Search Results - "Tejada, P"

Mapping crop water stress index in a ‘Pinot-noir’ vineyard: comparing ground measurements with thermal remote sensing imagery from an unmanned aerial vehicle by Bellvert, J, Zarco-Tejada, P. J, Girona, J, Fereres, E

“…Characterizing the spatial variability in water status across vineyards is a prerequisite for precision irrigation. The crop water stress index (CWSI)…”
Get full text

Applicability and limitations of using the crop water stress index as an indicator of water deficits in citrus orchards by Gonzalez-Dugo, V., Zarco-Tejada, P.J., Fereres, E.

“…•The assessment of CWSI in citrus requires specific adjustments.•Oscillations in citrus canopy temperature might be considered to establish the…”
Get full text

Chlorophyll content estimation in an open-canopy conifer forest with Sentinel-2A and hyperspectral imagery in the context of forest decline by Zarco-Tejada, P.J., Hornero, A., Beck, P.S.A., Kattenborn, T., Kempeneers, P., Hernández-Clemente, R.

“…With the advent of Sentinel-2, it is now possible to generate large-scale chlorophyll content maps with unprecedented spatial and temporal resolution, suitable…”
Get full text

Relationships between net photosynthesis and steady-state chlorophyll fluorescence retrieved from airborne hyperspectral imagery by Zarco-Tejada, P.J., Catalina, A., González, M.R., Martín, P.

“…Previous studies have demonstrated the link between leaf chlorophyll fluorescence and photosynthesis, mainly at the leaf level and under controlled laboratory…”
Get full text

Estimating evaporation with thermal UAV data and two-source energy balance models by Hoffmann, H, Nieto, H, Jensen, R, Guzinski, R, Zarco-Tejada, P, Friborg, T

“…Estimating evaporation is important when managing water resources and cultivating crops. Evaporation can be estimated using land surface heat flux models and…”
Get full text

Estimating leaf carotenoid content in vineyards using high resolution hyperspectral imagery acquired from an unmanned aerial vehicle (UAV) by Zarco-Tejada, P.J., Guillén-Climent, M.L., Hernández-Clemente, R., Catalina, A., González, M.R., Martín, P.

“…► Carotene (Cx+c) content estimation was investigated using a micro-hyperspectral imager on board a UAV. ► The index R515/R570 is highly sensitive to Cx+c…”
Get full text

Assessing the impact of measurement errors in the calculation of CWSI for characterizing the water status of several crop species by Gonzalez-Dugo, V., Zarco-Tejada, P. J.

“…Canopy temperature is generally accepted as an indirect but rapid, accurate, and large-scale indicator of crop water status and is, therefore, proposed to…”
Get full text

Tree height quantification using very high resolution imagery acquired from an unmanned aerial vehicle (UAV) and automatic 3D photo-reconstruction methods by Zarco-Tejada, P.J., Diaz-Varela, R., Angileri, V., Loudjani, P.

“…•Tree height quantification was conducted in an olive orchard from UAV imagery.•A tree-level digital surface model was derived from VHR imagery.•The 3D…”
Get full text

Automatic identification of agricultural terraces through object-oriented analysis of very high resolution DSMs and multispectral imagery obtained from an unmanned aerial vehicle by Diaz-Varela, R.A., Zarco-Tejada, P.J., Angileri, V., Loudjani, P.

“…Agricultural terraces are features that provide a number of ecosystem services. As a result, their maintenance is supported by measures established by the…”
Get full text

Mapping canopy conductance and CWSI in olive orchards using high resolution thermal remote sensing imagery by Berni, J.A.J., Zarco-Tejada, P.J., Sepulcre-Cantó, G., Fereres, E., Villalobos, F.

“…The characterization of field properties related to water in heterogeneous open canopies is limited by the lack of spatial resolution of satellite-based…”
Get full text

High-resolution airborne hyperspectral and thermal imagery for early detection of Verticillium wilt of olive using fluorescence, temperature and narrow-band spectral indices by Calderón, R., Navas-Cortés, J.A., Lucena, C., Zarco-Tejada, P.J.

