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Sparse representation of GPR traces with application to signal classification / Wenbin Shao in IEEE Transactions on geoscience and remote sensing, vol 51 n° 7 Tome 1 (July 2013)
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Titre : Sparse representation of GPR traces with application to signal classification Type de document : Article/Communication Auteurs : Wenbin Shao, Auteur ; Abdesselam Bouzerdoum, Auteur ; Son Lam Phung, Auteur Année de publication : 2013 Article en page(s) : pp 3922 - 3930 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] écho radar
[Termes IGN] filtre de Gabor
[Termes IGN] radar pénétrant GPRRésumé : (Auteur) Sparse representation (SR) models a signal with a small number of elementary waves using an overcomplete dictionary. It has been employed for a wide range of signal and image processing applications, including denoising, deblurring, and compression. In this paper, we present an adaptive SR method for modeling and classifying ground penetrating radar (GPR) signals. The proposed method decomposes each GPR trace into elementary waves using an adaptive Gabor dictionary. The sparse decomposition is used to extract salient features for SR and classification of GPR signals. Experimental results on real-world data show that the proposed sparse decomposition achieves efficient signal representation and yields discriminative features for pattern classification. Numéro de notice : A2013-370 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2012.2228660 En ligne : https://doi.org/10.1109/TGRS.2012.2228660 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32508
in IEEE Transactions on geoscience and remote sensing > vol 51 n° 7 Tome 1 (July 2013) . - pp 3922 - 3930[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-2013071A RAB Revue Centre de documentation En réserve L003 Disponible Ambiguity resolution for triple-frequency geometry-free and ionosphere-free combination tested with real data / K. Wang in Journal of geodesy, vol 87 n° 6 (June 2013)
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Titre : Ambiguity resolution for triple-frequency geometry-free and ionosphere-free combination tested with real data Type de document : Article/Communication Auteurs : K. Wang, Auteur ; Markus Rothacher, Auteur Année de publication : 2013 Article en page(s) : pp 539 - 553 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] combinaison linéaire
[Termes IGN] filtrage du bruit
[Termes IGN] mesurage de la fréquence
[Termes IGN] phase GNSS
[Termes IGN] résolution d'ambiguïté
[Termes IGN] signal BeiDou
[Termes IGN] signal Galileo
[Termes IGN] signal GNSSRésumé : (Auteur) The recent GPS Block IIF satellites SVN62 and SVN63 and the Galileo satellites GIOVE-A, GIOVE-B, PFM and FM2 already send signals on more than two frequencies, and more GNSS satellites will provide tracking data on at least three frequencies in the near future. In this paper, a simplified general method for ambiguity resolution minimizing the noise level for the triple-frequency geometry-free (GF) and ionosphere-free (IF) linear combinations is presented, where differently scaled code noise on the three frequencies was introduced. For the third of three required linear combinations, the most demanding one in triple-frequency ambiguity resolution, we developed a general method using the ambiguity-corrected phase observations without any constraints to search for the optimal GF and IF linear combination. We analytically demonstrate that the noise level of this third linear combination only depends on the three frequencies. The investigation concerning this frequency-dependent noise factor was performed for GPS, Galileo and Compass frequency triplets. We verified the theoretical derivations with real triple-frequency GPS and Galileo data from the Multi-GNSS Experiment (M–GEX) of the International GNSS Service (IGS). The data of about 30 M–GEX stations around the world over 11 days from 29 April 2012 to 9 May 2012 were used for the test. For the third linear combinaton using Galileo E1, E5b and E5a, which is expected to have the worst performance among all the GNSS frequency triplets in our investigation, the formal errors of the estimated ambiguities are in most cases below 0.2 cycles after 400 observation epochs. If more GPS satellites sending signals on three frequencies or more stations tracking Galileo E6 signal are available in the future, an improvement by a factor of two to three can be expected. Numéro de notice : A2013-339 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-013-0630-7 Date de publication en ligne : 09/04/2013 En ligne : https://doi.org/10.1007/s00190-013-0630-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32477
in Journal of geodesy > vol 87 n° 6 (June 2013) . - pp 539 - 553[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2013061 SL Revue Centre de documentation Revues en salle Disponible Derivation of tree skeletons and error assessment using LiDAR point cloud data of varying quality / Magnus Bremer in ISPRS Journal of photogrammetry and remote sensing, vol 80 (June 2013)
