著者

酒井 哲 内野 修 森野 勇 永井 智広 赤穂 大河 川崎 健 奥村 浩 新井 康平 内山 明博 山崎 明宏 松永 恒雄 横田 達也

出版者

社団法人 日本リモートセンシング学会

雑誌

日本リモートセンシング学会誌 (ISSN:02897911)

巻号頁・発行日

vol.34, no.3, pp.197-204, 2014-07-04 (Released:2015-01-27)

参考文献数

15

被引用文献数

2

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Volcanic ash particles originating from the eruptions of Mt. Sakurajima (31.59°N, 130.66°E) were observed with Mie lidar at an altitude of 1.6-2.3 km over Saga (33.24°N, 130.29°E) on 21 and 22 August, 2013. The lidar data showed a high depolarization ratio (10-15 %) and a moderately low backscatter wavelength exponent (0.6-0.7), indicating the presence of supermicrometer-sized nonspherical particles. The aerosol optical thicknesses at 500 nm derived from the skyradiometer were 0.12 on 21 August (13 : 50 LT) and 0.40 on 22 August (12 : 50 LT). The Ångström exponent was 0.16-0.49 and the single scattering albedo was 0.73-0.91, indicating the predominance of supermicrometer-sized and moderately absorbing particles.

著者

原 香実 リュウ ウェン 山崎 文雄

出版者

社団法人 日本リモートセンシング学会

雑誌

日本リモートセンシング学会誌 (ISSN:02897911)

巻号頁・発行日

vol.36, no.4, pp.338-347, 2016-09-20 (Released:2017-03-24)

参考文献数

25

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Synthetic Aperture Radar (SAR) is a very useful tool for detecting surface changes and deformation caused by volcano activities because of its independence from weather and daylight conditions. A volcano in Kuchinoerabu Island, Kagoshima, Japan, erupted explosively and pyroclastic flows reached the coastal area on May 29, 2015. In this study, ALOS-2 PALSAR-2 data were used to analyze surface changes and deformations associated with the eruptive activity. The pyroclastic flows around the Shindake crater were observed by the differences of backscattering coefficients and the coherence values. Changed areas were extracted by a threshold value of the coherence, and were compared with a visual interpretation result conducted by the Geospatial Information Authority of Japan (GSI). The ground deformation due to the eruption was detected by the interferometric analysis, and its vertical component was estimated by combining the results from two InSAR pairs.

著者

土屋 清

出版者

社団法人 日本リモートセンシング学会

雑誌

日本リモートセンシング学会誌 (ISSN:02897911)

巻号頁・発行日

vol.36, no.2, pp.163-166, 2016-04-25 (Released:2016-10-28)

参考文献数

20

著者

吉田 和雄

出版者

社団法人 日本リモートセンシング学会

雑誌

日本リモートセンシング学会誌 (ISSN:02897911)

巻号頁・発行日

vol.17, no.5, pp.405-410, 1997-12-30 (Released:2009-05-29)

著者

新井 康平

出版者

社団法人 日本リモートセンシング学会

雑誌

日本リモートセンシング学会誌 (ISSN:02897911)

巻号頁・発行日

vol.8, no.3, pp.271-278, 1988-09-30 (Released:2009-05-22)

参考文献数

43

著者

早坂 忠裕

出版者

社団法人 日本リモートセンシング学会

雑誌

日本リモートセンシング学会誌 (ISSN:02897911)

巻号頁・発行日

vol.34, no.4, pp.266-277, 2014-09-20 (Released:2015-05-09)

参考文献数

42

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The satellite observation of clouds has been contributing to meteorology and climate change science for more than 50 years. Remote sensing techniques have been developed and improved to obtain quantitative data regarding cloud properties. Quantitative estimation of cloud physical parameters depends on the observation technique used, and even basic cloud properties such as cloud amount and top height are different according to the technique. Therefore, to use the obtained data it is necessary to understand the principle of observation. Active remote sensing provides vertical profiles of clouds, although the coverage is limited to the nadir of the satellite orbit. On the other hand, passive remote sensing with a radiometer can scan a wide swath. The combination of these two sensors produces valuable information on the cloud, as well as on the use of multi-wavelength measurements. A comparison of satellite remote sensing with results of numerical simulation, and data assimilation of satellite data are powerful methods for advancing the understanding of cloud properties, which then impacts meteorology and climate change science.

著者

丹波 澄雄 相馬 孝志 吉田 功 横山 隆三

出版者

社団法人 日本リモートセンシング学会

雑誌

日本リモートセンシング学会誌 (ISSN:02897911)

巻号頁・発行日

vol.8, no.4, pp.381-392, 1988-12-30 (Released:2009-12-11)

参考文献数

13

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陸奥湾海況自動観測ブイシステムによる実測水温データを用いて,AVHRR水温から推定される海表面温度の精度を調べた。Ch.4及びCh.5の輝度温度の二重回帰式では,標準誤差は0.5℃程度で推定できた。2つのスペクトルバンドを用いることによって,大気効果にともなう誤差は効果的に補正できたが,大気一海面の相互作用による誤差は補正できなかった。現在さらにデータ数を増した場合やCh.5のバンドを有していない偶数号(6,8,10号)のNOAAデータの解析も進行中であり,これらの結果を総括してAVHRRから得られる水温情報の精度の総合評価をおこなう予定である。また大気一海面の相互作用と熱放射との因果関係の解明や測定原理の異なる水温情報の利用及び判読についても,今後の研究に待つところが大きい。本研究に用いたAVHRR画像データは東京大学生産技術研究所より,陸奥湾海況自動観測ブイデータは青森県水産増殖センターより,気象観測記録は青森地方気象台から提供された。ここに各位に対し深謝するものである。なお本研究は文部省科学研究費特定研究(1)「宇宙からのリモートセンシングデータの高次利用に関する研究」(昭和60~62年度)によりおこなわれたものである。

