著者

高橋 徹 臼井 敏夫 藤島 豊久 大木 真人 佐野 博昭 小定 弘和

出版者

The Remote Sensing Society of Japan

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.360-366, 2016-09-20 (Released:2017-03-24)

参考文献数

10

被引用文献数

2

---

The L-band synthetic aperture radar (SAR) satellite, ALOS-2 (Daichi-2), has a capability for educational purposes. The radar aboard ALOS-2, named PALSAR-2, has a wavelength of 24 cm, compatible with a makeable reflector size for children. In addition, as the spatial resolution of the radar is approximately 3 m, children can easily draw a letter in the radar image by deploying their own reflectors in the schoolyard. We have developed a sufficiently reflective corner reflector (CR) that can be easily built by children. In experiments, we clarified that ALOS-2 can detect reflected waves from a CR with a side length of three times the radar wavelength. We also developed free software that enables children and their educators to analyze most earth observation satellite data including ALOS-2 PALSAR-2 data. In 2014, we established an educational program called “Let's expose ourselves on Daichi-2 data” with the YAC-J (Young Astronauts Club Japan) and EORC (Earth Observation Research Center), JAXA. We have also held seminars for educators in various places in Japan. As a result, more than 20 groups have implemented the program. We conclude that this program enables children and their educators to feel a connection to space and fosters their interest in their native environments.

著者

大内 和夫

出版者

The Remote Sensing Society of Japan

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.5, pp.577-583, 2016-11-28 (Released:2017-05-26)

参考文献数

43

著者

細谷 和範 菊川 浩行

出版者

The Remote Sensing Society of Japan

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.25, no.5, pp.443-458, 2005-11-15 (Released:2009-05-22)

参考文献数

9

被引用文献数

1

---

The intermittent warm ocean water intrusion into Kagoshima bay is well known as Kyucho phenomenon. We first visualize these phenomena in winter using the satellite thermal infrared images and examine some specifications, especially the distribution patterns, of the intrusion. Then the numerical analysis using a multi-leveled finite difference method is performed for the purpose to investigate the phenomena. It is found from the numerical analysis : (1) The intrusion occurs when the warm water comes into touch with the bay water at the mouth of the bay. (2) The calculated velocity of the warm water intrusion is the same order to the ones estimated by the satellite images. (3) The role of the initial velocity is to increase the intrusion speed. (4) The intrusion speed also increases with the temperature and the thickness of the ocean water. (5) The sea surface wind changes the warm water distribution pattern in the bay. The effects of the warm water contact period at the mouth of the bay and the two successive intrusions are also investigated.

著者

真鍋 淑郎

出版者

The Remote Sensing Society of Japan

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.21, no.4, pp.366-372, 2001-09-28 (Released:2009-05-22)

参考文献数

10

被引用文献数

1

---

大気・海洋結合モデルの数値実験によると,21世紀末ころには地表の全球平均気温は現在より2~3℃程度上がる。昇温は,陸面で更に大きくなると予測される。また,半乾燥地帯の土壌水分が減少し,砂漠が拡張しそうである。二酸化炭素などを規制せずに放出し続ければ,数百年先に大気の二酸化炭素濃度が,今の4倍位になり,非常に大きな気候の変化がおこる可能性が大きい。これからは,温暖化に伴う全球的変化の検出,放射強制力を持っ温室効果ガス,エアロゾル等の分布決定,モデルに組み込まれた色々な素過程の検証等にRemote Sensingが増々重要になるであろう。

著者

富谷 光良 石黒 洋行 中島 康裕 豊田 弘道

出版者

The Remote Sensing Society of Japan

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.15, no.3, pp.232-241, 1995-06-30 (Released:2009-05-22)

参考文献数

9

---

The computer graphical method for analysis of remote sensing multi-spectral image data is proposed. Three-dimensional histogram is constructed in three-dimensional feature space from the image data and represented by three-dimensional computer graphics. On the histogram fine structure of distribution of data in the feature space can be observed. Therefore the categories of remote sensing multi-spectral image data can be identified easily on the computer screen. Each distribution of water, vegetation and soil etc. has its charasteristic features in the histogram. One of the most distinguished features is that distribution of data of each category is long and narrow, and the principle component axes of the categories concentrate on a point near the origin of the feature space.

著者

小林 秀樹 松永 恒雄 梅干 野晁

出版者

The Remote Sensing Society of Japan

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.22, no.5, pp.612-624, 2002-12-31 (Released:2009-05-22)

参考文献数

31

被引用文献数

2

---

本研究では,まずTOMS/PAR法の基礎検討により,Ruvに対するRsの影響と,標高の変化に伴うPARclearの変化が無視できないことを指摘し,改良TOMS/PAR法を提案した。また,TOMS/PAR法と改良TOMS/PAR法でのPAR推定精度の違いを気象庁の観測値を用いて検証し,後者の場合,より妥当なPAR推定値が得られる事が確認できた。さらにMODISのFPARプロダクトとTOMS/PAR法及び改良TOMS/PAR法によるPAR推定値を用いてAPARを算出し,APAR推定誤差がNPP推定誤差に与える影響を評価した。その結果,ランダム誤差は最大で年間NPPの4%程度,バイアス誤差が4-6%(MODIS/FPAR+改良TOMS/PAR法),8-9%(MODIS/FPAR+TOMS/PAR法)であった。これらの検討から,TOMS/PAR法,改良TOMS/PAR法ともに,既往研究における年間NPPのモデル間のCVよりは小さく,現在のAPAR推定値は全球NPP推定値の算出に対して十分な精度を持っていることが示された。しかし,年間NPPの全球推定にあたって,不確実性を低減させるためには,様々な地表面の紫外線反射率の影響を受けにくい改良TOMS/PAR法を用いた方がより信頼できる値を得られる。

