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

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Accuracy of High-Resolution Radar Images in the Estimation of Plot-Level Forest Variables 1

引用

12th Association-of-Geographic-Information-Laboratories-for-Europe (AGILE) Conference/Workshop of the International-Society-of-Photogrammetry-and-Remote-Sensing (ISPRS)

作者： Holopainen, Markus Tuominen, Sakari Karjalainen, Mika Hyyppa, Juha Vastaranta, Mikko Hyyppa, Hannu Univ Helsinki Dept Forest Resource Management Latokartanonkaari 7 Helsinki Finland

ISBN: (数字)9783642003189

ISBN: (纸本)9783642003189

In the present study, we used the airborne E-SAR radar to simulate the satellite-borne high-resolution TerraSAR radar data and determined the accuracy of the plot-level forest variable estimates produced. Estimation was carried out using the nonparametric k-nearest neighbour (k-nn) method. Variables studied included mean volume, tree species-specific volumes and their proportions of total volume, basal area, mean height and mean diameter. E-SAR-based estimates were compared with those obtained using aerial photographs and medium-resolution satellite image (Landsat ETM+) recording optical wavelength energy. The study area was located in Kirkkonummi, southern Finland. The relative RMSEs for E-SAR were 45%, 29%, 28% and 38% for mean volume, mean diameter, mean height and basal area, respectively. For aerial photographs these were 51%, 26%, 27% and 42%, and for Landsat ETM+ images 58%, 40%, 35% and 49%. Combined datasets outperformed all single-source datasets, with relative RMSEs of 26%, 23%, 33% and 39%. Of the single-source datasets, the E-SAR images were well suited for estimating mean volume, while for mean diameter, mean height and basal area the E-SAR and aerial photographs performed similarly and far better than Landsat ETM+. The aerial photographs succeeded well in the estimation of species-specific volumes and their proportions, but the combined dataset was still significantly better in volume proportions. Due to its good temporal resolution, satellite-borne radar imaging is a promising data source for forest inventories, both in large-area forest inventories and operative forest management planning. Future high-resolution synthetic aperture radar (SAR) images could be combined with airborne laser scanner data when estimating forest or even tree characteristics.

关键词： Forest inventory forest planning radar imaging E-SAR TerraSAR aerial photographs Landsat

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Research Trends in Geographic Information Science 1

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丛书名： lecture notes in geoinformation and cartography

2009年

作者： Gerhard Navratil

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Generalization of 3D Buildings Modelled by CityGML

Generalization of 3D Buildings Modelled by CityGML

引用

12th Association-of-Geographic-Information-Laboratories-for-Europe (AGILE) Conference/Workshop of the International-Society-of-Photogrammetry-and-Remote-Sensing (ISPRS)

作者： Fan, Hongchao Meng, Liqiu Jahnke, Mathias Tech Univ Munich Dept Cartog D-80333 Munich Germany

ISBN: (纸本)9783642003189

CityGML (City Geography Markup Language) not only represents the shape and graphical appearance of 3D buildings but specifically addresses the object semantics and the thematic properties, taxonomies and aggregations. The generalization algorithm presented in this paper takes this advantage of CityGML. That means that our approach considers the semantic information associated with geometrical objects of buildings to be generalized. Experiments show that the approach can reduce about 90% of the storage space of 3D buildings while keeping the information amounts as far as possible.

关键词： Generalization 3D building CityGML Typification Simplification

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Visual Analytics for Geographic Analysis, Exemplified by Different Types of Movement Data

Visual Analytics for Geographic Analysis, Exemplified by Dif...

