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SPOT-4 Vegetation multi-temporal compositing for land cover change studies over tropical regions / João M.B. Carreiras in International Journal of Remote Sensing IJRS, vol 26 n° 7 (April 2005)
[article]
Titre : SPOT-4 Vegetation multi-temporal compositing for land cover change studies over tropical regions Type de document : Article/Communication Auteurs : João M.B. Carreiras, Auteur ; J.M.C. Pereira, Auteur Année de publication : 2005 Article en page(s) : pp 1323 - 1346 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] analyse en composantes principales
[Termes IGN] autocorrélation spatiale
[Termes IGN] cohérence des données
[Termes IGN] détection de changement
[Termes IGN] filtrage du bruit
[Termes IGN] forêt tropicale
[Termes IGN] image multitemporelle
[Termes IGN] image optique
[Termes IGN] image SPOT-Végétation
[Termes IGN] Mato Grosso
[Termes IGN] nébulosité
[Termes IGN] rapport signal sur bruit
[Termes IGN] Soil Adjusted Vegetation Index
[Termes IGN] surveillance agricole
[Termes IGN] utilisation du sol
[Termes IGN] zone intertropicaleRésumé : (Auteur) Multi-temporal compositing of SPOT-4 VEGETATION imagery over tropical regions was tested to produce spatially coherent monthly composite images with reduced cloud contamination, for the year 2000. Monthly composite images generated from daily images (S1 product, 1-km) encompassing different land cover. types of the state of Mato Grosso, Brazil, were evaluated in terms of cloud contamination and spatial consistency. A new multi-temporal compositing algorithm was tested which uses different criteria for vegetated and non-vegetated or sparsely vegetated land cover types. Furthermore, a principal components transformation that rescales the noise in the image-Maximum Noise Fraction (MNF)- was applied to a multi-temporal dataset of monthly composite images and tested as a method of additional signal-to-noise ratio improvement. The back-transformed dataset using the first 12 MNF eigenimages yielded an accurate reconstruction of monthly composite images from the dry season (May to September) and enhanced spatial coherence from wet season images (October to April), as evaluated by the Moran's 1 index of spatial autocorrelation. This approach is useful for land cover- change studies in the tropics, where it is difficult to obtain cloud-free optical remote sensing imagery. In Mato Grosso, wet season composite images are important for monitoring agricultural crop cycles. Numéro de notice : A2005-178 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160512331338005 En ligne : https://doi.org/10.1080/01431160512331338005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27315
in International Journal of Remote Sensing IJRS > vol 26 n° 7 (April 2005) . - pp 1323 - 1346[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 080-05071 RAB Revue Centre de documentation En réserve L003 Exclu du prêt Hierarchical recovery of digital terrain models from single and multiple return lidar data / Y. Hu in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 4 (April 2005)
[article]
Titre : Hierarchical recovery of digital terrain models from single and multiple return lidar data Type de document : Article/Communication Auteurs : Y. Hu, Auteur ; V. Tao, Auteur Année de publication : 2005 Article en page(s) : pp 425 - 433 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] approche hiérarchique
[Termes IGN] classification par seuillage sur la limite la plus proche
[Termes IGN] convolution (signal)
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] interpolation
[Termes IGN] lasergrammétrie
[Termes IGN] modèle numérique de terrainRésumé : (Auteur) A hierarchical terrain recovery approach for generating digital terrain models (DTM) from single and multiple returns lidar data is presented in this paper. The algorithm can intelligently discriminate between terrain and non-terrain points by using adaptive and robust filtering and interpolation techniques. It processes the image pyramid, bottom-up and top-down, to estimate high-quality terrain surfaces from lidar data with varying point densities and scene complexities. Using road and vegetation information, the algorithm is able to adaptively adjust thresholds to be suited to process changing contents in a large scene. The algorithms have been tested extensively using multiple medium - and high - resolution lidar datasets. The worst-case error is below 25 cm Linear Error (LE) 90 comparing the derived DTMs and the raw range images on bare surfaces when testing several lidar datasets. Copyright ASPRS Numéro de notice : A2005-589 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : https://doi.org/10.14358/PERS.71.4.425 En ligne : https://doi.org/10.14358/PERS.71.4.425 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27724
in Photogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 4 (April 2005) . - pp 425 - 433[article]On improving navigation accuracy of GPS/INS systems / Dorota A. Grejner-Brzezinska in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 4 (April 2005)
[article]
Titre : On improving navigation accuracy of GPS/INS systems Type de document : Article/Communication Auteurs : Dorota A. Grejner-Brzezinska, Auteur ; Charles K. Toth, Auteur ; Y. Yi, Auteur Année de publication : 2005 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] capteur à balayage
[Termes IGN] capteur imageur
[Termes IGN] centrale inertielle
[Termes IGN] élément d'orientation externe
[Termes IGN] filtrage du bruit
[Termes IGN] géoréférencement direct
[Termes IGN] GPS-INS
[Termes IGN] modèle d'erreur
[Termes IGN] modèle stochastique
[Termes IGN] orientation du capteur
[Termes IGN] pesanteur terrestre
[Termes IGN] point d'appui
[Termes IGN] positionnement par GPS
[Termes IGN] précision de localisation
