Article
Environmental Sciences
Dekker Ehlers, Chao Wang, John Coulston, Yulong Zhang, Tamlin Pavelsky, Elizabeth Frankenberg, Curtis Woodcock, Conghe Song
Summary: The majority of the aboveground biomass on the Earth's land surface is stored in forests. However, accurate estimation of forest aboveground biomass (FAGB) remains challenging. This study proposed a new conceptual model using remotely sensed data to map FAGB. The model includes height metrics as the most important variables for estimating FAGB.
Article
Environmental Sciences
Jamis M. Bruening, Rico Fischer, Friedrich J. Bohn, John Armston, Amanda H. Armstrong, Nikolai Knapp, Hao Tang, Andreas Huth, Ralph Dubayah
Summary: Accurately estimating aboveground biomass density (AGBD) is crucial for various scientific applications, and the Global Ecosystem Dynamics Investigation (GEDI) uses waveform lidar to map AGBD globally. This study suggests that lidar waveforms may not be unique to AGBD, potentially contributing to large uncertainties in AGBD predictions. Different forest stands exhibit varying levels of uniqueness in their waveforms, impacting the prediction uncertainty, especially in more structurally complex forests. This presents challenges in accurately predicting AGBD using lidar waveforms and highlights the need for further research on the relationships between lidar remote sensing measurements, forest structure, and AGBD.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
K. C. Cushman, John Armston, Ralph Dubayah, Laura Duncanson, Steven Hancock, David Janik, Kamil Kral, Martin Krucek, David M. Minor, Hao Tang, James R. Kellner
Summary: In this study, the sensitivity of Global Ecosystem Dynamics Investigation (GEDI) data and aboveground biomass density (AGBD) predictions to leaf phenology was tested. The results suggest that, with consideration of model choice, GEDI data without considering leaf status can be used for AGBD prediction, which increases data availability and reduces sampling error in some forests.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Agricultural Engineering
Xiaoqian Xu, Blas Mola-Yudego
Summary: This study analyzes data on the establishment of willow, poplar and hybrid aspen plantations in Sweden, showing a decrease in willow plantations and an increase in poplar and hybrid aspen plantations. New plantations tend to spread in southern areas and smaller plantations are preferred over larger ones.
BIOMASS & BIOENERGY
(2021)
Article
Forestry
Felipe Martini Santos, Gilberto Terra, Daniel Piotto, Guilherme Montandon Chaer
Summary: Selective management of regenerating communities in African mahogany production areas can promote the recovery of ecosystem functions on abandoned farmland, resulting in increased biomass and nutrient accumulation. Compared to conventional treatments, selective management treatments can improve soil effective cation exchange capacity and enhance soil enzyme activity, allowing for the colonization of a greater diversity of tree species and providing multiple ecosystem services for agroforestry systems.
FOREST ECOLOGY AND MANAGEMENT
(2021)
Article
Environmental Sciences
Laura Duncanson, James R. Kellner, John Armston, Ralph Dubayah, David M. Minor, Steven Hancock, Sean P. Healey, Paul L. Patterson, Svetlana Saarela, Suzanne Marselis, Carlos E. Silva, Jamis Bruening, Scott J. Goetz, Hao Tang, Michelle Hofton, Bryan Blair, Scott Luthcke, Lola Fatoyinbo, Katharine Abernethy, Alfonso Alonso, Hans-Erik Andersen, Paul Aplin, Timothy R. Baker, Nicolas Barbier, Jean Francois Bastin, Peter Biber, Pascal Boeckx, Jan Bogaert, Luigi Boschetti, Peter Brehm Boucher, Doreen S. Boyd, David F. R. P. Burslem, Sofia Calvo-Rodriguez, Jerome Chave, Robin L. Chazdon, David B. Clark, Deborah A. Clark, Warren