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An experimental study on content-based image classication for image databases / R.D. Holowczak in IEEE Transactions on geoscience and remote sensing, vol 40 n° 6 (June 2002)
[article]
Titre : An experimental study on content-based image classication for image databases Type de document : Article/Communication Auteurs : R.D. Holowczak, Auteur ; F.J. Artigas, Auteur ; S.A. Chunfang, Auteur ; J.S. Cho, Auteur ; H.S. Stone, Auteur Année de publication : 2002 Article en page(s) : pp 1338 - 1347 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] base de données d'images
[Termes IGN] classification dirigée
[Termes IGN] image NOAA-AVHRR
[Termes IGN] nébulosité
[Termes IGN] reconnaissance automatique
[Termes IGN] zone d'intérêtRésumé : (Auteur) Current art uses metadata associated with satellite images to facilitate their retrieval from image repositories. Typical metadata are geographic location, time, and data type. Because the metadata do not indicate which regions within an image are obscured by clouds, retrieval with such metadata may produce an image within which the region of interest (ROI) for the user is not visible. We report a system that can automatically determine whether an ROI is visible in the image, and can incorporate this into the metadata for individual images to enhance searching capability. The goal is to annotate each image with metadata regarding a number of ROIs. An experiment with the system annotated 236 advanced very high resolution radiometer (AVHRR) images of the North Atlantic from a flvemonth viewing period with descriptors that expressed the visibility of an ROI centered on Long Island, NY. For ground truth, we used the classifications of three human subjects to determine visibility of the same region of interest, and labeled the ROI with the majority decision of the three subjects. Partial cloud cover made the human determination subjective, and resulted in disagreements among the subjects. Using randomly selected training subsets of the images, we found the two images whose regions were most like those in images for which the Long Island region was visible. For training subsets, the descriptors derived from the two best images produced average recall and precision retrieval results jointly in the 75% to 80% region. Descriptors derived from those same two images for the test subsets also produced average recall and precision results that jointly fell in the 75% to 80% region. Numéro de notice : A2002-191 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2002.800751 Date de publication en ligne : 02/08/2002 En ligne : https://doi.org/10.1109/TGRS.2002.800751 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22106
in IEEE Transactions on geoscience and remote sensing > vol 40 n° 6 (June 2002) . - pp 1338 - 1347[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-02061 RAB Revue Centre de documentation En réserve L003 Disponible 065-02062 RAB Revue Centre de documentation En réserve L003 Disponible Basse résolution mais fréquence / Françoise de Blomac in SIG la lettre, n° 38 (juin 2002)
[article]
Titre : Basse résolution mais fréquence Type de document : Article/Communication Auteurs : Françoise de Blomac, Auteur Année de publication : 2002 Article en page(s) : pp 2 - 5 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Information géographique
[Termes IGN] image à basse résolution
[Termes IGN] image NOAA-AVHRR
[Termes IGN] image SPOT-Végétation
[Termes IGN] satellite d'observation de la Terre
[Termes IGN] télédétection spatialeRésumé : (Auteur) Les satellites d'observation de la Terre à basse résolution sont peu utilisés en SIG. Leur exploitation relève souvent d'un monde à part, soucieux de scruter la planète dans son ensemble ou de détecter rapidement des bancs de poissons. Pourtant, ils ne manquent pas d'intérêt. Les capteurs basse résolution - définir la limite entre très haute, haute, moyenne et basse résolution fait encore l'objet de discussions - offrent une fréquence de visite quasi quotidienne. De plus, souvent équipés de canaux infrarouges, ils aident à la compréhension de nombreux phénomènes tels que la vie végétale, les ressources en eau ou l'occupation du sol. C'est pourquoi scientifiques et sociétés de services n'hésitent plus à les utiliser, en conjonction avec d'autres données géographiques pour mener des analyses originales. Si NOAA et VEGETATION sont les noms les plus connus, d'autres capteurs sont aujourd'hui disponibles ou le seront demain. Ici, le marché s'étoffe et la concurrence fait rage ... Numéro de notice : A2002-126 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22041
