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检索条件"丛书名=Lecture Notes in Geoinformation and Cartography"

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Wi-Fi Fingerprinting with Reduced Signal Strength Observations from Long-Time Measurements 13th

Wi-Fi Fingerprinting with Reduced Signal Strength Observatio...

引用

13th Location-Based Services (LBS) Conference

作者： Retscher, Guenther Roth, Florian TU Wien Dept Geodesy & Geoinformat Res Grp Engn Geodesy Gusshausstr 27-29 E120-5 A-1040 Vienna Austria

ISBN: (纸本)9783319472898;9783319472881

Indoor positioning which uses signal strength values of Wi-Fi networks have become popular as these wireless networks often already exist and many mobile devices, such as smartphones or tablets, have built-in Wi-Fi cards. Usually fingerprinting is employed for positioning which achieves relatively low positioning accuracies on the several meter level. In the scope of this work two methods are presented which have the potential to improve the fingerprinting performance using long-time RSS observations at reference stations. Both methods employ the usage of at least three reference stations surrounding the area of interest on which signal strength observations are continuously performed during the whole measurement process. Thereby the first method uses a 2-D linear plane-interpolation for the deduction of real-time corrections. For that purpose, the measured signal strengths are reduced by the long-time measurements which are interpolated at the approximate position of the measuring point. In the second method the daily average of the long-time measurements is applied and the improvements of the measurements are calculated by the deviation from the daily average. For this method it is conceivable that a single reference station may be sufficient if it is located in the middle of the area of interest. Field tests were performed in an office building and are analyzed. The fingerprinting algorithms reached an averaged positioning accuracy of around 5 m in dependence on the used smartphone. The daily average improvements ( DAI) method provided a better performance than the interpolation method which is highly influenced by the required approximate position of the user.

关键词： Location fingerprinting Reduced RSS observations Interpolation method Daily average improvement method

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Crowd and Community Sourced Data Quality Assessment 28th

Crowd and Community Sourced Data Quality Assessment

引用

28th International Cartographic Conference (ICC)

作者： Jolivet, Laurence Olteanu-Raimond, Ana-Maria Univ Paris Est LASTIG COGIT IGN ENSG F-94160 St Mande France

ISBN: (纸本)9783319573366;9783319573359

Data quality assessment of different volunteered initiatives and platforms presents several challenges for data validation given the high amount of data collected. This paper focuses on two goals. The first consists in defining both a generic workflow and data quality indicators for validation of reports coming from crowd and community sourcing platforms. In the proposed workflow, a qualified report can be even described by each indicator separately or by a combination of them. Here, we focus mostly on analyzing the results obtained for each indicator separately. The second goal is to learn more information about contributors who has engaged in a platform proposed by a public body (i.e., the French National Mapping Agency): Who are they? How are they contributing? What are their motivations? More is known about contributors to OpenStreetMap than of any other VGI platform. Indeed, knowing the contributors is a crucial task for both motivation and data quality, especially now that public institutions are engaging with VGI.

关键词： Data quality VGI Community and crowdsourcing platform

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Perspectives in Externalizations of Mental Spatial Representations 20th

Perspectives in Externalizations of Mental Spatial Represent...

引用

20th Conference on Geographic Information Science of the Association-of-Geographic-Information-Libraries-in-Europe (AGILE)

作者： Loewen, H. Schwering, A. Krukar, J. Winter, S. Univ Munster Inst Geoinformat Heisenbergstr 2 D-48149 Munster Germany Univ Melbourne Dept Infrastruct Engn Melbourne Vic 3010 Australia

ISBN: (纸本)9783319567594;9783319567587

Place is a core component of human spatial knowledge and therefore a central topic in GI Science. People use externalizations of mental spatial representations to communicate about space. Textual descriptions and graphical descriptions are the two main modes of communication. In this paper a distinction of three scales of spatial descriptions is assumed and textual and graphical descriptions are collected and analyzed in order to investigate the differences between the spatial descriptions. Thereby the focus lies on the properties and perspectives of the descriptions. It is found that within the textual descriptions people tend to not consistently use one perspective, but switch perspectives and predominantly apply the route perspective. For the graphical descriptions there has been no clear categorization of description perspectives. However, there are differences in the properties of these descriptions that indicate different perspectives.

