Search Results 1-20 of 71

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  • Topographic Survey by UAV at the Foot of Unzen and Sakurajima Volcanoes and its Accuracy  [in Japanese]

    池見 洋明 , 桜井 龍太 , 林田 千聖 , 黒木 貴一 , 宗 建郎 , 馬場 亮 , 津山 貴裕

    日本文理大学紀要 = Bulletin of Nippon Bunri University 48(2), 75-80, 2020-10

  • Coseismic Uplift of Iwami-Tatamigaura during the 1872 Hamada Earthquake:——Survey of Emerged Sessile Assemblage and Topography——  [in Japanese]

    SHISHIKURA Masanobu , NAMEGAYA Yuichi , MAEMOKU Hideaki , ECHIGO Tomoo

    … <p>This paper describes that Iwami-Tatamigaura was uplifted during the 1872 Hamada earthquake based on the analysis of the height and ages of emerged sessile assemblage, and topographic data. … In two sea caves located in the northern part of the survey area, we observed the emerged sessile assemblage, which consists mainly of calcareous tubeworm, <i>Pomatoleios kraussii</i>, and collected samples for <sup>14</sup>C dating and measured their altitude referring against the Tokyo Peil (T.P.). …

    Zisin (Journal of the Seismological Society of Japan. 2nd ser.) 73(0), 159-177, 2020

    J-STAGE 

  • Improving River Bathymetry and Topography Representation of a Low-Lying Flat River Basin by Integrating Multiple Sourced Datasets

    Bhagabati Seemanta Sharma , Kawasaki Akiyuki , Takeuchi Wataru , Zin Win Win

    … <p>Topography represented in the form of Digital Elevation Models (DEMs) has profound applications in hydrological modeling. … DEMs can be generated from several sources including satellite products, contours, survey data, and LiDAR, each with their own merits and demerits. … The inputs are: (a) a 10 m DEM, developed using contour data, point elevation data, and UTM topographic maps; …

    Journal of Disaster Research 15(3), 335-343, 2020

    J-STAGE 

  • Accuracy Verification of UAV-SfM Survey of Terrace Paddy Fields in a Hilly and Mountainous Area

    YAMAZAKI YURI , OKAZAWA HIROMU , SEKIYAMA AYAKO , FUJIKAWA TOMONORI

    … Recently, the Geospatial Information Authority of Japan announced a survey manual using Unmanned Aerial Vehicles (UAV). … The UAV-Structure from Motion (SfM) system has accumulated a great deal of accuracy verification information from the topographic survey, and it is expected that in the future UAV surveying and mapping will be expanded in scope. …

    International Journal of Environmental and Rural Development 10(1), 153-159, 2019

    J-STAGE 

  • Paleoseismological trenching and detailed mapping of the surface rupture appeared along the Kita-amagi fault during the 2016 Kumamoto earthquake at Shimada, Mashiki Town, Kumamoto Prefecture, southwest Japan  [in Japanese]

    Maruyama Tadashi , Saito Masaru , Komine Yusuke , Kametaka Masao

    … In order to unravel recent behavior of the Kita-amagi fault, including the 2016 earthquake, we performed detailed topographic survey and paleoseismic trenching of the southern trace of the Kita-amagi fault that bounds the northwestern margin of the Kita-amagi Uplands. …

    Active Fault Research 2019(50), 13-31, 2019

    J-STAGE 

  • Estimation of the displacements of Agatsu landslide in Kitakata-shi by Differential LiDAR Survey, and 3D-Modeling from aerial oblique photographs for emergent survey of Yabakei landslide in Nakatsu-shi  [in Japanese]

    MUKOYAMA Sakae , SATO Takumi , TAKAMI Tomoyuki

    … <p>Today's high-definition topographic data analysis and SfM 3D-Modeling technology is effective for measurement of ground displacement and estimation of landslide area. … In this study, Digital Geomorphic Image Matching analysis using differential LiDAR DEMs was applied to measure wide-area ground displacements of landslide. … High-definition topographic data quickly made from aerial oblique photographs was effective for emergency planning for countermeasure work.</p> …

    Journal of the Japan society of photogrammetry and remote sensing 57(6), 268-270, 2018

    J-STAGE 

  • Large sediment discharge caused by periglacial slope failures and erosion induced by Typhoon Lionrock (2016) in Pekerebetsu Creek, Hokkaido, Japan  [in Japanese]

    MIYAZAKI Tomoyoshi , OSANAI Nobutomo , SAWADA Masayo , MATSUOKA Naoki , TACHIKAWA Yoshimichi , TAKASHIMA Shigenori , YOSHIDA Yasunori , HAYASHI Shin-ichiro , FURUICHI Takahisa , KASAI Mio

    … This study aims to find relationships between the sediment discharge and its control factors such as sediment supply and deposition, topographic features and bed materials. … Digital aerial photographs were taken immediately after the event and were analyzed through comparison both with other aerial photographs taken of the same area and a 10 m digital terrain model simulated before the event. …