in SIG la lettre > n° 38 (juin 2002) . - pp 2 - 5[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 286-02061 RAB Revue Centre de documentation En réserve L003 Disponible Fuzzy modelling of African ecoregions and ecotones using AVHRR NDVI temporal imagery / M. Ji in Geocarto international, vol 17 n° 1 (March - May 2002)
[article]
Titre : Fuzzy modelling of African ecoregions and ecotones using AVHRR NDVI temporal imagery Type de document : Article/Communication Auteurs : M. Ji, Auteur Année de publication : 2002 Article en page(s) : pp 21 - 30 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] Afrique (géographie politique)
[Termes IGN] écosystème
[Termes IGN] flore locale
[Termes IGN] image multibande
[Termes IGN] image multitemporelle
[Termes IGN] image NOAA-AVHRR
[Termes IGN] logique floue
[Termes IGN] modélisation
[Termes IGN] Normalized Difference Vegetation Index
[Termes IGN] télédétection spatialeRésumé : (Auteur) Conventional methods of deriving global or continental vegetation maps from the National Oceanic and Atmospheric Administration's (NOAA) Advanced Very High Resolution Radiometer (AVHRR) time series data are based on two-value Boolean logic, which cannot properly model the so-called ecotone, the transition zone between adjacent ecosystems. New methods and data models that have been developed on the basis of fuzzy logic to address the "mixedpixel " issue in multi-spectral imagery can also be used with multi-temporal imagery to handle the mixture of vegetation types within an ecotone. This study introduces the concept of semantic space and its transformation from spectral feature space, which utilizes a fuzzy logic approach to characterize the continuum of vegetation communities in the African continent from AVHRR multi-temporal (12 months for three years from 1986 to 1988) NDVI data. The fuzzy procedure was based an the Fuzzy c-Means (FCM) algorithm with significant modifications to improve processing speed for handling large volumes of data. A second-order mapping approach was also devised to explicitly represent subdominant vegetative coverage in ecotones and other heterogeneous regions. Comparisons between a Sub-Saharan African Vegetation Map compiled by the International Union for Conservation of Nature (IUCN) in 1986 and the maps derived from this study demonstrated that fuzzy modeling and classification might provide a better and more realistic representation of the vegetative characteristics of the region. Numéro de notice : A2002-121 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040208542222 En ligne : https://doi.org/10.1080/10106040208542222 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22036
in Geocarto international > vol 17 n° 1 (March - May 2002) . - pp 21 - 30[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 059-02011 RAB Revue Centre de documentation En réserve L003 Disponible Mapping potential risk of valley fever outbreaks in African savannas using vegetation index time series data / A. Anyamba in Photogrammetric Engineering & Remote Sensing, PERS, vol 68 n° 2 (February 2002)
[article]
Titre : Mapping potential risk of valley fever outbreaks in African savannas using vegetation index time series data Type de document : Article/Communication Auteurs : A. Anyamba, Auteur ; K.J. Linthicum, Auteur ; R. Mahoney, Auteur ; C.J. Tucker, Auteur ; P.W. Kelley, Auteur Année de publication : 2002 Article en page(s) : pp 137 - 146 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] Afrique subsaharienne
[Termes IGN] biotope
[Termes IGN] cartographie des risques
[Termes IGN] cartographie thématique
[Termes IGN] image NOAA-AVHRR
[Termes IGN] maladie tropicale
[Termes IGN] Normalized Difference Vegetation Index
[Termes IGN] prévention des risques
[Termes IGN] risque sanitaire
[Termes IGN] savane
