Descripteur
Documents disponibles dans cette catégorie (841)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
Remote sensing in the 21st century : economic and environmental applications / José Luis Casanova (2000)
Titre : Remote sensing in the 21st century : economic and environmental applications : Proceedings of the 19th Earsel Symposium on remote sensing in the 21st century, Valladolid, Spain, 31 May - 2 June 1999 Type de document : Actes de congrès Auteurs : José Luis Casanova, Éditeur scientifique Editeur : Lisse et Amsterdam : Balkema (August Aimé) Année de publication : 2000 Conférence : EARSeL 1999, 19th symposium, Remote sensing in the 21st century : economic and environmental applications 31/05/1999 02/06/1999 Valladolid Espagne Importance : 610 p. Format : 18 x 26 cm ISBN/ISSN/EAN : 978-90-5809-096-6 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] agriculture
[Termes IGN] éclairement énergétique
[Termes IGN] géologie
[Termes IGN] image radar
[Termes IGN] image radar moirée
[Termes IGN] image satellite
[Termes IGN] incendie de forêt
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] irrigation
[Termes IGN] météorologie
[Termes IGN] Normalized Difference Vegetation Index
[Termes IGN] océanographie spatiale
[Termes IGN] radar à antenne synthétique
[Termes IGN] restauration d'image
[Termes IGN] risque naturel
[Termes IGN] ruissellement
[Termes IGN] sylviculture
[Termes IGN] télédétection en hyperfréquence
[Termes IGN] turbulence
[Termes IGN] utilisation du sol
[Termes IGN] zone humideNote de contenu : KEYNOTE LECTURES
- The future ESA Earth-Observation Strategy and ESA's 'Living Planet' programme by D.J. Southwood
- The Council of Europe's EUR-OPA Major Hazards Agreement by J.P. Massué & C. Negru
1. AGRICULTURE AND FORESTRY
- Space-vegetation software: A remote sensing tool for environmental applications at regional level by C Carmona-Moreno, J -A Moreno-Ruiz, E Bartholome & T. Negre
- Unsupervised classification's optimization by C. Pinilla, F.J. Ariza & M. Sanchez de la Orden
- A methodological approach for agricultural statistics by remote sensing by D. Yousfi
- The role of TM thermal band in describing the state/stress of vegetation by S.K.A. Panah & R. Goossens
- Drought monitoring of Spanish forests using Landsat TM satellite images by A. Vazquez, J M Cuevas, F. Gonzalez-Alonso, A Calle & J L Casanova
- Monitoring of forest change by using multi-temporal satellite data by N. Musaoglu & C Ormeci
- Integration of NOAA-AVHRR and meteorological data in a GIS - Application for vegetation monitoring in Castilla y Leon, Spain by P. Illera, J.A. Delgado, A.F. Unzueta & A.A.F. Manso
- Crop spatial characterization in the 18th aquifer, Spain by J. Garcia-Consuegra, F. Abad & G. Cisneros
- The use of satellite remote sensing imagery for detection of secondary forests on post-agricultural soils : A case study of Tuchola Forest, Northern Poland by M Kunz, A Nienartowicz & M Deptula
- The application of aerial photographs for analysis of landscape diversity in Reserve Grzedy, Biebrza National Park, Poland by M. Falencka-Jablonska, M Kunz &A Nienartowicz
- Drought monitoring based on thermal and microwave satellite data by K Dabrowska-Zielinska, A Ciolkosz, M Gruszczynska, W. Kowalik & E Kogan
- Irrigated crop identification and surface estimation with Landsat TM imagery in La Mancha oriental region, Spain by C. M Beltran, A C. Belmonte, JR. R. Gallardo & J. S. Garcia
- The integration of satellite images and GIS for Omerli Water Basin land use changes by C. Goksel & H. Turkoglu
- Geographical analysis using GIS of agrarian land use in the Province of Valladolid in 1997 with own classification on multiband satellite images by F.J. Tapiador & J. L Casanova
- Application of remote sensing to the study of oak decline in Aragon, Spain by S. Ait-Bachir, E G. Pelegrin & B. Lacaze
- Modelisation of the NDVI temporal evolution in forestry of Castilla y Leon Spain using climatic data by A.A.F. Manso, P. Illera, J.A. Delgado & A E Unzueta
2. METEOROLOGY
- Consequences of spatial resolution transformations for land-use classification by U. Fehrenbach & D. Scherer
- Validation of cloud detection algorithms by E Sospedra, V. Caselles, C. di Bella, C Coll, E Valor & E Rubio
- Measurements of C02 fluxes in Central Spain using the eddy correlation technique: Preliminary results by M.L. Sanchez, R. Rodriguez, S. Martinez, M Ozores & M.J. Lopez
- Selecting a clear-sky model to accurately map solar radiation from satellite images by G. Rigollier & L. Wald
- Radiative Bowen ratio to estimate daily fluxes from satellite images by M. Ibanez, V. Caselles & R Pérez
- Investigation of surface characteristics by the synergy of ground observations and NOAA/ AVHRR satellite measurements by J. Kerenyi, A. Merza, G. Gutman &L Csiszar
- Meteorological radar data processing software by D.D. Rancic, M.S. Smiljanic, S. Djordjevic-Kajan, P M Eferica, P D. Vukovic & A T Kostic
- Evaluation and behavior of the aerosol c Angstrom coefficient from spectral solar irradiance measurements in the Gulf of Cadiz (Huelva, Spain) to assess ocean color atmospheric correction by V E. Cachorro, R. Vergaz, A & A M De Frutos
