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

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A Novel Approach to Mining Travel Sequences Using Collections of Geotagged Photos

A Novel Approach to Mining Travel Sequences Using Collection...

引用

13th AGILE International Conference on Geographic Information Science

作者： Kisilevich, Slava Keim, Daniel Rokach, Lior Univ Konstanz Constance Germany Ben Gurion Univ Negev Dept Informat Syst Engn Beer Sheva Israel Ben Gurion Univ Negev Deutsche Telekom Lab Beer Sheva Israel

ISBN: (纸本)9783642123252

In this paper we present a novel approach for analyzing the trajectories of moving objects and of people in particular. The mined data from these sequences can provide valuable information for understanding the surrounding locations, discovering attractive place or mining frequent sequences of visited places. Based on geotagged photos, our framework mines semantically annotated sequences. Our framework is capable of mining semantically annotated sequences of any length to discover patterns that are not necessarily immediate antecedents. The approach consists of four main steps. In the first step, every photo location is semantically annotated by assigning it to a known nearby point of interest. In the second step, a density-based clustering algorithm is applied to all unassigned photos, creating regions of unknown points of interest. In the third step, a travel sequence of every individual is built. In the final step, travel sequence patterns are mined using the semantics that were obtained from the first two steps. Case studies of Guimaraes, Portugal (where the conference takes place) and Berlin, Germany demonstrate the capabilities of the proposed framework.

关键词： sequence mining trajectories sequence patterns

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Pre-School Facilities and Catchment Area Profiling: a Planning Support Method

Pre-School Facilities and Catchment Area Profiling: a Planni...

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13th AGILE International Conference on Geographic Information Science

作者： Costa, Claudia Santana, Paula Santos, Rita Loureiro, Adriana Univ Coimbra Geog Studies Inst P-3000043 Coimbra Portugal Univ Coimbra Geog & Planning Studies Ctr P-3000043 Coimbra Portugal Dept Arquitectura P-3000043 Coimbra Portugal

ISBN: (纸本)9783642123252

For the effective implementation of social support facilities or infrastructures, knowledge of the physical and sociodemographic characteristics of the catchment area is required. However, it is precisely the definition and profiling of this catchment area that causes the main problems. This paper raises the question of the Modifiable Areal Unit Problem (MAUP) and presents a method for catchment area profiling that takes account of socioeconomic and contextual attributes. Facility catchment areas are defined by a function that takes account of context indicators, enabling a broader yet more precise (and therefore more thorough) profiling of the area. As a case study in the application of this method, this paper describes the existing supply of pre-school facilities in the municipality of Amadora and analyses the area's needs with regards to further nursery schools or kindergarten facilities.

关键词： Group facilities education and childcare establishments MAUP catchment areas Geographic Information Systems

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Geospatial Annotations for 3D Environments and their WFS-based Implementation

Geospatial Annotations for 3D Environments and their WFS-bas...

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13th AGILE International Conference on Geographic Information Science

作者： Klimke, Jan Doellner, Juergen Univ Potsdam Hasso Plattner Inst D-14482 Potsdam Germany

ISBN: (纸本)9783642123252

Collaborative geovisualization provides effective means to communicate spatial information among a group of users. Annotations as one key element of collaborative geovisualization systems enable comprehension of collaboration processes and support time-shifted communication. By annotations we refer to user-generated information such as remarks, comments, findings and any other information related to the 3D environment. They have to be efficiently modeled, stored and visualized while precisely retaining their spatial reference and creation context. Existing models for annotations generally do not fully support spatial references and, therefore, do not fully take advantage of the spatial relationships associated with annotations. This paper presents a GML-based data model for geospatial annotations that explicitly incorporates spatial references and allows different types of annotations to be stored together with their context of creation. With this approach annotations can be represented as first-class spatial features. Consequently, annotations can be seamlessly integrated into their 3D environment and the author's original intention and message can be better expressed and understood. An OGC Web Feature Service is used as standardized interface for storage and retrieval of annotations, which assures data interoperability with existing geodata infrastructures. We have identified three types of annotation subjects, namely geographic features, geometry, and scene views, represented by their corresponding 2D/3D geometry. The model also defines a point-based approximation for complex geometry, such that annotations can also be used by client application with limited abilities regarding display size, band-width or geometry handling. Furthermore we extended our model by annotations that can contain 3D geometry besides textual information. In this way the expressiveness of annotations can be further enhanced for communicating spatial relationships such as distances or arran

关键词： Geometry

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iNav: An Indoor Navigation Model Supporting Length-Dependent Optimal Routing

iNav: An Indoor Navigation Model Supporting Length-Dependent...