B. Cohen, David A. Coomes, Piermaria Corona, K. C. Cushman, Mark E. J. Cutler, James W. Dalling, Michele Dalponte, Jonathan Dash, Sergio de-Miguel, Songqiu Deng, Peter Woods Ellis, Barend Erasmus, Patrick A. Fekety, Alfredo Fernandez-Landa, Antonio Ferraz, Rico Fischer, Adrian G. Fisher, Antonio Garcia-Abril, Terje Gobakken, Jorg M. Hacker, Marco Heurich, Ross A. Hill, Chris Hopkinson, Huabing Huang, Stephen P. Hubbell, Andrew T. Hudak, Andreas Huth, Benedikt Imbach, Kathryn J. Jeffery, Masato Katoh, Elizabeth Kearsley, David Kenfack, Natascha Kljun, Nikolai Knapp, Kamil Kral, Martin Krucek, Nicolas Labriere, Simon L. Lewis, Marcos Longo, Richard M. Lucas, Russell Main, Jose A. Manzanera, Rodolfo Vasquez Martinez, Renaud Mathieu, Herve Memiaghe, Victoria Meyer, Abel Monteagudo Mendoza, Alessandra Monerris, Paul Montesano, Felix Morsdorf, Erik Naesset, Laven Naidoo, Reuben Nilus, Michael O'Brien, David A. Orwig, Konstantinos Papathanassiou, Geoffrey Parker, Christopher Philipson, Oliver L. Phillips, Jan Pisek, John R. Poulsen, Hans Pretzsch, Christoph Rudiger, Sassan Saatchi, Arturo Sanchez-Azofeifa, Nuria Sanchez-Lopez, Robert Scholes, Carlos A. Silva, Marc Simard, Andrew Skidmore, Krzysztof Sterenczak, Mihai Tanase, Chiara Torresan, Ruben Valbuena, Hans Verbeeck, Tomas Vrska, Konrad Wessels, Joanne C. White, Lee J. T. White, Eliakimu Zahabu, Carlo Zgraggen
Summary: This paper presents the development of models used by NASA's Global Ecosystem Dynamics Investigation (GEDI) to estimate forest aboveground biomass density (AGBD). The models were developed using globally distributed field and airborne lidar data, with simulated relative height metrics as predictor variables. The study found that stratification by geographic domain and the use of square root transformation improved model performance.
REMOTE SENSING OF ENVIRONMENT
(2022)
Article
Forestry
Zhen Yu, Weibin You, Evgenios Agathokleous, Guoyi Zhou, Shirong Liu
Summary: This study analyzed the carbon sequestration of planted forests in China and found that future forest biomass carbon increment may have been overestimated. It also highlighted the significant impact of management and age-related growth on biomass carbon change in planted forests.
Article
Forestry
Cyril H. Melikov, Jacob J. Bukoski, Susan C. Cook-Patton, Hongyi Ban, Jessica L. Chen, Matthew D. Potts
Summary: This review assesses the impacts of three common forest management practices-inorganic NPK fertilizer application, interplanting with N-fixing species, and thinning-on aboveground carbon stocks in plantation forests. The effects of these practices vary depending on species selection, precipitation, time since practice, soil moisture regime, and previous land use. Management actions have the potential to enhance climate mitigation in plantation forests if local conditions are considered.
CURRENT FORESTRY REPORTS
(2023)
Article
Environmental Sciences
Jeroen S. de Nobel, Kenneth F. Rijsdijk, Perry Cornelissen, Arie C. Seijmonsbergen
Summary: The Oostvaardersplassen nature reserve in the Netherlands has dealt with the issue of excessive grazing by large herbivores, which has led to the domination of short grazed grasslands and decreased biodiversity. To restore a diverse landscape, the reserve has implemented controlled grazing numbers since 2018. Fine-scale mapping and monitoring of aboveground biomass have been used as a tool to evaluate management efforts. By developing a random forest model, the correlation between field-based samples of aboveground biomass and height-related vegetation metrics from LiDAR data was analyzed. Handheld LiDAR was found to be a promising technique for retrieving detailed height-related metrics in grasslands and can support management decisions in nature reserves.