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Titre : Derivation of tree skeletons and error assessment using LiDAR point cloud data of varying quality Type de document : Article/Communication Auteurs : Magnus Bremer, Auteur ; Martin Rutzinger, Auteur ; V. Wichmann, Auteur Année de publication : 2013 Article en page(s) : pp 39 - 50 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] arbre (flore)
[Termes IGN] artefact
[Termes IGN] données lidar
[Termes IGN] semis de points
[Termes IGN] squelettisation
[Termes IGN] vecteur propreRésumé : (Auteur) The architecture of trees is of particular interest for 3D model creation in forestry and ecolocical applications. Terrestrial (TLS) and mobile laser scanning (MLS) systems are used to acquire detailed geometrical data of trees. Since 3D point clouds from laser scanning consist of large data amounts representing uninterpreted topographical information including noise and data gaps, an extraction of salient tree structures is important for further applications. We present a fully automated modular workflow for topological reliable reconstruction of tree architecture. Object-based point cloud processing such as branch extraction is combined with tree skeletonization. Branch extraction is performed using a segmentation procedure followed by segment-based analysis of form indices derived from eigenvector metrics. Extracted branch primitives are simplified and connected to line features during skeletonization. The modular workflow allows comprehensive parameter tests and error assessments that are used for a calibration of the module parameters with respect to various characteristics of the input data (e.g noise, scanning resolution, and the number of scan positions). The estimated parameter settings are validated using an exemplary MLS data set. The quality of input point cloud data, strongly influencing the quality of the skeleton results, can be improved by the presented branch extraction procedure. The potential for data improvement increases with increasing point densities. For our object-based appoach, we can show that the presence of erroneous structures and filtering artifacts have the strongest influence onto the quality of the derived skeletons. In contrast to traditional skeletonization approaches, the existance of data gaps has less influence onto the results. Numéro de notice : A2013-297 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2013.03.003 En ligne : https://doi.org/10.1016/j.isprsjprs.2013.03.003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32435
in ISPRS Journal of photogrammetry and remote sensing > vol 80 (June 2013) . - pp 39 - 50[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-2013061 RAB Revue Centre de documentation En réserve L003 Disponible Élaboration de la cartographie des échos du sol d’un radar météorologique à l’aide du modèle numérique de terrain (SRTM) / Abdenasser Djafri in Revue internationale de géomatique, vol 23 n° 2 (juin - aout 2013)
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Titre : Élaboration de la cartographie des échos du sol d’un radar météorologique à l’aide du modèle numérique de terrain (SRTM) Titre original : Simulation of meteorological radar ground echoes by SRTM DEM Type de document : Article/Communication Auteurs : Abdenasser Djafri, Auteur ; Boualem Haddad, Auteur Année de publication : 2013 Article en page(s) : pp 175 - 197 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] Algérie
[Termes IGN] Bordeaux
[Termes IGN] Dakar (Sénégal)
[Termes IGN] écho radar
[Termes IGN] fouillis d'échos
[Termes IGN] MNS SRTM
[Termes IGN] précipitation
[Termes IGN] radarRésumé : (Auteur) Ce papier porte sur l’élaboration de la cartographie des échos fixes du sol pour les radars météorologiques. Pour ce faire, nous avons utilisé le MNT (Modèle numérique de terrain) SRTM (Shuttle Radar Topography Mission) que nous avons extrait en appliquant le logiciel Radio-Mobile. Nous avons considéré trois sites radars météorologiques, à savoir, Sétif (Algérie), Bordeaux (France) et Dakar (Sénégal). Le calcul de l’erreur relative entre la surface des échos parasites simulés par le logiciel Radio-Mobile et celle obtenue en temps clair vaut 5,5 % pour Sétif, 7,2 % pour Bordeaux et 10,2 % pour Dakar. Aussi, nous avons développé un algorithme pour prendre en considération la non-homogénéité de l’atmosphère. Compte tenu de cette nouvelle approche, l’erreur est réduite de 0,7 % pour Sétif, 3,7 % pour Bordeaux et 8 % pour Dakar. De même, le coefficient de corrélation liant les pixels des échos simulés et observés en temps clair a été calculé et varie entre 89 % et 96 % montrant la forte intensité existant entre les deux types d’échos considérés. Numéro de notice : A2013-357 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.3166/rig.23.175-197 En ligne : https://doi.org/10.3166/rig.23.175-197 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32495
in Revue internationale de géomatique > vol 23 n° 2 (juin - aout 2013) . - pp 175 - 197[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 047-2013021 SL Revue Centre de documentation Revues en salle Disponible Improved topographic mapping through high-resolution SAR interferometry with atmospheric effect removal / Mingsheng Liao in ISPRS Journal of photogrammetry and remote sensing, vol 80 (June 2013)