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13th AGILE International Conference on Geographic Information Science

作者： Yuan, Wenjie Schneider, Markus Univ Florida Dept Comp & Informat Sci & Engn Gainesville FL 32611 USA

ISBN: (纸本)9783642123252

People may have problems in finding their way to destinations in large buildings. This raises a need of designing and constructing indoor navigation systems. However, none of the available indoor navigation models can automatically calculate shortest paths according to the geometric structure of indoor space. The reasons are that those models which use geometric information produce circuitous routes and that those models which do not consider geometric information only provide very coarse routes. This paper proposes a model to construct a way finding indoor network that is based on the geometry of the indoor space and that supports length-dependent optimal routing.

关键词： Geometry

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MIMEXT: a KML Extension for Georeferencing and Easy Share MIME Type Resources

MIMEXT: a KML Extension for Georeferencing and Easy Share MI...

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13th AGILE International Conference on Geographic Information Science

作者： Abargues, Carlos Beltran, Arturo Granell, Carlos Univ Jaume 1 Ctr Interact Visualizat Castellon de La Plana Spain

ISBN: (纸本)9783642123252

Georeferenced information is becoming more important in today's society leading to different techniques for georeferencing resources. Most of these techniques present some problems by the internal modification of the file and/or because of these are designed for very specific use cases, so supported formats are very limited. However, in this paper we present a new approach for a global solution to georeference and share any kind of Multipurpose Internet Mail Extensions (MIME) type resources. The proposed solution is based on the use of the Keyhole Markup Language (KML) and a new extension called MIMEXT for the annotation and georeference of these MIME type resources. The KML file containing the description for the resource and its geolocation is encapsulated within a KMZ file with the own resource and any other related resources such as licenses or thumbnails. This technique could facilitate to distribute, visualize and georeference a wide range of resource types not conveniently exploited yet in the GIS context.

关键词： Markup languages

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Visit Potential: A Common Vocabulary for the Analysis of Entity-Location Interactions in Mobility Applications

Visit Potential: A Common Vocabulary for the Analysis of Ent...

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13th AGILE International Conference on Geographic Information Science

作者： Koerner, Christine Hecker, Dirk May, Michael Wrobel, Stefan Fraunhofer IAIS D-53754 Schloss Birlinghoven Sankt Augustin Germany

ISBN: (纸本)9783642123252

A growing number of companies and public institutions use mobility data in their day-to-day business. One type of usage is the analysis of spatio-temporal interactions between mobile entities and geographic locations. In practice the employed measures depend on application demands and use context-specific terminology. Thus, a patchwork of measures has evolved which is not suitable for methodological research and interdisciplinary exchange of ideas. The measures lack a systematic formalization and a uniform terminology. In this paper we therefore systematically define measures for entity-location interactions which we name visit potential. We provide a common vocabulary that can be applied for an entire class of mobility applications. We present two real-world scenarios which apply entity-location interaction measures and demonstrate how the employed measures can be precisely defined in terms of visit potential.

关键词： Terminology

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A Visual Query Language for Spatial Data Warehouses

A Visual Query Language for Spatial Data Warehouses

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13th AGILE International Conference on Geographic Information Science

作者： Bimonte, Sandro Del Fatto, Vincenzo Paolino, Luca Sebillo, Monica Vitiello, Giuliana Irstea UR TSCF 24 Ave Landais F-63172 Clermont Ferrand France Univ Salerno Dipartimento Matemat & Informat I-84084 Fisciano Italy

ISBN: (纸本)9783642123252

SOLAP systems are technologies intended to support geographic business intelligence. They allow decision-makers to explore and analyze a large amount of geo-referenced data usually through interactive browsing user interfaces. In this paper, we explore a new interactive methodology which supports users to query and aggregate this kind of structured data by means of specific visual notations. The widely recognized capability of visual query languages to bridge the gap between users' expertise and advanced query formulation adds effectiveness to the methodology, thus providing a useful support for posing correct SOLAP expressions by spatially arranging visual metaphors in a simple and intuitive way.

