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

共 1042 条记录，以下是571-580 订阅

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Central Places in Wikipedia 18th

Central Places in Wikipedia

引用

18th Association-of-Geographic-Information-Laboratories-for-Europe Conference on Geographic Information Science (AGILE)

作者： Kessler, Carsten CUNY Hunter Coll Ctr Adv Res Spatial Informat New York NY 10021 USA CUNY Hunter Coll Dept Geog New York NY 10021 USA

ISBN: (纸本)9783319167879;9783319167862

Central Place Theory explains the number and locations of cities, towns, and villages based on principles of market areas, transportation, and socio-political interactions between settlements. It assumes a hexagonal segmentation of space, where every central place is surrounded by six lower-order settlements in its range, to which it caters its goods and services. In reality, this ideal hexagonal model is often skewed based on varying population densities, locations of natural features and resources, and other factors. In this paper, we propose an approach that extracts the structure around a central place and its range from the link structure on the Web. Using a corpus of georeferenced documents from the English language edition of Wikipedia, we combine weighted links between places and semantic annotations to compute the convex hull of a central place, marking its range. We compare the results obtained to the structures predicted by Central Place Theory, demonstrating that the Web and its hyperlink structure can indeed be used to infer spatial structures in the real world. We demonstrate our approach for the four largest metropolitan areas in the United States, namely New York City, Los Angeles, Chicago, and Houston.

关键词： Hypertext systems

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Labeling Streets Along a Route in Interactive 3D Maps Using Billboards 18th

Labeling Streets Along a Route in Interactive 3D Maps Using ...

引用

18th Association-of-Geographic-Information-Laboratories-for-Europe Conference on Geographic Information Science (AGILE)

作者： Schwartges, Nadine Morgan, Benjamin Haunert, Jan-Henrik Wolff, Alexander Univ Wurzburg Lehrstuhl Informat 1 Wurzburg Germany Univ Osnabruck Inst Geoinformat & Fernerkundung Osnabruck Germany

ISBN: (纸本)9783319167879;9783319167862

We consider the problem of labeling linear objects, such as streets, in interactive 3D maps, where the user can continuously pan, zoom, and rotate a perspective view of the scene. We dynamically annotate streets that belong to a user's route, assuming that the future course of the route, within the currently visible part of the map, is known or well predicted. We use billboards as annotations, that is, each label is a rectangle holding the annotation text, is oriented towards the user, placed at some distance above the midpoint of the street to be labeled, and connected to the point by a vertical line segment, the leader. Our goal is to maintain an overlap-free labeling that reacts to changes of the view in real time. To this end, we dynamically vary the lengths of the leaders. In order to achieve that labels move smoothly, we do not strictly forbid label-label overlaps. We present a force-directed algorithm that applies forces to labels to cause overlapping labels to repel each other, while keeping leaders as close to their desired length as possible. On real-world data, with a realistic number of labels, we obtain frame rates of more than 400 frames per second, while drastically reducing the total overlapped area per frame, compared to an algorithm with fixed leader lengths.

关键词： Dynamic maps Interactive maps Map labeling Street labeling Billboards

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Smart Cities: Concepts, Perceptions and Lessons for Planners

引用

Conference on Computers in Urban Planning and Urban Management (CUPUM)

作者： Ching, Tuan-Yee Ferreira, Joseph, Jr. Urban Redev Author Singapore 069118 Singapore MIT Dept Urban Studies & Planning Cambridge MA 02139 USA

ISBN: (纸本)9783319183688;9783319183671

What is a "smart" city? This paper examines concepts and perceptions of city officials from six "smart" cities, Boston, San Francisco, Amsterdam, Stockholm, Singapore and Rio de Janeiro. Their "smart" efforts, gathered through interviews and secondary sources, are analyzed against four theories of "smart" cities;(a) "smart machines" and informated organizations, (b) partnerships and collaboration, (c) learning and adaptation, and (d) investing for the future. The findings show that instead of converging toward a single definition of being "smart", the cities have taken different approaches in planning and implementation, and adopt different combinations of elements from the theories. The cities' experiences and elements of being "smart" are distilled and presented as learning points and pathways for other cities.

关键词： Smart city

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Detecting Spatial and Temporal Route Information of GPS Traces 11

Detecting Spatial and Temporal Route Information of GPS Trac...

