Papers - SAWAHIKO Shimada
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Nomadic responses to rainfall: Nighttime light evidence from wadis in Djibouti Reviewed International coauthorship International journal
Bouh Omar Ali, Yutaka Ito, Shuichi Oyama, Sawahiko Shimada & Yuki Yamamoto
Scientific African 25 e02337 2024.09
Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier B.V.
This study examined how precipitation affects human activity in dry areas, focusing on Djibouti's nomads. Using satellite data, researchers found increased nighttime light brightness near wadis after rainfall, indicating higher nomadic activity. This effect decreased with distance from wadis and was absent in urban areas. The findings highlight water's crucial role in nomadic settlements and resource management, providing valuable insights for policymakers in African countries.
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Comprehensive Analysis of Land Use and Cover Dynamics in Djibouti Using Machine Learning Technique: A Multi-Temporal Assessment from 1990 to 2023 Reviewed International coauthorship International journal
Pandit S, Shimada S & Dube T
Environmental Challenges 15 100920 2024.04
Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier
The study focuses on analyzing land use changes in Djibouti from 1990 to 2023 using remote sensing and machine learning techniques. We identified seven major land cover classes shows declines in mangroves and farmland, and highlights expansions in built-up areas, water bodies, and barren lands over time.
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High‑resolution mapping of seasonal snow cover extent in the Pamir Hindu Kush using machine learning‑based integration of multi‑sensor data International journal
Abdul Basir Mahmoodzada, Pragyan Das, Divyesh Varade, Mohd Arslaan Akhtar, Sawahiko Shimada
Acta Geophysica 71 ( 6 ) 2024.01
Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Link
This study proposes a framework to develop high-resolution snow cover area (SCA) products using freely available Sentinel-1 and MODIS data. Various Sentinel-1 parameters sensitive to snow are integrated with resampled MODIS normalized difference snow index (NDSI) data to estimate an equivalent NDSI for determining 15m resolution SCA. Equivalent NDSI is derived using machine learning regression with support vector machines (SVMs) and multilayer perceptron (MLP). Experiments were performed for northern Hindu Kush mountain regions in February and March 2019. SCA evaluation used thresholded NDSI from Landsat-8. SVM regression showed better SCA performance over MLP. Both SVM and MLP improved snow classification accuracy over resampled MODIS NDSI alone, with higher mean conditional kappa coefficients.
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Quantification of Amu River Riverbank Erosion in Balkh Province of Afghanistan during 2004–2020 Reviewed International journal
Abdul Basir Mahmoodzada, Divyesh Varade, Sawahiko Shimada, Hiromu Okazawa, Shafiqullah Aryan, Gulbuddin Gulab, Abd El-Zaher M. A. Mustafa, Humaira Rizwana, Yogesh K. Ahlawat and Hosam O. Elansary
land 12 ( 10 ) 1890 2023.10
Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI
This study quantifies riverbank erosion along the Amu River in Afghanistan's Kaldar District from 2004-2020 using modeled river discharge data. A framework integrating multi-source data models erosion area based on: river discharge, river width, and erosion area. Discharge was modeled using ECMWF and ground data. River width was manually determined from Landsat imagery. Erosion area was calculated through shoreline analysis. From 2008-2020, average annual erosion was 5.4 km2, totaling 86.3 km2 during 2004-2020 due to flooding. Peak erosion occurred in 2008-2009, 2011-2012 and 2015-2016. Erosion area correlated linearly with discharge intensity and stream power (R2=0.84).
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FRACTURE-FAULT DETECTION USING DEEP LEARNING WITH STEPWISE ELIMINATION FROM SATELLITE IMAGES IN DJIBOUTI Reviewed International coauthorship International journal
Rubanga DP, May-Cuevas SA, Arvelyna Y & Shimada S
International Journal of GEOMATE 25 ( 108 ) 241 - 248 2023.08
Authorship：Last author Language：English Publishing type：Research paper (scientific journal)
This study focuses on accurately detecting fracture-fault structures in Djibouti using WV-3 high resolution imagery. A deep learning approach using a deep convolutional neural network (Deep-CNN) model is proposed. The model successfully identifies fracture-fault lines, contributing to sustainable water management and improving water security in Djibouti.
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THE CHARACTERISTICS AND DISTRIBUTION OF DEEP GROUNDWATER IN DJIBOUTI Reviewed International journal
Asakura Y, Shimada S, Hinokidani K, & Nakanishi Y
International Journal of GEOMATE 24 ( 104 ) 93 - 100 2023.04
Language：English Publishing type：Research paper (scientific journal)
This study examines the characteristics of groundwater quality in Djibouti using ion chromatography, stable isotope ratios of hydrogen and oxygen, and tritium concentrations. The results show that most groundwater samples are mixed with seawater or hot spring water and fossil seawater, and the concentration of NO3- is high at some sites.
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FAULT DETECTION USING PALSAR-1/2 IMAGE DATA FOR GROUNDWATER ANALYSIS IN CENTRAL AND SOUTHWEST OF DJIBOUTI Reviewed International coauthorship International journal
Arvelyna Y, Shimada S, May Cuevas S A, & Malow F A
International Journal of GEOMATE 24 ( 104 ) 109 - 116 2023.04
Language：English Publishing type：Research paper (scientific journal)
This study discusses a study that uses fault mapping to observe the possibility of fault-driven groundwater flow in Djibouti using PALSAR-1 and 2 data. The Geology Scoring Index was introduced to analyze the correlation of groundwater data with the geology setting of borehole sites.
