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Estimating sea floor dynamics in the southern North Sea to improve bathymetric survey planning / L. Dorst (2009)
Titre : Estimating sea floor dynamics in the southern North Sea to improve bathymetric survey planning Type de document : Thèse/HDR Auteurs : L. Dorst, Auteur Editeur : Delft : Netherlands Geodetic Commission NGC Année de publication : 2009 Collection : Netherlands Geodetic Commission Publications on Geodesy, ISSN 0165-1706 num. 69 Importance : 220 p. Format : 17 x 24 cm ISBN/ISSN/EAN : 978-90-6132-311-2 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bathymétrie
[Termes IGN] bathymétrie
[Termes IGN] covariance
[Termes IGN] déformation de la croute terrestre
[Termes IGN] fond marin
[Termes IGN] géodynamique
[Termes IGN] géostatistique
[Termes IGN] interpolation
[Termes IGN] krigeage
[Termes IGN] marée océanique
[Termes IGN] morphogenèse
[Termes IGN] nivellement indirect
[Termes IGN] Nord, mer du
[Termes IGN] océanographie dynamique
[Termes IGN] port
[Termes IGN] relèvement
[Termes IGN] Rotterdam (Pays-Bas)
[Termes IGN] sable
[Termes IGN] vagueIndex. décimale : 32.10 Bathymétrie Résumé : (Auteur) Safe nautical charts require a carefully designed bathymetric survey policy, especially in shallow sandy seas that potentially have dynamic sea floor patterns. Bathymetric resurveying at sea is a costly process with limited resources, though. A pattern on the sea floor known as tidal sand waves is clearly present in bathymetric surveys, endangering navigation in the Southern North Sea because of the potential dynamics of this pattern. An important factor in an efficient resurvey policy is the type and size of sea floor dynamics. The uncertainties of measurement and interpolation associated with the depth values enable the statistical processing of a time series of surveys, using deformation analysis. Currently, there is no procedure available that satisfies the Royal Netherlands Navy requirements. Therefore, a deformation analysis procedure is designed, implemented and tested in such a way that the procedure works on bathymetric data and satisfies the Royal Netherlands Navy requirements. Also, it is necessary to develop a procedure that translates the results into changes of the resurvey policy, taking into account their confidence intervals.
To describe the sea floor statistically, we assume the sea floor to consist of a spatial trend function (or characterization) and a residual function (or dispersion). Such a description is called a representation. The covariances between positions are expressed in a covariance function, based on the residual function. The covariance function is used by Kriging, an interpolation procedure that propagates the variances and covariances of the data points to variances of the interpolated values. This approach is used widely for spatial analyses, like the interpolation of a bathymetric data set.
The method that we propose uses Kriging to produce a time series of grids of depth values and their variances. Subsequently, it uses deformation analysis, a statistical procedure based on testing theory. Our application of deformation analysis is particularly aimed at the detection of dynamics in areas with tidal sand waves, resulting in parameter estimates for the sea floor dynamics, and their uncertainty. We apply the method to sea floor representations both with and without a sand wave pattern. A test scenario is set up, consisting of a survey of an existing area in the Southern North Sea, for which dynamics are simulated. The results show that the proposed method detects different types of sea floor dynamics well, leading to satisfactory estimates of the corresponding parameters.
We show results for the anchorage area Maas West near the Port of Rotterdam, the Netherlands first. The area is divided into 18 sub-areas. The results show that a sand wave pattern is detected for most of the sub-areas, and a shore-ward migration is detected for a majority of them. The estimated migration rates of the sand waves are up to 7.5 m/yr, with a 95% confidence interval that depends on the regularity of the pattern. The results are in confirmation with previously observed migration rates for the Southern North Sea, and with an idealized process-based model.
Thereafter, we analyze several other areas for which a time series of surveys is available in the bathymetric, archives of the Netherlands Hydrographic Service, to study the spatial variations in sea floor dynamics. We present results for several sand wave areas and a single flat area. In some of those areas, dredging takes place, to guarantee minimum depths. The results indicate sand wave migration in areas close to the coast, and bed level changes of the order of decimeters. The dominant wavelength of the sand waves varies. We compare our results to literature of the same sand wave areas, in which we find similar migration rates, and different wavelengths.
By formulating four indicators, recommendations are made for the resurvey policy on the Belgian and Netherlands Continental Shelf. These indicators follow from the estimates for sea floor dynamics. We present a concept for the shallowest likely depth surface, on which we base two of the indicators. The other two indicators act as a warning: they quantify the potentially missed dynamics, which makes the procedure more robust in case of complicated morphology. We show clear differences in recommended resurvey frequency between the five analyzed regions.
