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Analysis of forest structural complexity using airborne LiDAR data and aerial photography in a mixed conifer–broadleaf forest in northern Japan

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Journal of Forestry Research 2018年第2期29卷 473-487页

作者： Sadeepa Jayathunga Toshiaki Owari satoshi tsuyuki Department of Global Agricultural Sciences Graduate School of Agricultural and Life SciencesThe University of Tokyo The University of Tokyo Hokkaido Forest Graduate School of Agricultural and Life SciencesThe University of Tokyo

Determining forest structural complexity,i.e.,a measure of the number of different attributes of a forest and the relative abundance of each attribute,is important for forest management and *** this study,we examined the structural complexity of mixed conifer–broadleaf forests by integrating multiple forest structural attributes derived from airborne Li DAR data and aerial *** sampled 76 plots from an unmanaged mixed conifer–broadleaf forest reserve in northern ***-level metrics were computed for all plots using both field and remote sensing data to assess their ability to capture the vertical and horizontal variations of forest structure.A multivariate set of forest structural attributes that included three Li DAR metrics(95 th percentile canopy height,canopy density and surface area ratio) and one image metric(proportion of broadleaf cover),was used to classify forest structure into structural complexity *** results revealed significant correlation between field and remote sensing metrics,indicating that these two sets of measurements captured similar patterns of structure in mixed conifer–broadleaf ***,cluster analysis identified six forest structural complexity classes includingtwo low-complexity classes and four high-complexity classes that were distributed in different elevation *** this study,we could reliably analyze the structural complexity of mixed conifer–broadleaf forests using a simple and easy to calculate set of forest structural attributes derived from airborne Li DAR data and high-resolution aerial *** study provides a good example of the use of airborne Li DAR data sets for wider purposes in forest ecology as well as in forest management.

关键词： Airborne laser scanning High resolution imagery Hokkaido Forest structure Pan-mixed forests

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Determinants of Tobacco Cultivation and the Associated Impacts of Adoption in Hurungwe District, Zimbabwe

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Agricultural Sciences 2024年第4期15卷 505-531页

作者： Spencer Sibanda satoshi tsuyuki Department of Information and Computer Sciences Graduate School of Science and Engineering Saitama University Saitama Japan Department of Global Agricultural Sciences Graduate School of Agricultural and Life Sciences The University of Tokyo Tokyo Japan

Tobacco is an essential cash crop in Zimbabwe and a strategic livelihood option for hundreds of thousands of rural households. However, the crop is linked to negative environmental, economic, and social impacts. The existing studies on tobacco cultivation in Zimbabwe present contradictory findings on the determinants and impacts of adoption, leaving unanswered questions about the crop’s sustainability impact in the country. This article investigates the determinants of smallholder farmers’ decisions to grow tobacco and the associated impacts of adoption. Random and purposive sampling were used to select 273 household surveys, including tobacco and non-tobacco smallholder farmers, and 56 expert interviews to answer the research questions. We employed regression models alongside expert interviews and document analysis to identify the determinants influencing the decision-making process of smallholder farmers in Zimbabwe regarding tobacco cultivation. Additionally, our investigation aimed to elucidate the perceived impacts associated with the adoption of this agricultural practice. The regression analysis indicated that the farmer’s age, education level, farming experience, family size, household income, and perceived high farm profitability are significant drivers of tobacco adoption. We also discovered divergent and convergent perceptions of the critical impacts of tobacco cultivation. The study highlights the need for proactive multi-stakeholder collaboration and sustainable financial arrangements to address the negative impacts of tobacco production. As the primary stakeholder responsible for regulating and promoting agricultural activities, the Zimbabwean government should provide meaningful financial support, increase access to credit, and ensure better market facilities for alternative crops to reduce the over-dependence on tobacco.