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Peatland groundwater level in the Indonesian maritime continent as an alert for El Niño and moderate positive Indian Ocean dipole events Reviewed International coauthorship International journal
Albertus Sulaiman, Mitsuru Osaki, Hidenori Takahashi, Manabu D. Yamanaka, Raden Dwi Susanto, Sawahiko Shimada, Keiji Kimura, Takashi Hirano, Rahmawati Ihsani Wetadewi, Silsigia Sisva, Tsuyoshi Kato, Osamu Kozan, Hideyuki Kubo, Awaluddin Awaluddin & Nobuyuki Tsuji
scientific reports 13 939 2023.01
Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Nature
The condition of Indonesia's peatlands drought and fire can occur before El Niño and after IOD+ peaks. This is attributed to a dropped sea surface temperature anomaly and decreased local rainfall, causing a sharp drop in GWL. The research suggests monitoring GWL variability in peatland to serve as an alert for extreme climate events associated with El Niño and/or moderate IOD+.
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Water resources modeling of the Ali Faren catchment in the Ambouli watershed, Djibouti Reviewed
Hiroyuki TOSAKA, Aurelien HAZART, Toru YORITATE, Sergio Azael MAY CUEVAS, Sawahiko SHIMADA, Yasuhiro NAKANISHI, Fadoumo A. MALOW
Journal of Arid Land Studies 32 ( S ) 313 - 317 2022.12
Language：English Publishing type：Research paper (international conference proceedings)
This study explores the potential of groundwater in Djibouti. A numerical hydrological model and field survey technologies were used to analyze the water cycling in Ali Faren catchment.
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Teruaki IRIE, Shuhei SAITO, Sergio Azael MAY CUEVAS, Shinji SUZUKI, Fumio WATANABE, Sawahiko SHIMADA, Hassan A. BARKAD
Journal of Arid Land Studies 32 ( S ) 193 - 197 2022.12
Language：English Publishing type：Research paper (international conference proceedings)
The study investigated the meteorological conditions of a farm in Dikhil, Djibouti, and evaluated the windbreak effect of hedgerows to plan a pilot farm in Ali Faren based on wind dynamics simulated using observed meteorological parameters.
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Applicability of farmlands detection in Djibouti from satellite imagery using deep learning Reviewed
Takumi SATO, Ayako SEKIYAMA, Syuhei SAITO, Sawahiko SHIMADA
Journal of Arid Land Studies 32 ( S ) 181 - 185 2022.12
Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings)
The study investigated the use of Mask-R-CNN and SVM for farmland detection in Djibouti using Sentinel-2 data.
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Sergio Azael MAY CUEVAS, Denis Pastory RUBANGA, Shuhei SAITO, Ayako SEKIYAMA, Sawahiko SHIMADA, Dayah Aden GUIRREH, Abdillahi Houssein ABDALLAH
Journal of Arid Land Studies 32 ( S ) 165 - 169 2022.12
Language：English Publishing type：Research paper (international conference proceedings)
The study explores the use of Unmanned Aerial Vehicles (UAV) and 3D cloud point data generated in Djibouti. The study found a high accuracy for identifying "Ground" and "High vegetation".
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Preliminary study on improvement of soil water retention characteristics by Spirulina. Reviewed
Shinji SUZUKI, Satoru WATANABE, Abdillahi Ismail OMAR, Fumio WATANABE, Sawahiko SHIMADA
Journal of Arid Land Studies 32 ( S ) 49 - 52 2022.12
Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings)
The study investigates the effect of Spirulina and Extracellular Polymeric Substances (EPS) on the water holding capacity of soil.
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Satoru TANAKA, Shimpei TAKAHASHI, Rikako KIMURA, Sawahiko SHIMADA
Journal of Arid Land Studies 32 ( S ) 19 - 23 2022.12
Language：English Publishing type：Research paper (international conference proceedings)
Using of the GBIF database on plant species in Djibouti , a total of 6982 vascular plants from 561 species were found, representing 71.6% of the species reported in the literature.
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Assessment of Three Automated Identification Methods for Ground Object Based on UAV Imagery
Ke Zhang, Sarvesh Maskey, Hiromu Okazawa, Kiichiro Hayashi, Tamano Hayashi, Ayako Sekiyama, Sawahiko Shimada, Lameck Fiwa
Sustainability 14 ( 21 ) 14603 2022.11
Publisher：MDPI AG
<jats:p>Identification and monitoring of diverse resources or wastes on the ground is important for integrated resource management. The unmanned aerial vehicle (UAV), with its high resolution and facility, is the optimal tool for monitoring ground objects accurately and efficiently. However, previous studies have focused on applying classification methodology on land use and agronomy, and few studies have compared different classification methods using UAV imagery. It is necessary to fully utilize the high resolution of UAV by applying the classification methodology to ground object identification. This study compared three classification methods: A. NDVI threshold, B. RGB image-based machine learning, and C. object-based image analysis (OBIA). Method A was the least time-consuming and could identify vegetation and soil with high accuracy (user’s accuracy > 0.80), but had poor performance at classifying dead vegetation, plastic, and metal (user’s accuracy < 0.50). Both Methods B and C were time- and labor-consuming, but had very high accuracy in separating vegetation, soil, plastic, and metal (user’s accuracy ≥ 0.70 for all classes). Method B showed a good performance in identifying objects with bright colors, whereas Method C showed a high ability in separating objects with similar visual appearances. Scientifically, this study has verified the possibility of using the existing classification methods on identifying small ground objects with a size of less than 1 m, and has discussed the reasons for the different accuracy of the three methods. Practically, these results help users from different fields to choose an appropriate method that suits their target, so that different wastes or multiple resources can be monitored at the same time by combining different methods, which contributes to an improved integrated resource management system.</jats:p>
DOI： 10.3390/su142114603
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Vegetation change in Tokyo's urban forest of Kinuta Park in last 30 years.