引用

4th International Workshop on Information Fusion and Geographical Information Systems

作者： Andrienko, Gennady Andrienko, Natalia Fraunhofer Inst IAIS D-53754 Schloss Birlinghoven Sankt Augustin Germany

ISBN: (纸本)9783642003035

Visual analytics is introduced in the sense of a new research discipline defined as the science of analytical reasoning facilitated by interactive visual interfaces. Visual analytics combines automated analysis techniques with interactive visualizations so as to extend the perceptual and cognitive abilities of humans and enable them to extract useful information and derive knowledge from large and complex data, and to solve complex problems. In particular, data and problems involving geospatial components are inherently complex and therefore call for Visual analytics approaches. The problems of analyzing data about movement of various discrete objects in geographical space are discussed in detail. The paper considers three types of movement data: data describing movements of a single entity during a long time period, data about simultaneous movements of multiple unrelated entities, and data about simultaneous movements or multiple related entities. The pertinent analysis tasks significantly differ for these types of data. For each type of data, the Visual analytics techniques and tools lately developed by the authors are briefly described.

关键词： Visualization

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Transferring Segmented Properties in the Conflation of Transportation Networks 1

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12th Association-of-Geographic-Information-Laboratories-for-Europe (AGILE) Conference/Workshop of the International-Society-of-Photogrammetry-and-Remote-Sensing (ISPRS)

作者： Belussi, Alberto Liguori, Federica Marca, Jody Migliorini, Sara Negri, Mauro Pelagatti, Giuseppe Visentini, Paolo Univ Verona Dipartimento Informat I-37100 Verona Italy Politecn Milan Dipartimento Elettronica Informazione Milan Italy

ISBN: (数字)9783642003189

ISBN: (纸本)9783642003189

In Spatial Data Infrastructures (SDIs) one of the layers that require particular attention in the integration process is the one describing the transport network. Different models can be adopted to represent and manage transport networks data, however, in most cases we have to handle properties that change their value along the road paths, for instance the road width or the number of lanes. This kind of data, usually called "segmented properties" can be represented in different ways, although at conceptual level they can be described as a function from the geometry to a specific domain of values. In this paper we define a conceptual data model for representing "segmented properties" and map it into two implementation approaches: the structural implementation, with explicit geometry representation for each homogeneous segment, and the dynamic implementation, with the implicit representation of the segments by means of a measure (abscissa) on the route path. Then, we propose a method for transferring data from one implementation to the other one and to manage the problems arising from the integration of networks with different geometry and different implementations of segmented properties. Finally, we illustrate the application of the proposed approach to a practical case involving data of the Lombardy Region (Italy).

关键词： Geometry

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Concept for Corporate Information Systems Development Based on GIS Technologies

Concept for Corporate Information Systems Development Based ...

引用

4th International Workshop on Information Fusion and Geographical Information Systems

作者： Popovich, Vasily RAS St Petersburg Inst Informat & Automat St Petersburg 199178 Russia

ISBN: (纸本)9783642003035

This paper covers up-to-date paradigms for the construction of complex information systems - corporate information systems. The concept of the corporate information system used here IS understood as any information system realizing the hierarchic system for decision-making support. The problem of corporate information systems is considered under three angles: theoretical basics, basic technologies, and general architecture. At that, the geoinformation systems technology is selected as the backbone basis. The material is based oil long-term research carried Out in SPIIRAS, in terms of both theory and technology. Many ideas formulated in the paper have already been subjected to practical validation and implementation through international research projects and R&D work for various clients.

关键词： Corporate information system Intelligent GIS Data harmonization Integration and fusion

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Vector Finite Groups as Primitives for Fast Digital Signature Algorithms

Vector Finite Groups as Primitives for Fast Digital Signatur...

引用

4th International Workshop on Information Fusion and Geographical Information Systems

作者： Moldovyan, Nikolay Moldovyan, Andrey Specialized Ctr Program Syst SPECTR St Petersburg 197342 Russia

ISBN: (纸本)9783642003035

Using digital signature (DS) algorithms to perform electronic messages authentication is an issue of significant importance for geographical information systems. The most computationally efficient DS algorithms are based on elliptic curves (EC) over finite fields. However, for many practical applications more efficient DS algorithms are required. To satisfy such performance requirements a new type of the finite groups is proposed as primitive for DS schemes. The elements of the proposed groups are vectors defined over the ground Finite field. The group operation is the vector Multiplication defined with some basis vector multiplication tables the characteristic feature of which is the use of expansion coefficients. It has been shown that the vector groups possess the Multidimension cyclic structure and in special cases the dimension of the cyclicity is mu = 1. In such special cases the vector finite fields (VFFs) are formed. The DS algorithms based on EC over VFFs provides performance significantly higher than the performance of the known EC-based algorithms. Fast DS algorithms based on computations in vector finite groups corresponding to the case mu >= 2 have also been proposed.