[Termes IGN] système de numérisation mobileRésumé : (Auteur) Direct georeferencing, also referred to as direct platform orientation (DPO), is defined as direct measurement of the imaging sensor external orientation parameters (EOP), using positioning and orientation sensors, such as the Global Positioning System (GPS) and Inertial Navigation System (INS) or Inertial Measurement Unit (Imu). Imaging sensors, most frequently supported by the Dpo technique, are digital cameras, lidar systems, multi-spectral or hyper-spectral scanners, or interferometric synthetic aperture radar (INSAR). While for scanning sensors, the use of Dpo is compulsory, frame digital cameras can also directly benefit from this modern technique of sensor orientation. With direct sensor orientation, the requirement for ground control, tie-point matching and aerotriangulation (AT) is significantly reduced, or even entirely eliminated, resulting in shorter times of data acquisition and processing, and streamlined and highly automated data workflow and quality control. Most of the time, the requirement for ground control points is limited to periodic system calibrations and quality control check. Direct georeferencing is considered a fundamental technology of conventional mobile mapping systems (MMS). Despite significant progress in GSP/INS-based direct georeferencing technology in the last decade, there is still room for improvement in terms of better accuracy and better tolerance to GPS outages. This paper is focused on three error modeling and compensation techniques that could potentially improve GPS/INS system's performance on both land-based and airborne platforms : (1) extended gravity compensation, (2) IMU signal de-noising, and (3) stochastic modeling of IMU errors. Numéro de notice : A2005-158 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.14358/PERS.71.4.377 En ligne : https://doi.org/10.14358/PERS.71.4.377 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27296
in Photogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 4 (April 2005)[article]Doris satellite antenna maps derived from long-term residuals time series / Pascal Willis in Advances in space research, vol 36 n° 3 (March 2005)
[article]
Titre : Doris satellite antenna maps derived from long-term residuals time series Type de document : Article/Communication Auteurs : Pascal Willis , Auteur ; Shailen Desai, Auteur ; Willy I. Bertiger, Auteur ; Bruce J. Haines, Auteur ; Albert Auriol, Auteur Année de publication : 2005 Article en page(s) : pp 486 - 497 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] balise DORIS
[Termes IGN] DORIS
[Termes IGN] orbitographie
[Termes IGN] phase
[Termes IGN] récepteur DORIS
[Termes IGN] série temporelle
[Termes IGN] trajet multipleRésumé : (Auteur) Recent studies have shown that phase pattern models for the Jason1 GPS antenna significantly benefit GPSbased precise orbit determination (POD) for the satellite. We have used a similar technique to derive DORIS receiver antenna maps, using all available DORIS tracking data over long time periods (from 1993.0 to 2004.0). We demonstrate that the derived correction models are satellite specific. For a given satellite, yeartoyear estimations show clear systematic patterns. Some of these systematic patterns are attributable to the derivative of the multipath effects in the direction of the satellite velocity. For early SPOT data, the patterns can be explained by an offset in the TAI time tagging (typically 8 us). In a second step, we have applied the SPOT2 antenna correction models in precise orbit determination and in the positioning of ground beacons. Preliminary results on DORIS/SPOT2 show that application of the DORIS antenna maps lead to a slight improvement of the derived POD and geodetic results (typically less than 5%). Numéro de notice : A2005-603 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2005.03.095 Date de publication en ligne : 06/05/2005 En ligne : https://doi.org/10.1016/j.asr.2005.03.095 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33946
in Advances in space research > vol 36 n° 3 (March 2005) . - pp 486 - 497[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 38017-01 30.82 Tiré à part Centre de documentation Géodésie Disponible Effects of thermosphere total density pertubations on LEO Orbits during severe geomagnetic conditions (Oct-Nov 2003) using Doris and SLR data / Florent Deleflie in Advances in space research, vol 36 n° 3 (March 2005)
[article]
Titre : Effects of thermosphere total density pertubations on LEO Orbits during severe geomagnetic conditions (Oct-Nov 2003) using Doris and SLR data Type de document : Article/Communication Auteurs : Florent Deleflie, Auteur ; François Barlier, Auteur ; Yoaz E. Bar-Sever, Auteur ; L.J. Romans, Auteur ; Pascal Willis , Auteur Année de publication : 2005 Article en page(s) : pp 522 - 533 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] bruit blanc
[Termes IGN] données DORIS
[Termes IGN] filtrage du bruit
[Termes IGN] géomagnétisme
[Termes IGN] orbite basse
[Termes IGN] orbitographie
[Termes IGN] télémétrie laser sur satellite
[Termes IGN] tempête magnétique
[Termes IGN] thermosphèreRésumé : (Auteur) An exceptional solar activity event occurred at the end of October 2003. On October 29th, seven groups of sunspots were visible on the Sun's surface and the geomagnetic index Kp reached the extreme value of 9, leading to beautiful auroras, among other effects. Similar events also occurred in November 2003. These events have been an exceptional opportunity to estimate effects of the thermosphere total density perturbations in extreme conditions on a Low Earth Orbit (LEO orbit corresponding in this study at altitudes ranging from 800 km up to 1400 km). Specifically, we study the best way to get reliable geodetic products even during such solar events, and how well the thermosphere models (DTM78, DTM94, DTM2000, and MSIS86 models) allow us to accomplish this and to predict the observed perturbations on the orbital elements. Thus our analysis is twofold. First, we have computed orbits of satellites equipped with the onboard DORIS tracking system, at an altitude ranging from 800 to 1330 km and for periods of time including these exceptional events (October 2931 and November 20, 2003). We have computed 30hour arc orbits, estimating the drag coefficient parameter very frequently (every minute) using a tight randomwalk constraint or using a white noise reset in the Gipsy/Oasis software. We show that significant errors are obtained for the considered thermosphere models, but can be greatly improved. using a more sophisticated data processing. We also investigated how these proposed processing strategies affect the quality of the DORIS geodetic products. Significant improvements were found for weekly stations coordinates estimations as well as for polar motion determination.