关键词： Tobacco Cultivation Determinants of Adoption Sustainability Impacts Economic Livelihood Stakeholder Perceptions

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Identifying the Rates and Drivers of Spatiotemporal Patterns of Land Use and Land Cover Changes in the Hurungwe District, Zimbabwe: A GIS and Remote Sensing Approach

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Journal of Geographic Information System 2022年第6期14卷 652-679页

作者： Spencer Sibanda satoshi tsuyuki Department of Global Agricultural Sciences Graduate School of Agricultural and Life Sciences The University of Tokyo Tokyo Japan

Identifying spatiotemporal patterns of land use and land cover changes (LULCC) and their impacts on the natural environment is essential in policy decisions for effective, sustainable natural resource management solutions. This study employed supervised image classification in Google Earth Engine (GEE) cloud-based platform to assess the land cover land use changes for the past 30 years (1989-2020), as well as predict the land cover states and the risk of future forest loss in the next ten years, using TerrSet 20 software in Hurungwe district, Zimbabwe. The study findings revealed a net forest area and shrub loss of 32% and 10%, while croplands, water bodies, and bare lands have increased by about 171%, 7%, and 119% between 1989 and 2020, respectively. Croplands are the major contributor to the net change in forests, particularly tobacco farming. The predictive model estimated that by 2030 the district would lose approximately 7% of the current forest cover area, most likely converted into croplands, shrubs, and settlements. The results reinforce the importance of bridging the gap between socioeconomic activities and institutional policies to ensure proper natural resource management. Integrating institutional policy and socioeconomic goals is indispensable to ensure sustainable development.

关键词： Land Use and Land Cover Change Cellular Automata-Markov Tobacco Farming Drivers of Deforestation Geographic Information System

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Estimating Individual Tree Diameter and Stem Volume Using Airborne LiDAR in Saga Prefecture, Japan

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Open Journal of Forestry 2018年第2期8卷 205-228页

作者： Katsumasa Oono satoshi tsuyuki Department of Global Agricultural Sciences The University of Tokyo Tokyo Japan Forest & Agriculture Solution Department Asia Air Survey CO. LTD. Kanagawa Japan

Advancements in airborne LiDAR analysis technology have made it possible to quantify forest resource volumes based on individual trees, and such technology may soon replace field surveys. Unlike individual tree detection or tree height measurements, diameter at breast height (DBH) is difficult to determine directly from measured data and is instead estimated indirectly using the correlation between crown size and DBH. Indicators that represent crown size include crown area, surface area, length, and length ratio, and were utilized with tree height as explanatory variables in ten combinations to determine a regression formula. DBH and tree height calculated from the regression formula were applied to an equation to calculate stem volumes of individual trees. Airborne LiDAR measurements were taken using ALS50-II and ALS60 (Leica) at a density of 4 points/m2. An evaluation of the relationship between the regression formulae and DBH estimates indicated that a combination of crown area, tree height, and crown ratio for Japanese cedar, and a combination of crown area and tree height for Japanese cypress, yielded the highest coefficients of determination. The average error and RMSE were 6.9% and 2.38 cm respectively for Japanese cedar, while the corresponding values for Japanese cypress were 8.35% and 2.51 cm. Once the relationship was extended to the stem volumes of individual trees, the average error was 14.4% and RMSE was 0.10 m3 for Japanese cedar. The corresponding values for Japanese cypress were 18.9% and 0.10 m3. These results demonstrate the potential use of airborne LiDAR as a substitute for field surveys.

