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DEM control in Arctic Alaska with Icesat laser altimetry / D.K. Atwood in IEEE Transactions on geoscience and remote sensing, vol 45 n° 11 Tome 2 (November 2007)
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Titre : DEM control in Arctic Alaska with Icesat laser altimetry Type de document : Article/Communication Auteurs : D.K. Atwood, Auteur ; R. Guritz, Auteur ; et al., Auteur Année de publication : 2007 Article en page(s) : pp 3710 - 3720 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] Alaska (Etats-Unis)
[Termes IGN] altimétrie satellitaire par laser
[Termes IGN] Arctique
[Termes IGN] Arctique, océan
[Termes IGN] données ICEsat
[Termes IGN] glaciologie
[Termes IGN] GPS en mode différentiel
[Termes IGN] image ERS-SAR
[Termes IGN] image radar moirée
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] modèle numérique de surface
[Termes IGN] point d'appui
[Termes IGN] positionnement différentielRésumé : (Auteur) Use of Ice, Cloud, and land Elevation Satellite (ICESat) laser altimetry is demonstrated for control of a digital elevation model (DEM) that is synthesized from repeat-pass ERS-1 and 2 synthetic aperture radar (SAR) imagery using interferometric SAR (InSAR). Our study area is 15650 km2 of the Barrow, AK coastal plain adjacent to the Arctic Ocean; a vast expanse of tundra, lakes, and arctic wetlands of such low relief as to be nearly devoid of terrain features. The accuracy of the ICESat-derived elevation measurements is assessed by comparison with differential global positioning system (DGPS) data acquired along ICESat ground tracks. The ICESat-derived elevations have a mean accuracy, relative to the DGPS elevations, of 0.01 +0.18 m. ICESat-derived elevations on the Arctic coastal plain provide an excellent source for DEM control. We employ the ICESat-derived ground control points (GCPs) in two distinct InSAR processing steps: 1) selected points are used to perform baseline refinements, which improves the ERS-1 and 2 interferograms and 2) the ICESat-derived GCP position data (latitude, longitude, elevation) are then used as control in mosaicking multiple InSAR-derived OEMs. The resulting ICESat-controlled DEM has a mean accuracy of-1.11 + 6.3m relative to an independent standard, which is a commercial airborne InSAR-derived DEM having 0.5 m rms accuracy. This easily meets DTED-2 standards and suggests that DEMs derived using only ICESat altimetry for ground control would meet similar standards in other regions of low relief. Copyright IEEE Numéro de notice : A2007-509 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2007.904335 En ligne : https://doi.org/10.1109/TGRS.2007.904335 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28872
in IEEE Transactions on geoscience and remote sensing > vol 45 n° 11 Tome 2 (November 2007) . - pp 3710 - 3720[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-07111B RAB Revue Centre de documentation En réserve L003 Disponible
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Titre : Le Mont-Blanc, chouchou des géomètres Type de document : Article/Communication Auteurs : Anonyme, Auteur Année de publication : 2007 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] Mont-Blanc, massif du
[Termes IGN] positionnement par GPSNuméro de notice : IFN_2153 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75729
in Géomatique expert > n° 59 (01/11/2007)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 265-07061 RAB Revue Centre de documentation En réserve L003 Disponible IFN-DIR-P000147 RAB Revue Nogent-sur-Vernisson En réserve L003 Exclu du prêt Short-term response of Arctic vegetation NDVI to temperature anomalies / I. Olthof in International Journal of Remote Sensing IJRS, vol 28 n° 21-22 (November 2007)
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Titre : Short-term response of Arctic vegetation NDVI to temperature anomalies Type de document : Article/Communication Auteurs : I. Olthof, Auteur ; R. Latifovic, Auteur Année de publication : 2007 Article en page(s) : pp 4823 - 4840 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] anomalie thermique
[Termes IGN] Arctique
[Termes IGN] Canada
[Termes IGN] changement climatique
[Termes IGN] détection de changement
[Termes IGN] Normalized Difference Vegetation Index
