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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181-190 订阅

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Retrieving of GNSS Tropospheric Delays from RTKLIB in Real-Time and Post-processing Mode

Retrieving of GNSS Tropospheric Delays from RTKLIB in Real-T...

引用

GIS Ostrava Conference

作者： Kacmarik, Michal VSB Tech Univ Ostrava Inst Geoinformat 17 Listopadu 15 Ostrava 70833 Czech Republic

ISBN: (纸本)9783319612973;9783319612966

Global Navigation Satellite Systems (GNSS) allow a precise estimation of atmospheric water vapour what is successfully used in weather forecasting, namely in Numerical Weather Prediction (NWP) models. In this study the quality of real-time and post-processed zenith total delay (ZTD) values from GPS (Global Positioning System) Precise Point Positioning (PPP) technique processing is investigated. GPS observations from a month-long period and eight European stations were processed in RTKLIB program package. Two versions of real-time processing solutions using different real-time IGS (International Global Navigation Satellite Systems Service) products (IGS01, IGS03) and two versions of post-processed solutions using different strategies were evaluated. Obtained ZTDs were compared with the final IGS ZTD product. The mean RMSE (root-mean-square error) was 10.3 mm for real-time solution based on the IGS03 real-time product and 12.2 mm for the other solution based on the IGS01 product. Both post-processed solutions reached a mean RMSE of about 5 mm. The better real-time ZTD solution from RTKLIB using IGS03 product was therefore close to the 10 mm value defined as a target ZTD accuracy necessary for their usage in NWP models and nowcasting applications in meteorology.

关键词： GNSS meteorology Real-time Precise Point Positioning Zenith total delay RTKLIB

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Representing Buildings for Visibility Analyses in Urban Spaces

Representing Buildings for Visibility Analyses in Urban Spac...

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GIS Ostrava Conference

作者： Caha, Jan Mendel Univ Brno Dept Reg Dev & Publ Adm Fac Reg Dev & Int Studies Zemedelska 1 Brno 61300 Czech Republic

ISBN: (纸本)9783319612973;9783319612966

The availability of detailed and precise digital surface models based on LiDaR data allows accurate calculation of visibility analysis even in urban areas. Lately, the viewshed analysis, which is implemented in geographical information systems, is often used to determine the visibility of buildings or other structures in both natural and urban environments. Such utilization of viewshed tool, which is originally designed to assess visibility from point to its neighbourhood, however, brings issues regarding partial visibility of the target that are usually neglected. The core of the problem here is that the target building is often represented as a single point in the viewshed analysis. This simplification can lead to an incorrect assessment of the visibility as the specific point of the building can be invisible for the observer while other parts of the building are visible. To properly analyse visibility of a building it is necessary to consider partial visibility of the target. To allow the assessment of partial visibility more than one point that represents the building needs to be defined. In this contribution, the theoretical aspects of reverse viewshed, an area from which a target point is visible, are considered with a focus on the proper representation of target building in the reverse visibility analysis. A practical study of building visibility is conducted with the building represented as single and multiple points. The results are compared and the differences are explored.

关键词： Viewshed Reverse viewshed Visibility Digital surface model

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Automatic Detection and Monitoring of Cyanobacterial Blooms in the Context of the Marine Cadastre

Automatic Detection and Monitoring of Cyanobacterial Blooms ...

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GIS Ostrava Conference

作者： Dawidowicz, Agnieszka Kulawiak, Marcin Bruniecki, Krzysztof Ogryzek, Marek Univ Warmia & Mazury Dept Real Estate Resources Fac Geodesy Geospatial & Civil Engn Prawochenskiego St 15 PL-10720 Olsztyn Poland Gdansk Univ Technol Dept Geoinformat Fac Elect Telecommun & Informat Gabriela Narutowicza St 11-12 PL-80233 Gdansk Poland Univ Warmia & Mazury Fac Geodesy Geospatial & Civil Engn Dept Planning & Spatial Engn Prawochenskiego St 15 PL-10720 Olsztyn Poland

ISBN: (纸本)9783319612973;9783319612966

In the wake of the European and global spatial data infrastructures (SDI) it is important to build information systems which use and serve thematic data in compliance with the INSPIRE Directive. In the context of hydrographic data, the Directive requires EU member states to collect and share information on maritime areas divided into regions and sub-regions, as well as coastal zone management areas. These data are part of recently developed marine cadastres. According to the INSPIRE Directive the marine cadastres should be supplemented with information on the physical condition of the seas as well as on the specific natural characteristics and phenomena occurring in the seas. The latter can include dynamic information on marine pollution such as cyanobacterial blooms. The paper presents the concept of dynamic satellite-based cyanobacteria bloom detection for the purpose of its analysis in the context of marine cadastre.