- Calculation and analysis of erythematic irradiance using experimental data and TOMS ozone data by A Calle, A M Perez & J L Casanova
3. HYDROLOGY
- Wetland monitoring by the integration of remotely sensed data in a GIS tool by S. Castano, M.E. Mejuto, A. Vela & A. Quintanilla
- The use of Earth Observation for monitoring snowmelt runoff from non-alpine basins by R.G. Caves, O.C. Turpin, G.D. Clark, R.L Ferguson, S. Quegan & B. Johansson
- Three years of mapping irrigation water in the Flumen irrigation district, Spain by T. Martin-Ordonez, Ma.A Casterad & J Herrero
- Satellite monitoring in Amudarya river basin hydrology by V.E. Chub
- Application of mathematical functions for the monitoring of the small water bodies by V.E. Chub, N E. Gorelkin & S.V. Myagkov
4. METHODOLOGY
- Generation and integration of thematic documents from satellite images and ground sensors for environmental analysis and management by S. Ormeno & L Molina
- Accurate geodetic positioning of satellite laser ranging stations using a short arc geometric solution by M Catalan-M P Villares & M Catalan-PU
- Remote sensed image rectification in an automatic way by A. Martinez, F.J. Abad & J D. Garcia-Consuegra
- Architecture of a new generation of remote sensing ground segments by K. Seidel & M Datcu
- 'Supervised ART-II' neural network for Landsat TM image classification by K R. Al-Rawi, G Gonzalo & E. Martinez
- Mode of spectral angular distribution function extraction by A Nekrassov
- Correction of the sea wave height measuring results in airborne dual-frequency scatterometer measurement by A. Nekrassov
- Shaping a field of acoustic parametric array in periodic structure with diffuse borders by M.Y. Georgi & N.P. Zagrai
- Quality and quantity of ground control points in the orthorectifying process by M C. S. Trigo & J VG. Cervera
- Tool for integration and bi-directional conversion of remote sensing data by A. Arquero, C Gonzalo, E. Martinez & O. Gordo
- Self-organized criticality in the environment and remotely sensed data by L.N.Vasiliev
- ECEP-ECHO: Extraction and classification of edge pixels in an ECHO approach by J. Garcia-Consuegra, A Martinez & G. Cisneros
- An adaptive soft thresholding method for Speckle noise reduction in Synthetic Aperture Radar images by A Vidal-Pantaleoni, D. Marti & M. Ferrando
- 2-D phase unwrapping in Synthetic Aperture Radar interferometry by A. Vidal-Pantaleoni, R. Oviol & M. Ferrando
- Radiometric characterisation of the olive tree crops by C. Pinilla, F.J. Ariza & M. Sanchez
- Adjustment of the satellite image to the three-dimensional relief model by L.N. Borovikova, S.V. Myagkov & I. Durdina
- Textural classification using textural signatures by A Kourgh & A Belhadj-Aissa
- The MPNA algorithm for atmospheric correction of satellite imagery by M Ouarzeddine & A Belhadj-Aissa
- An automatic method to calibrate Meteosat visible images by M Lefevre, O. Bauer, A. Iehle & L. Wald
- Education and research in remote sensing in Algeria by Y. Smara & A Belhadj-Aissa
5. FOREST FIRES
- Forest and fire monitoring with NOAA AVHRR imagery in the Central African Republic by I. EI Ghazzawi
- Building-up a Burned Area Monitoring System based on Earth Observation data by J.U. Paul, M.R. Caetano & T. Santos
- Remote sensing estimation of fuel moisture content by E. Chuvieco, PJ. Vaughan, D. Riano & D. Cocero
- Ground-based infrared characterization of fires in the 3-5 gm spectral window by A.J. de Castro, J.M. Aranda, S. Briz & F. Lopez
- Analysis of the environmental factors in forest wildfires in Aznalcollar and Sierra Bermeja by A.S. Redondo & J.V.G. Cervera
- Temperature maps obtained from satellite images for a forest wildfire temporal evolution analysis by A.S. Redondo & J.V.G. Cervera
- Automatic mapping of large scale forest fires in Spain using Landsat-TM images by E. Quintano, J.A. Delgado, A. Fernandez & P. Illera
- An operational system for the forest fire risk assessment by means of NOAA images by A. Calle, J.L. Casanova, A. Ronto & E.Gonzalez-Alonso
6. YIELD ESTIMATION
- Estimation of cereal yields combining crop growth models and remotely sensed vegetation indices by B.J. Denore, J.L. Meilan, J.M. Williams, M. Cole, K.J. de Koeijer, J.J. Colls & C. Trigueros
- Integration of satellite data and administrative information in crop yield monitoring by R. Kuittinen, L. Matikainen, Y. Keskisarja, E. Partnes & Y.Perdigao
- Operational use of NOAA data for crop condition assessment in Poland by Z. Bochenek
7. HAZARDS
- Monitoring the distribution of shallow landslide-prone areas using remote sensing, WM and GIS : A case study from the tropical Andes of Venezuela by H. Gomez, R.P. Bradshaw & P.M. Mather
- Towards an operational monitoring of drought conditions in Spain using satellite images by F. Gonzalez-Alonso, A. Vazquez, J.M. Cuevas, A. Calle & J.L. Casanova
- Land degradation assessment in a semi-arid environment through the use of spectral indices and spectral unmixing by D. Haboudane, F. Bonn, A. Royer, S. Sommer & W. Mehl
- A study on deposit and erosion phenomena along the southern coast of Sicily using satellite remote sensing by A.L. Geraci, F.F. Landolina & A.O. Trovato