Article
Forestry
Raffaele Spinelli, Natascia Magagnotti, Alberto Assirelli, Joao Pedro Martins, Matevz Mihelic
Summary: The study tracked the bundling of logging residues from eucalypt plantations in Portugal and Spain using a John Deere 1490 forwarder bundler over a 7-year period. It found high bundling productivity, mechanical availability, and utilization rates, with a slight decline in productivity over time possibly due to wear and challenging conditions. Bundling technique appears to thrive in the Iberian region due to its industrial eucalypt farming and bioenergy generation, offering efficient residue recovery in constrained industrial plantation settings.
Article
Plant Sciences
Maggi Schick, Robert Griffin, Emil Cherrington, Thomas Sever
Summary: Universities have the opportunity to use urban forestry methods to promote ecological and economic conservation. This study used field measurements and LiDAR remote sensing to estimate biomass on the University of Alabama in Huntsville campus. The results showed high fit for most tree species, providing a methodology for estimating biomass in urban areas without intensive field surveys.
URBAN FORESTRY & URBAN GREENING
(2023)
Article
Environmental Sciences
Zhongbing Chang, Sanaa Hobeichi, Ying-Ping Wang, Xuli Tang, Gab Abramowitz, Yang Chen, Nannan Cao, Mengxiao Yu, Huabing Huang, Guoyi Zhou, Genxu Wang, Keping Ma, Sheng Du, Shenggong Li, Shijie Han, Youxin Ma, Jean-Pierre Wigneron, Lei Fan, Sassan S. Saatchi, Junhua Yan
Summary: This study integrated field measurements and existing AGB products in China to develop two new hybrid forest AGB products using optimal weighting technique and random forest regression method. The new products showed higher accuracy and lower discrepancies with field measurements, indicating potential to improve spatial variability and reduce uncertainty in carbon stock estimates.
Article
Environmental Sciences
Lv Zhou, Xuejian Li, Bo Zhang, Jie Xuan, Yulin Gong, Cheng Tan, Huaguo Huang, Huaqiang Du
Summary: In this study, a new method was developed to accurately calculate the 3D green volume of single trees from unmanned aerial vehicle laser scanner data, and compared with traditional algorithms, showing higher accuracy. The voxel coupling convex hull by slices algorithm can effectively improve the estimation accuracy of aboveground biomass (AGB) by considering 3D green volume.
Article
Environmental Sciences
Maurice Mugabowindekwe, Martin Brandt, Jerome Chave, Florian Reiner, David L. L. Skole, Ankit Kariryaa, Christian Igel, Pierre Hiernaux, Philippe Ciais, Ole Mertz, Xiaoye Tong, Sizhuo Li, Gaspard Rwanyiziri, Thaulin Dushimiyimana, Alain Ndoli, Valens Uwizeyimana, Jens-Peter Barnekow Lilleso, Fabian Gieseke, Compton J. J. Tucker, Sassan Saatchi, Rasmus Fensholt
Summary: This study proposes an approach to map the carbon stock of each individual tree at the national scale of Rwanda using aerial imagery from 2008 and deep learning. The results show that 72% of the mapped trees are located in farmlands and savannas, and 17% in plantations, accounting for 48.6% of the national aboveground carbon stocks. Natural forests cover 11% of the total tree count and 51.4% of the national carbon stocks, with an overall carbon stock uncertainty of 16.9%. The mapping of all trees is crucial for effective planning and monitoring of restoration activities, as well as optimization of carbon sequestration, biodiversity, and economic benefits.
NATURE CLIMATE CHANGE
(2023)
Article
Environmental Sciences
Ying Yu, Yan Pan, Xiguang Yang, Wenyi Fan
Summary: This study establishes a forest biomass estimation model using remote sensing data and investigates scale effect errors. By calculating the information entropy and developing an entropy-weighted index for scale conversion, the scale error of biomass estimation from coarse-resolution remote sensing images is effectively corrected.
Article
Forestry
Yesid Alejandro Marino Macana, Robson Schaff Correa, Fabio Henrique Silva Floriano de Toledo, Alexandre de Vicente Ferraz, Eric Victor de Oliveira Ferreira, Rodrigo Eiji Hakamada, Gabriela Goncalves Moreira, Jose Carlos Arthur Junior, Jose Leonardo de Moraes Goncalves
Summary: Application of dolomitic limestone and gypsum can stimulate root development and enhance access to water in Eucalyptus plantations in the Brazilian savanna. It also positively impacts soil fertility and improves the growth and wood volume of Eucalyptus trees.
