or defective data sources or mismatch between different formats.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 3.2 Limitations and Further Development
Strength:hedged· not yet calibratedCausal:conditional· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“The current release only covers a fraction of possibilities and has inherent limitations arising from the representation method and computational power.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 3.2 Limitations and Further Development
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIt may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Therefore, POI VizNet promotes neighbourhood vibrancy and creates sustainable urban context with mix use desirable for pedestrians.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 3.3 Contribution -POI VizNet Potential Users and Applications
Tests✓ Asserted: passes✗ Checkable: fails✓ Load-bearing: passes✗ Based: failsProbably not a substantial claim. It may be too vague to check against evidence. The paper may give no reason why it holds. It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“It integrates POI, visual perception, and network analytics in one single platform.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 3.3 Contribution -POI VizNet Potential Users and Applications
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✗ Based: failsProbably not a substantial claim. The paper may give no reason why it holds.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“Apparently, this operation is not perfect and could produce the result that differs from the real location of the amenity.”
§ POI VizNet: New QGIS Tool to construct Visibility Networks in Cities > 3.2 Limitations and Further Development
Strength:hedged· not yet calibratedCausal:conditional· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
The paper relies on this without support.
About 90% of information transmitted to the human brain is visual.
“about 90% of information transmitted to the human brain is visual.”
The paper relies on this without support.
Entities viewed at various distances have different perceptual impacts; closer entities might look more important.
“Entities viewed at various distances will have different perceptual impacts: for instance, closer entities might look more important.”
The authors state this as an assumption.
Each POI is most likely to be located outside the building in front of the façade that lies closest to the street.
“We assume that each POI is most likely to be located outside the building in front of the façade that lies closest to the street (Figure 10c).”
The authors state this as an assumption.
Building footprint polygons serve as geometric constraints for views.
“Building footprint polygons serve as geometric constraints -we consider open space as space available for views experienced in any transport mode -pedestrian, vehicle, or cycling.”
The authors state this as an assumption.
Open space between buildings is available for views experienced in any transport mode—pedestrian, vehicle, or cycling.
“Building footprint polygons serve as geometric constraints -we consider open space as space available for views experienced in any transport mode -pedestrian, vehicle, or cycling.”
The paper relies on this without support.
POI VizNet is typically applied to dense urban conditions, where the focus is on the line of sight as the most influential feature.
“However, POI VizNet is typically applied to dense urban conditions, where the focus is on the line of sight, as the most influential feature.”
The authors state this as an assumption.
The environment can be treated as two-dimensional and visibility as mutual, resulting in undirected graphs.
“First, for the sake of simplification, we treat any environment as two dimensional, and refer to visibility as mutual, i.e., the resulted graphs are undirected.”
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
POI projection refers to a nonexistent stage 6
MinorThe procedure numbers only five stages, and the polyline-based layer is created in stage 3, not stage 6. Stage 5 therefore points to a stage that does not exist in the listed procedure.
“5. Final projection of the node is created at the crossing of the buffer from stage 4 to the line layer created in stage 6.”
“3. Creation of a new polyline-based layer that connects all the POIs inside buildings with the closest street segment created in stage 2.”
Citations
Cites
The publisher hasn’t deposited this paper’s reference list.
Research works printed but not linked: 13
- Ben-Joseph, E.2005. The Code of the City: Standards and the Hidden Language of Place Making, Boston, MA, MIT Press.
- Brandes, U. 1994. A Faster Algorithm for Betweenness Centrality, Journal of Mathematical Sociology, 25: 163-177.
- Calthorpe, P., Fulton, W. 2001. The Regional City: Planning for the End of Sprawl. Washington, DC, Island Press.
- Hoboken, NJ, John Wiley and Sons.
- Figueiredo, L. 2005. Mindwalk: a Java based software for spatial analysis, Proceedings of the Fifth Space Syntax International Symposium, Delft, Delft University of Technology.
- Gross, J., Yellen, J.1999. Graph Theory and Its Application. London, CRC Press.
- Hillier, B., 2003b. The Architectures of seeing and going: Or, are Cities Shaped by Bodies or Minds? And is there a Syntax of Spatial Cognition?, Proceedings Space Syntax. 4th International Symposium, Hanson J (ed.), University College London, London. 2003, 06, p. 1-34.
- Hillier, B. 1996. Space is the machine: a configurational theory of architecture. Cambridge, UK: Cambridge University Press.
- Jacomy, M., Bastian, M., Heymann, S. 2009. Gephi: an open source software for exploring and manipulating networks. Proceedings of the Third International AAAI Conference on Weblogs and Social Media (ICWSM'09), in American Journal of Sociology 2009:361-362).
- Kim, M. 2009. Angular VGA and Cellular VGA An exploratory study for spatial analysis methodology based on human movement behaviour. 7 Th International Space Syntax Symposium, 1-14.
- Osborn, F., Mumford, L., Whittick, A., 1963. The New Towns: The Answer to Megalopolis, New York, McGraw-Hill.
- Ståhle, A., Marcus, L., Karlström, A. 2005. Place Syntax: Geographic accessibility with axial lines in GIS. In Proceedings, Fifth international space syntax symposium (pp. 131-144). Delft.
- Turner, A., 2007. UCL Depthmap 7: From Isovist Analysis to Generic Spatial Network Analysis, In: Turner, A. (Ed.), New Developments in Space Syntax Software. Presented at the 6th International Space Syntax Symposium, Istanbul Technical University, Istanbul, p.43-51.
Cited by
Sorted by citations
Chen, T., Natapov, A., & Larimian, T. (2026) · Geography and sustainability · doi:10.1016/j.geosus.2026.100528 · Cited by 1
Self-citation
Metadata
- Authors
- Natapov, A., Dalyot, S., & Cohen, A.
- Affiliations
- Loughborough University (GB)
- Technion – Israel Institute of Technology (IL)
- Ariel University (IL)
- Venue
- ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
- Publisher
- Copernicus GmbH
- Published
- 2024-10-18
- Volume
- X-4-2024
- Pages
- 239-246
- ISSN
- 2194-9042 (ISSN-L)
- 2194-9050
- OpenAlex
- W4403531761
- Cited by
- 1
- References
- 0
- Citations by year
- 2026: 1
- FWCI
- 0.19
- Type
- journal article
- Language
- en
- Open access
- diamond
- doi.org
- Licence
- Locations
- ISPRS annals of the photogrammetry, remote sensing and spatial information sciences (publishedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Topics
- Social Sciences › Urban Studies › Urban Design and Spatial Analysis
- Social Sciences › Geography, Planning and Development › Geographic Information Systems Studies
- Physical Sciences › Engineering › Building and Construction › 3D Modeling in Geospatial Applications
- Keywords
- point of interest, visibility graph, visual perception, urban travel, street intersections, open space between buildings, urban planning, network analysis
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
A language model drew the claims from the paper on 2026-10-21, under version 3 of the claim definition (model deepseek-v4.1-flash, prompt extract-v3).
A second model labelled each claim on 2026-10-21 (model jev-1.13-20260917, definition revision gold-guideline-v0.2).
Cited sources are checked with a language model’s help (gpt-6-sol).
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
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