The Experts below are selected from a list of 50010 Experts worldwide ranked by ideXlab platform
Jiang Bingchuan - One of the best experts on this subject based on the ideXlab platform.
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design of 3d military symbols based on the 3d map symbol Visual Variable theory
Science of Surveying and Mapping, 2009Co-Authors: Jiang BingchuanAbstract:A classification method of the 3D model symbols was introduced in this paper.Then the 3D map symbol Visual Variable theory was applied to design the 3D symbols.Finally,the rationality of the 3D symbol Variable design was analyzed from practical application.
Jean-daniel Fekete - One of the best experts on this subject based on the ideXlab platform.
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Evaluating Sketchiness as a Visual Variable for the Depiction of Qualitative Uncertainty
IEEE Transactions on Visualization and Computer Graphics, 2012Co-Authors: Nadia Boukhelifa, Anastasia Bezerianos, Tobias Isenberg, Jean-daniel FeketeAbstract:We report on results of a series of user studies on the perception of four Visual Variables that are commonly used in the literature to depict uncertainty. To the best of our knowledge, we provide the first formal evaluation of the use of these Variables to facilitate an easier reading of uncertainty in Visualizations that rely on line graphical primitives. In addition to blur, dashing and grayscale, we investigate the use of 'sketchiness' as a Visual Variable because it conveys Visual impreciseness that may be associated with data quality. Inspired by work in non-photorealistic rendering and by the features of hand-drawn lines, we generate line trajectories that resemble hand-drawn strokes of various levels of proficiency--ranging from child to adult strokes--where the amount of perturbations in the line corresponds to the level of uncertainty in the data. Our results show that sketchiness is a viable alternative for the Visualization of uncertainty in lines and is as intuitive as blur; although people subjectively prefer dashing style over blur, grayscale and sketchiness. We discuss advantages and limitations of each technique and conclude with design considerations on how to deploy these Visual Variables to effectively depict various levels of uncertainty for line marks.
Frederic Hubert - One of the best experts on this subject based on the ideXlab platform.
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how users perceive transparency in the 3d Visualization of cadastre testing its usability in an online questionnaire
Geoinformatica, 2017Co-Authors: Chen Wang, Jacynthe Pouliot, Frederic HubertAbstract:Using transparency as a Visual Variable in 3D geo-Visualization offers several advantages since it can encode underlying data and at the same time relieve the occlusion. However, the usability of transparency has yet to be tested with intended users and it might vary from one application domain to another or from one task to another. This research project addresses the usability of transparency in 3D cadastre Visualization, more specifically whether it helps users delimit property units (administrative boundaries) with their physical counterparts (e.g., walls) in condominium situation. In this situation, three types of boundaries (simple physical, simple administrative, and linked boundary, which is both physical and administrative) are involved in Visualization, and three different transparency levels are used to represent these types. Empirical tests are administered in the form of an online questionnaire for university students in law (notarial law) and land surveying. The results show that, in general, using three different transparency levels is preferable and efficient solution to help users demarcate property units with their physical counterparts, and 63% participants correctly achieved their Visual tasks with this design. Also, the transparency settings influence user's performance. For example, applying very high transparency to simple administrative boundaries as compared to simple physical boundaries improves user certainty. Another important discovery is that many university students in notarial law are inexperienced with 3D Visualization, and such inexperience affects the viewer's certitude when carrying out Visual tasks.
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experiments with notaries about the semiology of 3d cadastral models
ISPRS - International Archives of the Photogrammetry Remote Sensing and Spatial Information Sciences, 2013Co-Authors: Jacynthe Pouliot, Chen Wang, Frederic Hubert, Vivien Fuchs, M BedardAbstract:Based on the hypothesis that 3D cadastral models are helpful for notaries, this study investigates the performance of Visual Variables for the Visualization of 3D models. The approach undertaken uses face-to-face interviews with notaries involved in co-ownership establishment. A 3D geometric model of a complex condominium building is used as the studied case to which a selection of Visual Variables is applied. Thirty Visual solutions are tested against six notarial Visualization tasks and notaries are asked several questions. Based on the preliminary responses, we can now say that colour is the Visual Variable most appreciated by notaries, regardless of the Visualization task. The use of transparency is helpful in many cases, more specifically when reading annotation (official measures). However, confusion arises when too extensive geometry of 3D lots is viewed simultaneously, and unnecessary when the geometry of the lots is fully visible. Moving the position of the geometry of a group of lots (by floor for example) looks also promising. Although this interview-based approach is subjective and empirical, it helps us to better consider the end-user's interests and take into consideration their professional opinion and requirements. The 30 Visual solutions produced during these first experiments constitute a useful foundation for further analysis.
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Visualization principles in 3d cadastre a first assessment of Visual Variables
2012Co-Authors: Chen Wang, Jacynthe Pouliot, Frederic HubertAbstract:SUMMARY This paper proposes to investigate which among Visual Variables are more appropriate (if they are) for geo-Visualization of 3D legal units in a probable 3D cadastre system. Visual Variables, as proposed by Bertin (1983), include position, size, shape, value, color, orientation and texture. The appropriateness is evaluated base on whether a Visual Variable can be selective or not in the context of Visualising 3D cadastral features. From a literature review, five requirements are identified and used to carry out the assessment. Namely they are represent bounded and partial bounded 3D legal units, represent the relationship between 3D legal units and 2D land parcels, represent the relationship of 3D legal units with corresponding physical object, represent spatial relationships among 3D legal units and label with official measurements. The results clearly show that changing the position of the Visual Variable for selectivity purpose is not an adequate strategy, except to distinguish bounded and unbounded 3D legal units. A change in size of point and line or in color is fully suitable no matter is the requirement. If there is light source and shading effect in 3D cadastre Visualization, value is not a promising choice. However, in a self-illuminating situation, in which there is no light source and shading effect, value could be used to represent all situations. Labeling with official measurements is the requirement the least fulfil.