8. OCEANOGRAPHY
- A mean sea level variation in the Mediterranean using Topex-Poseidon, ERS-1 and ERS-2 altimeter observations by M. Catalan-PU, P. Villares, M. Bruno, J.J. Alonso, A. Ruiz-Canavate & M. Catalan-M
- Red tides GIS monitoring the Galician Coast by P.C. Pardo, M.M.S. Cuadrado, J.M. Herrero & J.M.T. Palenzuela
- Location of tuna-fish banks in the Mediterranean Sea using NOAA images by A. Romo, J.L. Casanova & A. Calle
- Developing and testing of an atmospheric correction model for water leaving radiance retrieval in the area of the Gulf of Cadiz based on experimental measurements by V.E. Cachorro, R. Vergaz, A Berjon, A.M. De Frutos & J. Morales
- The use of Topex-Poseidon, ERS- 1 and ERS-2 altimeters to detect meddies by P. Villares, M. Bruno, J.J. Alonso, A. Ruiz-Canavate, M. Catalan-PU, M Catalan-M
- Environmental study in the estuary of river Miflo by L.B. Villar, J.M. Herrero, J.M.T. Palenzuela & L.E. Fernandes
- Applications of SAR images in the western Mediterranean Sea by J.J.M. Benjamin, J.M. Redondo, J. Jorge & A. Platonov
- Pressure ridges extraction using Radarsat fine beam mode by E Hudier
9 GEOLOGY
- A GIS for the Natural Resources Authority, Amman, Jordan by H.J. Baxendale & L.A. Abu Saad
- Developing a technical computing facility at the Geological Commission in Guyana by A.P. Marchant & J.R. Gibson
- A remote sensing based approach for the restoration of an open-cast coal mine site in Spain by J.F. Llorens, J.L. Fernandez-Turiel, C. Banninger & A. Almer
- Discrimination of active alluvial sedimentary surfaces in TM images based on laboratory reflectance spectroscopy by E. Garcia-Melendez, A. Riaza & M. Sudrez
- Lithological and geomorphological large-scale mapping using remotely sensed data, GIS and terrain analysis by E. Wolk-Musial & B. Zagajewski
- Geomorphological-geological evaluation of the Gazikoy-Saros section of Northern Anatolian Fault zone using remotely sensed data by S. Kaya & O. Muftuoglu
10. RADAR AND HYPERSPECTRAL TECHNIQUES
- Optical indices as bioindicators of forest condition from hyperspectral CASI data by P.J. Zarco-Tejada, J.R. Miller, G.H. Mohammed, T.L. Noland & P.H. Sampson
- Metric relations in INSAR topographic modeling by G. Brandstadtter & A.L. Sharov
- Advanced polarimetric SAR data classification for cartographic information extraction by M.E. Buchroithner, E. Kraetzschmar & M. Hellmann
- A model for atmospheric correction of DAIS hyperspectral imager sensor based on experimental optical measurements by V.E. Cachorro, R. Vergaz & A.M. De Frutos
- Refined adaptive speckle filtering for SAR images by D. Cherifi & Y. Smara
- Textural classification using textural signatures by A. Kourgli & A. Belhadj-Aissa
- SAR imagery in urban area by L. Basly, E. Cauneau, T. Ranchin & L. Wald
- Scale evolution due to hydrodynamic modulation of SAR imaging by I.-F. Shen, M.J. Liou & Y. Li
- A unified approach to change analysis and despeckle of multitemporal ERS-1 by L. Alparone, S. Baronti, M Falugi & A. GarzelliNuméro de notice : 13020 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Actes Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=34606 Contient
- Temperature maps obtained from satellite images for a forest wildfire temporal evolution analysis / A.S. Redondo (31/05/1999)
- Advanced polarimetric SAR data classification for cartographic information extraction / Manfred F. Buchroithner (31/05/1999)
- SAR imagery in urban area / L. Basly (31/05/1999)
- Automatic mapping of large scale forest fires in Spain using Landsat-TM images / E. Quintano (31/05/1999)
- Refined adaptive speckle filtering for SAR images / Y. Smara (31/05/1999)
- The application of aerial photographs for analysis of landscape diversity in reserve Grzedy, Biebrza national parc, Poland / M. Falencka-Jablonska (31/05/1999)
- An operational system for the forest fire risk assessment by means of NOAA images / A. Calle (31/05/1999)
- Textural classification using textural signatures / A. Kourgli (31/05/1999)
- Drought monitoring based on thermal and microwave satellite data / Katarzyna Dabrowska-Zielinska (31/05/1999)
- Monitoring the distribution of shallow landslide-prone areas using remote sensing, DTM and GIS: a case study from the tropical Andes of Venezuela / H. Gomez (31/05/1999)
- Drought monitoring of Spanish forests using Landsat TM satellite images / Águeda Vázquez (31/05/1999)
- Forest and fire monitoring with NOAA AVHRR imagery in the central African Republic / I. El Ghazzawi (31/05/1999)
- Towards an operational monitoring of drought conditions in Spain using satellite images / F. Gonzalez-Alonso (31/05/1999)
- Building-up a burned area monitoring system based on Earth observation data / J.U. Paul (31/05/1999)
- A study on deposit and erosion phenomena along the southern coast of Sicily using satellite remote sensing / A.L. Geraci (31/05/1999)
- Remote sensing estimation of fuel moisture content / E. Chuvieco (31/05/1999)
- Optical indices as bioindicators of forest condition from hyperspectral CASI data / Pablo J. Zarco-Tejada (31/05/1999)
- Analysis of the environment factors in forest wildfires in Aznalcollar and Sierra Bermeja / A.S. Redondo (31/05/1999)
