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Novasar: space-based radar for all / D. Willetts in GEO: Geoconnexion international, vol 11 n° 6 (june 2012)
[article]
Titre : Novasar: space-based radar for all Type de document : Article/Communication Auteurs : D. Willetts, Auteur Année de publication : 2012 Article en page(s) : pp 33 - 35 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] capteur imageur
[Termes IGN] capteur spatial
[Termes IGN] image radar moirée
[Termes IGN] radar à antenne synthétiqueRésumé : (Auteur) With ability to acquire data at a fraction of the cost of the conventional synthetic aperture radar sensors, NovaSar looks to support a wide variety of civil applications. Numéro de notice : A2012-272 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31718
in GEO: Geoconnexion international > vol 11 n° 6 (june 2012) . - pp 33 - 35[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 062-2012061 SL Revue Centre de documentation Revues en salle Disponible Parameterising internal camera geometry with focusing distance / E. Sanz-Ablanedo in Photogrammetric record, vol 27 n° 138 (June - August 2012)
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Titre : Parameterising internal camera geometry with focusing distance Type de document : Article/Communication Auteurs : E. Sanz-Ablanedo, Auteur ; Jim H. Chandler, Auteur ; R. Wackrow, Auteur Année de publication : 2012 Article en page(s) : pp 210 - 226 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] étalonnage de chambre métrique
[Termes IGN] étalonnage géométrique
[Termes IGN] longueur focale
[Termes IGN] orientation interne
[Termes IGN] photogrammétrie terrestreRésumé : (Auteur) A study on the variation of internal camera geometry (principal distance, principal point position and lens distortion parameters) with different focus distances has been conducted. Results demonstrate that variations of parameters are continuous and predictable, allowing a new way to describe internal camera geometry. The classical constant parameters, c, x p , y p , K 1 , K 2 , P 1 and P 2 , are replaced by continuous functions, c(y), x p (y), y p(y), K 1 (y), K 2 (y), P 1 (y) andP 2 (y), where y is a variable describing the focus position. Incorporation of y as a metadata tag (for example, Exif header) of a photograph jointly with a parameterised definition of camera geometry would allow full use of the autofocus camera function; enabling maximum effective depth of field, better match of the plane of focus with the object’s position and higher reliability. Additionally, conducted tests suggest the parameterised definition of internal geometry could help to locate and correct linear dependences between adjusted parameters, potentially improving the precision and accuracy of calibration. Numéro de notice : A2012-307 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2012.00677.x Date de publication en ligne : 20/06/2012 En ligne : https://doi.org/10.1111/j.1477-9730.2012.00677.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31753
in Photogrammetric record > vol 27 n° 138 (June - August 2012) . - pp 210 - 226[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 106-2012021 RAB Revue Centre de documentation En réserve L003 Disponible ESA's Soil Moisture and Ocean Salinity mission : mission performance and operations / S. Mecklenburg in IEEE Transactions on geoscience and remote sensing, vol 50 n° 5 Tome 1 (May 2012)
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Titre : ESA's Soil Moisture and Ocean Salinity mission : mission performance and operations Type de document : Article/Communication Auteurs : S. Mecklenburg, Auteur ; M. Drusch, Auteur ; Yann H. Kerr, Auteur ; J. Font, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 1354 - 1366 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] image SMOS
[Termes IGN] interférence
[Termes IGN] mission spatiale
[Termes IGN] performance
[Termes IGN] SMOS
[Termes IGN] température de luminanceRésumé : (Auteur) The European Space Agency's Soil Moisture and Ocean Salinity (SMOS) mission was launched on the 2nd of November 2009. The first six months after launch, the so-called commissioning phase, were dedicated to test the functionalities of the spacecraft, the instrument, and the ground segment including the data processors. This phase was successfully completed in May 2010, and SMOS has since been in the routine operations phase and providing data products to the science community for over a year. The performance of the instrument has been within specifications. A parallel processing chain has been providing brightness temperatures in near-real time to operational centers, e.g., the European Centre for Medium-Range Weather Forecasts. Data quality has been within specifications; however, radio-frequency interference (RFI) has been detected over large parts of Europe, China, Southern Asia, and the Middle East. Detecting and flagging contaminated observations remains a challenge as well as contacting national authorities to localize and eliminate RFI sources emitting in the protected band. The generation of Level 2 soil moisture and ocean salinity data is an ongoing activity with continuously improved processors. This article will summarize the mission status after one year of operations and present selected first results. Numéro de notice : A2012-205 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2012.2187666 Date de publication en ligne : 03/04/2012 En ligne : https://doi.org/10.1109/TGRS.2012.2187666 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31652
in IEEE Transactions on geoscience and remote sensing > vol 50 n° 5 Tome 1 (May 2012) . - pp 1354 - 1366[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-2012051A RAB Revue Centre de documentation En réserve L003 Disponible A first set of techniques to detect radio frequency interferences and mitigate their impact on SMOS data / R. Castro in IEEE Transactions on geoscience and remote sensing, vol 50 n° 5 Tome 1 (May 2012)
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Titre : A first set of techniques to detect radio frequency interferences and mitigate their impact on SMOS data Type de document : Article/Communication Auteurs : R. Castro, Auteur Année de publication : 2012 Article en page(s) : pp 1440 - 1447 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] détection automatique