Article
Forestry
Roger Chambi-Legoas, Mario Tomazello-Filho, Jean -Paul Laclau, Gilles Chaix
Summary: The objective of this study was to understand the interactive effects of K fertilization, water availability, and tree age on stem growth and xylem traits of E. grandis trees over a full rotation. The results showed that K fertilization increased tree growth rates but led to an interruption of growth during a severe drought in 2014. However, K fertilization had a positive effect on growth recovery following drought. The main changes in xylem traits during drought occurred in vessel characteristics.
FOREST ECOLOGY AND MANAGEMENT
(2023)
Article
Engineering, Environmental
Gabriel Palma Petrielli, Guilherme Pessoa Nogueira, Daniele de Souza Henzler, Narie Rinke Dias De Souza, Karina Maria Berbert Bruno, Ana Claudia Dos Santos Luciano, Guerric le Maire, Thayse Aparecida Dourado Hernandes
Summary: This study aims to integrate satellite image classification and georeferenced modeling to simulate ethanol production in sugarcane areas in Brazil. The resulting data shows significant spatial variations in ethanol's carbon footprint and its potential for gasoline substitution. The proposed framework provides important insights for future sustainability assessments.
RESOURCES CONSERVATION AND RECYCLING
(2023)
Article
Agronomy
Raynara Ferreira da Silva, Rodrigo Hakamada, Moema Barbosa de Sousa, Graziele Nunes Lopes dos Santos
Summary: This study examined the growth, survival rate, and biomass content of Khaya senegalensis in both a pure plantation system and an agroforestry system with banana and corn. The results showed no significant difference in survival rate and wood density between the two systems. However, individual growth and overall yield were higher in the pure plantation system. The agroforestry system, on the other hand, had additional banana and corn production. Overall, the pure plantation system had a higher aboveground biomass accumulation. Therefore, agroforestry could be a viable alternative for small farmers looking to optimize land use and reduce establishment costs.
AGROFORESTRY SYSTEMS
(2023)
Article
Meteorology & Atmospheric Sciences
Amine Ouhechou, Nathalie Philippon, Beatrice Morel, Jorg Trentmann, Alexandre Graillet, Armand Mariscal, Yann Nouvellon
Summary: For the first time, this study presents the average evolution of incoming solar radiation in Central Africa by comparing eight gridded products and station-based estimations or measurements. The products show low levels of global horizontal irradiance (GHI) in the west and higher levels towards the north and south margins of the region. The performance of the products is assessed by comparing them with in-situ measurements from meteorological stations and considering the shape, amplitude, and frequency of occurrence of diurnal cycles.
ATMOSPHERIC RESEARCH
(2023)
Article
Forestry
Greta Formaglio, Alex Vladimir Krusche, Louis Mareschal, Jean-Pierre Bouillet, Jose Leonardo de Moraes Gonsalves, Yann Nouvellon, Juan Sinforiano Delgado-Rojas, Alexandra Montebelo, Jacques Ranger, Jean -Paul Laclau
Summary: Planting nitrogen-fixing species can increase nitrogen availability for tree growth without causing large leaching losses, making mixed plantations with these trees valuable. Our study in São Paulo, Brazil, evaluated nutrient fluxes in soil solutions in monocultures and mixed plantations of Acacia mangium and Eucalyptus grandis. We found that Acacia monocultures had higher nitrogen concentrations in the topsoil solutions compared to Eucalyptus, but this difference was no longer observed at deeper depths. Leaching losses of dissolved nutrients were low in fast-growing plantations established on deep Ferralsols.
FOREST ECOLOGY AND MANAGEMENT
(2023)
Article
Ecology
Camille Girard-Tercieux, Isabelle Marechaux, Adam T. Clark, James S. Clark, Benoit Courbaud, Claire Fortunel, Joannes Guillemot, Georges Kunstler, Guerric le Maire, Raphael Pelissier, Nadja Rueger, Ghislain Vieilledent
Summary: Intraspecific variability (IV) plays a crucial role in species coexistence in forest plant communities. The large observed IV is influenced by the high-dimensional environmental variation. This highlights the importance of considering the response of individuals to the high-dimensional environment when studying species coexistence.