We conclude that the designed method is able to use a time series of bathy-metric surveys for the estimation of sea floor dynamics in a satisfactory way. Those dynamics may be present on the scale of the sea floor, it may be a local effect, or it may be due to a tidal sand wave pattern. Also, the results are successfully reduced to a set of four indicators, used to improve a resurvey policy. Based on these conclusions, we formulate recommendations on the extrapolation of the results in space and time, on potential adaptations to the designed procedure, and on implementation of the procedure.Note de contenu : Preface
1 Introduction
1.1 Nautical charting
1.2 Survey plan design
1.3 Detection of sea floor dynamics
1.4 Tidal sand waves
1.5 The uncertainty of depth measurements
1.6 Problem formulation
1.7 Research question and subquestions
1.8 Research strategy and outline
2 Bathymetric applications of Geostatistics
2.1 Introduction
2.2 Depth as a trend and its residuals
2.3 Covariance functions
2.4 Kriging
2.5 Conclusion
3 Estimating sea floor dynamics
3.1 Introduction
3.2 The method for the estimation of sea floor dynamics
3.3 Specification of a test scenario
3.4 Analysis results of a dynamic sea floor
3.5 Discussion
3.6 Conclusion
3.A Error characteristics
3.B Transformation of the sand wave parameters
3.C The application of statistical estimation and testing
4 The analysis of migrating tidal sand waves
4.1 Introduction
4.2 The application of deformation analysis
4.3 Results of the deformation analysis
4.4 Discussion of results
4.5 Conclusion
4.A Overview of used surveys
4.B Quantification of measurement errors
4.B.1 Covariance function of the error
4.B.2 Variances of the SEES surveys
4.B.3 Variances of the MBES survey
5 Spatial variations in sea floor dynamics
5.1 Introduction
5.2 Deformation analysis
5.3 The Selected Track region: little dynamics
5.4 The Noordhinder region: comparison with other methods
5.5 The region West of IJmuiden: sand wave migration
5.6 The region North of Terschelling: a flat sea floor
5.7 Discussion
5.8 Conclusion
5.A Overview of used surveys
6 Application to the resurvey policy
6.1 Introduction
6.2 Background: Hydrographic practice
6.3 Method: indicators of sea floor dynamicsNuméro de notice : 15495 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère DOI : sans En ligne : https://www.ncgeo.nl/downloads/69Dorst.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62737 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15495-01 32.10 Livre Centre de documentation Topographie Disponible
Titre : SDI convergence : research, emerging trends, and critical assessment Type de document : Monographie Auteurs : Bastiaan Van Loenen, Éditeur scientifique ; J. Besemer, Éditeur scientifique ; Jaap Zevenbergen, Éditeur scientifique Editeur : Delft : Netherlands Geodetic Commission NGC Année de publication : 2009 Collection : Netherlands Geodetic Commission Green series num. 48 Importance : 279 p. Format : 17 x 24 cm ISBN/ISSN/EAN : 978-90-6132-310-5 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] atlas national
[Termes IGN] atlas numérique
[Termes IGN] collectivité territoriale
[Termes IGN] couverture (données géographiques)
[Termes IGN] données localisées
[Termes IGN] économie de l'information géographique
[Termes IGN] information géographique numérique
[Termes IGN] infrastructure mondiale des données localisées
[Termes IGN] infrastructure nationale des données localisées
[Termes IGN] INSPIRE
[Termes IGN] Italie
[Termes IGN] métadonnées
[Termes IGN] Pays-Bas
[Termes IGN] représentation continue
[Termes IGN] Sardaigne
[Termes IGN] service fondé sur la position
[Termes IGN] service web géographique
[Termes IGN] Victoria (Australie)
[Termes IGN] web sémantiqueRésumé : (Auteur) [avant-propos] This book is the result of a collaborative initiative of the Global Spatial Data Infrastructure Association (GSDI), the European Commission's Joint Research Centre, the European umbrella organisation for geographic information (EUROGI), the Dutch innovation program Space for Geo-Information (RGI) and Geonovum, the Netherlands SDI executive committee. In addition to the traditional call for papers for the joint GSDI-11/ INSPIRE/ Geonovum RGI conference 'Spatial Data Infrastructure Convergence: Building SDI Bridges to Address Global Challenges' contributions of full articles were solicited for publication in this peer reviewed volume. In several instances, the articles submitted addressed the theme of the conference. In others they stuck to the more traditional fields of SDI. The reviewing process resulted in twenty articles that together can be summarised as Spatial Data Infrastructure Convergence: Research, Emerging Trends, and Critical Assessment. These topics are represented well in this volume. Note de contenu : - Peer Review Board for SDI Convergence: Research, Emerging Trends, and Critical Assessment
- Spatial Data Infrastructure Convergence / B. van Loenen, J. Besemer and J. Zevenbergen
- The Potential of a National Atlas as Integral Part of the Spatial Data Infrastructure Exemplified by the New