引用

11th Symposium on Geoinformatics for Intelligent Transportation (GIS)

作者： Feng, Tao Timmermans, Harry J. P. Eindhoven Univ Technol Urban Planning Grp Dept Built Environm NL-5600 MB Eindhoven Netherlands

ISBN: (纸本)9783319114637;9783319114620

This paper aims at detecting route information of GPS traces to represent spatial and temporal information of trips. A Bayesian belief network model is used to calculate the probability of a road matching a GPS log point. The algorithm incorporates road network topology, distance from trace nodes to road segments, the angle between two lines, direction difference, accuracy of measured GPS log point, and position of roads. GPS data collected in the Eindhoven region, The Netherlands, is used to examine the performance of this algorithm. Results based on a small sample show that the algorithm has a good performance in both processing efficiency and prediction accuracy of correctly identified instances. Prediction accuracy using a small sample is 87.02 %.

关键词： Bayesian belief network GPS Map matching Road network

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Modeling and Managing Topology for 3-D Track Planning Applications 9th

Modeling and Managing Topology for 3-D Track Planning Applic...

引用

Conference on 3D geoinformation Science (3D GeoInfo)

作者： Butwilowski, Edgar Thomsen, Andreas Breunig, Martin Kuper, Paul V. Al-Doori, Mulhim Karlsruhe Inst Technol Karlsruhe Germany Amer Univ Dubai Dubai U Arab Emirates

ISBN: (纸本)9783319121819;9783319121802

Topology plays a central role in the modelling and management of n-d geo-information. However, hitherto the standardization of n-d topological data models is still at its beginning. A general model based on oriented hierarchical d-Generalised Maps is proposed to handle topology in object-oriented geo-database management systems. The implementation of the approach is demonstrated as module in DB4GeO, our service-oriented 3-dgeo-database architecture. A 3-d tracks planning application example in the city of Munich is presented demonstrating the usage of the n-d topological model. Finally, an outlook on our ongoing 3-d geoinfo research in the Dubai region is given.

关键词： n-d topology Geo-database Tracks planning 3-D planning application

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Design of Test Base for Determine Volume Accuracy

Design of Test Base for Determine Volume Accuracy

引用

GIS Ostrava Compilation Surface Models for Geosciences.

作者： Safar, Vaclav Res Inst Geodesy Topog & Cartog Ustecka 98 Zdiby 25066 Czech Republic

ISBN: (纸本)9783319184074;9783319184067

This paper describes how the first test base for Remotely Piloted Aerial Systems (RPAS) was built. Aerial photos was done with non-metric cameras Canon 700D. Using the software Agisoft PhotoScan were created orthophotos and Digital Surface Model (DSM). Ortophotos and DSM were calculated in four variants. Computing variants are different in number of ground control points (GCP) entered. Rectangular plane coordinates of check points were read from the orthophoto maps in all variants. Heights of these points were read from DSM in all variants too. The article analyzes the accuracy of check points in all variants. These experiences are nested into the design parameters of the new test base for using in opencast mining. Proposal for a new test base must accept the conditions laid by the Czech Mining Authority for determination of the surface, area and volume, which will comply with upcoming amendment regulation No 435/92.

关键词： RPAS Non-metric cameras DSM

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Statistical Learning Approach for Wind Speed Distribution Mapping: The UK as a Case Study 18th

Statistical Learning Approach for Wind Speed Distribution Ma...

引用

18th Association-of-Geographic-Information-Laboratories-for-Europe Conference on Geographic Information Science (AGILE)

作者： Veronesi, Fabio Grassi, Stefano Raubal, Martin Hurni, Lorenz ETH Inst Cartog & Geoinformat Stefano Franscini Pl 5 CH-8093 Zurich Switzerland

ISBN: (纸本)9783319167879;9783319167862

Wind resource assessment is fundamental when selecting a site for wind energy projects. Wind speed is influenced by a plethora of environmental factors and understanding its spatial variability is key for determining the economic viability of a site. Deterministic estimation methods, which are based on physics, represent the industry standard in wind-speed mapping. Over the years, these methods have proven capable of estimating wind speed with a relatively high accuracy. However measuring stations, which provide the starting data for all wind speed estimations, are often located at a distance from each other, in some cases, tens of kilometres or more. This adds an unavoidable level of uncertainty to the estimates, which deterministic methods fail to take into account. For this reason, even though there are ways of determining the overall uncertainty of the estimation, e.g. cross-validation, deterministic methods do not provide means of assessing the site-specific uncertainty. This paper introduces a statistical method for estimating wind speed, based on spatial statistics. In particular, we present a statistical learning approach, based on ensembles of regression trees, to estimate both the wind distribution in specific locations and to assess the site-specific uncertainty.