关键词： Data warehouses

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Suggestive Geo-Tagging Assistance for Geo-Collaboration Tools

Suggestive Geo-Tagging Assistance for Geo-Collaboration Tool...

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13th AGILE International Conference on Geographic Information Science

作者： Austerschulte, Marius Kessler, Carsten Univ Munster Inst Geoinformat D-4400 Munster Germany

ISBN: (纸本)9783642123252

An argumentation map is an online discussion forum for spatially related topics that combines the forum with an interactive map. The utility of an argumentation mapping tool highly depends on the accuracy and quantity of the geo-tags that link the discussion contributions to geographic locations. These geo-tags can be created manually by the users of the argumentation map or automatically by a geo-parsing application. However, in the case of manual geo-tagging users often do not create geo-tags as extensively as desired. In contrast, automatic geo-parsers have difficulties with the informal language often used in user-generated content and with resolving small-scale features. This paper proposes a hybrid approach for geo-tagging user-generated content which involves the users in the process but supports them with an automatic geo-parser which suggests locations. The implementation of a prototype as well as a human participants test are presented in order to analyze the geo-tagging performance of this approach. It turns out that it is possible to reduce the number of geo-tagging errors but keep the recall rate approximately constant, compared to automatic geo-parsers.

关键词： User interfaces

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Towards a Spatial Semantics to Analyze the Visual Dynamics of the Pedestrian Mobility in the Urban Fabric

Towards a Spatial Semantics to Analyze the Visual Dynamics o...

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13th AGILE International Conference on Geographic Information Science

作者： Leduc, Thomas Miguet, Francis Tourre, Vincent Woloszyn, Philippe CERMA Lab UMR CNRS 1563 6 Quai Francois MitterrandBP 16202 F-44262 Nantes 2 France Ecole Cent Nantes F-44321 Nantes 3 France Univ Rennes 2 ESO RESO lab Maison Rech Sci Sociales F-35043 Rennes France

ISBN: (纸本)9783642123252

The aim of this paper is to evaluate the impact of visual ambiences (visualscape) onto an urban pedestrian pathway. This work takes place within the interdisciplinary research project called Ambioflux, dealing with the sustainable mobility issues in the city. We add to the spatial semantic layer GDMS (Generic Datasource Management System) an innovative method based on partial isovists fields in order to compute the visibility of the pedestrian all along his pathway. This method allows "concatenating" several partial visibility polygons in order to represents the visual perception of the pedestrian. After a brief overview of the visibility analysis context, we justify the need of a specific semantic tool to develop the type of dynamics visual analysis we focus on. The remainder of this paper is dedicated to the methodology of the mobile pedestrian pathway's visual fingerprint characterization using the spatial formalism already described. At last, we present a use case based on a real city tour so as to identify the best rotation's direction from the visual perception point of view.

关键词： Visibility

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Automated Image-Based Abstraction of Aerial Images

Automated Image-Based Abstraction of Aerial Images

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13th AGILE International Conference on Geographic Information Science

作者： Semmo, Amir Kyprianidis, Jan Eric Doellner, Juergen Univ Potsdam Hasso Plattner Inst Potsdam Germany

ISBN: (纸本)9783642123252

Aerial images represent a fundamental type of geodata with a broad range of applications in GIS and geovisualization. The perception and cognitive processing of aerial images by the human, however, still is faced with the specific limitations of photorealistic depictions such as low contrast areas, unsharp object borders as well as visual noise. In this paper we present a novel technique to automatically abstract aerial images that enhances visual clarity and generalizes the contents of aerial images to improve their perception and recognition. The technique applies non-photorealistic image processing by smoothing local image regions with low contrast and emphasizing edges in image regions with high contrast. To handle the abstraction of large images, we introduce an image tiling procedure that is optimized for post-processing images on GPUs and avoids visible artifacts across junctions. This is technically achieved by filtering additional connection tiles that overlap the main tiles of the input image. The technique also allows the generation of different levels of abstraction for aerial images by computing a mipmap pyramid, where each of the mipmap levels is filtered with adapted abstraction parameters. These mipmaps can then be used to perform level-of-detail rendering of abstracted aerial images. Finally, the paper contributes a study to aerial image abstraction by analyzing the results of the abstraction process on distinctive visible elements in common aerial image types. In particular, we have identified a high abstraction potential in landscape images and a higher benefit from edge enhancement in urban environments.

关键词： Abstracting

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