关键词： Airborne LiDAR Diameter at Breast Height Individual Treevolume Forest Resource Individual-Tree-Based Approach

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Contribution of MODIS NDVI 250 m Multi-Temporal Imagery Dataset for the Detection of Natural Forest Distribution of Java Island, Indonesia

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Journal of Geographic Information System 2012年第5期4卷 462-469页

作者： Syartinilia Wijaya satoshi tsuyuki Department of Landscape Architecture Faculty of Agriculture Bogor Agricultural University (IPB) Bogor Indonesia Graduate School of Agricultural and Life Sciences The University of Tokyo Tokyo Japan

As landmass of the world is covered by vegetation, taking into account phenology when performing land cover classification may yield more accurate maps. The availability of no-cost Moderate Resolution Imaging Spectrometer (MODIS) NDVI dataset that provides high-quality continuous time series data is representing a potentially significant source of land cover information especially for detection natural forest distribution. This study intends to assess the advantage of MODIS 250 m Normalized Difference Vegetation Index (NDVI) multi-temporal imagery for detection of densely vegetation cover distribution in Java and then for identification of remaining natural forest in Java from densely vegetation cover distribution. Result of this study successfully demonstrated the contribution of MODIS NDVI 250 m for detection the natural forest distribution in Java Island. Therefore, the approach described herein provided classification accuracy comparable to those of maps derived from higher resolution data and will be a viable alternative for regional or national classifications.

关键词： Java MODIS Multi-Temporal Natural Forest NDVI

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Projected impacts of climate change and anthropogenic effects on habitat distribution of endangered Javan Hawk-Eagle in Indonesia

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Geography and Sustainability 2024年第2期5卷 241-250页

作者： Syartinilia Aryo Adhi Condro satoshi tsuyuki Department of Landscape Architecture Faculty of AgricultureIPB University(Bogor Agricultural University)Bogor 16680Indonesia International Research Institute for Environment and Climate Change-IPB University Collaborative Research CentreBogor 16128Indonesia Rainforest Alliance DenpasarBali 80227Indonesia Graduate School of Agricultural and Life Sciences The University of TokyoTokyo 113-8657Japan

Changing climate will jeopardize biodiversity,particularly the geographic distribution of endemic *** such species is the Javan Hawk-Eagle(JHE,Nisaetus bartelsi),a charismatic raptor found only on Java Island,***,it is crucial to develop an appropriate conservation strategy to preserve the *** niche modeling is considered a valuable tool for designing conservation plans for the *** provide an ecological niche modeling approach and transfer its model to future climate scenarios for the *** utilize various machine learning algorithms under sustainability and business-as-usual(BAU)scenarios for ***,we investigate the conservation vulnerability of the JHE,capturing multifaceted pressures on the species from climate dissimilarities and human disturbance *** study reveals that the ensemble model performs exceptionally well,with temperature emerging as the most critical factor affecting the JHE *** finding indicates that climate change will have a significant impact on the JHE *** results suggest that the JHE distribution will likely decrease by 28.41%and 40.16%from the current JHE distribution under sustainability and BAU scenarios,***,our study reveals high-potential refugia for future JHE,covering 7,596 km^(2)(61%)under the sustainability scenario and only 4,403 km^(2)(35%)under the BAU ***,effective management and planning,including habitat restoration,refugia preservation,habitat connectivity,and local community inclusivity,should be well-managed to achieve JHE conservation targets.

关键词： Climate change Ecological niche Ensemble model Refugia Javan Hawk-Eagle

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Geostatistical Approach for Site Suitability Mapping of Degraded Mangrove Forest in the Mahakam Delta, Indonesia

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Journal of Geographic Information System 2013年第5期5卷 419-428页

作者： Ali Suhardiman satoshi tsuyuki Muhammad Sumaryono Yohanes Budi Sulistioadi Department of Global Agricultural Sciences The University of Tokyo Tokyo Japan

As part of operational guidance of mangrove forest rehabilitation in the Mahakam delta, Indonesia, site suitability mapping for 14 species of mangrove was modelled by combining 4 underlying factors—clay, sand, salinity and tidal inundation. Semivariogram analysis and a geographic information system (GIS) were used to apply a site-suitability model, while kriging interpolation generated surface layers, based on sample point data collection. The tidal inundation map was derived from a tide table and a digital elevation model from topographic maps. The final site-suitability maps were produced using spatial analysis technique, by overlaying all surface layers. We used a Gaussian model to adjust a semivariogram graph in order to help to understand the variation of sample data values, and create a natural surface layer of data distribution over the area of study. By examining the statistical value and the visual inspection of surface layers, we saw that the models were consistent with the expected data behavior;therefore, we assumed that interpolation has been carried out appropriately. Our site-suitability map showed that Avicennia species was the most suitable species and matched with 50% of the study area, followed by Nypa fruticans, which occupied about 42%. These results were actually consistent with the mangrove zoning pattern in the region prior to deforestation and conversion.