关键词： Spatial information extraction Communication modes Spatial description perspectives

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Personal Dimensions of Landmarks 20th

Personal Dimensions of Landmarks

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20th Conference on Geographic Information Science of the Association-of-Geographic-Information-Libraries-in-Europe (AGILE)

作者： Nuhn, Eva Timpf, Sabine Univ Augsburg Geoinformat Grp Alter Postweg 118 D-86159 Augsburg Germany

ISBN: (纸本)9783319567594;9783319567587

Landmarks are crucial elements of route instructions given by humans. The currently accepted qualification of an object as a landmark is dependent on spatial dimensions, i.e. visual, semantic and structural dimensions. However, even if an object qualifies as a landmark because of its spatial dimensions, its selection by a traveller as wayfinding aid is further influenced by the knowledge and experience of the traveller. A geographical object that is salient for one person may have no importance at all for another person. Thus, there is a need to incorporate more personal dimensions into a comprehensive model of landmarks. We propose such a multidimensional model for landmarks for pedestrians. The main contribution of this paper is the definition of the personal dimensions of landmarks as basis for a multidimensional model. The following personal dimensions are introduced and debated: spatial knowledge, interests, goals and background. Further, attributes and attribute values describing the personal dimensions are identified and data collection is discussed.

关键词： Landmarks Pedestrian navigation Wayfinding Spatial and personal dimensions

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A Framework for Enhancing Real-Time Social Media Data to Improve the Disaster Management Process 28th

A Framework for Enhancing Real-Time Social Media Data to Imp...

引用

28th International Cartographic Conference (ICC)

作者： Shah, Syed Attique Seker, Dursun Zafer Demirel, Hande Istanbul Tech Univ Dept Geomat Fac Civil Engn Istanbul Turkey

ISBN: (纸本)9783319573366;9783319573359

Social Media datasets are playing a vital role providing information that can support decision-making in nearly all domains. This is due to the fact that social media is a quick and economical approach for collecting data. It has already been proved that in case of disaster (natural or man-made) the information extracted from Social Media sites is very critical to Disaster Management Systems for response and reconstruction. This study comprises of two parts: The first proposes a framework that provides updated and filtered real time input data for the disaster management system through social media, and the second consists of a designed web user API for a structured and defined real time data input process. The aim of this study is to propose a framework that can filter and organize data from the unstructured social media sources through recognized methods and bring this retrieved data to the same level as that acquired through structured and predefined mechanisms, such as a web API. Both components are designed such that they can potentially collaborate and produce updated information for a disaster management system to carry out accurate and effective decision-making.

关键词： Crowd-sourcing GIS Disaster management Design science Social media Real-time data API

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Investigating Representations of Places with Unclear Spatial Extent in Sketch Maps 20th

Investigating Representations of Places with Unclear Spatial...

引用

20th Conference on Geographic Information Science of the Association-of-Geographic-Information-Libraries-in-Europe (AGILE)

作者： Anacta, Vanessa Joy A. Humayun, Mohammed Imaduddin Schwering, Angela Krukar, Jakub Univ Munster Inst Geoinformat Munster Germany

ISBN: (纸本)9783319567594;9783319567587

This study analyzes different ways of representing vaguely defined places from a set of sketch maps specifically when used in giving route instructions. A total of 30 participants who are familiar with the study area were asked to sketch a route map consisting of pre-identified set of places. The task involved two groups: inter-city route and inter-city route. Sketch maps were analyzed using a previously developed classification scheme to investigate how places with unclear spatial extent are represented. These were then classified into different category of places: district, site and neighborhood. Results showed that labels and regular shapes are the most preferred, as opposed to other types of sketch representations, regardless of the category of place. It also occurred that a specific place can be classified under one or more categories, which influences the type of sketch representation used.

关键词： Sketch representation Spatial vagueness Place Sketch map Wayfinding

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Building a Real-Time Geo-Targeted Event Observation (Geo) Viewer for Disaster Management and Situation Awareness 28th

Building a Real-Time Geo-Targeted Event Observation (Geo) Vi...