[Termes IGN] surveillance de la végétationRésumé : (Auteur) The effects of climate change on northern vegetation productivity need to be fully understood in order to reduce uncertainties in predicting vegetation distributions under different climate warming scenarios. Knowledge of the relationship between northern climate and vegetation productivity will also help provide a better understanding of changes in vegetation distributions as an indicator of climate change and variability. Vegetation productivity and biomass have been monitored using long-term satellite earth observations, mostly using the Normalized Difference Vegetation Index (NDVI), as a cumulative indicator of all effects resulting from processes related to climate change, including changes in temperature, precipitation, and disturbance. In this paper, the investigation is focused on the short-term effect of temperature anomalies on arctic and tree-line transition vegetation productivity in both dry and humid regions of Canada. The analysis shows that several land-cover types composed mainly of trees and shrubs exhibit a significant increase in NDVI with higher-than-normal temperatures in the preceding 10-40-day period, while land-cover types consisting of lichen and moss growing on mostly barren surfaces show a significant NDVI decrease with increased temperature. These trends are consistent with results reported in plot-warming experiments in the north, which have shown that certain vegetation communities increase, while others decrease in cover fraction and biomass in response to warming. When land cover is grouped into increasing and decreasing NDVI with temperature and stratified by dry and humid regions of Canada, much of the dry region of northern Canada does not exhibit significant NDVI response to preceding temperature anomalies. It is expected that in the absence of disturbance or other limiting factors, an increased frequency of elevated temperature anomalies may eventually contribute to changes in vegetation biomass. A map of land-cover types that have the potential to increase in biomass with climate warming and those that are vulnerable to decline is presented. Copyright Taylor & Francis Numéro de notice : A2007-491 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160701268996 En ligne : https://doi.org/10.1080/01431160701268996 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28854
in International Journal of Remote Sensing IJRS > vol 28 n° 21-22 (November 2007) . - pp 4823 - 4840[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 080-07121 RAB Revue Centre de documentation En réserve L003 Disponible Variability of fire-induced changes in MODIS surface reflectance by land-cover type in Borneo / Jukka Miettinen in International Journal of Remote Sensing IJRS, vol 28 n° 21-22 (November 2007)
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Titre : Variability of fire-induced changes in MODIS surface reflectance by land-cover type in Borneo Type de document : Article/Communication Auteurs : Jukka Miettinen, Auteur Année de publication : 2007 Article en page(s) : pp 4967 - 4984 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] analyse discriminante
[Termes IGN] Bornéo, île de
[Termes IGN] couvert végétal
[Termes IGN] image Aqua-MODIS
[Termes IGN] image Terra-MODIS
[Termes IGN] incendie de forêt
[Termes IGN] occupation du sol
[Termes IGN] réflectance de surface
[Termes IGN] réflectance spectrale
[Termes IGN] variabilitéRésumé : (Auteur) This study investigates fire-induced spectral changes detected by the Moderate Resolution Imaging Spectroradiometer (MODIS) in different land-cover types in Borneo. Linear discriminant analysis is used to determine the most powerful band combinations among the MODIS reflective bands for discrimination between burnt and unburnt areas in each land-cover type. The results show that the nature of fire-induced changes is dependent on pre-fire vegetation characteristics in this region. Bands 1 (0.64 um), 2 (0.86 um), and 7 (2.14 um) are found to be the most sensitive bands in land-cover types dominated by green vegetation, and consequently indices or combinations of indices using these three bands are potentially effective for burnt-area detection in the majority of areas. In land-cover types dominated by dry vegetation and soil, MODIS band 5 (1.24 um) alone showed the greatest statistical separability and could not be significantly improved by any multiband index. Copyright Taylor & Francis Numéro de notice : A2007-492 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160701268962 En ligne : https://doi.org/10.1080/01431160701268962 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28855
in International Journal of Remote Sensing IJRS > vol 28 n° 21-22 (November 2007) . - pp 4967 - 4984[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 080-07121 RAB Revue Centre de documentation En réserve L003 Disponible Comparison of ground-based GPS precipitable water vapour to independent observations and NWP model reanalyses over Africa / Olivier Bock in Quarterly Journal of the Royal Meteorological Society, vol 133 n° 629 (Octobre 2007 part B)