[Termes IGN] détection du signal
[Termes IGN] image SMOS
[Termes IGN] interférenceRésumé : (Auteur) The presence of radio frequency interferences (RFIs) in the data collected by the Soil Moisture and Ocean Salinity (SMOS) mission led by the European Space Agency is larger than what was anticipated, and it has a strong impact on the retrieval of these geophysical parameters. The first efforts to deal with this problem were proposed by DEIMOS Engenharia in the Level 1 Prototype Processor released in November 2010, and they are also a part of its latest versions. DEIMOS focused on three key aspects to detect the RFIs, to mitigate these sources, and to flag the data in SMOS products affected by RFIs. The detection algorithm is based on a statistic approach that computes the most probable position of the RFI source based on multiangular observations made by SMOS. The mitigation algorithm has been designed taking as reference the existing technique to remove the sun effect. The mechanism to flag the data has been developed in cooperation with the European Space Agency and consists in flagging geolocated pixels according to the strength of the RFI. In this paper, three algorithms will be presented, as well as their results. For completion, a high-level description of the data processing for SMOS is also a part of this text. Numéro de notice : A2012-207 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2011.2179304 Date de publication en ligne : 16/01/2012 En ligne : https://doi.org/10.1109/TGRS.2011.2179304 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31654
in IEEE Transactions on geoscience and remote sensing > vol 50 n° 5 Tome 1 (May 2012) . - pp 1440 - 1447[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-2012051A RAB Revue Centre de documentation En réserve L003 Disponible Overview of the first SMOS sea surface salinity products. Part 1: quality assessment for the second half of 2010 / N. Reul in IEEE Transactions on geoscience and remote sensing, vol 50 n° 5 Tome 1 (May 2012)
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Titre : Overview of the first SMOS sea surface salinity products. Part 1: quality assessment for the second half of 2010 Type de document : Article/Communication Auteurs : N. Reul, Auteur ; J. Tenerelli, Auteur ; J. Boutin, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 1636 - 1647 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] eau de mer
[Termes IGN] image SMOS
[Termes IGN] qualité des données
[Termes IGN] salinité
[Termes IGN] température de luminanceRésumé : (Auteur) Multi-angular images of the brightness temperature (TB) of the Earth at 1.4 GHz are reconstructed from the Soil Moisture and Ocean Salinity (SMOS) satellite sensor data since end 2009. Sea surface salinity (SSS) products remote sensing from space is being attempted using these data over the world oceans. The quality of the first version of the European Space Agency operational Level 2 (L2) SSS swath products is assessed in this paper, using satellite/in situ SSS data match-ups that were collected over the second half of 2010. This database reveals that 95% of the SMOS L2 products show a global error standard deviation on the order of ~ 1.3 practical salinity scale. Simple spatiotemporal aggregation of the L2 products to generate monthly SSS maps at 1° x 1° spatial resolution reduces the error down to about 0.6 globally and 0.4 in the tropics for 90% of the data. Several major problems are, however, detected in the products. Systematically, SMOS SSS data are biased within a ~ 1500 km wide belt along the world coasts and sea ice edges, with a contamination intensity and spread varying from ascending to descending passes. Numerous world ocean areas are permanently or intermittently contaminated by radio-frequency interferences, particularly in the northern high latitudes and following Asia coastlines. Moreover, temporal drifts in the retrieved SSS fields are found with varying signatures in ascending and descending passes. In descending passes, a time-dependent strong latitudinal bias is found, with maximum amplitude reached at the end of the year. Errors in the forward modeling of the wind-induced emissivity and of the sea surface scattered galactic sources are as well identified, biasing the SSS retrievals at high and low winds and when the galactic equator sources are reflected toward the sensor. Numéro de notice : A2012-210 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2012.2188408 Date de publication en ligne : 23/03/2012 En ligne : https://doi.org/10.1109/TGRS.2012.2188408 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31657
in IEEE Transactions on geoscience and remote sensing > vol 50 n° 5 Tome 1 (May 2012) . - pp 1636 - 1647[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-2012051A RAB Revue Centre de documentation En réserve L003 Disponible Shooting between the clouds / Alistair Maclenan in GEO: Geoconnexion international, vol 11 n° 5 (may 2012)PermalinkL'image spatiale au niveau de la photo aérienne [Pléiades] / Laurent Polidori in Géomètre, n° 2091 (avril 2012)PermalinkImagery on call: Europe leads the way / Anonyme in GEO: Geoconnexion international, vol 11 n° 4 (april 2012)PermalinkMitigation of atmospheric perturbations and solid Earth movements in a TerraSAR-X time-series / D. Small in Journal of geodesy, vol 86 n° 4 (April 2012)PermalinkUAV flight over Singapore: a pilot study / Armin W. Gruen in Geoinformatics, vol 15 n° 3 (01/04/2012)PermalinkReview of developments in geometric modelling for high resolution satellite pushbroom sensors / Daniela Poli in Photogrammetric record, vol 27 n° 137 (March - May 2012)PermalinkAchieving big results from small sensors / A. Aflalo in GEO: Geoconnexion international, vol 11 n° 1 (january 2012)PermalinkPermalinkCalibration d’un système de numérisation mobile multi-caméras [diaporama] / Bertrand Cannelle (2012)PermalinkPléiades plus près, plus vite, plus précis : des demandes prioritaires / B. Thomas in CNES Mag, n° 52 (01/01/2012)Permalink