- Metric relations in INSAR topographic modelling / G. Brandstätter (31/05/1999)
Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 13020-01 CG.99 Livre Centre de documentation Congrès Disponible
Titre : La station laser ultra mobile : de l'obtention d'une exactitude centimétrique des mesures à des applications en océanographie et géodésie spatiales Type de document : Thèse/HDR Auteurs : Joëlle Nicolas, Auteur ; Michel Kasser , Directeur de thèse ; F. Pierron, Directeur de thèse Editeur : Nice : Université de Nice - Sophia Antipolis Année de publication : 2000 Importance : 252 p. Format : 21 x 30 cm Note générale : Bibliographie
Thèse présentée pour obtenir le titre de docteur en sciences, mention sciences de l'universLangues : Français (fre) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] géopositionnement
[Termes IGN] océanographie spatiale
[Termes IGN] orbitographie
[Termes IGN] précision centimétrique
[Termes IGN] satellite d'observation de la mer
[Termes IGN] Station laser ultra-mobile
[Termes IGN] télémétrie laser
[Termes IGN] télémétrie laser sur la LuneIndex. décimale : THESE Thèses et HDR Résumé : (Auteur) La Station Laser Ultra Mobile est la plus petite station de télémétrie laser au monde, ne pesant que 300 kg, dédiée à la poursuite de satellites équipés de rétro réflecteurs laser. Elle utilise un petit télescope de 13 cm de diamètre placé sur une monture issue d'un théodolite de précision et motorisé, un laser très compact et une photo diode à avalanche permettant la détection au niveau du simple photo électron. Les premières expériences (Corse, fin 1996) ont révélé de nombreuses instabilités dans la qualité des mesures. Ce travail concerne l'étude et la mise en place de nombreuses modifications techniques afin d'atteindre une exactitude centimétrique des mesures et de pouvoir participer à la campagne de validation des orbites et d'étalonnage de l'altimètre du satellite océanographique JASON--1 (2001). La précision instrumentale souhaitée a été vérifiée avec succès en laboratoire pour le chronomètre et le photo détecteur de retour. Outre cet aspect instrumental et métrologique, une analyse a été développée afin de pouvoir estimer l'exactitude et la stabilité des observations de la station mobile après intégration des modifications. A partir d'une expérience de colocalisation entre les deux stations laser fixe du plateau de Calem, l'analyse est basée sur l'ajustement, par station, de coordonnées et d'un biais instrumental moyen à partir d'une orbite de référence des satellites LAGEOS. Des variations saisonnières ont été mises en évidence dans les séries temporelles des différentes composantes. La comparaison locale des variations d'altitude issues des données laser montre une cohérence remarquable avec les mesures d'un gravimètre absolu transportable (FG5). Ces variations sont également mises en évidence à l'échelle mondiale et leur interprétation géophysique est faite (combinaison des effets de marées terrestres et polaires et des effets de charge atmosphérique). Numéro de notice : 12550 Affiliation des auteurs : LOEMI (1985-2011) Thématique : POSITIONNEMENT Nature : Thèse française Note de thèse : Thèse de docteur en sciences : sciences de l'univers : Nice - Sophia Antipolis : 2000 Organisme de stage : LOEMI (IGN) nature-HAL : Thèse DOI : sans En ligne : https://tel.hal.science/tel-00007083 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=45183 Réservation
Réserver ce documentExemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 12550-02 THESE Livre Centre de documentation Thèses Disponible 12550-01 THESE Livre Centre de documentation Thèses Disponible A system analysis of salt marsh development along the mainland coast of the Dutch Wadden Sea / Brigit Janssen-Stelder (2000)
Titre : A system analysis of salt marsh development along the mainland coast of the Dutch Wadden Sea Type de document : Thèse/HDR Auteurs : Brigit Janssen-Stelder, Auteur Editeur : Utrecht : Université d'Utrecht Année de publication : 2000 Collection : Netherlands Geographical Studies NGS, ISSN 0169-4839 num. 275 Importance : 128 p. Format : 17 x 24 cm ISBN/ISSN/EAN : 978-90-6809-302-5 Note générale : Bibliographie
90-6266-188-2 (Thesis)Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Ecologie
[Termes IGN] analyse spatiale
[Termes IGN] érosion côtière
[Termes IGN] estuaire
[Termes IGN] littoral
[Termes IGN] marais salé
[Termes IGN] montée du niveau de la mer
[Termes IGN] Pays-Bas
[Termes IGN] sédimentation
[Termes IGN] Wadden, mer desNuméro de notice : 11784 Affiliation des auteurs : non IGN Nature : Thèse étrangère DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62532 Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 11784-01 50.10 Livre Centre de documentation Environnement Disponible The influence of data quality on the detectability of sea-level height variations / K.I. Van Onselen (2000)
Titre : The influence of data quality on the detectability of sea-level height variations Type de document : Thèse/HDR Auteurs : K.I. Van Onselen, Auteur Editeur : Delft : Netherlands Geodetic Commission NGC Année de publication : 2000 Collection : Netherlands Geodetic Commission Publications on Geodesy Sous-collection : New series num. 49 Importance : 204 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-90-6132-273-3 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] marée océanique