ECOLOGY AND EVOLUTION
(2023)
Article
Plant Sciences
Kittima Waithaisong, Agnes Robin, Louis Mareschal, Jean-Pierre Bouillet, Jean-Michel Harmand, Bruno Bordron, Jean-Paul Laclau, Jose Leonardo Moraes Goncalves, Claude Plassard
Summary: We hypothesized that Acacia mangium, a nitrogen-fixing tree, could enhance the growth and nitrogen nutrition of non-fixing tree species, such as Eucalyptus. We compared N-mineralization rates, respiration rates, and N bioavailability in soil samples collected from areas covered with Acacia, Eucalyptus, or native vegetation in two tropical sites. Our results showed that Eucalyptus seedling growth and N bioavailability were influenced by the N-mineralization rates, but bioassays in pots were more accurate in predicting the growth of Eucalyptus seedlings. Therefore, planting Acacia mangium could be a beneficial option to maintain the growth and N bioavailability of non-fixing tree species in the tropical planted forests.
Article
Agronomy
Xueqian Wang, Peter D. Blanken, Jeffrey D. Wood, Yann Nouvellon, Philippe Thaler, Poonpipope Kasemsap, Amnat Chidthaisong, Pakorn Petchprayoon, Chompunut Chayawat, Jingfeng Xiao, Xing Li
Summary: Past assessments of the global carbon balance have shown high uncertainty in Mainland Southeast Asia (MSEA) due to climate extremes and land use changes. This study evaluated the potential of solar-induced chlorophyll fluorescence (SIF) and near-infrared reflectance of vegetation (NIRv) in assessing vegetation gross primary production (GPP) and drought stress in rubber plantations and natural forests in this tropical monsoon region. The results showed that SIF and NIRv performed better than other vegetation indices in detecting GPP and drought effects. SIF-GPP relationship was mainly controlled by NIRv, representing canopy structural effects.
AGRICULTURAL AND FOREST METEOROLOGY
(2023)
Article
Forestry
Gabriela Goncalves Moreira, Rodrigo Hakamada, Renato Meulman Leite de Silva, Cristiane Camargo Zani de Lemos, Antonio Leite Florentino, Jose Leonardo de Moraes Goncalves
Summary: The objective of this study was to evaluate the losses, survival, uniformity, and growth of a clonal planting of Eucalyptus grandis x Eucalyptus urophylla in Brazil during a short rotation, based on the different morphological characteristics of the seedlings as indicators of quality. The quality of seedlings was positively correlated with stem diameter, leaf biomass, and PH50 at 60 days of age, but these relationships lost significance over time. Only the old seedlings showed a difference in wood volume compared to the other treatments during the 36 to 64 month period.
Article
Forestry
Rodrigo Hakamada, Silvio Frosini de Barros Ferraz, Belkis Sulbaran-Rangel
Summary: This study investigated the current scenario and trends regarding human resources in the forest sector. The findings suggest a shortage of qualified professionals in the job market and a lack of behavioral skills training. New college graduates were found to lack important soft skills and knowledge in certain areas. However, there was a convergence between job requirements and the skills considered important by new graduates.
Article
Environmental Sciences
Rodrigo Hakamada, Jesus Prados-Coronado, Cassiano Lages, Arthur Vrechi, Virgilio Zuniga-Grajeda, Freddy Hernan Villota-Gonzalez, Belkis Sulbaran-Rangel
Summary: This study evaluated the impact of different stocking densities on the growth of Gmelina arborea and the efficacy of using drones to capture aerial images of tree crown cover. The results showed that higher stocking densities led to better tree growth and that Gmelina arborea has promising carbon storage capacity. Using simple cameras and drones proved effective in detecting and estimating crown areas, although the presence of weeds reduced effectiveness.