关键词： Digital signature Vector finite groups Multidimension cyclicity Vector finite fields Elliptic curves

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Data Harmonization in CIS

Data Harmonization in CIS

引用

4th International Workshop on Information Fusion and Geographical Information Systems

作者： Pankin, Andrey Kuzenny, Viktor RAS St Petersburg Inst Informat & Automat St Petersburg 199178 Russia

ISBN: (纸本)9783642003035

The existing principles of business automation and corporate information systems (CIS) development insufficiently enable the integration of CIS informational subsystems, thus hampering the cooperation of specialists from different departments as well as the acquisition of reliable and complete information. This problem so far lies beyond the range of standard technological Solutions. So, to effectively use the available information and to provide for making the justified managerial decisions, it is necessary to develop a scientifically Sound methodology that would allow for information interaction between the system's heterogeneous components using, therefore, general theoretical approaches to information processing. This paper proposes a solution based on the advanced and best elaborated methodology of data harmonization, integration, and fusion.

关键词： Corporative information systems Data harmonization Data integration Data fusion Business process Common data representation model (CDRM) Dynamic information model (DIM) Common information interactions model (CIIM) Object-oriented approach Ontology

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An Approach to Facilitate the Integration of Hydrological Data by means of Ontologies and Multilingual Thesauri 1

引用

12th Association-of-Geographic-Information-Laboratories-for-Europe (AGILE) Conference/Workshop of the International-Society-of-Photogrammetry-and-Remote-Sensing (ISPRS)

作者： Angel Latre, Miguel Lacasta, Javier Mojica, Eddy Nogueras-Iso, Javier Javier Zarazaga-Soria, Francisco Univ Zaragoza Comp Sci & Syst Engn Dept E-50018 Zaragoza Spain

ISBN: (数字)9783642003189

ISBN: (纸本)9783642003189

The general concern about environmental issues has involved the creation of national and international policies that require, at a technical level, the analysis, merging and processing of data obtained from very different sources. This paper proposes an approach for the integration of hydrological data that is based on the use of a multilingual ontology to facilitate the mapping across the local data models in the different sources. The novelty of the proposal is that the multilingual domain ontology is generated automatically by the merging and pruning of existing lexical ontologies. This approach has been tested in the context of the European Water Framework directive for the development of reporting applications in cross-border scenarios. Nevertheless, this approach could be easily extended to other domains.

关键词： Merging

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Rasterizing Census Geography: Definition and Optimization of a Regular Grid 1

引用

12th Association-of-Geographic-Information-Laboratories-for-Europe (AGILE) Conference/Workshop of the International-Society-of-Photogrammetry-and-Remote-Sensing (ISPRS)

作者： Mathur, Himanshu Bertazzon, Stefania Univ Calgary Dept Geog Calgary AB T2N 1N4 Canada

ISBN: (数字)9783642003189

ISBN: (纸本)9783642003189

The results of first and second order analyses tend to be affected by the characteristics of the spatial units at which data are sampled. This paper discusses the definition of a regular grid superimposed on a set of given irregular census units, and the subsequent redistribution of the census variables to the newly defined grid cells. A statistical criterion guides the definition and optimization of the grid: through an objective function, the method aims at preserving the global spatial autocorrelation measured for a salient variable on the original census units. Several aspects of the grid positioning and population redistribution are critically discussed. Ultimately, the proposed method constitutes a valuable alternative to the spatial heterogeneity that affects many empirical spatial data.

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