[Termes IGN] marégramme
[Termes IGN] marégraphe
[Termes IGN] niveau de la mer
[Termes IGN] niveau moyen des mers
[Termes IGN] qualité des données
[Termes IGN] série temporelle
[Termes IGN] variation
[Vedettes matières IGN] AltimétrieIndex. décimale : 30.50 Nivellement - généralités Résumé : (Auteur) For low-lying areas like the Netherlands, an over-increasing sea level can become a serious threat. This is especially true if sea level rise accelerates, e.g., due to greenhouse-gas induced warming. To anticipate potential troubles, it is important to have a good estimate of the expected behaviour of future sea levels. This requires an accurate description of the present-day sea level variation curve and of foreseeable changes in this "natural" pattern in the near future. These changes in the behaviour of future sea levels can be based, e.g., on models predicting global change, but this is beyond the scope of this thesis. Much simplified, sea level rise over the last century could be described by a linear regression line. Accelerations of this "natural" pattern have occurred if the slope value of the regression line increases, or higher order regression coefficients are required to describe the sea-level rise curve. The better the natural sea level variation curve (as has occurred over the last century) can be determined, the easier it will be to detect a significant divergence from this curve. The objective of this thesis is to determine how well patterns in sea level height variations can be detected, given the limited quality of the data available. The objective of this thesis requires long sea level height time series. Therefore, only tide gauge data has been used and altimetry sea level height series have not been considered. Tide gauges measure sea level heights relative to the tide gauge bench marks. Consequently, the resulting sea level height time series show both variations in absolute sea level and vertical movements of the tide gauge bench marks. By monitoring the height changes between the tide gauge bench marks and a stable reference height, these relative sea level heights can (in principle) be converted into absolute sea level changes. Unfortunately, locating a reference point which is truly stable over long time spans will be extremely difficult, if not impossible. How well a specific sea level variation pattern can be detected depends on the sea level variations them-selves, the quality of the tide gauge measurements and, if applicable, the quality ofgeodetic measurements used to connect the tide gauge bench marks in height. Based on existing literature, it has been tried to gain a clear understanding of these various aspects. Unfortunately, in the literature studied on processes which can influence relative sea-level heights, (almost) no mention is made of long-periodic processes (periods over 20 years), while analysis of tide gauge records shows that long-periodic fluctuations with significant amplitudes do occur in sea level height time series. Sea level heights as used in this thesis are annual mean sea levels. The quality of these annual mean values not only depends on the quality of the tide gauge measurements, but also on the frequency of these measurements. Not only the quality of state-of-the-art techniques is important, but also of tide gauges and measuring frequencies which were used in the past. Since estimating long-term sea level variation curves requires long sea level height series, historical measurements have to be used as well. In chapter 3, an overview is given of the measuring precision and systematic errors and limitations characteristic for the six tide gauge systems commonly used during the last century. Based on information available for Dutch tide gauges, an estimate is given of how much the quality of annual mean sea levels deteriorates if mean values arc based on, e.g., mean tide levels instead of on hourly measurements. If data for a number of tide gauges is available, a common sea level variation curve, e.g., applying to the Dutch coast, can be estimated. Since tide gauge measurements are relative to the local tide gauge bench mark, any vertical movements of the tide gauges relative to one another will have introduced inconsistencies between the individual time series. These inconsistencies reduce the quality of a common sea level variation curve based on these tide gauge series. As long as tide gauges experience only secular height movements relative to one another, the common oscillation pattern can still be discerned using techniques like svd. However, the slope of the estimated common variation curve is determined by the rate of vertical movements of the individual tide gauges. If tide gauges undergo vertical movements which vary in rate and over time, the common oscillation pattern will be affected as well. By relating all sea level height series to the same reference frame (e.g., nap) internal differences in relative sea level due to vertical movements of the tide gauge bench marks are removed from the data sets. Ideally, permanent monitoring of the tide gauge bench marks is applied.
