Filters








117 Hits in 5.8 sec

Hyperspectral Reflectance Characteristics of Rice Canopies under Changes in Diffuse Radiation Fraction

Tao Zhang, Xiaodong Jiang, Linlin Jiang, Xuran Li, Shenbin Yang, Yingxue Li
2022 Remote Sensing  
To analyze the hyperspectral reflectance characteristics of rice canopies under changes in diffuse radiation fraction, experiments using different cover materials were performed in Nanjing, China, during  ...  On the other hand, under shading treatment, the increase in diffuse radiation fraction also had a significant impact on the hyperspectral spectra of the rice canopy, especially at 14 days after heading  ...  Conclusions In this paper, we analyzed the changes of SPAD, LAI, and canopy spectral characteristics of rice under increasing diffuse radiation fraction.  ... 
doi:10.3390/rs14020285 fatcat:hq5sslqkerbh5gksw74zkank6a

Empirical Regression Models for Estimating Multiyear Leaf Area Index of Rice from Several Vegetation Indices at the Field Scale

Masayasu Maki, Koki Homma
2014 Remote Sensing  
In particular, the performance of a vegetation index known as time-series index of plant structure (TIPS), which was developed by the authors, was evaluated by comparison with other well-known vegetation  ...  Previous reports have shown that LAI derived from remote sensing data can be effectively applied in crop growth simulation models for improving the accuracy of grain yield estimation.  ...  Acknowledgments This work was supported in part by Japan Society for the Promotion of Science KAKENHI Grant NO. 23780263 and in part by the Global COE Program -Global Center for Education and Research  ... 
doi:10.3390/rs6064764 fatcat:7gdaqrikkvcbnbczor57z6il4u

Comparison of Absorbed and Intercepted Fractions of PAR for Individual Trees Based on Radiative Transfer Model Simulations

Wojciech Wojnowski, Shanshan Wei, Wenjuan Li, Tiangang Yin, Xian-Xiang Li, Genevieve Lai Fern Ow, Mohamed Lokman Mohd Yusof, Andrew J. Whittle
2021 Remote Sensing  
The fraction of absorbed photosynthetically active radiation (fAPAR) is a key parameter for estimating the gross primary production (GPP) of trees.  ...  For continuous, dense forest canopies, fAPAR, is often equated with the intercepted fraction, fIPAR.  ...  However, at the scale of vegetation canopies the effect of solar radiation on photosynthesis is more complex due to the differences in irradiance between direct and diffused solar radiation [16] , and  ... 
doi:10.3390/rs13061069 fatcat:ipd6lhvklrhptgevgt4c325kki

Evaluation of the PROSAIL Model Capabilities for Future Hyperspectral Model Environments: A Review Study

Katja Berger, Clement Atzberger, Martin Danner, Guido D'Urso, Wolfram Mauser, Francesco Vuolo, Tobias Hank
2018 Remote Sensing  
radiation with the vegetation canopy, see [7] [8] [9] [10] .  ...  ., [15] ) describe the radiation regime in vegetated canopies most closely to reality. Obviously, these models are the most complex and computationally-intensive.  ...  The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.  ... 
doi:10.3390/rs10010085 fatcat:6pepgyohvnhoredguwdyvn6xtq

High-Throughput Phenotyping: A Platform to Accelerate Crop Improvement

Sumit Jangra, Vrantika Chaudhary, Ram C. Yadav, Neelam R. Yadav
2021 Phenomics  
These technologies provide precise measurements of desired traits among thousands of field-grown plants under diversified environments; this is a critical step towards selection of better performing lines  ...  Development of high-throughput phenotyping technologies has progressed considerably in the last 10 years.  ...  A fraction of light that is reflected back from the irradiated light is defined as leaf reflectance.  ... 
doi:10.1007/s43657-020-00007-6 fatcat:kfqiivoas5hsjkjbfcha5546vq

Evaluating Leaf and Canopy Reflectance of Stressed Rice Plants to Monitor Arsenic Contamination

