9 results on '"map transformation"'
Search Results
2. Mapping the global spatio-temporal dynamics of COVID-19 outbreak using cartograms during the first 150 days of the pandemic.
- Author
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Yalcin, Mustafa
- Subjects
COVID-19 pandemic ,COVID-19 ,GEOGRAPHIC information systems ,PANDEMICS ,SARS-CoV-2 ,WORLD health - Abstract
The novel coronavirus (COVID-19) pandemic is a public health emergency of international concern that caused disaster consequences all over the world. To mitigate and manage the pandemic, geographical information systems (GIS)-based spatial analysis has been used in a key role. To this aim, many GIS-based maps are produced by many national and international institutions. However, the produced maps are prepared by conventional methods and the features in these maps representing by their areal size. This paper proposes the diffusion-based cartograms for visualization of the COVID-19 outbreak. In the study, daily country-level data of the first 150 days of the COVID-19 outbreak were obtained from WHO, and the spread and spatial patterns of the epidemic were presented according to the number of confirmed cases and deaths. As a result of the study, it was observed that the cartogram is a powerful visualization tool and superior to the classical methods. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
3. Being Smarter about Space: Drawing Lessons from Spatial Science.
- Author
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Poorthuis, Ate and Zook, Matthew
- Subjects
DIGITAL technology ,GEOGRAPHIC information systems ,GENTRIFICATION ,DEBATE ,QUANTITATIVE research - Abstract
Copyright of Annals of the American Association of Geographers is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2020
- Full Text
- View/download PDF
4. Smart Cartographic Background Symbolization for Map Mashups in Geoportals: A Proof of Concept by Example of Landuse Representation.
- Author
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Panchaud, Nadia H. and Hurni, Lorenz
- Subjects
CARTOGRAPHY ,GEOGRAPHIC information systems ,CARTOGRAPHIC materials - Abstract
Geospatial data are now widely available to the general public thanks to geoportals and online mapping platforms. However, creating a map involves more than just combining data layers. Thus we develop cartographic functions for geoportals to support better visual hierarchy in user map mashups. This includes a couple of preparatory steps followed by a smart cartographic background symbolization derived from the original layer style. We evaluate different approaches to background symbolization: greyscale, desaturation, and smart background. The different background symbolization methods are analysed with two concrete map examples and evaluated with a survey. The smart background symbolization developed in this work improves the visual hierarchy of the map mashup by reducing the visual importance of the background layers. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
5. Attribute trajectory analysis: a framework to analyse attribute changes using trajectory analysis techniques.
- Author
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Zhang, Long and Van de Weghe, Nico
- Subjects
TRAJECTORY measurements ,GEOGRAPHIC spatial analysis ,GEOGRAPHIC information systems ,ATTRIBUTE focusing (Data mining) ,GRAPH theory - Abstract
Trajectory analysis has attracted growing attention in the research field of geography. Beyond traditional moving object trajectories, another type of trajectory exists in which the coordinates are object attributes rather than geographical coordinates. In this paper, a framework to analyse these so-called attribute trajectories is proposed that uses four techniques typically employed in the analysis of moving object trajectories: the Reeb graph, the similarity matrix, the convoy and the mega-convoy. The Reeb graph provides the ability to visualise the temporal dynamics of attribute similarities. The similarity matrix is a supplement of the Reeb graph whose purpose is to visualise the pairwise similarities among the attributes. Moreover, the similarity matrix forms a basis for clustering. The convoy highlights objects whose attributes remain similar for a sufficiently long period. The mega-convoy reduces the number of convoys and reveals their evolutionary histories by merging overlapping convoys. A small real-world meteorological dataset is used as an example to illustrate the attribute trajectory analysis framework and the techniques. This paper aims to form a starting point for applying trajectory analysis techniques in many research fields. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
6. Visualizing Travel Patterns with a GPS Dataset: How Commuting Routes Influence Non-Work Travel Behavior.
- Author
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Wang, Xiaoguang, Grengs, Joe, and Kostyniuk, Lidia
- Subjects
GLOBAL Positioning System ,GEOGRAPHIC information systems ,COMMUTING ,TRAVEL ,DISTANCES - Abstract
This paper examines the spatial patterns of non-work activities for 34 drivers in the Southeast Michigan region. Capitalizing upon a unique global positioning systems (GPS) dataset and GIS visualization techniques, this study quantifies the spatial distributions of non-work activities for drivers with different commuting distances, and for non-work activities that are chained in different types of travel (commute travel vs. non-commute travel). We find a strong dependence of non-work activity locations on commuting distances, and an influence of commuting routes on non-work activities chained in all types of travel. The results underline the importance of commuting routes in shaping the spatial configuration of non-work activities. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