Kamimura Shumpei, Hinokidani Ko, Shimada Sawahiko
The Japanese Forest Society Congress 133 ( 0 ) 451 2022.05
Language：Japanese Publisher：THE JAPANESE FORESTRY SOCIETY
<p>[in Japanese]</p>
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Capability assessment of Sentinel-1 data for estimation of snow hydrological potential in the Khanabad watershed in the Hindu Kush Himalayas of Afghanistan Reviewed
Mahmoodzada AB, Varade D, Shimada S, Rezazada FA, Mahmoodzada AS, Jawher AN, Toghyan
Remote Sensing Applications: Society and Environment 26 1 - 11 2022.04
Language：English Publishing type：Research paper (scientific journal)
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Factors Influencing Farmers’ Adoption of Soil Conservation Development Reviewed
Anissa Gara, Edwin P. Mhede, Sawahiko Shimada, Hiromichi Toyoda
Journal of Social Economics Research 7 ( 2 ) 83 - 90 2020.12
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
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Efficiency Evaluation of Solar Pumping System for Wadi Agriculture in Djibouti Reviewed
MAKOTO SHINOZAKI, SAWAHIKO SHIMADA, AYAKO SEKIYAMA, KIYOSHI TAJIMA, HASSAN ALI BARKAD
International Journal of Environmental and Rural Development 11 ( 2 ) 98 - 103 2020.12
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
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Early identification of Tuta absoluta in tomato plants using deep learning Reviewed
Lilian Mkonyi, Denis Rubanga, Mgaya Richard, Never Zekeya, Shimada Sawahiko, Baraka Maiseli, Dina Machuve
Scientific African 10 2020.11
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
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MONITORING THE GROWTH AND QUALITY OF JAPANESE GREEN TEA BY UAV IMAGERY Reviewed
SEKIYAMA A, SATO K, SHIMADA S, FUJIKAWA T
AGROFOR 5 ( 2 ) 27 - 34 2020.10
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
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Estimation of Snow Depth in the Hindu Kush Himalayas of Afghanistan during Peak Winter and Early Melt Season Reviewed
Abdul Basir Mahmoodzada, Divyesh Varade and Sawahiko Shimada
MDPI Remote Sensing 12 ( 17 ) 1 - 21 2020.08
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
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Monitoring of Peatland Ground Surface Subsidence in Central Kalimantan Using In-SAR Imagery Invited Reviewed
Hiroki HASHIMOTO, Yessy ARVELYNA, Sawahiko SHIMADA and Hidenori TAKAHASHI
Journal of The Remote Sensing Society of Japan 40 ( 2 ) 103 - 108 2020.04
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Remote Sensing Society of Japan
<p>Indonesia has ca. 20-27 Mha of peatlands, which function as one of the world’s carbon sinks, since a large amount of carbon is fixed within peat and swamp forests. In recent years, peat swamp forest wildfires have occurred during every El Nino dry season in Central Kalimantan, Indonesia, resulting in the emission of a large amount of carbon dioxide. In this study, we derived peatland ground surface subsidence maps, which can be used as fire hazard maps, using 5 time-series scenes of ALOS-2/PALSAR-2 SAR image data taken between April 2015 and October 2016.</p>
DOI： 10.11440/rssj.40.103
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Greening desert in Djibouti - SATREPS project form implementation of sustainable agro-pastoral systems- Invited
Sawahiko SHIMADA, Yasuhiko NAKANISHI, Rikako KIMURA, Fumio WATANABE, Satoru WATANABE, Yuki YAMAMOTO, Yutaka ITO, Shuichi OYAMA, Fadoumo A. MALOW
Journal of Arid Land Studies 29 ( 2 ) 61 - 67 2019.09
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Monitoring of Riverbank Erosion and Shoreline Movement at Amu River Using Remote Sensing and GIS: A Case Study in Jowzjan, Afghanistan Reviewed
ABDUL BASIR MAHMOODZADA, SAWAHIKO SHIMADA, MUHSIN AZIZI, MASOUD HQBIN, ABDUL SABOOR MAHMOODZADA
International Journal of Environmental and Rural Development 10 ( 1 ) 140 - 145 2019.06
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
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Development of a Simplified Smart Agriculture System for Small-scale Greenhouse Farming Invited Reviewed
Denis Pastory Rubanga, Katsumori Hatanaka, and Sawahiko Shimada
Sensors and Materials 31 ( 3 ) 831 - 843 2019.03
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
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Mapping of Tropical Peatland Area in Central Kalimantan, Indonesia Invited Reviewed
Sawahiko SHIMADA, Hiroki HASHIMOTO and Hidenori TAKAHASHI
Journal of Japan Peat Society 13 ( 1 ) 23 - 28 2018.05
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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SPATIOTEMPORAL ANALYSIS OF SMALL SCALE GREENHOUSE MICROCLIMATE BASED ON SMART AGRICULTURE SYSTEM Reviewed
Denis PASTORY RUBANGA, Katsumori HATANAKA, Sawahiko SHIMADA
AGROFOR International Journal 3 ( 3 ) 56 - 63 2018
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
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Examining day forest dynamic change with times series LANDSAT images (Djibouti) Reviewed
MALOW Fadoumo A., SHIMADA S, SEKIYAMA A
Journal of Arid Land Studies 28 ( S ) 81 - 84 2018
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
DOI： https://doi.org/10.14976/jals.28.S_81
Other Link： https://doi.org/10.14976/jals.28.S_81
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Event-based Rainfall-runoff Simulations using GETFLOWS for Kourtimalei Catchment in Djibouti Reviewed
Malow F.A., Shimada S. and Hazart A.