Nowadays, this can be achieved by means of tips. However, in the past height differences were usually based on spirit levelling. In chapter 6, the quality of three geodetic techniques, i.e., gps, gravimetry, and spirit levelling is described. In addition, limitations of these techniques when applied to monitoring height changes of tide gauge bench marks arc discussed. Since changes in local gravity represent both variations in mass and changes in station height, gravimetry is not well suited for determining height differences. Uncertainties in height differences obtained by GPS can be reduced to within 1 cm. However, the quality of these measurements might be less in harbor areas (e.g., due to signal interference). GPS has the advantage that it allows for permanent monitoring over large distances, but measurements are only available for the last few decades. Spirit leveling can produce high precision height differences (over short distances), but is time consuming and prone to systematic errors (especially over long distances). However, leveled height differences arc often the only type of height information available. In the past, tide gauge bench marks have (hopefully) been connected to a local reference frame. Between some neighboring local height datums, height differences have occasionally been obtained as well. However, only since the second European leveling network (UELN-73), the height difference between the continent of Europe and Scandinavia and Great Britain respectively is available. These height connections consist of only a single connection line and, consequently, errors in these height differences cannot be detected by testing. In chapter 8, an indirect method is introduced for connecting vertical datums, which results in dynamic height differences between the fundamental stations in the various height datum zones. An advantage of this method is that quality information (both precision and reliability) of the estimated height differences can dc determined as well. Unfortunately, a high quality potential coefficient model is required. As a result, only if a new model (to be obtained from the planned GOCR mission) becomes available, height differences between datum zones could be derived with standard deviations of 1 cm.
The quality of sea level variation curves depends on the method used to estimate these curves. A number of data analysing techniques have been tested for their suitability for working with sea level height data. Sea level height time series have a number of specific characteristics, for instance non-stationarity, data quality which is not constant for the complete time series, and a wide range of periodic fluctuations with sometimes variable frequencies and amplitudes. As a result, most of the techniques examined do not work well when applied to sea level height data. It is found that the best techniques for smoothing sea level height series are moving average smoothing and Singular Spectrum Analysis, while estimates of future sea level heights should be based on cither AR(i)MA modelling or regression. To determine how well specific sea level variation patterns can be detected, experiments with a large variety of simulated sea level height time series have been performed. These simulated time series consist of the curve which needs to be detected (e.g., a linear trend), periodic fluctuations (based on actual tide gauge data) and simulated additional errors. This can cither be inaccuracies introduced by the tide gauge equipment or the height measurements, or (uncorrected for) height variations between tide gauge bench marks. By applying regression to the simulated time series, it is examined whether or not the original sea level variation curve can be recovered. It should be noted that statistical significance of estimated regression coefficients is no guarantee that the "true" sea level variation curve is detected. For example, if linear regression is applied to a sea level series following a quadratic curve, the estimated trend value can still be statistically significant. For this reason, often trend estimates are shown as a function of an increasing number of observations. For the above mentioned example, estimated trend values will steadily increase with an increasing number of included observations. Only if the model (of a linear regression line) fits the data, and if enough observations are available, estimated trend values will stabilise around the trend value actually present in the data set. First, experiments have been performed with sea level height data for a single tide gauge. In this case, the original data relative to the tide gauge bench mark can be used. If (based on external knowledge of the behavior of the local sea level) long-periodic fluctuations could be eliminated from the data set, the detectability of a single linear regression line depends on the trend value and the noise level of the measurements. For sea level data with a trend of 1.5 mm/yr, even if a