Chen Wang - One of the best experts on this subject based on the ideXlab platform.
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how users perceive transparency in the 3d Visualization of cadastre testing its usability in an online questionnaire
Geoinformatica, 2017Co-Authors: Chen Wang, Jacynthe Pouliot, Frederic HubertAbstract:Using transparency as a Visual Variable in 3D geo-Visualization offers several advantages since it can encode underlying data and at the same time relieve the occlusion. However, the usability of transparency has yet to be tested with intended users and it might vary from one application domain to another or from one task to another. This research project addresses the usability of transparency in 3D cadastre Visualization, more specifically whether it helps users delimit property units (administrative boundaries) with their physical counterparts (e.g., walls) in condominium situation. In this situation, three types of boundaries (simple physical, simple administrative, and linked boundary, which is both physical and administrative) are involved in Visualization, and three different transparency levels are used to represent these types. Empirical tests are administered in the form of an online questionnaire for university students in law (notarial law) and land surveying. The results show that, in general, using three different transparency levels is preferable and efficient solution to help users demarcate property units with their physical counterparts, and 63% participants correctly achieved their Visual tasks with this design. Also, the transparency settings influence user's performance. For example, applying very high transparency to simple administrative boundaries as compared to simple physical boundaries improves user certainty. Another important discovery is that many university students in notarial law are inexperienced with 3D Visualization, and such inexperience affects the viewer's certitude when carrying out Visual tasks.
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experiments with notaries about the semiology of 3d cadastral models
ISPRS - International Archives of the Photogrammetry Remote Sensing and Spatial Information Sciences, 2013Co-Authors: Jacynthe Pouliot, Chen Wang, Frederic Hubert, Vivien Fuchs, M BedardAbstract:Based on the hypothesis that 3D cadastral models are helpful for notaries, this study investigates the performance of Visual Variables for the Visualization of 3D models. The approach undertaken uses face-to-face interviews with notaries involved in co-ownership establishment. A 3D geometric model of a complex condominium building is used as the studied case to which a selection of Visual Variables is applied. Thirty Visual solutions are tested against six notarial Visualization tasks and notaries are asked several questions. Based on the preliminary responses, we can now say that colour is the Visual Variable most appreciated by notaries, regardless of the Visualization task. The use of transparency is helpful in many cases, more specifically when reading annotation (official measures). However, confusion arises when too extensive geometry of 3D lots is viewed simultaneously, and unnecessary when the geometry of the lots is fully visible. Moving the position of the geometry of a group of lots (by floor for example) looks also promising. Although this interview-based approach is subjective and empirical, it helps us to better consider the end-user's interests and take into consideration their professional opinion and requirements. The 30 Visual solutions produced during these first experiments constitute a useful foundation for further analysis.
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Visualization principles in 3d cadastre a first assessment of Visual Variables
2012Co-Authors: Chen Wang, Jacynthe Pouliot, Frederic HubertAbstract:SUMMARY This paper proposes to investigate which among Visual Variables are more appropriate (if they are) for geo-Visualization of 3D legal units in a probable 3D cadastre system. Visual Variables, as proposed by Bertin (1983), include position, size, shape, value, color, orientation and texture. The appropriateness is evaluated base on whether a Visual Variable can be selective or not in the context of Visualising 3D cadastral features. From a literature review, five requirements are identified and used to carry out the assessment. Namely they are represent bounded and partial bounded 3D legal units, represent the relationship between 3D legal units and 2D land parcels, represent the relationship of 3D legal units with corresponding physical object, represent spatial relationships among 3D legal units and label with official measurements. The results clearly show that changing the position of the Visual Variable for selectivity purpose is not an adequate strategy, except to distinguish bounded and unbounded 3D legal units. A change in size of point and line or in color is fully suitable no matter is the requirement. If there is light source and shading effect in 3D cadastre Visualization, value is not a promising choice. However, in a self-illuminating situation, in which there is no light source and shading effect, value could be used to represent all situations. Labeling with official measurements is the requirement the least fulfil.
Nadia Boukhelifa - One of the best experts on this subject based on the ideXlab platform.
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Evaluating Sketchiness as a Visual Variable for the Depiction of Qualitative Uncertainty
IEEE Transactions on Visualization and Computer Graphics, 2012Co-Authors: Nadia Boukhelifa, Anastasia Bezerianos, Tobias Isenberg, Jean-daniel FeketeAbstract:We report on results of a series of user studies on the perception of four Visual Variables that are commonly used in the literature to depict uncertainty. To the best of our knowledge, we provide the first formal evaluation of the use of these Variables to facilitate an easier reading of uncertainty in Visualizations that rely on line graphical primitives. In addition to blur, dashing and grayscale, we investigate the use of 'sketchiness' as a Visual Variable because it conveys Visual impreciseness that may be associated with data quality. Inspired by work in non-photorealistic rendering and by the features of hand-drawn lines, we generate line trajectories that resemble hand-drawn strokes of various levels of proficiency--ranging from child to adult strokes--where the amount of perturbations in the line corresponds to the level of uncertainty in the data. Our results show that sketchiness is a viable alternative for the Visualization of uncertainty in lines and is as intuitive as blur; although people subjectively prefer dashing style over blur, grayscale and sketchiness. We discuss advantages and limitations of each technique and conclude with design considerations on how to deploy these Visual Variables to effectively depict various levels of uncertainty for line marks.