Varaprasad Bandaru, Craig Daughtry, Eton Codling, David Hansen, Susan White-Hansen, Carrie Green
2016 International Journal of Environmental Research and Public Health  
Results suggest that plants accumulate high arsenic amounts causing plant stress and changes in reflectance characteristics.  ...  This study evaluated the feasibility of using reflectance spectroscopy to monitor arsenic in rice plants.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/ijerph13060606 pmid:27322304 pmcid:PMC4924063 fatcat:grpn7eusijfhrikoa6jwzoqcn4

Field Measurements of Canopy Spectra for Biomass Assessment of Small-Grain Cereals [chapter]

Conxita Royo, Dolors Villegas
2011 Biomass - Detection, Production and Usage  
Relation of agronomic and multispectral reflectance characteristics of spring wheat canopies.  ...  Thus, the crop dry weight of a crop canopy at a given moment (t) may be expressed as a function of the incident radiation (Io), the fraction of the radiation intercepted by the crop canopy (FPAR), and  ...  Field Measurements of Canopy Spectra for Biomass Assessment of Small-Grain Cereals, Biomass -Detection, Production and Usage, Dr.  ... 
doi:10.5772/17745 fatcat:7sjg3t4wdnbvbkz4fixu4cswsa

Estimation of Maize Photosynthesis Traits Using Hyperspectral Lidar Backscattered Intensity

Kaiyi Bi, Zheng Niu, Shunfu Xiao, Jie Bai, Gang Sun, Ji Wang, Zeying Han, Shuai Gao
2021 Remote Sensing  
As a novel technique, hyperspectral lidar (HSL) has the potential to characterize the spatial distribution of plant photosynthesis traits under less confounding factors.  ...  In this paper, HSL reflectance spectra of maize leaves were utilized for estimating the maximal velocity of Rubisco carboxylation (Vcmax) and maximum rate of electron transport at a specific light intensity  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/rs13214203 fatcat:qdhqb4ye65ei7i5razunt6sxge

Effects of varying solar-view geometry and canopy structure on solar-induced chlorophyll fluorescence and PRI

Khelvi Biriukova, Marco Celesti, Anton Evdokimov, Javier Pacheco-Labrador, Tommaso Julitta, Mirco Migliavacca, Claudia Giardino, Franco Miglietta, Roberto Colombo, Cinzia Panigada, Micol Rossini
2020 International Journal of Applied Earth Observation and Geoinformation  
Photochemical Reflectance Index, PRI) acquired with high temporal (sub-minute) frequencies is foreseen to allow tracking of the structural and physiological changes of vegetation in a variety of ecosystems  ...  The PRI exhibited similar response due to its sensitivity to sunlit-shaded canopy fractions.  ...  We thank Martina Anelli, Mirco Boschetti, Gabriele Candiani and Giulia Tagliabue for their support during the campaign in Braccagni; Valentina Picchi for the extraction of chlorophyll content of alfalfa  ... 
doi:10.1016/j.jag.2020.102069 fatcat:t7hn62qqlrdnlerpi62n3d6zwq

Estimating rice chlorophyll content and leaf nitrogen concentration with a digital still color camera under natural light

Yuan Wang, Dejian Wang, Peihua Shi, Kenji Omasa
2014 Plant Methods  
In our study, a digital still color camera was used to take pictures of the canopies of 6 rice (Oryza sativa L.) cultivars with N treatments ranging from 0 to 315 kg N ha −1 in the field under sunny and  ...  The establishment of the relationship between image color indices and N status under natural light is important for crop monitoring and N diagnosis in the field.  ...  The authors acknowledge John Angus of CSIRO Agriculture for his constructive comments and revisions of the manuscript.  ... 
doi:10.1186/1746-4811-10-36 pmid:25411579 pmcid:PMC4236477 fatcat:2ddwqzmt2ne2jpn5oc4tyohkse

Photosynthesis in a Changing Global Climate: Scaling Up and Scaling Down in Crops