Dutch National Atlas / M-J. Kraak, F. Ormeling, B. Kb'bben and T. Aditya
- Development and Deployment of a Services Catalog in Compliance with the INSPIRE Metadata Implementing Rules / J. Nogueras-lso, J. Barrera, A.F. Rodriguez, R. Recio, C. Laborda and F.J. Zarazaga-Soria
- Public Sector Geo Web Services: Which Business Model Will Pay for a Free Lunch? / F. Welle Donker
- Standard Licences for Geographic Information: the Development and Implementation in Local Government in Italy / L. Garretti, S. Griffa, R. Luca and M.T. Lopreiato
- Legal Simcity; Legislative Maps and Semantic Web Supporting Conflict Resolution / R. Peters, R. Hoekstra, T. van Engers and E. Hupkes
- Power and Privacy: the Use of LBS in Dutch Public Administration / C. van Ooijen and S. Nouwt
- Harmonising and Integrating Two Domain Models Topography / J. Stoter, W. Quak and A. Hofman
- An Analysis of Technology Choices for Data Grids in a Spatial Data Infrastructure / S. Coetzee and J. Bishop
- SDI and Metadata Entry and Updating Tools / A. Rajabifard, M. Kalantari and A. Binns
- A Prototype Metadata Tool for Land Use Change and Impact Models -a Case Study in Regional Victoria, Australia / S. Williams, C. Pettit, D. Hunter and D. Cherry
- Implementation of Recent Metadata Directives and Guidelines in Public Administration: the Experience of Sardinia Region / L. Manigas, M. Beneventi, L. Corvette, R. Vinelli and M. Melis
- An Integrated Framework for the Implementation and Continuous Improvement of Spatial Data Infrastructures / A. Toomanian and A. Mansourian
- The Value Chain Approach to Evaluate the Economic Impact of Geographic Information: Towards a New Visual Tool / E. Genovese, S. Roche and C. Caron
- Evaluation of Spatial Information Technology Applications for Mega City Management / S. Boos and H. Mueller
- Local Government and SDI - Understanding their Capacity to Share Data / K. McDougall, A. Rajabifard and I. Williamson
- Changing Notions of a Spatial Data Infrastructure / I. Masser
- Cooperation - a Key Factor for Sustainable Spatial Data Infrastructure / O. Olsson
- Seamless SDI Model - Bridging the Gap between Land and Marine Environments / S. Vaez, A. Rajabifard and I. Williamson
- The RRR Toolbox: a Conceptual Model for Improving Spatial Data Management in SDIs / R. Bennett and A. Rajabifard
- Building SDI Bridges for Catchment Management / D. Raj Paudyal, K. McDougall and A. ApanNuméro de notice : 10832 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Recueil / ouvrage collectif En ligne : https://www.ncgeo.nl/index.php/en/publicatiesgb/green-series/item/2367-gs-48-b-v [...] Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=39866 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 10832-01 37.00 Livre Centre de documentation Géomatique Disponible 10832-02 37.00 Livre Centre de documentation Géomatique Disponible Documents numériques
en open access
SDI convergence - pdf éditeurAdobe Acrobat PDF Aspects of generating precise digital terrain models in the Wadden Sea from lidar-water classification and structure line extraction / A. Brzank in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 5 (September - October 2008)
[article]
Titre : Aspects of generating precise digital terrain models in the Wadden Sea from lidar-water classification and structure line extraction Type de document : Article/Communication Auteurs : A. Brzank, Auteur ; Christian Heipke, Auteur ; J. Goepfert, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 510 - 528 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] données lidar
[Termes IGN] extraction de traits caractéristiques
[Termes IGN] lasergrammétrie
[Termes IGN] littoral
[Termes IGN] modèle numérique de terrain
[Termes IGN] Pays-Bas
[Termes IGN] semis de points
[Termes IGN] Wadden, mer desRésumé : (Auteur) The Wadden Sea is a unique habitat formed by the strong influence of tidal currents. Twice a day the area is flooded and falls dry afterwards. Due to the force of tidal streams, strong morphologic changes occur frequently. In order to monitor these changes, high precision digital terrain models (DTMs) are required. Lidar proved to be an adequate technique to deliver highly accurate 3D mass points of the surface and dense spacing. However, water often remains within tidal channels and depressions even at low tide, and near infrared lidar is not able to penetrate the water leading to a point cloud which contains surface and water points. Thus, the standard processing workflow for DTM generation from lidar is not suited for the Wadden Sea. In this article, a new workflow is proposed for DTM generation from lidar data in the Wadden Sea. Two major building blocks of this workflow, namely classification of the water points and structure line detection, are presented in detail. For both tasks suitable algorithms were developed tailored to meet special requirements of mudflat. Lidar measurements from water surfaces are detected by a supervised fuzzy classification using the features height, intensity, and 2D point density. Structure lines are derived through a piecewise reconstruction of the surface from the lidar data with a hyperbolic tangent function. The obtained results show that both methods considerably improve the accuracy of DTMs from lidar data. Copyright ISPRS Numéro de notice : A2008-386 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2008.02.002 En ligne : https://doi.org/10.1016/j.isprsjprs.2008.02.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29379
