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Monitoring water stress and fruit quality in an orange orchard under regulated deficit irrigation using narrow-band structural and physiological remote sensing indices / S. Stagakis in ISPRS Journal of photogrammetry and remote sensing, vol 71 (July 2012)
[article]
Titre : Monitoring water stress and fruit quality in an orange orchard under regulated deficit irrigation using narrow-band structural and physiological remote sensing indices Type de document : Article/Communication Auteurs : S. Stagakis, Auteur ; V. Gonzales-Dugo, Auteur ; P. Cid, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 47 - 61 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] Citrus sinensis
[Termes IGN] cultures irriguées
[Termes IGN] drone
[Termes IGN] image aérienne
[Termes IGN] image multibande
[Termes IGN] Séville
[Termes IGN] stress hydrique
[Termes IGN] vergerRésumé : (Auteur) This paper deals with the monitoring of water status and the assessment of the effect of stress on citrus fruit quality using structural and physiological remote sensing indices. Four flights were conducted over a citrus orchard in 2009 using an unmanned aerial vehicle (UAV) carrying a multispectral camera with six narrow spectral bands in the visible and near infrared. Physiological indices such as the Photochemical Reflectance Index (PRI570), a new structurally robust PRI formulation that uses the 515 nm as the reference band (PRI515), and a chlorophyll ratio (R700/R670) were compared against the Normalized Difference Vegetation Index (NDVI), Renormalized Difference Vegetation Index (RDVI) and Modified Triangular Vegetation Index (MTVI) canopy structural indices for their performance in tracking water status and the effects of sustained water stress on fruit quality at harvest. The irrigation setup in the commercial orchard was compared against a treatment scheduled to satisfy full requirements (based on estimated crop evapotranspiration) using two regulated deficit irrigation (RDI) strategies. The water status of the trees throughout the experiment was monitored with frequent field measurements of stem water potential (?x), while titratable acidity (TA) and total soluble solids (TSS) were measured at harvest on selected trees from each irrigation treatment. The high spatial resolution of the multispectral imagery (30 cm pixel size) enabled identification of pure tree crown components, extracting the tree reflectance from shaded, sunlit and aggregated pixels. The physiological and structural indices were then calculated from each tree at the following levels: (i) pure sunlit tree crown, (ii) entire crown, aggregating the within-crown shadows, and (iii) simulating a lower resolution pixel, including tree crown, sunlit and shaded soil pixels. The resulting analysis demonstrated that both PRI formulations were able to track water status, except when water stress altered canopy structure. In such cases, PRI570 was more affected than PRI515 by the structural changes caused by sustained water stress throughout the season. Both PRI formulations were proven to serve as pre-visual water stress indicators linked to fruit quality TSS and TA parameters (r2 = 0.69 for PRI515 vs TSS; r2 = 0.58 vs TA). In contrast, the chlorophyll (R700/R670) and structural indices (NDVI, RDVI, MTVI) showed poor relationships with fruit quality and water status levels (r2 = 0.04 for NDVI vs TSS; r2 = 0.19 vs TA). The two PRI formulations showed strong relationships with the field-measured fruit quality parameters in September, the beginning of stage III, which appeared to be the period most sensitive to water stress and the most critical for assessing fruit quality in citrus. Both PRI515 and PRI570 showed similar performance for the two scales assessed (sunlit crown and entire crown), demonstrating that within-crown component separation is not needed in citrus tree crowns where the shaded vegetation component is small. However, the simulation conducted through spatial resampling on tree + soil aggregated pixels revealed that the physiological indices were highly affected by soil reflectance and between-tree shadows, showing that for TSS vs PRI515 the relationship dropped from r2 = 0.69 to r2 = 0.38 when aggregating soil + crown components. This work confirms a previous study that demonstrated the link between PRI570, water stress, and fruit quality, while also making progress in assessing the new PRI formulation (PRI515), the within-crown shadow effects on the physiological indices, and the need for high resolution imagery to target individual tree crowns for the purpose of evaluating the effects of water stress on fruit quality in citrus. Numéro de notice : A2012-347 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2012.05.003 En ligne : https://doi.org/10.1016/j.isprsjprs.2012.05.003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31793