In addition, we have investigated the global quality of the modeling of the variations of the mean orbital elements in using thermosphere models over long periods of time including such severe geomagnetic events. This original approach is based on averaging techniques implemented in the CODIOR software. We have analysed the continuous longterm evolution of the semimajor axis of the geodetic satellites Starlette, Stella and Ajisai tracked by the Satellite Laser Ranging (SLR) network. In this second part, we give: (i) a single global empirical coefficient per satellite, to validate the models over the whole duration of the orbital arc, including the exceptional solar activity events, and (ii) one coefficient per a period of about 2 months to quantify the seasonal differences between the models and the observations.
As a result of both investigations, we compare the capability of recent models of thermosphere to allow us to get reliable geodetic products and mean orbital elements variations over short and long periods of time as well as for the recent exceptional geomagnetic events. Different altitudes are considered: around 800900 km for the Stella and Starlette satellites tracked by laser ranging systems and SPOT tracked by DORIS; around also 13001400 km for the Ajisai satellite tracked by laser techniques and TOPEX and Jason also tracked by DORIS. It appears in our study that laser and DORIS data are complementary to probe the thermosphere, and to test the quality of thermosphere models in specific conditions for getting accurate geodetic products.Numéro de notice : A2005-611 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2005.03.029 Date de publication en ligne : 13/04/2005 En ligne : https://doi.org/10.1016/j.asr.2005.03.029 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33947
in Advances in space research > vol 36 n° 3 (March 2005) . - pp 522 - 533[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 38017-01 30.82 Tiré à part Centre de documentation Géodésie Disponible Validation expérimentale du logiciel de lancer de rayons Ergospace et estimation de la précision du MNE requise pour son utilisation (article) / Thomas Tirtaine in XYZ, n° 102 (mars - mai 2005)PermalinkComparison between Mallat's and 'a trous' discrete wavelet transform based algorithms for the fusion of multispectral and panchromatic images / M. Gonzalea-Audicana in International Journal of Remote Sensing IJRS, vol 26 n° 3 (February 2005)PermalinkEffect of Jpeg2000 on the information and geometry content of aerial photo compression / J.K. Liu in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 2 (February 2005)PermalinkQuality assessment and improvement of temporally composite products of remote sensed imagery by combination of Vegetation 1 and 2 images / Olivier Hagolle in Remote sensing of environment, vol 94 n° 2 (30/01/2005)Permalink3D building facade reconstruction under mesh form from multiple wide angle views / Lionel Pénard (2005)PermalinkApports des techniques de filtrage non linéaire pour la navigation avec les systèmes de navigation inertiels et le GPS / A. Giremus (2005)PermalinkAugmenting grid-based contours to improve thin-plate DEM generation / M.B. Gousie in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 1 (January 2005)PermalinkCalcul de l'allongement troposphérique via l'utilisation de cartes de l'ECMWF / Samuel Nahmani (2005)PermalinkCodage, adaptation et comparaison d'agorithmes de squelettisation d'une surface sur le SIG LAMPS2 / Christophe Mangeat (2005)PermalinkCollocation-based multiple reference station positioning using the covariance of the corrections / P. Alves in Geomatica, vol 59 n° 1 (January 2005)PermalinkDécomposition de signaux aléatoires stationnaires et non-stationnaires / Philippe Courmontagne (2005)PermalinkEin Beitrag zur Identifikation von dynamischen Strukturmodellen mit Methoden der adaptiven Kalman-Filterung / A. Eichhorn (2005)PermalinkEstimation of gravity wave momentum flux with spectroscopic imaging / J. 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