An object-oriented data model built for blind navigation in outdoor space

Chen, Min; Lin, Hui; Liu, Deer; Zhang, Hongping; Yue, Songshan

doi:10.1016/j.apgeog.2015.03.004

Cited by 21 publications

(15 citation statements)

References 34 publications

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“…Beale et al (2006), Laakso et al (2013); Rice et al (2013aRice et al ( , 2013bRice et al ( , 2014 and the Pinhel Accessibility Platform (2014) offer useful examples of formal approaches for modeling pedestrian infrastructure for accessibility. Chen et al (2015) synthesize many of the best ideas from previous research in their objectoriented data model for blind navigation, including the complementary work of Laakso et al (2011Laakso et al ( , 2013. While our approach uses a data model, the crowdsourcing methodology described in this paper requires a less structured and more flexible approach for collecting transient obstacle and infrastructure data.…”

Section: Permanent and Transient Navigation Obstaclesmentioning

confidence: 95%

“…Rice et al (2011) and more recently, Karimi et al (2014) have adopted this approach with success. Laakso et al (2013) and Chen et al (2015) adopt approaches for accessibility through data modeling that allow for the definition of obstacles that can be traversed or avoided due to their minor nature. In the GMU Geocrowdsourcing Testbed, we have a moderator-generated process for tagging obstacles as being relevant to visually-impaired individuals and blind individuals, mobility-impaired individuals, or both.…”

Section: Pedestrian Network Coveragementioning

confidence: 99%

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Geocrowdsourcing and accessibility for dynamic environments

et al. 2015

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A consequence of modern society's increasing reliance on digital communication is the concurrent multiplication and narrowing of information streams, with many channels of digital information, but channels which are difficult or impossible for some individuals to access. Blind and visually-impaired individuals are often left out of this communication, unless accommodations are carefully planned and made to present the information in a usable form. The context of this research is the realm of assistive geotechnology, where web mapping technology and geographic information systems are used to provide access to enabling information and services. This paper presents research on the development of tools to provide transient obstacle information to blind, visually-impaired, and mobility-impaired individuals through crowdsourcing, and research on the general accessibility of local pedestrian networks under constraints presented by transient and permanent navigation obstacles. We discuss the social and technological dynamics associated with the creation and use of our crowdsourcing system and present our effort for comprehensive quality assessment. We conclude that crowdsourcing is a crucial technique for successful deployment of assistive geotechnology, particularly those that involve navigation, wayfinding, and travel in public space. We find that many public health services and other important resources cannot be accessed dependably without the use of crowdsourcing and other techniques for capturing dynamic, changing environmental conditions. More broadly, this paper concludes by addressing the progression of user-generated and crowdsourced content from static data contributions to dynamic placebased services and the enabling role of assistive geotechnology in providing access and help to blind, visually-impaired, and mobility-impaired individuals.

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Section: Permanent and Transient Navigation Obstaclesmentioning

confidence: 95%

Section: Pedestrian Network Coveragementioning

confidence: 99%

Geocrowdsourcing and accessibility for dynamic environments

et al. 2015

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“…As reviewed in Rice et al (2013aRice et al ( , 2013b 89,90 and Qin et al (2015a) 91 , capturing and documenting obstacle information on pedestrian pathways can be difficult and time consuming, depending on the design of the system and data model specifications. Formal approaches for modeling accessibility obstacles, such as those proposed by Laakso et al (2013) 92 and Chen et al (2015) 93 are thorough, but not well adapted for transient events. A crowdsourcing approach with a relatively less structured, flexible workflow for collecting transient obstacle and infrastructure data has shown to be effective in our local area (Paez 2014, Rice 2015 94,95 .…”

Section: Obstacle Avoidance Routing In Pedestrian Networkmentioning

confidence: 99%

Social Moderation and Dynamic Elements in Crowdsourced Geospatial Data: A Report on Quality Assessment, Dynamic Extensions and Mobile Device Engagement in the George Mason University Geocrowdsourcing Testbed