International Journal of Environmental and Rural Development 8 ( 1 ) 169 - 175 2017.06
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
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Extraction of Near-infrared Information from Aerial Photography Using UAV with Supergel Color Filter Aiming for In-situ Tea Growing Monitoring Invited Reviewed
Journal of The Remote Sensing Society of Japan 36 ( 2 ) 131 - 135 2016.04
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
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Monitoring of Rice Growth Status Using Drone Aerial Photography Invited Reviewed
Journal of The Remote Sensing Society of Japan 36 ( 2 ) 117 - 121 2016.04
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
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EVALUATION OF IMPACT OF EARTHQUAKE ON AGRICULTURE IN NEPAL BASED ON REMOTE SENSING Reviewed
Ayako SEKIYAMA, Kuang TING KUO, Maskey SARVESH, Sawahiko SHIMADA, Hiromu OKAZAWA, Koji MIWA, Machito MIHARA
AGROFOR International Journal 1 ( 1 ) 58 - 65 2016.01
Language：English Publishing type：Research paper (scientific journal)
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Soil and Hydrological Survey for Retrieving the Characteristics of Surface Runoff on Kourtimalei Reservoir Watershed in Djibouti Reviewed
Toyoda H, Shimada S, Hirokane T, Sekiyama A, Malow FA, Hotta T, Menjo M, Suzuki S and Watanabe F
Journal of Arid Land Studies 25 ( 3 ) 241 - 244 2015.12
Language：English Publishing type：Research paper (scientific journal)
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Detection of Grassland Degradation Using MODIS Data in Mongolia. Reviewed
SEKIYAMA A, TAKEUCHI W and SHIMADA S
Journal of Arid Land Studies 24 ( 1 ) 175 - 178 2014.06
Language：English Publishing type：Research paper (scientific journal)
MODIS-LAIプロダクト画像データを用い、モンゴル草地のバイオマス量を推定し、これと2000-2006年の家畜頭数統計データとの関係性から広域な草地劣化地域を特定した。
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Effects of Water and Salinity Stress on the Growth of Iceplant. Reviewed
HIROKANE T, OOBA M, SHIMADA S and TOYODA H
Journal of Arid Land Studies 24 ( 1 ) 161 - 164 2014.06
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
スペクトルメータを用いた非接触によるアイスプラントの水分および塩分ストレス状態の感知を試みた。結果、正規化差植生指数（NDVI）と葉のEC値との関係性が見られ、NDVIによるモニタリングの可能性が示唆された。
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A Study on Effective Use of Surface Runoff for Irrigation in Djibouti - Watershed Analysis using GIS and Trial on Runoff Parameters Estimation - Reviewed
TOYODA H, SHIMADA S, HIROKANE T, ISMAEL TM, HOTTA T and MENJO M
Journal of Arid Land Studies 24 ( 1 ) 253 - 256 2014.06
Language：English Publishing type：Research paper (scientific journal)
ジブチにおける表面流出水を有効利用するために、Kourtimalei地区において行った水文解析について述べた。
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Monitoring Salt Accumulation Status and Saline Stress of Iceplant Leaves. Reviewed
SHIMADA S, HIROKANE T, OOBA M, TOYODA H, ANDO F and TAKARA Y
Journal of Arid Land Studies 24 ( 1 ) 165 - 168 2014.06
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
ハイパースペクトルカメラを用い、塩分ストレスを与えたアイスプラントの非接触モニタリングを試みた。結果、680 nmと500 nm波長部分の反射の差が最もストレスをモニタリングできる手法であることを示した。
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Retrieving of the Land Surface Information of a Catchment in Djibouti Using WorldView-2 and Landsat-8 Imagery. Invited
SHlMADA S, MALOW FA, HOTTA T, MENJO M, HIROKANE T, SUZUKI S, WATANABE F and TOYODA H
Journal of Arid Land Studies 23 ( 4 ) 247 - 250 2014.03
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Trial for Effective Use of Local Resources such as Rainwater, Vegetation in East Africa Drylands -Summary of the Strategic Research Project in Tokyo Nodai- Invited
TOYODA H, SHlMADA S, SUZUKI S, TACHlBANA R, SANADA A, HIROKANE T, TAJlMA K and WATANABE F
Journal of Arid Land Studies 23 ( 4 ) 229 - 233 2014.03
Language：Japanese Publishing type：Research paper (scientific journal)
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Comparison between temperature gradient and heat flux plate methods and effect of heat storage for determination of soil heat flux at near soul surface. Reviewed
J. Jpn. Soc. Soil Phys. 124 35 - 42 2013.07
Language：Japanese Publishing type：Research paper (scientific journal)
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A new spectral index to detect Poaceae grass abundance in Mongolian grasslands. Reviewed
Shimada, S., Matsumoto, J., Sekiyama, A., Aosier, B., Yokohana, M.