著者

夏秋 嶺 渡邉 学 大木 真人 本岡 毅 鈴木 新一 島田 政信

出版者

社団法人 日本リモートセンシング学会

雑誌

日本リモートセンシング学会誌 (ISSN:02897911)

巻号頁・発行日

vol.37, no.1, pp.1-12, 2017-01-31 (Released:2017-08-23)

参考文献数

20

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In this paper, we evaluate the potential accuracy for the volcanic ash coverage using interferometric coherence of the Phased Array type L-band Synthetic Aperture Radar-2 (PALSAR-2) aboard the Advanced Land Observing Satellite-2 (ALOS-2, “DAICHI-2”). In order to detect the disaster affected area from interferometric coherence, we require pre-disaster and co-disaster pairs. That is, we require at least two interferometric archives taken before the disaster in addition to one archive after the disaster. The ideal multi-temporal analysis is performed with of course, highest resolution pairs. However, we do not always have enough number of the archive especially in the early stage of the satellite mission. Here, we use not only Stripmap but also ScanSAR mode archive in order to achieve enough number of pairs. The combination of the Stripmap and ScanSAR archives will help to increase the interferometric pair while it suffers the spatial resolution and coherency. Especially for ALOS-2 PALSAR-2 data, it has not been evaluated the potential accuracy of such Stripmap-ScanSAR interferometry method. In this paper, we use the volcanic eruption event in May 2015 at Kuchinoerabu-jima Island, Kagoshima prefecture, Japan for the case study. We evaluated the proposed method with the truth data which was achieved by manual classification using aerial photography. Experimental results showed that the proposed method marked approximately 91% overall accuracy with 0.64 Kappa coefficients to detect the dense volcanic ash coverage.

著者

吉田 圭吾 高山 泰一 福原 弘太郎 内田 敦 関根 秀真 鹿志村 修

出版者

社団法人 日本リモートセンシング学会

雑誌

日本リモートセンシング学会誌 (ISSN:02897911)

巻号頁・発行日

vol.32, no.5, pp.287-299, 2012-11-20 (Released:2013-08-24)

参考文献数

53

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This paper presents a monitoring method for paddy fields with hyperspectral remote sensing images in West Java, Indonesia. The statistical modeling method called sparse reguralization is introduced in two forms, that is, LASSO regression for the rice yield estimation and sparse discriminant analysis for the growth stage classification of rice plants, in order to take advantages of the detailed reflectance spectrum measured by numerous bands and to overcome the difficulties in hyperspectral image analysis such as model overfitting. Results of the experiment with airborne hyperspectral images measured by HyMap indicate that sparse regularization can predict paddy conditions with higher degree of accuracy than several estimation methods commonly used in remote sensing applications, such as normalized difference spectral index, partial least squares, or support vector machines. Besides, the prediction models have a limited number of bands which are expected to be informative to figure out the rice growth situation. The overall error between predicted rice yield of the target area and agricultural statistics is 6.40 %, showing the potential effectiveness of methods described in this paper.

著者

古橋 大地

出版者

社団法人 日本リモートセンシング学会

雑誌

日本リモートセンシング学会誌 (ISSN:02897911)

巻号頁・発行日

vol.31, no.3, pp.376-377, 2011-07-30 (Released:2012-03-13)

被引用文献数

1

著者

伍 培明 川村 宏 木村 富士男

出版者

社団法人 日本リモートセンシング学会

雑誌

日本リモートセンシング学会誌 (ISSN:02897911)

巻号頁・発行日

vol.17, no.5, pp.518-523, 1997-12-30 (Released:2009-05-29)

参考文献数

3

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Winds are the critical factor in determining regional weather patterns and climate. In winter, the winds over the Sea of Japan have great effect on the weather of Japan islands. In this paper, wind distribution over the Sea of Japan is analyzed by using wind data observed by NASA Scatterometer (NSCAT) aboard Japan's Advanced Earth Observing Satellite (ADEOS, Midori).Synoptic views of the wind field over the Sea of Japan show remarkable evidence of a land topography effect causing a convergence of the surface wind field during cold-air outbreaks. The Changbai mountains in the North Korea locates at upstream of outbreak winds, and the wind field is deformed by them over the western part of the Sea of Japan. Strong north winds and northwesterly winds of about 15-20 m/s are observed off Vladivostok and off the Korea Peninsula, respectively, and they converge while blowing over the Sea of Japan. A wind shadow, where the wind speed is less than about 9 m/s, is seen in the downwind of the mountains, extending more than 200 km. Numerical experiments using a three-dimensional local circulation model were performed to investigate the formation mechanisms of the outbreak-wind deformation. The results show that the simulated winds agree well with the NSCAT observed winds.

著者

福島 圓

出版者

社団法人 日本リモートセンシング学会

雑誌

日本リモートセンシング学会誌 (ISSN:02897911)

巻号頁・発行日

vol.7, no.2, pp.123-134, 1987-06-30 (Released:2009-05-22)

参考文献数

26

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Development and research on Radio Acoustic Sounding System (RASS) are reviewed. RASS technique is used to remotely measure the atmosphereic temperature profiles. Principles of two methods of temperature mesurements, i.e., Doppler determination and Bragg resonance determination of temperature are outlined. Merit and demerit of both methods are discussed. The state of the art of development of RASS theories based on radio wave scattering by radio refractive-index inhomogeneities produced by an acoustic wave is reviewed in brief.