Rice¹,

Curtin²,

Pfoser³

et al. 2015

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A A r re ep po or rt t o on n q qu ua al li it ty y a as ss se es ss sm me en nt t, , d dy yn na am mi ic c e ex xt te en ns si io on ns s, , a an nd d m mo ob bi il le e d de ev vi ic ce e e en ng ga ag ge em me en nt t i in n t th he e G Ge eo or rg ge e M Ma as so on n U Un ni iv ve er rs si it ty y G Ge eo oc cr ro ow wd ds so ou ur rc ci in ng g T Te es st tb be ed AbstractThis report documents the development of the George Mason University Geocrowdsourcing Testbed (GMU-GcT), whose purpose is to provide a platform for studying the dynamics, limitations, and best practices of geocrowdsourcing. We present a comprehensive study of the social moderation process in the GMU-GcT and the quality parameters of information in the GMU-GcT. We present an analysis of device-based positioning in mobile geocrowdsourcing, and use the study and our analysis as a context for dynamic application extensions of the GMU-GcT in the areas of field-based obstacle moderation, obstacle interaction, and accessible routing.

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“…With the increasing development of data-processing and information discovery technologies, the ability to present spatial entities and geographic phenomena more dynamically and efficiently is required (Graham and Shelton 2013, Bandrova et al 2014, Chen et al 2015. Rendering map elements more efficiently is an important research target for satisfying both the visualization requirements and the demand for 2D/3D integrated information acquisition (Konecny 2011, Semmo et al 2012, Dübel et al 2014, Roth 2013.…”

Section: Introductionmentioning

confidence: 99%

A function-based linear map symbol building and rendering method using shader language

Yue

Yang

Chen

et al. 2015

International Journal of Geographical Information Science

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Maps are widely used to visualize geo-information so that map users can develop related understandings about the real world. Such a process for communicating information is largely dependent on the rendering of map elements using different symbols (points and linear and area symbols). To meet the demand of more dynamic and comprehensive visualization in map rendering, it is essential to improve the rendering efficiency. This paper focuses on these research topics, especially the difficulty in constructing and drawing linear map symbols. By employing shader language, a function-based linear symbol building and rendering method is presented in this paper. The basic idea of this function-based method is to build a map-rendering solution that employs graphic processing unit (GPU) acceleration technology to improve the rendering efficiency. A 'function' is used to represent the algorithm that draws certain simple or complex linear map symbols. This function reflects the structure of a linear map symbol (describing the symbol construction information) and also the rendering process of the symbolized linear map elements (handled on a per-pixel basis by the shader program). Based on the Open Geospatial Consortium (OGC), Styled Layer Descriptor (SLD) specifications, four basic line types (i.e., solid lines, dashed lines, gradient color lines, and transition lines) are implemented in the proposed method, and the implementation of line markers, line joins and line caps is also discussed. Three experiments are conducted to demonstrate improvements in map rendering. The results show that a variety of linear map symbols can be constructed in a uniform way, which suggests that the proposed method addresses the difficulty in drawing linear map symbols. With this method, the efficiency of rendering linear map elements is substantially improved compared to using the graphics device interface plus (GDI+) and anti-grain geometry (AGG) methods; it also provides an applicable approach for developing map rendering systems. Using this function-based concept, the complexity of building linear map symbols and drawing linear map elements can be decreased.

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An object-oriented data model built for blind navigation in outdoor space

Cited by 21 publications

References 34 publications

Geocrowdsourcing and accessibility for dynamic environments

Geocrowdsourcing and accessibility for dynamic environments

Social Moderation and Dynamic Elements in Crowdsourced Geospatial Data: A Report on Quality Assessment, Dynamic Extensions and Mobile Device Engagement in the George Mason University Geocrowdsourcing Testbed

A function-based linear map symbol building and rendering method using shader language

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