Advances in Space Research 50 ( 9 ) 1266 - 1273 2012.11
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
モンゴル草地における、比較的家畜動物の嗜好性が高いイネ科を反射スペクトル情報から、その占有率を把握するための指数を開発した論文である。
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Developing the monitoring method for plant water stress using spectral reflectance measurement. Reviewed
Shimada, S., Funatsuka, E., Ooba, M., Takyu, M., Fujikawa, T, and Toyoda, H.
Journal of Arid Land Studies 22 ( 1 ) 251 - 254 2012.06
Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings)
植物の乾燥ストレスを無破壊で推定する手法として、スペクトルメータを用いた反射スペクトルのうち490nmと620nmの正規化差指数が最も有効である（r=0.86）ことを示した。
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Developing an index for determining the optimal harvest timing of Lagenaria siceraria. Reviewed
Toyoda, H., Shimada, S., Kurosu, C., Ooba, M.
Journal of Arid Land Studies 22 ( 1 ) 259 - 262 2012.06
Language：English Publishing type：Research paper (international conference proceedings)
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Simple solar still using solar energy and compost heat for family use. Reviewed
Kikuchi, S., Toyoda, H., Takami, A., Shimada, S., Ooba, M., Sekiyama, T.
Journal of Arid Land Studies 22 ( 1 ) 207 - 210 2012.06
Language：English Publishing type：Research paper (international conference proceedings)
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Grassland vegetation and palatability in Mongolian grasslands Reviewed
Yokohama M., Shimada S., Sekiyama A., GOMBOJAV A. and ARIUNSUREN P.
Journal of Agriculture Science, Tokyo University of Agriculture 56 ( 3 ) 203 - 211 2011.12
Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
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Soil Erosion Assessment Using USLE in East Shewa, Ethiopia Reviewed
Anissa GARA, Shinji Suzuki, Fumio WATANABE, Sawahiko SHIMADA and Hiromichi Toyoda
東京農業大学集報 56 ( 1 ) 1 - 8 2011.06
Authorship：Corresponding author Language：English Publishing type：Research paper (bulletin of university, research institution)
エチオピア国オロミア地域の東ショワ地帯を対象として，土壌流亡予測式(USLE)と地理情報システム(GIS)を統合することにより，広域的な土壌侵食の危険性を明らかにした。
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GIS and USLE integration for soil erosion assessment in East Shewa, Ethiopia
Anissa GARA, Hiromichi TOYODA, Sawahiko SHIMADA
環境情報科学 40 ( 1 ) 102 - 103 2011.03
Authorship：Corresponding author Language：English Publishing type：Research paper (other academic)
エチオピア国オロミア州東シェワ地帯において、USLE式をもちいて土壌流亡量を推定しGISにより広域適用をした研究である。
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A possibility of an index of NDVI and SPAD to estimate protein contents of rice Reviewed
Akina ASANUMA, Hiromichi TOYODA, Sawahiko SHIMADA and Ichio ASANUMA
Journal of the Japan Society of Photogrammetry and Remote Sensing 50 ( 1 ) 34 - 39 2011.01
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
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Estimation of Soil Moisture Using Pattern Decomposition Method and Vegetation Survey in Mongolian Grassland Reviewed
A. Sekiyama, S. Shimada, H. Toyoda and M. Yokohama
Journal of Agriculture Science, Tokyo University of Agriculture 55 ( 1 ) 63 - 69 2010.06
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
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可視・近赤外域分光反射特性を用いた土壌水分推定
関山絢子・島田沢彦・豊田裕道・横濱道成
沙漠研究 19 ( 4 ) 525 - 535 2010.01
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
衛星画像データでの適用を想定し、可視・近赤外線域4バンドの地表面土壌反射率情報から土壌水分を推定するための手法を開発した。
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Long-term-discharge analysis using the EPA method for the Tana River in Kenya.
H. Okazawa, H. Toyoda, S. Suzuki, S. Shimada and R. Nishimaki
Journal of Arid Land Studies 19 ( 1 ) 57 - 60 2009.06
Language：English Publishing type：Research paper (scientific journal)
ケニア・タナ河における52年間の水文データから、長期間の流出量の傾向を明らかにした。
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Relationship between vegetation and topography for an erosion management in Ethiopia.
A. Gara, S. Shimada, H. Toyoda, H. Okazawa, S. Suzuki and A Ghrabi
Journal of Arid Land Studies 19 ( 1 ) 257 - 260 2009.06
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
シャトルレーダー（SRTM）による数値標高モデル（DEM）とUSGSのGLCC地表面被覆分類図を用い、エチオピアにおける土地被覆と地形との関係を明らかにした。
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GIS analysis of grazing selection by goats in Tov Province, Mongolia.