noise level of 5 cm applies, this trend can be detected if 35 observations are available. If a simulated time series contains long-periodic fluctuations based on data for tide gauge Den Helder, of the order of 90 years of observations are required before trend estimates stabilise around the actual trend value on which the data set is based. Therefore, it is concluded that long-periodic fluctuations are the main factor in determining the amount of data required to detect a linear trend in a sea level height time series. In chapter 7, using six tide gauge data sets, a common sea level variation curve for the Dutch coast is estimated. In order to eliminate deviations from this common curve caused by height variations of the tide gauge bench marks relative to one another, all tide gauges have to be connected in height to the local reference system (nap). Inaccuracies in the required height connections introduce inconsistencies between the time series. Since the actual height connection history for the tide gauges is unknown, a number of scenarios have been used to simulate height connection errors. Experiments show that the quality of the estimated common variation curve not only depends on the precision of the height measurements, but also on the time span between subsequent height connections. For higher levels of connection noise, it is more pronounced that the larger the time span between subsequent connections, the less dependable the estimated trend values will be. In order to detect future sea level rise accelerations, historical data has to be used as well. Experiments show that, if long periods have elapsed between historic height connections, the precision of future height connections is of almost no importance. Increasing the standard deviation of future height measurements from 5 mm to 2 cm, or increasing the time span between height connections from one to 10 years, hardly influences the results. Finally, for the North Sea area, the quality of spatial variation patterns which can be derived based on trend values for 18 tide gauges, is examined. A spatial pattern in sea level height variations should be based on real differences in trend values for the various locations and not on variations resulting from measuring errors and height changes between tide gauge bench marks. Based on experiments with simulated time series, the following conclusions have been made. If height connections to a local reference frame are performed every 10 years, ranges of errors in trend estimates (as a function of latitude and longitude) are three times as large as results based on annual connection of heights. As a result of, e.g., post-glacial rebound, fundamental stations in the different datum zones can experience height changes relative to one another. If the individual time series (connected to the local datums) are not corrected for these relative vertical movements, this will result in large errors in the estimated spatial variation pattern. If height differences between vertical datum zones are based on results derived for European leveling networks, resulting errors in trend values (as a function of latitude and longitude) will be much larger than those caused by the post-glacial rebound movements (of the selected fundamental stations: Amsterdam, Newlyn, and Helsingborg) itself. This same holds for differences in vertical movements obtained by GPS measurements with a standard deviation of the order of 1 mm/yr.Note de contenu : 1 INTRODUCTION
Sea-level variations
Objectives of this thesis
Outline
2 TIDE GAUGE MEASUREMENTS
Introduction
Error characteristics of tide gauge instruments
Sampling rate and averaging method of tide gauge readings
Conclusions and recommendations
3 TECHNIQUES FOR ANALYSING SEA-LEVEL DATA
Introduction
Smoothing of tide gauge data
Prediction of future sea levels
Sea-level data for a group of tide gauges
Conclusions and recommendations
4 DETECTABILITY OF CURVES IN RELATIVE SEA LEVEL
Introduction
Estimating curves in individual time series
General structure of simulated data sets
" Ideal " measurement series
Time series containing short-periodic fluctuations
Time series containing short- and long periodic fluctuations
Conclusions and recommendations
5 CONNECTING TIDE GAUGES TO A LOCAL HEIGHT SYSTEM
Introduction
Problems related to the different " height " systems
Error characteristics of measuring techniques
Selection of observation sites
Required sampling and time span of measurements
6 DETECTABILITY OF CURVES IN SEA LEVEL RELATIVE TO A LOCAL DATUM
Introduction
General structure of simulated data sets
Same trend throughout the time series
Transition to higher trend at the beginning of the time series
Transition to higher trend at the end of the time series
Conclusions and recommendations
7 REGIONAL HEIGHT DATUM CONNECTION
Introduction
Adding datum shifts to a geodetic boundary value problem
Least squares solution of a vertical datum connection
A-priori covariance matrices
Datum connection in North-West Europe
" Ideal " cap size for terrestrial gravity measurements
Influence of the number of stations
Conclusions and recommendations
8 SEA-LEVEL VARIATION PATTERNS