“…Verticillium wilt (VW) caused by the soil-borne fungus Verticillium dahliae Kleb, is the most limiting disease in all traditional olive-growing regions…”
Get full text

Seasonal stability of chlorophyll fluorescence quantified from airborne hyperspectral imagery as an indicator of net photosynthesis in the context of precision agriculture by Zarco-Tejada, P.J., González-Dugo, M.V., Fereres, E.

“…The seasonal stability of solar-induced chlorophyll fluorescence (SIF) vs field-measured leaf CO2 assimilation (A) was assessed over a period of 2years by…”
Get full text

Seasonal evolution of crop water stress index in grapevine varieties determined with high-resolution remote sensing thermal imagery by Bellvert, J, J. Marsal, J. Girona, P. J. Zarco-Tejada

“…The seasonal characterization of spatial variability in water requirements across and within vineyards could assist the viticulturist to fine-tune irrigation…”
Get full text

Understanding the temporal dimension of the red-edge spectral region for forest decline detection using high-resolution hyperspectral and Sentinel-2a imagery by Zarco-Tejada, P.J., Hornero, A., Hernández-Clemente, R., Beck, P.S.A.

“…The operational monitoring of forest decline requires the development of remote sensing methods that are sensitive to the spatiotemporal variations of pigment…”
Get full text

Detection of Xylella fastidiosa in almond orchards by synergic use of an epidemic spread model and remotely sensed plant traits by Camino, C., Calderón, R., Parnell, S., Dierkes, H., Chemin, Y., Román-Écija, M., Montes-Borrego, M., Landa, B.B., Navas-Cortes, J.A., Zarco-Tejada, P.J., Beck, P.S.A.

“…The early detection of Xylella fastidiosa (Xf) infections is critical to the management of this dangerous plan pathogen across the world. Recent studies with…”
Get full text

Spatio-temporal patterns of chlorophyll fluorescence and physiological and structural indices acquired from hyperspectral imagery as compared with carbon fluxes measured with eddy covariance by Zarco-Tejada, P.J., Morales, A., Testi, L., Villalobos, F.J.

“…This study provides insight into the assessment of the spatio-temporal trends of chlorophyll fluorescence, narrow-band physiological indices, and structural…”
Get full text

A PRI-based water stress index combining structural and chlorophyll effects: Assessment using diurnal narrow-band airborne imagery and the CWSI thermal index by Zarco-Tejada, P.J., González-Dugo, V., Williams, L.E., Suárez, L., Berni, J.A.J., Goldhamer, D., Fereres, E.

“…This work advances the evaluation and interpretation of the Photochemical Reflectance Index (PRI) as an indicator of water stress, over a range of canopy…”
Get full text

Modelling hyperspectral- and thermal-based plant traits for the early detection of Phytophthora-induced symptoms in oak decline by Hornero, A., Zarco-Tejada, P.J., Quero, J.L., North, P.R.J., Ruiz-Gómez, F.J., Sánchez-Cuesta, R., Hernandez-Clemente, R.

“…Holm oak decline is a complex phenomenon mainly influenced by the presence of Phytophthora cinnamomi and water stress. Plant functional traits (PTs) are…”
Get full text

Assessing vineyard condition with hyperspectral indices: Leaf and canopy reflectance simulation in a row-structured discontinuous canopy by Zarco-Tejada, P.J., Berjón, A., López-Lozano, R., Miller, J.R., Martín, P., Cachorro, V., González, M.R., de Frutos, A.

“…Methods for chlorosis detection and physiological condition monitoring in Vitis vinifera L. through accurate chlorophyll a and b content ( C ab) estimation at…”
Get full text

Divergent abiotic spectral pathways unravel pathogen stress signals across species by Zarco-Tejada, P. J., Poblete, T., Camino, C., Gonzalez-Dugo, V., Calderon, R., Hornero, A., Hernandez-Clemente, R., Román-Écija, M., Velasco-Amo, M. P., Landa, B. B., Beck, P. S. A., Saponari, M., Boscia, D., Navas-Cortes, J. A.

“…Plant pathogens pose increasing threats to global food security, causing yield losses that exceed 30% in food-deficit regions. Xylella fastidiosa ( Xf )…”
Get full text