S. Shimada, H. Yokoyama, A. Sekiyama, B. Aosier and M. Yokohama
Journal of Arid Land Studies 19 ( 1 ) 29 - 32 2009.06
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
放牧家畜の採食行動と草地環境との関係性を明らかにするために、2003-2007年夏季、モンゴル中央県においてGPSを放牧ヤギに搭載し、その行動と衛星から得られるNDVIや地形との関係性について論じた。
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ネリカ普及にむけた半乾燥地における"連結ため池灌漑システム"の適用可能性－エチオピアにおける灌漑水収支シミュレーションによる検証－
北中真人・堀田朋樹・西牧隆壯・鈴木伸治・島田沢彦・高橋悟
沙漠研究 18 ( 3 ) 81 - 89 2008.12
Language：Japanese Publishing type：Research paper (scientific journal)
連結ため池灌漑システムの利用によりエチオピア半乾燥地域におけるネリカの栽培可能性を気象データを基に水収支モデルを用い検証した。
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網走川水系における農業的土地利用と河川の窒素・リン濃度の関係
岡澤宏・豊田裕道・島田沢彦・鈴木伸治・竹内康
農業農村工学会論文集 ( 258 ) 45 - 50 2008.12
Language：Japanese Publishing type：Research paper (scientific journal)
北海道網走川水系において、土地利用が河川水質に及ぼす影響を検討した。その結果、畑草地における余剰窒素が河川汚濁に大きく起因することを明らかにした。
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リモートセンシング画像を用いたモンゴル草地における植被率と土壌水分量の推定手法開発
島田沢彦・関山絢子・横濱道成・布和敖斯・玉木浩二
沙漠研究 17 ( 2 ) 77 - 80 2007.09
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
モンゴル草地における植被率および土壌水分を衛星画像のようなマルチスペクトルデータを用いて推定する手法を開発した。手法にはパターン展開法を用いた。土壌水分推定においては、エンドメンバー（パターン成分）にフラットモデルパターンを考案した。
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衛星画像データを活用した乾燥地緑化ポテンシャルの評価
島田沢彦・箭内多聞・豊田裕道・田島淳・高橋新平
沙漠研究 17 ( 1 ) 29 - 32 2007.06
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
ジブチにおける植生の生えうる可能性の度合を乾燥地緑化ポテンシャルと定義し、これを評価した。ジブチ国土を地形水文環境の特徴から集約集水域に区分し、LANDSAT-ETM+（2000/5/13撮影）の画像データを用い、乾燥地緑化ポテンシャルが比較的高い地域を抽出した。
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Utilization of multi-temporal MODIS EVI data as a parameter of peatland environmental characteristics in Central Kalimantan, Indonesia.
Shimada, S., Oba, Y. and Takahashi, H.
Environmental Conservation and Land Use Management of Wetland Ecosystem in Southeast Asia , 2007 issue, Hokkaido Univ., Japan 125 - 129 2007.03
Authorship：Lead author Language：English Publishing type：Research paper (bulletin of university, research institution)
多時期衛星画像MODISの16-days植生指数データEVIを用い、インドネシア・中央カリマンタンにおける熱帯泥炭地の地下水位変動の推定に利用することを目的に、これらの関係性について解析した。
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鉛直電気伝導度センサの利用方法-塩類集積地域における3次元塩類分布の把握-
洪寧基（HONG Youngki）・樹野淳也・島田沢彦・中村貴彦・田島淳・玉木浩二
植物環境工学 18 ( 4 ) 2006.12
Language：Japanese Publishing type：Research paper (scientific journal)
塩害発生地域であるタイ国東北部コンケンにおいて，試作鉛直型電気伝導度センサにより，3次元的な塩類動態を経時的に把握する手法開発を試みた。その結果，試作センサを用い，地域レベルで電気伝導度の3次元分布の推定が可能であることを示した。
担当は解析 -
Factors acidifying peat in Central Kalimantan, Indonesia.
Haraguchi, A., Akioka, M., Shimada, S. & Iyobe, T.
TROPICS 15 ( 4 ) 397 - 402 2006.09
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
中央カリマンタンにおける泥炭地のpH値に注目し，低pH値に起因する化学的特性を考察した論文である。
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Hydroperiod and phenology prediction in a Central Kalimantan peat swamp forest by using MODIS data.
Shimada, S., Takahasi, H. and Limin, H. S.
TROPICS 15 ( 4 ) 419 - 424 2006.09
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
monthly MODIS-NDVIデータを用い、中央カリマンタンの泥炭地の植生をフェノロジータイプに分類し、その分類タイプごとの地形環境の解析を行った。
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農村地域における水田を利用した震災時の避難労力低減効果
佐村公・岡澤宏・島田沢彦・中村好男
農業土木学会論文集 ( 242 ) 2006.04
Language：Japanese Publishing type：Research paper (scientific journal)
農村地域において震災時の地域避難所までの避難労力をGISを用い評価した。水田を避難経路として考慮することにより、避難経路面積が道路のみを考慮した場合の4倍になることを示し、避難労力低減に効果があることを明らかにした。
担当は解析 -
The spectral characteristics of the fire-damaged peatland surface in Central Kalimantan, Indonesia: 3. Monitoring three years vegetation recovery.
Shimada, S., Takahashi,H., Sekiyama, A., Tamaki, K.
Environmental Conservation and Land Use Management of Wetland Ecosystem in Southeast Asia , 2006 issue, Hokkaido Univ., Japan 127 - 130 2006.03
Authorship：Lead author Language：English Publishing type：Research paper (bulletin of university, research institution)
1997年および2000年に被害を受けた泥炭湿地林火災跡地において、2003-2005年の3ヵ年に渡る植生回復モニタリングをスペクトルメータによる地表面反射率により定量化した。NDVI値の変遷モニタリングの結果、若干の植生回復が確認された。
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The characteristics of land-surface spectral reflectance in Djibouti.