[Termes IGN] zone à risqueRésumé : (Auteur) Rift Valley Fever (RVF) outbreaks in East Africa are closely coupled with above normal rainfall that is associated with the occurrence of the warm phase of the El Nino/Southern Oscillation (ENSO) phenomenon. Outbreaks elsewhere in central and southern Africa are also linked to elevated rainfall patterns. Major RVF activity has been reported to occur throughout much of sub-Saharan Africa, except in areas with extensive tropical forest. In this study we used normalized difference vegetation index (NDVI) time-series data derived from the Advanced Very High Resolution Radiometer (AVHHR) instrument on polar orbiting National Oceanographic and Atmospheric Administration (NOAA) satellites to map areas with a potential for an RVF outbreak. A 19-year NDVI climatology was created and used to discriminate between areas with tropical forest, savanna, and desert. Because most RVF outbreaks have occurred in regions dominated by savanna vegetation, we created a mask to identify those areas where RVF would likely occur within the savanna ecosystems. NDVI anomalies were then calculated for the entire time series from July 1981 to the July 2000. Subsequently, we developed a methodology that detects areas with persistent positive NDVI anomalies (greater than + 0.1 NDVI units) using a three-month moving window to flag regions at greatest risk. Algorithms were designed to account for periods of extended above normal NDVI (by inference rainfall) and to consider the complex life cycle of mosquitoes that maintain and transmit RVF virus to domestic animals and people. We present results for different ENSO warm- and cold-event periods. The results indicate that regions of potential outbreaks have occurred predominantly during warm ENSO events in East Africa and during cold ENSO events in southern Africa. Results provide a likely historical reconstruction of areas where RVF may have occurred during the last 19 years. There is a close agreement between confirmed. Numéro de notice : A2002-012 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans En ligne : https://www.asprs.org/wp-content/uploads/pers/2002journal/february/2002_feb_137- [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21929
in Photogrammetric Engineering & Remote Sensing, PERS > vol 68 n° 2 (February 2002) . - pp 137 - 146[article]Natural disaster monitoring by remote sensing in Hungary: waterlogging and floods in the 1998-2001 period / M. Lelkes (2001)
Titre : Natural disaster monitoring by remote sensing in Hungary: waterlogging and floods in the 1998-2001 period Type de document : Article/Communication Auteurs : M. Lelkes, Auteur ; G. Csornai, Auteur ; C. Wirnhardt, Auteur Editeur : Lisse et Amsterdam : Balkema (August Aimé) Année de publication : 2001 Conférence : EARSeL 2001, 21st international symposium, Observing our environment from space : news solutions for a new millennium 14/05/2001 16/05/2001 Paris France Importance : pp 259 - 264 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] cultures
[Termes IGN] Hongrie
[Termes IGN] image IRS
[Termes IGN] image Landsat-TM
[Termes IGN] image NOAA-AVHRR
[Termes IGN] inondation
[Termes IGN] prévention des risques
[Termes IGN] risque naturel
[Termes IGN] surveillance hydrologiqueRésumé : (Auteur) Natural disasters management can substantially be helped by remote sensing in many areas. Not only the objective documentation of the disasters can be done through the utilization of satellite data in many cases, but this technology also provides information for the planning, during the prevention, preparation period and also in the most serious time of the mitigation. Excessive and lacking water, that is flood, waterlog and draught are quite frequent in Hungary, but in the past decade their occurrence was remarkably higher. This paper shows examples, how remote sensing techniques can operationally be used in the combat, mitigation management at local and national levels. Numéro de notice : C2001-032 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Communication DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64940 Relationship between drought indicators based on remote sensing and forest fires incidence in Spain / Águeda Vázquez (2001)PermalinkAnalysis of the environment factors in forest wildfires in Aznalcollar and Sierra Bermeja / A.S. Redondo (31/05/1999)PermalinkDrought monitoring based on thermal and microwave satellite data / Katarzyna Dabrowska-Zielinska (31/05/1999)PermalinkForest and fire monitoring with NOAA AVHRR imagery in the central African Republic / I. El Ghazzawi (31/05/1999)PermalinkRemote sensing estimation of fuel moisture content / E. Chuvieco (31/05/1999)PermalinkTemperature maps obtained from satellite images for a forest wildfire temporal evolution analysis / A.S. Redondo (31/05/1999)PermalinkTowards an operational monitoring of drought conditions in Spain using satellite images / F. Gonzalez-Alonso (31/05/1999)PermalinkPermalinkPermalinkEtude des températures de l'air en fonction de l'occupation de surface, en combinant un modèle agro météorologique, des informations satellitaires et un SIG / N. Fijean (1997)Permalink