    Journal of the Japan Society of Erosion Control Engineering 71(2), 22-33, 2018

    J-STAGE 

  • VERIFICATION OF MEASUREMENT ACCURACY OF TIDAL FLAT TOPOGRAPHY BY UAV AND APPLICABILITY TO CONTINUOUS MONITORING OF TIDAL FLAT  [in Japanese]

    TABATA Takahiro , KATO Shigeru , NAKAMURA Ryota , ODA Toshihiro , NISHIZONO Hiroki , OKABE Takumi

    干潟環境のモニタリングには,その形成基盤である地形を高精度に計測することが必要不可欠であるが,潮の満ち引きによって調査範囲および時間が制約される中で,適切な調査を実施することは様々な困難を伴う.また,近年では海岸工学分野でもUAVによる地形計測が活用されているが,非常に平坦な領域である干潟での活用において計測精度の詳細な検討はほとんど報告されていない.そこで本研究では,内側標定点の増設,重複率の増 …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74(2), I_961-I_966, 2018

    J-STAGE 

  • Assessment of steep slope movements using point cloud data:-For preliminary survey of slope maintenance-  [in Japanese]

    KIKUCHI Teruyuki , HATANO Teruyoshi , SENDA Yoshimichi , NISHIYAMA Satoshi

    <p> 近年増加する斜面災害において急斜面からの岩盤崩落や落石は,要点検箇所に抽出されていない場合でも発生する報告がなされている。急斜面の維持管理においては概要調査に相当する落石や落石発生源の有無を確認することが重要であるが,植生や立地上の問題から難しい。概要調査を効率よく実施するためには,詳細な地形情報を取得することが重要であり,性能向上が著しいレーザ計測が公共測量や地すべりなどの斜 …

    Journal of the Japan Landslide Society 55(2), 65-71, 2018

    J-STAGE 

  • <Technical Report> Measurement Accuracy Verification of UAV-SfM Technique for River Bed Forms in a Mountain River Basin:  [in Japanese]

    上治 雄介 , 山川 陽祐 , UEJI Yusuke , YAMAKAWA Yosuke

    山地河川において河床形状測量を行う上で無人航空機(UAV)および多視点ステレオ写真測量(SfM)を組み合わせた手法(UAV-SfM手法)によって作成される数値表面モデル(DSM)およびオルソ画像の精度を、全地球測位衛星システム(GNSS)およびレーザー距離計を用いた実測値との比較により検証した。GNSSを用いて測量した地上基準点(GCP)を真値としてオルソ画像から読み取った推定値との差分を平均二乗 …

    筑波大学農林技術研究 = Tsukuba Journal of Agricultural and Forestry (5), 9-19, 2017-03-31

    IR 

  • Unmanned Aerial Vehicle (UAV)-based Survey in Antarctica for High-definition Topographic Measurements  [in Japanese]

    SUGANUMA Yusuke , KAWAMATA Moto , SHIRAMIZU Kaoru , KOYAMA Takushi , DOI Koichiro , KANEDA Heitaro , AOYAMA Yuichi , HAYAKAWA Hideaki , OBANAWA Hiroyuki

    … <p> Unmanned aerial vehicle-based "Structure from Motion" (UAV-SfM) photogrammetry is becoming increasingly important for obtaining high-definition topographic data in a variety of earth science research. … A digital elevation model (DEM) obtained in central Dronning Maud Land clearly shows 3D structures of polygons developed on glacial tills. …

    Journal of Geography (Chigaku Zasshi) 126(1), 1-24, 2017

    J-STAGE 

  • Analysis for a Landslide Dam Outburst Flood in Ambon Island, Indonesia

    ISHIZUKA Tadanori , KAJI Akihito , MORITA Koji , MORI Toshio , CHIBA Miki , KASHIWABARA Yoshiaki , YOSHINO Kosuke , UCHIDA Taro , MIZUYAMA Takahisa

    … In this disaster, the information on the topographic changes before and after the dam failure was obtained from digital maps (DEM) based on satellite images and field measurement. …

    International Journal of Erosion Control Engineering 10(1), 32-38, 2017

    J-STAGE 

  • Red relief image map and integration of topographic data in and around the Japan Sea  [in Japanese]

    No Tetsuo , Hiramatsu Takahiro , Sato Takeshi , Miura Seiichi , Chiba Tatsuro , Kamiyama Saeko , Iki Shinji , Kodaira Shuichi

    … 展にもつながる.その結果,日本海における地震活動・活構造と地殻構造の関係をより統合的に研究を推進することができる.本報告では,地震探査時に取得された海底地形データを加えた日本海全域及びその周辺の地形データを用いて,それらを統合したDEM(数値標高モデル:Digital Elevation Model)データを作り,さらにそのデータを用いて方向依存性のない立体感が得られる赤色立体地図を作製した結果について記す. …

