Several vegetation indices (VI) derived from handheld spectroradiometer reflectance data in the visible spectral region were tested for modelling grapevine water status estimated by the predawn leaf water potential (Ψpd). The experimental trial was carried out in a vineyard in Douro wine region, Portugal. A statistical approach was used to evaluate which VI and which combination of wavelengths per VI allows the best correlation between VIs and Ψpd. A linear regression was defined using a parameterization dataset. The correlation analysis between Ψpd and the VIs computed with the standard formulation showed relatively poor results, with values for squared Pearson correlation coefficient (r2) smaller than 0.67. However, the results of r2 highly improved for all VIs when computed with the selected best combination of wavelengths (optimal VIs). The optimal Visible Atmospherically Resistant Index (VARI) and Normalized Difference Greenness Vegetation Index (NDGI) showed the higher r2 and stability index results. The equations obtained through the regression between measured Ψpd (Ψpd_obs) and optimal VARI and between Ψpd_obs and optimal NDGI when using the parameterization dataset were adopted for predicting Ψpd using a testing dataset. The comparison of Ψpd_obs with Ψpd predicted based on VARI led to R2 = 0.79 and a regression coefficient b = 0.96. Similar R2 was achieved for the prediction based on NDGI, but b was smaller (b = 0.93). Results obtained allow the future use of optimal VARI and NDGI for estimating Ψpd, supporting vineyards irrigation management.
from #Medicine via ola Kala on Inoreader http://ift.tt/1IKe8BH
via IFTTT
Αρχειοθήκη ιστολογίου
-
►
2023
(138)
- ► Φεβρουαρίου (74)
- ► Ιανουαρίου (64)
-
►
2022
(849)
- ► Δεκεμβρίου (61)
- ► Σεπτεμβρίου (74)
- ► Φεβρουαρίου (65)
-
►
2021
(2936)
- ► Δεκεμβρίου (59)
- ► Σεπτεμβρίου (180)
- ► Φεβρουαρίου (325)
-
►
2020
(1624)
- ► Δεκεμβρίου (293)
- ► Σεπτεμβρίου (234)
- ► Φεβρουαρίου (28)
-
►
2019
(13362)
- ► Δεκεμβρίου (19)
- ► Σεπτεμβρίου (54)
- ► Φεβρουαρίου (5586)
- ► Ιανουαρίου (5696)
-
►
2018
(66471)
- ► Δεκεμβρίου (5242)
- ► Σεπτεμβρίου (5478)
- ► Φεβρουαρίου (4835)
- ► Ιανουαρίου (5592)
-
►
2017
(44259)
- ► Δεκεμβρίου (5110)
- ► Σεπτεμβρίου (5105)
-
►
2016
(7467)
- ► Δεκεμβρίου (514)
- ► Σεπτεμβρίου (1038)
- ► Φεβρουαρίου (793)
-
▼
2015
(2119)
-
▼
Δεκεμβρίου
(940)
-
▼
Δεκ 04
(44)
- Morphology, chemical composition and nanostructure...
- Evaluation of performance reference compounds (PRC...
- Novel behavior of the chromatographic separation o...
- Surface-imprinted magnetic particles for highly se...
- Optimized efficiency of mapping a site contaminate...
- Ultrasensitive electrospun fluorescent nanofibrous...
- Abdel El Manira elected in the Royal Swedish Acade...
- Sensors, Vol. 15, Pages 30736-30758: Portable Nano...
- Sensors, Vol. 15, Pages 30716-30735: The Bubble Bo...
- Water, Vol. 7, Pages 6931-6945: Uncertainty Analys...
- Water, Vol. 7, Pages 6910-6930: Modeling Typhoon‐I...
- Sensors, Vol. 15, Pages 30759-30783: A Hybrid Indo...
- Pathogens, Vol. 4, Pages 869-882: Coordinated Mole...
- Sustainability, Vol. 7, Pages 16260-16272: Hydroge...
- IJERPH, Vol. 12, Pages 15486-15497: Influenza Vacc...
- Beverages, Vol. 1, Pages 341-353: Performance of H...
- Mouse Models of DNA Mismatch Repair in Cancer Rese...
- Characterization of γδ T-cells via flow cytometry
- Remote Sensing, Vol. 7, Pages 16519-16536: The Spa...
- IJERPH, Vol. 12, Pages 15470-15485: “Grandma, You ...
- Remote Sensing, Vol. 7, Pages 16504-16518: The Man...
- Sensors, Vol. 15, Pages 30704-30715: Preconcentrat...
- Marine Drugs, Vol. 13, Pages 7285-7300: Isolation ...
- Marine Drugs, Vol. 13, Pages 7275-7284: Biotechnol...
- Sensors, Vol. 15, Pages 30693-30703: Corrosion Res...
- Remote Sensing, Vol. 7, Pages 16480-16503: A Hybri...
- Remote Sensing, Vol. 7, Pages 16460-16479: Predict...
- Remote Sensing, Vol. 7, Pages 16441-16459: Tempora...
- Energies, Vol. 8, Pages 13879-13893: Power Transmi...
- Marine Drugs, Vol. 13, Pages 7250-7274: Structure-...
- Energies, Vol. 8, Pages 13864-13878: Combustion an...
- Anatomy Of The Supraspinatus Muscle - Everything Y...
- Screening of HER2 Overexpressed Breast Cancer Subt...
- Solvatochromic Dyes as pH-Independent Indicators f...
- Real Time Online Correction of Mass Shifts and Int...
- THE TEAM From GOOD To GREAT! - Dr. Nabil Ebraheim
- Acute restraint stress induces specific changes in...
- Momordin Ic couples apoptosis with autophagy in hu...
- Nasal Wipes for Influenza A Virus Detection and Is...
- Exercise Protocol of Multisensory Rehabilitation i...
- Effect of Triple Combination of Induction, Concurr...
- Histology-Guided High-Resolution Matrix-Assisted L...
- Methods to Investigate the Regulatory Role of Smal...
- In Situ Mapping of the Mechanical Properties of Bi...
-
▼
Δεκ 04
(44)
-
▼
Δεκεμβρίου
(940)
Αναζήτηση αυτού του ιστολογίου
Παρασκευή 4 Δεκεμβρίου 2015
Remote Sensing, Vol. 7, Pages 16460-16479: Predicting Grapevine Water Status Based on Hyperspectral Reflectance Vegetation Indices
Εγγραφή σε:
Σχόλια ανάρτησης (Atom)
-
Αλέξανδρος Γ. Σφακιανάκης Medicine by Alexandros G. Sfakianakis,Anapafseos 5 Agios Nikolaos 72100 Crete Greece,00302841026182,0030693260717...
-
heory of COVID-19 pathogenesis Publication date: November 2020Source: Medical Hypotheses, Volume 144Author(s): Yuichiro J. Suzuki ScienceD...
-
Alimentary Pharmacology &Therapeutics, EarlyView. https://ift.tt/2qECBIJ
Δεν υπάρχουν σχόλια:
Δημοσίευση σχολίου
Σημείωση: Μόνο ένα μέλος αυτού του ιστολογίου μπορεί να αναρτήσει σχόλιο.