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Titre : Comparison of ground-based GPS precipitable water vapour to independent observations and NWP model reanalyses over Africa Type de document : Article/Communication Auteurs : Olivier Bock , Auteur ; Marie-Noëlle Bouin
, Auteur ; Andrea Walpersdorf, Auteur ; Jean-Philippe Lafore, Auteur ; Serge Janicot, Auteur ; Françoise Guichard, Auteur ; Anna Agusti-Panareda, Auteur
Année de publication : 2007 Article en page(s) : pp 2011 - 2027 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Afrique (géographie physique)
[Termes IGN] analyse comparative
[Termes IGN] cohérence des données
[Termes IGN] mousson
[Termes IGN] vapeur d'eauRésumé : (auteur) This study aims at assessing the consistency between different precipitable water vapour (PWV) datasets over Africa (between 35°N and 10°S). This region is characterized by large spatial and temporal variability of humidity but also by the scarcity of its operational observing network, limiting our knowledge of the hydrological cycle. We intercompare data from observing techniques such as ground-based Global Positioning System (GPS), radiosondes, AERONET sun photometers and SSM/I, as well as reanalyses from European Centre for Medium-Range Weather Forecasts (ERA-40) and National Center for Environmental Prediction (NCEP2). The GPS data, especially, are a new source of PWV observation in this region. PWV estimates from nine ground-based GPS receivers of the international GPS network data are used as a reference dataset to which the others are compared. Good agreement is found between observational techniques, though dry biases of 12–14% are evidenced in radiosonde data at three sites. Reasonable agreement is found between the observational datasets and ERA-40 (NCEP2) reanalyses with maximum bias ⩽9% (14%) and standard deviation ⩽17% (20%). Since GPS data were not assimilated in the ERA-40 and NCEP2 reanalyses, they allow for a fully independent validation of the reanalyses. They highlight limitations in the reanalyses, especially at time-scales from sub-daily to periods of a few days. This work also demonstrates the high potential of GPS PWV estimates over Africa for the analysis of the hydrological cycle, at time-scales ranging between sub-diurnal to seasonal. Such observations can help studying atmospheric processes targeted by the African Monsoon Multidisciplinary Analysis project. Numéro de notice : A2007-690 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1002/qj.185 Date de publication en ligne : 20/09/2007 En ligne : https://doi.org/10.1002/qj.185 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102776
in Quarterly Journal of the Royal Meteorological Society > vol 133 n° 629 (Octobre 2007 part B) . - pp 2011 - 2027[article] PermalinkCartographie des zones de haute montagne : essais de cartographie numérique des rochers / Loïc Gondol in Le monde des cartes, n° 193 (septembre - novembre 2007)
PermalinkOptimisation spatiale de la localisation d'un réseau de pistes pour l'accès aux ressources foncières / Wassim Jaziri in Revue internationale de géomatique, vol 17 n° 3-4 (septembre 2007 – février 2008)
PermalinkDual-frequency altimeter signal from Envisat on the Amery ice-shelf / Pascal Lacroix in Remote sensing of environment, vol 109 n° 3 (15 August 2007)
PermalinkAssessment of GPS data for meteorological applications over Africa: Study of error sources and analysis of positioning accuracy / Andrea Walpersdorf in Journal of Atmospheric and Solar-Terrestrial Physics, vol 69 n° 12 (August 2007)
PermalinkTerrestrial laser scanner to detect landslide displacement fields: a new approach / Giordano Teza in International Journal of Remote Sensing IJRS, vol 28 n°15-16 (August 2007)
PermalinkComparison and validation of MODIS and VEGETATION global LAI products over four BigFoot sites in North America / J. Pisek in Remote sensing of environment, vol 109 n° 1 (12 July 2007)
PermalinkThe 26 December 2004 tsunami measured by satellite altimetry / J. Gower in International Journal of Remote Sensing IJRS, vol 28 n° 13-14 (July 2007)
PermalinkCartographier la structure de la végétation forestière avec un système lidar aéroporté en terrain montagnard / L. Dorren in Revue Française de Photogrammétrie et de Télédétection, n° 186 (Juin 2007)
PermalinkDéveloppement d'un MNT du haut Rhône à partir de relevés bathymétriques réalisés avec un sondeur multifaisceaux / Hervé Pella in Revue Française de Photogrammétrie et de Télédétection, n° 186 (Juin 2007)
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