    JAMSTEC Report of Research and Development 22(0), 13-29, 2016

    J-STAGE 

  • 2301 Examination of a risk evaluation method of embankment collapse in case of torrential rain using detailed digital elevation model  [in Japanese]

    NAKAZAWA Akihiro , SOGA Toshitaka , TAKAYAMA Yoshihisa , MISAKI Norikazu , TAKAYAMA Toko , TOCHINO Hiroshi , HANAI Kenta

    … In this study, detailed digital elevation model which indicates topographic feature of formation level and slope of embankment was created using data measured by airborne light detection and ranging (LiDAR) system. … And then, it's possible to extract risk area by analyzing detailed digital elevation model. …

    Jointed railway technology symposium 2015(22), "2301-1"-"2301-4", 2015-12-08

  • Mapping of Fault Geomorphology Using "Structure from Motion - Multi - Video Stereo":Photogrammetry with Old / Hi-view Aerial Photography  [in Japanese]

    GOTO Hideaki

    Digital elevation model (DEM) have been indispensable data for identifying fault traces and measuring the amount of recent faulting. …

    Active Fault Research 2015(42), 73-83, 2015

    J-STAGE 

  • Geology and Evolution of the Nakajima Islands (Toya Caldera, Hokkaido, Japan) Inferred from Aerial Laser Mapping and Geological Field Surveys

    GOTO Yoshihiko , MATSUZUKA Satoru , KAMEYAMA Seiji , DANHARA Tohru

    我々は,北海道洞爺カルデラ中島火山の火山地質を明らかにするため,ヘリコプター搭載型の高分解能レーザースキャナを用いたレーザーマッピングと,地表地質調査を行った.レーザーマッピングは中島の全域を含む3×3kmで行い,計測データから3次元のデジタル地形図を作成した.地表地質調査は3次元デジタル地形図を用いて中島の全域で行い,詳細な産状記載と岩石記載を行った.デジタル地形図と地表地質調査から,中島の詳細 …

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 60(1), 17-33, 2015

    J-STAGE 

  • Analysis of Topographic Characteristics of Ancient Dunes and Old Fans using a DEM based on Aerial Photographs of the Western Coast of the Noto Peninsula in Central Japan  [in Japanese]

    HATTORI Takashi , HAMADA Masaaki , TAKAYAMA Toko , ONODA Satoshi , SAKASHITA Manabu , YAMAGUCHI Hiroyuki , HIRAMATSU Yoshihiro

    Digital Elevation Models (DEM) are well suited for characterizing the geomorphological features of a landscape. … Using a previous classification of geomorphic surfaces, we then performed a boring survey to characterize the facies of sediments. … Since geomorphic analysis based on current topographic data is highly influenced by the anthropogenic development of landforms, we generated the DEM using aerial photographs that had been taken of the area prior to development in the region. …

    地形 35(4), 331-350, 2014-10

    NDL Digital Collections 

  • 3D Modelling of Inaccessible Areas using UAV-based Aerial Photography and Structure from Motion  [in Japanese]

    OBANAWA Hiroyuki , HAYAKAWA Yuichi S. , GOMEZ Christopher

    … In hardly accessible areas, aerial photogrammetry and laser scanning with manned flight are normally used for topographic measurement. … The 3D model has been constructed by digital photogrammetry using a commercial SfM software which can generate sparse and dense point-clouds, from which polygonal models and orthophotographs can be calculated. … Using the 'flight-log' and/or GCPs (Ground Control Points), the software can generate digital surface model. …

    地形 35(3), 283-294, 2014-07

    NDL Digital Collections 

  • Mapping active faults by using small unmanned aerial vehicle and structure from motion software::A case study on Midori fault scarp formed by the 1891 Nobi earthquake  [in Japanese]

    Uchiyama Shoichiro , Taniguchi Kaoru , Nakata Takashi , Inoue Hiroshi , Kumahara Yasuhiro , Sugita Satoru , Izutsu Jun , Goto Hideaki , Fukui Hiromichi , Suzuki Hinako

    … A digital surface model (DSM) of 0.09 m mesh and an orthophoto with a resolution of 0.03 m were generated from these images by PhotoScan software produced by structure from motion (SfM). … A topographic map with 1 m interval contours and a cross-section profile were processed using a DSM produced by ArcGIS. … We expect that the new technology will be applied to tectonic landform survey and geomorphological research. …

    Active Fault Research 2014(40), 35-42, 2014

    J-STAGE 

  • Topographic models for predicting malaria vector breeding habitats: potential tools for vector control managers

    Nmor Jephtha C , Sunahara Toshihiko , Goto Kensuke , Futami Kyoko , Sonye George , Akweywa Peter , Dida Gabriel , Minakawa Noboru

    … Although associations between malaria vector breeding sites and topography are well recognized, practical models that predict breeding sites from topographic information are lacking. … We used topographic variables derived from remotely sensed Digital Elevation Models (DEMs) to model the breeding sites of malaria vectors. …

    Parasites & Vectors 6(1), 14, 2013-01-16

    IR 

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