关键词： Wind speed Statistical learning Geostatistics Weibull distribution Random forest

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Enabling Semantic Search and Knowledge Discovery for ArcGIS Online: A Linked-Data-Driven Approach 18th

Enabling Semantic Search and Knowledge Discovery for ArcGIS ...

引用

18th Association-of-Geographic-Information-Laboratories-for-Europe Conference on Geographic Information Science (AGILE)

作者： Hu, Yingjie Janowicz, Krzysztof Prasad, Sathya Gao, Song Univ Calif Santa Barbara STKO Lab Santa Barbara CA 93106 USA ESRI Inc Applicat Prototype Lab Redlands CA USA

ISBN: (纸本)9783319167879;9783319167862

ArcGIS Online is a unified Web portal designed by Environment System Research Institute (ESRI). It contains a rich collection of Web maps, layers, and services contributed by GIS users throughout the world. The metadata about these GIS resources reside in data silos that can be accessed via a Web API. While this is sufficient for simple syntax-based searches, it does not support more advanced queries, e.g., finding maps based on the semantics of the search terms, or performing customized queries that are not pre-designed in the API. In metadata, titles and descriptions are commonly available attributes which provide important information about the content of the GIS resources. However, such data cannot be easily used since they are in the form of unstructured natural language. To address these difficulties, we combine data-driven techniques with theory-driven approaches to enable semantic search and knowledge discovery for ArcGIS Online. We develop an ontology for ArcGIS Online data, convert the metadata into Linked Data, and enrich the metadata by extracting thematic concepts and geographic entities from titles and descriptions. Based on a human participant experiment, we calibrate a linear regression model for semantic search, and demonstrate the flexible queries for knowledge discovery that are not possible in the existing Web API. While this research is based on the ArcGIS Online data, the presented methods can also be applied to other GIS cloud services and data infrastructures.

关键词： Metadata Semantic search Linked data Geoportal ArcGIS online

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Using Location-Based Social Media for Ranking Individual Familiarity with Places: A Case Study with Foursquare Check-in Data 11th

Using Location-Based Social Media for Ranking Individual Fam...

引用

11th International Symposium on Location Based Services

作者： Wang, Wangshu Vienna Univ Technol Res Grp Cartog Vienna Austria

ISBN: (纸本)9783319118796;9783319118789

The growing popularity of location aware social media provides a unique opportunity to study individual knowledge of the environment, e.g., individual familiarity with places. With Foursquare being one of the most popular location-based social media, in this paper, we focus on ranking individual familiarity with places using Foursquare check-in data. Our method firstly identifies individually meaningful places. Then, the identified meaningful places are ranked according to individual's familiarity with them, i.e., the weighting that we assigned to each place based on the information indicated by the tagging activities. Results of the evaluation demonstrate the possibility of ranking individual familiarity with places using location-based social media.

关键词： Place identification Location-based social media Spatial cognition

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Change Detection of Cities 9th

Change Detection of Cities

引用

Conference on 3D geoinformation Science (3D GeoInfo)

作者： Pedrinis, F. Morel, M. Gesquiere, G. LIRIS Univ Lyon WG 2 2 Commiss 2 Lyon France

ISBN: (纸本)9783319121819;9783319121802

Today, many cities have at their disposal a digital model useful in many applications such as decision making in urban planning. 3D data representing objects in the city such as land and buildings often comes from successive acquisition campaigns. Unfortunately, digital models of cities can have many versions of the same area. Having tools to detect changes becomes a necessity. It is then possible to highlight any differences between multiple versions of the same area in 3D. A second application can be related to the possibility of making a temporal representation by taking into account the detected changes. In this paper, we propose a set of tools to detect changes. The use case is done on buildings. Our method is based on CityGML and cadastre files. The output is a CityGML file containing a representation of the evolution over time of the objects in the city.

关键词： 3D city modeling Change detection Urban planning CityGML Temporality

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