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Titre : Improved topographic mapping through high-resolution SAR interferometry with atmospheric effect removal Type de document : Article/Communication Auteurs : Mingsheng Liao, Auteur ; Houjun Jiang, Auteur ; Yong Wang, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 72 - 79 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] bande X
[Termes IGN] cartographie topographique
[Termes IGN] Chine
[Termes IGN] effet atmosphérique
[Termes IGN] erreur en altitude
[Termes IGN] filtre passe-bas
[Termes IGN] image à haute résolution
[Termes IGN] image Cosmo-Skymed
[Termes IGN] image radar moirée
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] MNS SRTM
[Termes IGN] modèle numérique de terrain
[Termes IGN] régression linéaireRésumé : (Auteur) The application of SAR interferometry (InSAR) in topographic mapping is usually limited by geometric/temporal decorrelations and atmospheric effect, particularly in repeat-pass mode. In this paper, to improve the accuracy of topographic mapping with high-resolution InSAR, a new approach to estimate and remove atmospheric effect has been developed. Under the assumptions that there was no ground deformation within a short temporal period and insignificant ionosphere interference on high-frequency radar signals, e.g. X-bands, the approach was focused on the removal of two types of atmospheric effects, namely tropospheric stratification and turbulence. Using an available digital elevation model (DEM) of moderate spatial resolution, e.g. Shuttle Radar Topography Mission (SRTM) DEM, a differential interferogram was firstly produced from the high-resolution InSAR data pair. A linear regression model between phase signal and auxiliary elevation was established to estimate the stratified atmospheric effect from the differential interferogram. Afterwards, a combination of a low-pass and an adaptive filter was employed to separate the turbulent atmospheric effect. After the removal of both types of atmospheric effects in the high-resolution interferogram, the interferometric phase information incorporating local topographic details was obtained and further processed to produce a high-resolution DEM. The feasibility and effectiveness of this approach was validated by an experiment with a tandem-mode X-band COSMO-SkyMed InSAR data pair covering a mountainous area in Northwestern China. By using a standard Chinese national DEM of scale 1:50,000 as the reference, we evaluated the vertical accuracy of InSAR DEM with and without atmospheric effects correction, which shows that after atmospheric signal correction the root-mean-squared error (RMSE) has decreased from 13.6 m to 5.7 m. Overall, from this study a significant improvement to derive topographic maps with high accuracy has been achieved by using the proposed approach. Numéro de notice : A2013-298 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2013.03.008 En ligne : https://doi.org/10.1016/j.isprsjprs.2013.03.008 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32436
in ISPRS Journal of photogrammetry and remote sensing > vol 80 (June 2013) . - pp 72 - 79[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-2013061 RAB Revue Centre de documentation En réserve L003 Disponible Superresolution multitarget parameter estimation in MIMO radar / Kai Luo in IEEE Transactions on geoscience and remote sensing, vol 51 n° 6 Tome 2 (June 2013)
PermalinkMUSTER, a collaborative GNSS receiver architecture for weak signal processing / Andrey Soloviev in Inside GNSS, vol 8 n° 3 (May - June 2013)
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PermalinkTime-reversal-based multipath mitigation technique for ISAR images / Imanol Arriba-Ruiz in IEEE Transactions on geoscience and remote sensing, vol 51 n° 5 Tome 2 (May 2013)
PermalinkDescription de la campagne aéroportée UMBRA : étude de l'impact anthropique sur les écosystèmes urnbains et naturels avec des images THR multispectrales et hyperspectrales / Karine R.M. Adeline in Revue Française de Photogrammétrie et de Télédétection, n° 202 (Avril 2013)
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PermalinkDORIS and GPS monitoring of the Gavdos calibration site in Crete / Pascal Willis in Advances in space research, vol 51 n° 8 (April 2013)
PermalinkEvaluation of different methods to retrieve the hemispherical downwelling irradiance in the thermal infrared region for field measurements / Vicente Garcia-Santos in IEEE Transactions on geoscience and remote sensing, vol 51 n° 4 Tome 2 (April 2013)
PermalinkFast error analysis of continuous GNSS observations with missing data / M.S. Bos in Journal of geodesy, vol 87 n° 4 (April 2013)
PermalinkMultiple-spectral-band CRFs for denoising junk bands of hyperspectral imagery / Ping Zhong in IEEE Transactions on geoscience and remote sensing, vol 51 n° 4 Tome 2 (April 2013)
PermalinkAre numerical weather model outputs helpful to reduce tropospheric delay signals in InSAR data? / Youhei Kinoshita in Journal of geodesy, vol 87 n° 3 (March 2013)
PermalinkEvaluation of the ITRF2008 GPS vertical velocities using satellite antenna z-offsets / Xavier Collilieux in GPS solutions, vol 17 n° 2 (April 2013)
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