关键词： Site Suitability Mapping Mangrove Forest Geographical Information System Geostatistical Analysis

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Bi-predual Spaces of Generalized Campanato Spaces with Variable Growth Condition

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Acta Mathematica Sinica,English Series 2025年第1期41卷 273-303页

作者： satoshi Yamaguchi Eiichi Nakai Katsunori Shimomura Department of Mathematics Ibaraki UniversityMitoIbaraki 310–8512Japan

In this paper we extend the duality(C_(comp)^(∞)(R^(d))^(BMO(R^d))))^(∗)=H^(1)(R^(d))to generalized Campanato spaces with variable growth condition Lp,φ(R^(d))instead of BMO(R^(d)).We also extend the characterization of C_(comp)^(∞)(R^(d))BMO(Rd)by Uchiyama(1978)to C_(comp)^(∞)(R^(d))L _(p,φ)(R^(d)).Moreover,using this characterization,we prove the boundedness of singular and fractional integral operators on C_(comp)^(∞)(R_(d))L_(p,φ)(R^(d)).The function space L_(p,φ)(R^(d))treated in this paper covers the case that it is coincide with Lip_(α) on one area,with BMO on another area and with the Morrey space on the other area,for example.

关键词： Campanato space variable growth condition predual singular integral fractional integral

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Advances in quantum dots for classical and non-classical light sources Invited Paper

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Chinese Optics Letters 2008年第10期6卷 718-723页

作者： Yasuhiko Arakawa satoshi Iwamoto satoshi Kako Masahiro Nomura Denis Guimard Research Center for Advanced Science and Technology Institute for Nano Quantum Information ElectronicsThe University of Tokyo4-6-1 Meguro-ku153-8505 TokyoJapan

Recent advances in quantum dots （QDs） for classical and non-classical light sources are presented. We have established metal organic chemical vapor deposition （MOCVD） technology for InAs-based QD lasers at 1.3 μm and achieved ultralow threshold in QD lasers with photonic crystal （PhC） nanocavity. In addition, single photon emitters at 1.55 μm, GaN-based single photon sources operating at 200 K, and high-Q PhC nanocavity have been demonstrated.

关键词： QDs Advances in quantum dots for classical and non-classical light sources Invited Paper AIN InAs

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Application of 3D Scanned Big Data of Large-scale Cultural Heritage Objects Based on Noise-robust Transparent Visualization

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系统仿真学报 2023年第8期35卷 1635-1650页

作者： Tanaka satoshi College of Information Science and Engineering Ritsumeikan UniversityShiga 525-8577Japan

Three-dimensional(3D) scanning technology has undergone remarkable developments in recent *** acquired by 3D scanning have the form of 3D point *** 3D scanned point clouds have data sizes that can be considered big *** also contain measurement noise inherent in measurement *** properties of 3D scanned point clouds make many traditional CG/visualization techniques *** paper reviewed our recent achievements in developing varieties of high-quality visualizations suitable for the visual analysis of 3D scanned point *** demonstrated the effectiveness of the method by applying the visualizations to various cultural heritage *** main visualization targets used in this paper are the floats in the Gion Festival in Kyoto(the float parade is on the UNESCO Intangible Cultural Heritage List) and Borobudur Temple in Indonesia(a UNESCO World Heritage Site).

关键词： 3D scanning point cloud transparent visualization noise transparentization cultural heritage object

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