Introduction
General structure of simulated data sets
Inconsistencies in annual mean values
Inconsistencies introduced by local height connections
Height datums experience linear movements
Vertical datum connection
Conclusions and recommendations
9 CONCLUSIONS AND RECOMMENDATIONS
Conclusions
General remarks concerning sea-level monitoring
Recommendations for future research
A Information concerning tide gauge stations
B Derivations
C Additionnal information concerning common variations curvesNuméro de notice : 11431 Affiliation des auteurs : non IGN Autre URL associée : Complément Thématique : POSITIONNEMENT Nature : Thèse étrangère DOI : sans En ligne : https://www.ncgeo.nl/downloads/49VanOnselen_1.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54405 Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 11431-01 30.50 Livre Centre de documentation Géodésie Disponible Réflexions méthodologiques sur les observations de terrain et la télédétection : (cartographie des Sandurs en baie du roi, Spitsberg nord-occidental) / D. Laffly in Photo interprétation, vol 37 n° 2 (Juillet 1999)
[article]
Titre : Réflexions méthodologiques sur les observations de terrain et la télédétection : (cartographie des Sandurs en baie du roi, Spitsberg nord-occidental) Type de document : Article/Communication Auteurs : D. Laffly, Auteur ; D. Mercier, Auteur Année de publication : 1999 Article en page(s) : pp 15 - 28 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] baie
[Termes IGN] échantillonnage d'image
[Termes IGN] modèle statistique
[Termes IGN] ruissellement
[Termes IGN] Spitzberg
[Termes IGN] terrainRésumé : (Documentaliste) Présentation d'une méthode de choix des points à analyser, fondée sur la technique du sondage systématique non-aligné, en tenant compte de la valeur des points observés et leur localisation pour définir un plan d'échantillonnage en vue d'une modélisation statistique. Les exemples sont tirés d'une étude réalisée sur les sandurs de la presqu'île de Brogger au Spitsberg nord-occidental. Numéro de notice : A1999-113 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26317
in Photo interprétation > vol 37 n° 2 (Juillet 1999) . - pp 15 - 28[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 104-99021 RAB Revue Centre de documentation En réserve L003 Disponible La contribution française aux programmes de l'ASE [agence spatiale européenne] en observation de la Terre / Patrick Vincent in Bulletin [Société Française de Photogrammétrie et Télédétection], n° 154 (Avril 1999)PermalinkLittoral, frontières marines / Fernand Verger in Hérodote, n° 93 (01/03/1999)PermalinkApport des données interférométriques SAR ERS pour l'étude des états de surface / C. Lesage (1999)PermalinkMarine and coastal geographical information systems / D.J. Wright (1999)PermalinkRapport d'activité 1998 et propositions de recherche spatiale 2000, 1. Rapport d'activité 1998 GRGS / Georges Balmino (1999)PermalinkRétablissement du caractère maritime du Mont Saint-Michel : programme technique détaillé, 1. Situation existante / Mission Mont-Saint-Michel (1999)PermalinkRétablissement du caractère maritime du Mont Saint-Michel : programme technique détaillé, 2. 2, Objectifs et grandes lignes du projet, organisation et méthodes de travail / Mission Mont-Saint-Michel (1999)PermalinkRétablissement du caractère maritime du Mont Saint-Michel : programme technique détaillé, 3. 3, Principes d'action proposés / Mission Mont-Saint-Michel (1999)PermalinkRétablissement du caractère maritime du Mont Saint-Michel : programme technique détaillé, 4. 4, Rétablir le caractère maritime du mont Saint-Michel : les solutions proposées / Mission Mont-Saint-Michel (1999)PermalinkRétablissement du caractère maritime du Mont Saint-Michel : programme technique détaillé, 5. 5, Requalifier le site et revaloriser l'approche des visiteurs : les solutions proposées / Mission Mont-Saint-Michel (1999)PermalinkRétablissement du caractère maritime du Mont Saint-Michel : programme technique détaillé, 6. 6, Evaluation environnementale / Mission Mont-Saint-Michel (1999)PermalinkRétablissement du caractère maritime du Mont Saint-Michel : programme technique détaillé, 7. 7, Calendrier prévisionnel / Mission Mont-Saint-Michel (1999)PermalinkRétablissement du caractère maritime du Mont Saint-Michel : programme technique détaillé, 8. 8, Communiqué de presse / Mission Mont-Saint-Michel (1999)PermalinkRSS 99 Earth observation / P. Pan (1999)PermalinkThermodynamics of atmospheres and oceans / J.A. Curry (1999)PermalinkTopex-Poséïdon, mesureur des océans / J.P. Penot in BT, Bibliothèque de Travail, n° 1103 (01/12/1998)PermalinkDeep-sea geodesy: monitoring the ocean floor / D. Chadwell in GPS world, vol 9 n° 9 (September 1998)PermalinkAn overview of MODIS capabilities for ocean science observations / W.E. Esaias in IEEE Transactions on geoscience and remote sensing, vol 36 n° 4 (July 1998)PermalinkUn projet pour "désensabler" la baie du Mont-Saint-Michel / Jean Denègre in Géomètre, vol 1998 n° 7 (juillet 1998)PermalinkAnalyse des paysages côtiers par signatures radar : expérimentation GlobeSAR / G. Bonnaffoux in Photo interprétation, vol 36 n° 2-3 (Mai 1998)Permalink