Toyoda H., Shimada S., Tajima K and Takahashi S.
Journal of Arid Land Studies 15 ( 4 ) 399 - 402 2006.03
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
ジブチ国土に優占する玄武岩土地被覆地域において、現地観測アルベド値とASTERから算出したSAVI値との間に正の相関関係があることを明らかにした。また、この関係からアルベド値のみでは分類できなかった土漠地表面地域と植生被覆地域とを区分可能である事を示した。
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Comparison between basin and furrow irrigation in terms of appropriate water use.
Nishimaki R., Okada Y., Toyoda H., Shimada S., and Takahashi S.
Journal of Arid Land Studies 15 ( 4 ) 329 - 332 2006.03
Language：English Publishing type：Research paper (scientific journal)
熱帯乾燥地農業において、水盤灌漑よりも畝間灌漑が蒸発による水損失が抑えられる事を明らかにした。
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Evapotranspiration and irrigation of Zoysia matrella Merr.
Takahashi S., Sugioka K., Shimada S., and Tajima K
Journal of Arid Land Studies 15 ( 4 ) 321 - 324 2006.03
Language：English Publishing type：Research paper (scientific journal)
裸地状態の地表面よりも草本被覆地表面の方が蒸発散量が少ない事を明らかにした。
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The effeciency and improvement of simple distillation device by solar energy.
Tajima K., Watanabe F., Shimada S., Takahashi S. and Sekiyama T.
Journal of Arid Land Studies 15 ( 4 ) 287 - 290 2006.03
Language：English Publishing type：Research paper (scientific journal)
空気中から水を獲得するための簡易蒸留装置を開発し、この装置の最も効率的な運転環境（Airflow Rate = 12-13 m3h-1）を把握した。
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Monitoring the land surface changes of Djibouti using LANDSAT images.
Shimada S., Toyoda H., Takahashi S., Tajima K and Takahashi S.
Journal of Arid Land Studies 15 ( 4 ) 387 - 390 2006.03
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
ジブチにおいて1985年と2000年におけるLANDSAT画像を比較した。2時期衛星画像を比較可能とするために、大気補正後、大バラ沙漠の地表面反射率グランドトゥルースデータを用い補正を行った。2画像のNDVIおよびSAVIの比較により、15年間において著しい沙漠化は認められなかった。
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ジブティ共和国におけるアグロフォレストリー導入による作物生産条件改善の可能性
豊田裕道、渡邉文雄、田島淳、富沢彰之、高橋悟
沙漠研究 14 ( 4 ) 2005.03
Language：Japanese Publishing type：Research paper (scientific journal)
ジブティにおける気象データからアグロフォレストリーの可能性について論じた。
担当は技術的関与 -
The spectral characteristics of the fire-damaged peatland surface in Central Kalimantan, Indonesia 2. Monitoring peat moisture and vegetation recovery.
Shimada, S., Takahashi, H., Sekiyama, A. ＆ Tamaki, K.
Environmental Conservation and Land Use Management of Wetland Ecosystem in Southeast Asia , 2005 issue, Hokkaido Univ., Japan 167 - 172 2005.03
Authorship：Lead author Language：English Publishing type：Research paper (bulletin of university, research institution)
森林火災跡の泥炭表層における反射率を分光放射計により測定し，反射率特性から泥炭土壌水分量を推定することを試みた論文である。
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Does pyrite oxidation contribute to the acidification of tropical peat? ― a case study in a peat swamp forest in Central Kalimantan, Indonesia.
Haraguchi, A., Akioka, M. & Shimada, S.
Nutrient Cycling in Agroecosystems 7１ ( 1 ) 101 - 108 2005.01
Language：English Publishing type：Research paper (scientific journal)
内陸に存在する熱帯泥炭地において，pH値が非常に低いのは，硫酸酸性物質によるものではない事を明らかにした。
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The spectral characteristics of the fire-damaged peatland surface in Central Kalimantan, Indonesia.
Shimada, S., Takahashi, H. and Tamaki, K.
Environmental Conservation and Land Use Management of Wetland Ecosystem in Southeast Asia , 2004 issue, Hokkaido Univ., Japan 125 - 130 2004.03
Authorship：Lead author Language：English Publishing type：Research paper (bulletin of university, research institution)
森林火災跡の泥炭表層における反射率を分光放射計により測定した。正規化差植生指数(NDVI)やパターン展開法による指数を用いて地表面の分光反射率特性を明らかにすることを試みた論文である。
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多時期衛星画像を用いたインドネシア・中央カリマンタンの湿地林ピート層厚の推定
島田 沢彦
草炭研究 2 ( 1 ) 2003.07
Language：Japanese Publishing type：Research paper (scientific journal)
泥炭層厚を推定するために多時期の衛星画像を用いた解析を行い，衛星画像が推定に非常に有効である事を明らかにした論文である。pp.26-33
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Peat water content under low groundwater condition of the 2002 dry season in Central Kalimantan, Indonesia.
Shimada, S., Takahashi, H. & Usup, A.D.
Environmental Conservation and Land Use Management of Wetland Ecosystem in Southeast Asia, 2003 issue, Hokkaido Univ., Japan, 141 - 146 2003.03
Authorship：Lead author Language：English Publishing type：Research paper (bulletin of university, research institution)
2002年に発生したエルニーニョの影響による，低地下水位下での泥炭土の含水率特性を地下水位との関係から明らかにした。
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Prediction of the hydroperiod and phenology of a peat swamp forest in Central Kalimantan using MODIS data.