Article
Ecology
Ivan Cornut, Guerric le Maire, Jean-Paul Laclau, Joannes Guillemot, Yann Nouvellon, Nicolas Delpierre
Summary: This study used a model to simulate the effect of potassium (K) availability on wood productivity in Brazilian eucalypt plantations. The results showed that K limitation had a significant impact on wood production, and the relationship between K availability and net primary productivity (NPP) was not linear. The model also suggested optimal K fertilisation levels similar to current recommendations in Brazilian eucalypt plantations.
Article
Ecology
Ivan Cornut, Nicolas Delpierre, Jean-Paul Laclau, Joannes Guillemot, Yann Nouvellon, Otavio Campoe, Jose Luiz Stape, Vitoria Fernanda Santos, Guerric le Maire
Summary: The limitation of potassium on forest productivity is more widespread than previously thought and could influence forests' response to future global changes. A model was developed to simulate the interactions between potassium, carbon, and water cycles in tropical eucalypt plantations in Brazil. Results showed that potassium deficiency reduced gross primary productivity by more than 50% during a 6-year cycle.
Article
Forestry
Rodrigo E. Hakamada, Dan Binkley, Eduardo More Mattose
Summary: Eucalyptus plantations in Brazil exhibit high productivity but significant growth differences. This study found that variation in light use and light use efficiency contribute to the growth disparities across the 1100 km environmental gradient. Differences in clones also play a crucial role in growth variation at each site. Notably, water deficit does not directly affect light use, but rather results in a decline in light use efficiency as water deficit increases by 100 mm per year.
FOREST ECOLOGY AND MANAGEMENT
(2023)
Article
Environmental Sciences
Ruonan Chen, Liangyun Liu, Xinjie Liu, Zhunqiao Liu, Lianhong Gu, Uwe Rascher
Summary: This study presents methods to accurately estimate sub-daily GPP from SIF in evergreen needleleaf forests and demonstrates that the interactions among light, canopy structure, and leaf physiology regulate the SIF-GPP relationship at the canopy scale.
REMOTE SENSING OF ENVIRONMENT
(2024)
Article
Environmental Sciences
Daniel L. Goldberg, Madankui Tao, Gaige Hunter Kerr, Siqi Ma, Daniel Q. Tong, Arlene M. Fiore, Angela F. Dickens, Zachariah E. Adelman, Susan C. Anenberg
Summary: A novel method is applied in this study to directly use satellite data to evaluate the spatial patterns of urban NOx emissions inventories. The results show that the 108 spatial surrogates used by NEMO are generally appropriate, but there may be underestimation in areas with dense intermodal facilities and overestimation in wealthy communities.
REMOTE SENSING OF ENVIRONMENT
(2024)
Article
Environmental Sciences
Zhuoyue Hu, Xiaoyan Li, Liyuan Li, Xiaofeng Su, Lin Yang, Yong Zhang, Xingjian Hu, Chun Lin, Yujun Tang, Jian Hao, Xiaojin Sun, Fansheng Chen
Summary: This paper proposes a whisk-broom imaging method using a long-linear-array detector and high-precision scanning mirror to achieve high-resolution and wide-swath thermal infrared data. The method has been implemented in the SDGs satellite and has shown promising test results.
REMOTE SENSING OF ENVIRONMENT
(2024)
Article
Environmental Sciences
Dandan Wang, Leiqiu Hu, James A. Voogt, Yunhao Chen, Ji Zhou, Gaijing Chang, Jinling Quan, Wenfeng Zhan, Zhizhong Kang
Summary: This study evaluates different schemes for determining model coefficients to quantify and correct the anisotropic impact from remote sensing LST for urban applications. The schemes have consistent results and accurately estimate parameter values, facilitating the broadening of parametric models.
REMOTE SENSING OF ENVIRONMENT
(2024)
Article
Environmental Sciences
Jamie Tolan, Hung - Yang, Benjamin Nosarzewski, Guillaume Couairon, Huy V. Vo, John Brandt, Justine Spore, Sayantan Majumdar, Daniel Haziza, Janaki Vamaraju, Theo Moutakanni, Piotr Bojanowski, Tracy Johns, Brian White, Tobias Tiecke, Camille Couprie
Summary: Vegetation structure mapping is crucial for understanding the global carbon cycle and monitoring nature-based approaches to climate adaptation and mitigation. This study presents the first high-resolution canopy height maps for California and Sao Paulo, achieved through the use of very high resolution satellite imagery and aerial lidar data. The maps provide valuable tools for forest structure assessment and land use monitoring.