in ISPRS Journal of photogrammetry and remote sensing > vol 71 (July 2012) . - pp 47 - 61[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-2012051 SL Revue Centre de documentation Revues en salle Disponible Planimetría de la Iglesia Colegial del Divino Salvador de Sevilla / A. Almagro Gorbea (2008)
Titre : Planimetría de la Iglesia Colegial del Divino Salvador de Sevilla Titre original : [Planimétrie de l'Église Collégiale du Salvador Divin de Séville] Type de document : Monographie Auteurs : A. Almagro Gorbea, Auteur Editeur : Madrid : Consejo superior de investogaciones cientificas Année de publication : 2008 Importance : 8 p. Format : 60 x 40 cm + 20 planches, 1 fasc. ISBN/ISSN/EAN : 978-84-00-08679-4 Langues : Espagnol (spa) Descripteur : [Vedettes matières IGN] Photogrammétrie terrestre
[Termes IGN] église
[Termes IGN] Espagne
[Termes IGN] photogrammétrie terrestre
[Termes IGN] SévilleRésumé : (Auteur) En septiembre de 2003 dieron comienzo las obras de restauración de la Iglesia Colegial del Divino Salvador de Sevilla con el objetivo de subsanar algunos problemas estructurales y, sobre todo, devolver al templo todo su esplendor. Desde un primer momento, los responsables de estos trabajos se plantearon la necesidad de realizar una documentación adecuada del monumento, tanto de las zonas visibles como de las que pudieran descubrirse, ya que se preveía realizar excavaciones arqueológicas en el subsuelo. Con este fin, el Arzobispado de Sevilla, a través del delegado para la restauración del templo del Salvador, encomendó a la Escuela de Estudios Árabes del Consejo Superior de Investigaciones Científicas la realización de un levantamiento del edifico mediante el uso de técnicas fotogramétricas. El levantamiento representa en su generalidad el estado del interior de la iglesia al iniciarse las labores de restauración, momento en que se tomaron las fotografías que han permitido su medición y dibujo. Los trabajos de levantamiento han incluido el registro de los hallazgos arqueológicos aparecidos en el subsuelo de la iglesia y que corresponden a la antigua mezquita mayor de Sevilla. Numéro de notice : 10525 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62463 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 10525-01 133.70 Livre Centre de documentation En réserve L-101 Exclu du prêt Analysis of the environment factors in forest wildfires in Aznalcollar and Sierra Bermeja / A.S. Redondo (31/05/1999)
contenu dans Remote sensing in the 21st century : economic and environmental applications / José Luis Casanova (2000)
Titre : Analysis of the environment factors in forest wildfires in Aznalcollar and Sierra Bermeja Type de document : Article/Communication Auteurs : A.S. Redondo, Auteur ; J.V. Giraldez Cervera, Auteur Editeur : Lisse et Amsterdam : Balkema (August Aimé) Année de publication : 31/05/1999 Conférence : EARSeL 1999, 19th symposium, Remote sensing in the 21st century : economic and environmental applications 31/05/1999 02/06/1999 Valladolid Espagne Importance : pp 343 - 348 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] Andalousie
[Termes IGN] écosystème
[Termes IGN] image NOAA-AVHRR
[Termes IGN] incendie de forêt
[Termes IGN] Normalized Difference Vegetation Index
[Termes IGN] pente
[Termes IGN] risque naturel
[Termes IGN] Séville
[Termes IGN] température de l'air
[Termes IGN] ventRésumé : (Auteur) Different natural factors make the Mediterranean ecosystem specially vulnerable to forest wildfires: the weather, with extremely long dry summers; the strong winds, which dry the soil and vegetation and spread the fire once it has begun; the abrupt topography and finally, the human factor. In late spring, May 30 to June 4 in 1995, a wildfire broke burning an area of 1800 ha called "EI Madrofialejo" (Sevilla). This area is characterized for his rough topography, with deep narrow valleys. One month and half later, an area of 1500 ha of forest was burnt in Sierra Benneja, (Malaga). The development of temperature and vegetation index maps from the daily NOAAAVHRR sensor databases, and the synoptical meteorological maps analysis, enable the study of increase in temperature and the NDVI decrease of the previous days and during the fire, as well as the climatic conditions of those dates. Numéro de notice : C1999-042 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Communication Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=65808