关键词： Marine cadastre SDI Cyanobacteria AVHRR Geovisual analytics

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New Approach to Import 3D Geodata for Remcom Wireless Insite

New Approach to Import 3D Geodata for Remcom Wireless Insite

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GIS Ostrava Conference

作者： Ruzicka, Jan Michalek, Libor Ruzickova, Katerina VSB Tech Univ Ostrava Inst Geoinformat Fac Min & Geol 17 Listopadu 15 Ostrava 70833 Czech Republic VSB Tech Univ Ostrava Fac Elect Engn & Comp Sci Dept Telecommun 17 Listopadu 15 Ostrava 70833 Czech Republic

ISBN: (纸本)9783319612973;9783319612966

The paper is focused on developing a new approach how automatically process 3D geospatial data for Remcom Wireless InSite. Remcom Wireless InSite is a software tool which provides efficient and accurate predictions of an electromagnetic waves propagation and a communication channel characteristics in complex urban, indoor, rural and mixed path environments. The Wireless InSite is able to import a 3D geospatial model, that consists of a DTM (Digital Terrain Model) and objects (buildings). To be able to perform any predictions, we need to import different geodata objects into Wireless InSite and run calculations in an automated way. We tested several available functions for importing geodata to Wireless InSite. All of them have some drawbacks that made us do free import/export tool that reads data from 3D GIS (Geographic Information System) database and exports them to the form that can be directly read by Wireless InSite. The main advantage of this approach is complete control over the import and export processes. For example, we can specify the LOD (Level of Detail) for import, or we can specify for each different object the type of material.

关键词： Remcom Wireless InSite 3D geodata DTM Propagation Import Export

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Towards a Dynamic Isochrone Map: Adding Spatiotemporal Traffic and Population Data 14th

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14th International Conference on Location Based Services

作者： van den Berg, Joris Kobben, Barend van der Drift, Sander Wismans, Luc UU Fac Geosci Utrecht Netherlands Univ Twente ITC Fac Geoinformat Sci & Earth Observat Enschede Netherlands DAT Mobil Deventer Netherlands Univ Twente CTS Engn Technol Fac Enschede Netherlands

ISBN: (纸本)9783319714707;9783319714691

This research combines spatiotemporal traffic and population distribution data in a dynamic isochrone map. To analyze the number of people who have access to a given area or location within a given time, two spatiotemporal variations should ideally be taken into account: (1) variation in travel time, which tend to differ throughout the day as a result of changing traffic conditions, and (2) variation in the location of people, as a result of travel. Typically, accessibility research includes neither one or only variation in travel time. Until recently, we lacked insight in where people were located throughout the day. However, as a result of new data sources like GSM data, the opportunity arises to investigate how variation in traffic conditions and variation in people's location influences accessibility through space and time. The novelty of this research lies in the combination of spatiotemporal traffic data and spatiotemporal population distribution data presented in a dynamic isochrone web map. A case study is used for the development of this isochrone map. Users can dynamically analyze the areas and people who can reach various home interior stores in the Netherlands within a given time, taking into account traffic conditions and the location of people throughout the day.

关键词： Isochrone map Dynamic Spatiotemporal Traffic Population distribution GSM Accessibility

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Captcha Your Location Proof-A Novel Method for Passive Location Proofs in Adversarial Environments 14th

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14th International Conference on Location Based Services

作者： Bucher, Dominik Rudi, David Buffat, Rene Swiss Fed Inst Technol Inst Cartog & Geoinformat Stefano Franscini Pl 5 CH-8093 Zurich Switzerland

ISBN: (纸本)9783319714707;9783319714691

A large number of online rating and review platforms allow users to exchange their experiences with products and locations. These platforms need to implement appropriate mechanisms to counter malicious content, such as contributions which aim at either wrongly accrediting or discrediting some product or location. For ratings and reviews of locations, the aim of such a mechanism is to ensure that a user actually was at said location, and did not simply post a review from another, arbitrary location. Existing solutions usually require a costly infrastructure, need proof witnesses to be co-located with users, or suggest schemes such as users taking pictures of themselves at the location of interest. This paper introduces a method for location proofs based on visual features and image recognition, which is cheap to implement yet provides a high degree of security and tamper-resistance without placing a large burden on the user.

关键词： Location

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Multidimensional Evaluation of Public Transport Accessibility

Multidimensional Evaluation of Public Transport Accessibilit...

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GIS Ostrava Conference

作者： Horak, Jiri Ivan, Igor Vozenilek, Vit Tesla, Jan VSB Tech Univ Ostrava Fac Min & Geol Inst Geoinformat 17 Listopadu 15-2172 Ostrava 70833 Czech Republic Palacky Univ Fac Sci Dept Geoinformat 17 Listopadu 50 Olomouc 77146 Czech Republic

ISBN: (纸本)9783319612973;9783319612966

Public transport conditions are analysed using simulated commuting to important employers and recording data about significant features of all simulated trips. Two forms of overall public transport accessibility evaluation are comparedrule based and multivariate based classifications. Rule based classification was developed in several variants integrating two or four indicators, average and non-aggregated values. More valuable results were obtained using extended set of indicators for non-aggregated trips. The multivariate classification utilizes a novel approach to K-means cluster analysis using decile values. The comparison of both classifications shows a primary role of expert based classification. K-means cluster analysis based on deciles or median values are suitable for establishing more common typology but not for a local accessibility evaluation.