REMOTE SENSING OF ENVIRONMENT
(2024)
Article
Environmental Sciences
Regina Eckert, Steffen Mauceri, David R. Thompson, Jay E. Fahlen, Philip G. Brodrick
Summary: In this paper, a mathematical framework is proposed to improve the retrieval of surface reflectance and atmospheric parameters by leveraging the expected spatial smoothness of the atmosphere. Experimental results show that this framework can reduce the surface reflectance retrieval error and surface-related biases.
REMOTE SENSING OF ENVIRONMENT
(2024)
Article
Environmental Sciences
Chongya Jiang, Kaiyu Guan, Yizhi Huang, Maxwell Jong
Summary: This study presents the Field Rover method, which uses vehicle-mounted cameras to collect ground truth data on crop harvesting status. The machine learning approach and remote sensing technology are employed to upscale the results to a regional scale. The accuracy of the remote sensing method in predicting crop harvesting dates is validated through comparison with satellite data.
REMOTE SENSING OF ENVIRONMENT
(2024)
Article
Environmental Sciences
Oksana V. Lunina, Anton A. Gladkov, Alexey V. Bochalgin
Summary: In this study, an unmanned aerial vehicle (UAV) was used to detect and map surface discontinuities with displacements of a few centimeters, indicating the presence of initial geological deformations. The study found that sediments of alluvial fans are susceptible to various tectonic and exogenous deformational processes, and the interpretation of ultra-high resolution UAV images can help recognize low-amplitude brittle deformations at an early stage. UAV surveys are critical for discerning neotectonic activity and its related hazards over short observation periods.
REMOTE SENSING OF ENVIRONMENT
(2024)
Article
Environmental Sciences
Feng Zhao, Weiwei Ma, Jun Zhao, Yiqing Guo, Mateen Tariq, Juan Li
Summary: This study presents a data-driven approach to reconstruct the terrestrial SIF spectrum using measurements from the TROPOMI instrument on Sentinel-5 precursor mission. The reconstructed SIF spectrum shows improved spatiotemporal distributions and demonstrates consistency with other datasets, indicating its potential for better understanding of the ecosystem function.
REMOTE SENSING OF ENVIRONMENT
(2024)
Article
Environmental Sciences
Stephen Stehman, John E. Wagner
Summary: This article investigates optimal sample allocation in stratified random sampling for estimation of accuracy and proportion of area in applications where the target class is rare. The study finds that precision of estimated accuracy has a stronger impact on sample allocation than estimation of proportion of area, and the trade-offs among these estimates become more pronounced as the target class becomes rarer. The results provide quantitative evidence to guide sample allocation decisions in specific applications.
REMOTE SENSING OF ENVIRONMENT
(2024)
Article
Environmental Sciences
Jingyao Zheng, Tianjie Zhao, Haishen Lu, Defu Zou, Nemesio Rodriguez-Fernandez, Arnaud Mialon, Philippe Richaume, Jianshe Xiao, Jun Ma, Lei Fan, Peilin Song, Yonghua Zhu, Rui Li, Panpan Yao, Qingqing Yang, Shaojie Du, Zhen Wang, Zhiqing Peng, Yuyang Xiong, Zanpin Xing, Lin Zhao, Yann Kerr, Jiancheng Shi
Summary: Soil moisture and freeze/thaw (F/T) play a crucial role in water and heat exchanges at the land-atmosphere interface. This study reports the establishment of a wireless sensor network for soil moisture and temperature over the permafrost region of Tibetan Plateau. Satellite-based surface soil moisture (SSM) and F/T products were evaluated using ground-based measurements. The results show the reliability of L-band passive microwave SSM and F/T products, while existing F/T products display earlier freezing and later thawing, leading to unsatisfactory accuracy.
REMOTE SENSING OF ENVIRONMENT
(2024)