引用

28th International Cartographic Conference (ICC)

作者： Tsou, Ming-Hsiang Jung, Chin-Te Allen, Christopher Yang, Jiue-An Han, Su Yeon Spitzberg, Brian H. Dozier, Jessica San Diego State Univ Dept Geog Ctr Human Dynam Mobile Age San Diego CA 92182 USA Esri Beijing R&D Ctr Beijing Peoples R China San Diego State Univ Sch Commun San Diego CA 92182 USA

ISBN: (纸本)9783319573366;9783319573359

Situation awareness plays an important role in disaster response and emergency management. Displaying real-time location-based social media messages along with videos, pictures, and hashtags during a disaster event could help first responders improve their situation awareness. A geo-targeted event observation (Geo) Viewer was developed for monitoring real-time social media messages in target areas with four major functions: (1) real-time display of geo-tagged tweets within the target area;(2) interactive mapping functions;(3) spatial, text, and temporal search functions using keywords, spatial boundaries, or dates;and (4) manual labeling and text-tagging of messages. Different from traditional web GIS maps, the user interface design of GeoViewer provides the interactive display of multimedia content and maps. The front-end user interface to visualize and query tweets is built with open source programming libraries using server-side MongoDB. GeoViewer is built for assisting emergency responses and disaster management tasks by tracking disaster event impacts, recovery activities, and residents' needs in the target region.

关键词： Social media Web maps Disaster management Situation awareness Geovisualization Open source

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When Granules Are not Enough in a Theory of Granularities 20th

When Granules Are not Enough in a Theory of Granularities

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20th Conference on Geographic Information Science of the Association-of-Geographic-Information-Libraries-in-Europe (AGILE)

作者： Silva, Ricardo Almeida Pires, Joao Moura Santos, Maribel Yasmina Univ Nova Lisboa NOVA LINCS DI FCT Lisbon Portugal Univ Minho ALGORITMI Res Ctr Braga Portugal

ISBN: (纸本)9783319567594;9783319567587

Several approaches have been proposed to model spatiotemporal phenomena at multiple LoDs, in particularly, under the granular computing research area, where a granularities-based model was proposed. Such model stands out from the related literature, but has two major limitations. On one hand, it has difficulties for describing regions, intervals of time, among others complex descriptions, and on the other hand, the generalization process is the same whether it is generalizing spatial, temporal or other features of a phenomenon. These problems reduce its applicability. To overcome such limitations, this paper extends the granularities-based model by introducing the granular term concept. We apply this concept to represent time instants and intervals as well as cells and raster regions. For each granular term, generalization rules are defined so that a phenomenon can be expressed from one LoD to a coarser one in an automatic way. Changing a phenomenon's LoD can simplify granular terms, transforming for instance a time interval into a time instant or a raster region into a cell. Our contributions are shown based on a real dataset about tornadoes in the USA. The results obtained show an enhancement of application scenarios from the extended granularities-based model to its ability of providing different phenomenon's representations in each LoD, while keeping its original strengths.

关键词： Granule Granularity Granular computing

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Proceedings of workshops and posters at the 13th International Conference on Spatial Information Theory (COSIT 2017)

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丛书名： lecture notes in geoinformation and cartography

2017年

作者： Ballatore Andrea Clementini Eliseo Fogliaroni Paolo

ISBN: (纸本)9783319639468;3319639463;9783319639451

This book presents the proceedings of Workshops and Posters at the 13th International Conference on Spatial Information Theory (COSIT 2017), which is concerned with all aspects of space and spatial environments as experienced, represented and elaborated by humans, other animals and artificial agents. Complementing the main conference proceedings, workshop papers and posters investigate specialized research questions or challenges in spatial information theory and closely related topics, including advances in the conceptualization of specific spatio-temporal domains and diverse applications of spatial and temporal information.

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Choosing a Map Projection 1st ed. 2017

Choosing a Map Projection

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丛书名： lecture notes in geoinformation and cartography

2017年

作者： Miljenko Lapaine E. Lynn Usery

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