in ISPRS Journal of photogrammetry and remote sensing > vol 63 n° 5 (September - October 2008) . - pp 510 - 528[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-08051 SL Revue Centre de documentation Revues en salle Disponible Strong road safety policy / E. Donkers in Geoinformatics, vol 11 n° 6 (01/09/2008)
[article]
Titre : Strong road safety policy Type de document : Article/Communication Auteurs : E. Donkers, Auteur ; H. Coppen, Auteur Année de publication : 2008 Article en page(s) : pp 60 - 63 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] accident de la route
[Termes IGN] analyse spatiale
[Termes IGN] base de données routières
[Termes IGN] diffusion par internet
[Termes IGN] Pays-Bas
[Termes IGN] prévention des risques
[Termes IGN] sécurité routière
[Termes IGN] système d'information géographiqueRésumé : (Auteur) Increasing road mobility has led to an increase in unsafe traffic operations. To reduce the number of road victims, a 'crash database' was developed in the early 1970s in the Netherlands. Eventually, this database proved its value as is now the basis for performing crash analysis through a GIS, provided by the TatukGIS Internet Server. Dutch-based viastat employs specialists in monitoring and analysing road safety data. CEO Erik Donkers and Chief Information Officer Hugo Coppen explain how this database came into being and how it is now used in combination with GIS applicationss and through the web. Copyright GEOinformatics Numéro de notice : A2008-345 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29338
in Geoinformatics > vol 11 n° 6 (01/09/2008) . - pp 60 - 63[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 262-08061 SL Revue Centre de documentation Revues en salle Disponible A data-driven approach to local gravity field modelling using spherical radial basis functions / R. Klees in Journal of geodesy, vol 82 n° 8 (August 2008)
[article]
Titre : A data-driven approach to local gravity field modelling using spherical radial basis functions Type de document : Article/Communication Auteurs : R. Klees, Auteur ; Robert Tenzer, Auteur ; I. Prutkin, Auteur ; Tobias Wittwer, Auteur Année de publication : 2008 Article en page(s) : pp 457 - 471 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] anomalie de pesanteur
[Termes IGN] champ de pesanteur local
[Termes IGN] fonction de base radiale
[Termes IGN] hauteur ellipsoïdale
[Termes IGN] nivellement par GPS
[Termes IGN] Pays-Bas
[Termes IGN] problème des valeurs limitesRésumé : (Auteur) We propose a methodology for local gravity field modelling from gravity data using spherical radial basis functions. The methodology comprises two steps: in step 1, gravity data (gravity anomalies and/or gravity disturbances) are used to estimate the disturbing potential using least-squares techniques. The latter is represented as a linear combination of spherical radial basis functions (SRBFs). A data-adaptive strategy is used to select the optimal number, location, and depths of the SRBFs using generalized cross validation. Variance component estimation is used to determine the optimal regularization parameter and to properly weight the different data sets. In the second step, the gravimetric height anomalies are combined with observed differences between global positioning system (GPS) ellipsoidal heights and normal heights. The data combination is written as the solution of a Cauchy boundary-value problem for the Laplace equation. This allows removal of the non-uniqueness of the problem of local gravity field modelling from terrestrial gravity data. At the same time, existing systematic distortions in the gravimetric and geometric height anomalies are also absorbed into the combination. The approach is used to compute a height reference surface for the Netherlands. The solution is compared with NLGEO2004, the official Dutch height reference surface, which has been computed using the same data but a Stokes-based approach with kernel modification and a geometric six-parameter “corrector surface” to fit the gravimetric solution to the GPS-levelling points. A direct comparison of both height reference surfaces shows an RMS difference of 0.6 cm; the maximum difference is 2.1 cm. A test at independent GPS-levelling control points, confirms that our solution is in no way inferior to NLGEO2004. Copyright Springer Numéro de notice : A2008-319 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-007-0196-3 En ligne : https://doi.org/10.1007/s00190-007-0196-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29312
in Journal of geodesy > vol 82 n° 8 (August 2008) . - pp 457 - 471[article]Réservation
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