Marouane Baslam, Toshiaki Mitsui, Michael Hodges, Eckart Priesack, Matthew T. Herritt, Iker Aranjuelo, Álvaro Sanz-Sáez
2020 Frontiers in Plant Science  
Photosynthesis is the major process leading to primary production in the Biosphere. There is a total of 7000bn tons of CO2 in the atmosphere and photosynthesis fixes more than 100bn tons annually.  ...  This wealth of data is being incorporated into new modeling algorithms to predict plant growth and development under specific environmental constraints.  ...  Use of Hyperspectral Reflectance Technology to Estimate Gas Exchange Parameters Hyperspectral sensors capture electromagnetic radiation reflected from vegetation in the visible (VIS, 400-700 nm), nearinfrared  ... 
doi:10.3389/fpls.2020.00882 pmid:32733499 pmcid:PMC7357547 fatcat:smtufx2xw5g4jirhagbnr7y77i

Estimating regional heavy metal concentrations in rice by scaling up a field-scale heavy metal assessment model

Meiling Liu, Xiangnan Liu, Jonathan Li, Ting Li
2012 International Journal of Applied Earth Observation and Geoinformation  
The objective of this study was to determine the levels of heavy metals cadmium (Cd) and copper (Cu) in rice by upscaling a field-scale heavy metal assessment (FHMA) model from field to regional scale.  ...  In addition, the network structure and fuzzy rules, which had already been developed in the FHMA model, would be subsequently extracted as those of the regional-scale heavy metal assessment (RHMA) model  ...  Acknowledgements This research was supported by the National Natural Science Foundation of China (no. 40771155) and the National High-Tech R&D Program of China (no. 2007AA12Z174).  ... 
doi:10.1016/j.jag.2012.04.014 fatcat:smft6diiqvbqxacbbht42j72qi

A Review on the Use of Unmanned Aerial Vehicles and Imaging Sensors for Monitoring and Assessing Plant Stresses

Jayme Garcia Arnal Barbedo
2019 Drones  
Unmanned aerial vehicles (UAVs) are becoming a valuable tool to collect data in a variety of contexts.  ...  as in urban settings.  ...  Conflicts of Interest: The author declares no conflict of interest.  ... 
doi:10.3390/drones3020040 fatcat:33jjpgn6rnanxgrnu7235ooymy

Smart System Design: Industrial Challenges and Perspectives

Roberto Zafalon
2013 2013 IEEE 14th International Conference on Mobile Data Management  
In spectral analysis, the characteristics of reflectance and multispectral images are applied in crop detection.  ...  In image processing, morphological features are employed to segment characteristics such as shape, structure, color, and pattern.  ...  As indicated in numerous studies, plant disease or growth status can be detected by the color changes in plant images, spectral reflectance changes, or vegetation index characteristics of remote data.  ... 
doi:10.1109/mdm.2013.106 dblp:conf/mdm/Zafalon13 fatcat:wztjnd55rzbyvliefl2uiapmee

Simulation of Multitemporal and Hyperspectral Vegetation Canopy Bidirectional Reflectance Using Detailed Virtual 3-D Canopy Models

Theres Kuester, Daniel Spengler, Jean-Francois Barczi, Karl Segl, Patrick Hostert, Hermann Kaufmann
2014 IEEE Transactions on Geoscience and Remote Sensing  
In contrast to field measurements, computer based simulations of the canopy BRDF offer an alternative approach that considers parameter-driven setups of virtual canopies under constant illumination conditions  ...  The influence of plant and canopy architecture on canopy bidirectional reflectance and the BRDF is subject of this study.  ...  Acknowledgements EnMAP and the associated research works are funded on behalf of the German Space Administration with resources of the German Federal Ministry of Economic Affairs and Technology.  ... 
doi:10.1109/tgrs.2013.2258162 fatcat:uz53e5gvf5gbxgv6ljdu5yaa3m
« Previous Showing results 1 — 15 out of 117 results