Shimada, S. Takahashi, H. & Limin, S. H.
In: Proceedings of the International Symposium on Land Management and Biodiversity in Southeast Asia, Suda Printing Co., Ltd. 485 - 491 2003.03
Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings)
中央カリマンタンの泥炭地における植生と湛水周期との関係を2001年2月から2002年1月のTERR-MODIS衛星画像を用い明らかにした。
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Chemical properties of peat pore water in Central Kalimantan, Indonesia: with special reference to its acidification process
Haraguchi, A., Akioka, M., Shimada, S. & Iyobe, T.
Environmental Conservation and Land Use Management of Wetland Ecosystem in Southeast Asia, 2003 issue, Hokkaido Univ., Japan 23 - 27 2003.03
Authorship：Lead author Language：English Publishing type：Research paper (bulletin of university, research institution)
泥炭間隙水の化学的特性に関して，中央カリマンタンの熱帯泥炭地と，道東地方の温帯泥炭地を比較した。
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The carbon content characteristics of tropical peats in Central Kalimantan, Indonesia: estimating their spatial variability in density
Shimada, S., Takahashi, H., Haraguchi, A. and Kaneko, M.
Biogeochemistry 53 ( 3 ) 249 - 267 2001.05
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
インドネシア・中央カリマンタンにおける，熱帯泥炭の炭素含有特性について論じた論文である。NOAA/ AVHRRを用いた土地被覆図と泥炭地タイプ等からの単位体積炭素含有量を推定した。
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Annual and diurnal changes in ground water table and ground surface in a tropical peat swamp forest.
Takahashi, H., Shimada S., Ibie B.F., Usup A.D-J., Yudha, Limin S.H.
Environmental Conservation and Land Use Management of Wetland Ecosystem in Southeast Asia, Annual Report, Hokkaido Univ., Japan, 209 - 214 2001.03
Language：English Publishing type：Research paper (bulletin of university, research institution)
インドネシア・中央カリマンタンの熱帯泥炭湿地林における地下水位を7年間にわたりモニタリングした結果を考察した論文である。日中の地下水位の有効減少幅は正午から2-4時間後に最大になる事が明らかになった。
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Distribution of peat and its chemical properties around Lahei in the catchment of the Mangkutup River, Central Kalimantan.
Haraguchi, A, Shimada, S. and Takahashi, H.
TROPICS 10 ( 2 ) 265 - 272 2000.12
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
インドネシア中央カリマンタン州都パランカラヤの北東に位置するLahei近郊のMangkutup川流域において，泥炭の分布とその化学的な特性についての調査を行った。結果から，泥炭層下には基底流があり，それによって塩や酸素の泥炭層下部への供給が起こっている可能性が示唆された。
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The estimation of carbon resource in a tropical peatland: A case study in Central Kalimantan, Indonesia.
Shimada, S. Takahashi, H., Kaneko, M. and Haraguchi, A.
In: Proceedings of the International Symposium on: Tropical Peatlands. Bogor, Indonesia 1999, Hokkaido Univ., Japan 9 - 18 2000.01
Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings)
中央カリマンタンの熱帯泥炭地における蓄積炭素量を推定した。中央カリマンタンにおいて泥炭深を地形パラメータから重回帰分析により推定し，総泥炭体積を算出した。
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Analyses of the second layer of peat swamp.
Togura, S., Shimada, S., Tamura, H., Takahashi, H. and Nishi, N.)
In: Proceedings of the International Symposium on: Tropical Peatlands. Bogor, Indonesia 1999, Hokkaido Univ., Japan 3 - 8 2000.01
Language：English Publishing type：Research paper (international conference proceedings)
中央カリマンタンの台地上泥炭地における泥炭層下の珪砂の元素成分をX線回折・蛍光X線分析により分析した。高純度のSiと微量のTiが確認された。
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Chemical property of peat pore water in Central Kalimantan with special reference to vertical profile.
Haraguchi, A., Shimada, S., Akioka, M., Yabe, K. and Takahashi, H.
In: Proceedings of the International Symposium on: Tropical Peatlands. Bogor, Indonesia 1999, Hokkaido Univ., Japan 41 - 48 2000.01
Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings)
中央カリマンタン，セバンガウ川流域における泥炭間隙水の化学特性について論じたプロシーディングである。
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Effects of dense haze on solar radiation and evapotranspiration of a tropical peat swamp forest in Central Kalimantan, Indonesia.
Takahashi, H., Shimada, S. & Limin, S.H.
Environmental Conservation and Land Use Management of Wetland Ecosystem in Southeast Asia , Annual Report, Hokkaido Univ., Japan 25 - 35 1999.03
Language：English Publishing type：Research paper (bulletin of university, research institution)
1998年，インドネシアの大規模な森林火災により発生したヘーズ(煙霧)による，熱帯泥炭地における日射量と地下水位への影響を論じた。
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インターネットとGISを活用した自然環境保全サポートシステムの構築
金子正美、菅原修、古川康人
北海道環境科学研究センター所報 ( 26 ) 1999.03
Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
北海道環境科学研究センターにおいて開発を進めている自然環境保全サポートシステムについて，GISベースとした情報の表示・提供手法を述べた。
担当はデータ収集・整備および解析