7. A Novel Algorithm of Buffer Construction Based on Run-length Encoding.
- Author
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Jiechen Wang, Can Cui, Yingxia Pu, Jinsong Ma, and Gang Chen
- Subjects
ALGORITHMS ,GRIDS (Cartography) ,BUFFER zones (Ecosystem management) ,GEOGRAPHIC information systems ,DIGITIZATION ,VECTOR data - Abstract
This paper presents an algorithm of buffer construction incorporating run-length encoding and the idea of raster overlay method. In traditional raster methods, the buffer target is traced and scanned using a 'brush', the width of which is equal to the buffer distance. During this process, the brushed raster grids are marked. Then by carrying out dynamic calculation on these marked grids, the buffer zone, constituted of grids, would be generated. Finally, the desired boundary of the buffer zone could be obtained through vectorisation. Considering the obvious drawbacks of raster data in computing efficiency and storage capacity, this paper puts forward the idea of storing raster data by means of run-length encoding, on which the raster-based operations are carried out. In order to improve the spatial precision, the borderlines of each run-length unit are recorded in the data of real type. The tests and analyses indicate that this algorithm has integrated advantages with respect to time complexity, space complexity and computational accuracy. [ABSTRACT FROM AUTHOR] - Published
- 2010
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8. An initial formal model for spatial data infrastructures.
- Author
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Hjelmager, Jan, Moellering, Harold, Cooper, Antony, Delgado, Tatiana, Rajabifard, Abbas, Rapant, Petr, Danko, David, Huet, Michel, Laurent, Dominique, Aalders, Henri, Iwaniak, Adam, Abad, Paloma, Düren, Ulrich, and Martynenko, Alexander
- Subjects
DISTRIBUTED computing ,ELECTRONIC data processing ,SPATIAL data infrastructures ,GEOGRAPHIC information systems ,CARTOGRAPHY ,GRAPHIC methods - Abstract
The Commission on Spatial Data Standards of the International Cartographic Association is working to define formal models and technical characteristics of Spatial Data Infrastructures (SDI). To date, this work has been restricted to the Enterprise and Information Viewpoints from the ISO Reference Model for Open Distributed Processing standard. The Commission has developed models for these two viewpoints. These models describe how the different parts of an SDI fit together in the viewpoints in question. These models should be seen as a contribution towards the overall model of the SDI and its technical characteristics. During the model development process, the roles of the different Actors in an SDI in the Enterprise and Information Viewpoints have also been identified in Use Case diagrams of an SDI. All the models have been developed using the Unified Modeling Language. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
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9. GIS-based multicriteria spatial modeling generic framework.
- Author
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Chakhar, S. and Mousseau, V.
- Subjects
GEOGRAPHIC information systems ,INFORMATION resources ,UNITS of measurement ,PROTOTYPES ,GEOGRAPHY ,GEODATABASES - Abstract
Multicriteria analysis is a set of mathematical tools and methods allowing the comparison of different alternatives according to many criteria, often conflicting, to guide the decision maker towards a judicious choice. Multicriteria methods are used in spatial context to evaluate and compare spatial decision alternatives, often modeled through constraint-based suitability analysis and represented by point, line, and polygon features or their combination, and evaluated on several space-related criteria, to select a restricted subset for implementation. Outranking methods, a family of multicriteria methods, may be useful in spatial decision problems, especially when ordinal evaluation criteria are implied. However, it is recognized that these methods, except those devoted to multicriteria classification problems, are subject to computational limitations with respect to the number of alternatives. This paper proposes a framework to facilitate the incorporation and use of outranking methods in geographical information systems (GIS). The framework is composed of two phases. The first phase allows producing a planar subdivision of the study area obtained by combining a set of criteria maps; each represents a particular vision of the decision problem. The result is a set of non-overlapping spatial units. The second phase allows constructing decision alternatives by combining the spatial units. Point, line and polygon feature-based decision alternatives are then constructed as an individual, a grouping of linearly adjacent or a grouping of contiguous spatial units. This permits us to reduce considerably the number of alternatives, enabling the use of outranking methods. The framework is illustrated through the development of a prototype and through a step-by-step application to a corridor identification problem. This paper includes also a discussion of some conceptual and technical issues related to the framework. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF
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