关键词： Accessibility Public transport Multidimensional evaluation K-means Multicriteria evaluation Spatial simulation

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Risk Management as a Stimulus for a Settlement and Landscape Transformation? Soil Erosion Threat Assessment in the Fields of Four Deserted Villages Based on LiDAR-Derived DEMs and 'USLE'

Risk Management as a Stimulus for a Settlement and Landscape...

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GIS Ostrava Conference

作者： Holata, Lukas Kapicka, Jiri Svetlik, Radek Zizala, Daniel Univ Exeter Dept Archaeol Laver BldgNorth Pk RdStreatham Campus Exeter EX4 4QE Devon England Res Inst Soil & Water Conservat Zabovreska 250 Prague 15627 5 Czech Republic Gulag Cz Zs Dolinach 524-40 Prague 14700 4 Czech Republic

ISBN: (纸本)9783319612973;9783319612966

This paper draws attention to the dynamics beyond the shaping of historical landscape and deals with the settlement abandonment and landscape transformation during the Later Middle Ages. Despite long-lasting debate about the reasons of this process, explicit explanation is still missing. Among others, ecological issues, including soil erosion, have been frequently mentioned, although not always supported by data. We examine four deserted villages in the Czech Republic - Bzik and Kamenice in Pilsner region (Bohemia) and Bouchenec and Novosice in the Drahany Uplands (Moravia). Their remains have been preserved in woodlands and, therefore, the extent of medieval ploughlands could be reconstructed. LiDAR-derived DEMs and Universal Soil Loss Equation (USLE) have been applied to assess the soil erosion threat of the village fields. The results of the modelling indicate a high erosion threat for the majority of fields. This factor, together with resulting soil degradation, can be considered as a reason for the abandonment and subsequent landscape transformation.

关键词： Landscape archaeology Settlement abandonment Landscape transformation Water erosion Middle Ages

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Floreon⁺: A Web-Based Platform for Flood Prediction, Hydrologic Modelling and Dynamic Data Analysis

Floreon<SUP>+</SUP>: A Web-Based Platform for Flood Predicti...

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GIS Ostrava Conference

作者： Svaton, Vaclav Podhoranyi, Michal Vavrik, Radim Veteska, Patrik Szturcova, Daniela Vojtek, David Martinovic, Jan Vondrak, Vit VSB Tech Univ Ostrava Natl Supercomp Ctr IT4Innovat 17 Listopadu 15-2172 Ostrava 70833 Czech Republic VSB Tech Univ Ostrava Inst Geoinformat Fac Min & Geol 17 Listopadu 15 Ostrava 70833 Czech Republic

ISBN: (纸本)9783319612973;9783319612966

The main goal of this article is to describe the overview of Floreon(+) system, an online flood monitoring and prediction system, which was primarily developed for the Moravian-Silesian region in the Czech Republic. Moreover, the article specifies the basic processes, which are implemented for running automatic and on-demand simulations that utilize the High Performance Computing (HPC) infrastructure. The main purpose of hydrodynamic models in the disaster management context is to provide an accurate overview of hydrologic situation in a given river catchment. In the event of extreme weather conditions, such as unusually heavy rainfall, these models could provide valuable information about imminent flood risk endangering a particular area. In the disaster management context, time plays a very significant role. Up to date and accurate results obtained in a short time can be very helpful. The availability of such results can be significantly improved by utilization of HPC resources and tools. The article describes the individual parts of the system in terms of data types, dynamic data processing, visualization, and the overall architecture.

关键词： Floreon(+) Hydromodelling Geovisualization High performance computing Dynamic data

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An Overall Framework for Personalised Landmark Selection 14th

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14th International Conference on Location Based Services

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

ISBN: (纸本)9783319714707;9783319714691

This paper proposes a multidimensional model for the selection of personalized landmarks. The model is based on an existing landmark salience model, which was designed to be open to adaptations regarding individual user preferences. The conventional model is based solely on landmark dimensions (i.e. visual, semantic and structural dimension). We add an additional personal dimension to account for different familiarities and interests. Further, we add an environmental dimension to accommodate different routing situations and a descriptive dimension to consider the brevity of a landmark description. In this paper we identify the attributes of the dimensions of the multidimensional model and investigate methods for calculating the salience of the attributes. The applicability and usefulness of the (still evolving) model is shown with three different case studies.

关键词： Semantics

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