著者

田中 修三

出版者

The Remote Sensing Society of Japan

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.12, no.2, pp.157-167, 1992-06-30 (Released:2009-05-22)

参考文献数

9

---

What is the horseshoe-shaped topographies in Kawashima-cho Hiki-gun seen on Landsat image? That is the origin of this study. This study is a good example that satellite remote sensing technoligy could have a potential to survey the large scale ruins of ancient river channel.This report describes the formation and valuation of the geographical characteristics in Kawashima-cho Saitama which are investigated by image analysis, surveying the literature, principal component analysis and numerical simulation of overland flood model.The results of this study are summarized as fol-lows :1) The horeseshoe-shaped topographies are natural embankment which closely relate to the Arak-awa river channel of ancient times. In the present, these are used for road, field and residential area.2) Principal component analysis using material datum of rainfall on and affter Meiji period indicate that amount of rainfall in upper stream from Yorii of The Arakawa river control the amount of flood damage in Kawashima-cho. Consequently, a. change of the Arakawa river channel in period Edo guided the amount of rainfall which determined flooded area and brought increasing of flood damage in Kawashima-cho. So it is necessary to give careful consideration to the design of improvement for river channel.3) The result of numerical simulation of overland flood flow shows the horseshoe-shaped topographies work as embankmet against flood flow and lighten the flood damage. The natural embankmeent in seen on Landsat image defended residential and farm area against the overland flood flow of small scale.

著者

田中 總太郎 杉村 俊郎 原田 知幸 田中 美枝子

出版者

The Remote Sensing Society of Japan

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.11, no.3, pp.529-537, 1991-09-30 (Released:2009-05-22)

参考文献数

8

著者

富谷 光良 石黒 洋行 中島 康裕 山口 基貴 豊田 弘道

出版者

The Remote Sensing Society of Japan

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.15, no.4, pp.326-337, 1995-09-30 (Released:2009-05-22)

参考文献数

8

---

The linear algebraic analysis of remotely sensed multispectral image is studied. The inner product is applied to the classification and the outer product to systematic treatment of mixels. The analysis uses essentially angular distribution of data with respect to the origin of feature space. The offsets which are involved in the data are estimated by the 3-dimensional histogram and subtracted from the data. Then the fact that pixels have the same angle in the feature space strongly implies that they have the same reflectances and belong to the same category. Therefore the angles of data is the most important information to classify the categories.

著者

祖父江 真一 荒木 博志 田澤 誠一 野田 寛大 奥村 隼人 東泉 一郎 島田 卓也 比嘉 聡 小林 江里子

出版者

The Remote Sensing Society of Japan

雑誌

日本リモートセンシング学会誌 = Journal of the Remote Sensing Society of Japan (ISSN:02897911)

巻号頁・発行日

vol.28, no.3, pp.274-277, 2008-06-25

著者

虎谷 充浩

出版者

The Remote Sensing Society of Japan

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.33, no.1, pp.56-58, 2013-01-30 (Released:2013-08-24)

参考文献数

2

著者

本多 嘉明 梶原 康司

出版者

The Remote Sensing Society of Japan

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.2, pp.101-104, 2012-04-20 (Released:2012-11-01)

参考文献数

8

被引用文献数

2

著者

安在 亮 富谷 光良

出版者

The Remote Sensing Society of Japan

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.21, no.3, pp.232-239, 2001-06-29 (Released:2009-05-22)

参考文献数

9

---

Image-to-image registration is applied to register overlapped images of a scene from different dates and views. Area features of the same regions are extracted from images as matching entities.The boundaries are matched in the frequency domain (Fourier descriptors) as area features. Two applications to extract the features from images as matching entities, "Edge enhancement and thinning" and "Region growing" are examined for this method. Registering a pair ofremote sensing data using this method is presented to show the secular change and the seasonal change of the data.

著者

Takeshi HOSHIKAWA Kazukiyo YAMAMOTO

出版者

The Remote Sensing Society of Japan

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.40, no.1, pp.13-19, 2020-01-31 (Released:2020-07-07)

参考文献数

28

---

Pine wilt disease is one of the most destructive disease of pine forests. It is important to detect and exterminate infected trees for preservation of the forest. We demonstrated a novel method combining individual tree detection (ITD) and classification by logistic regression using unmanned aerial vehicle (UAV) images for the mapping of infected trees. In the ITD phase, 50 % and 84 % of damaged trees were automatically detected from the 3D point cloud generated from the UAV images using the local maximum filter. These rates of detection were comparable to previous studies that used UAV imagery. Subsequently, five vegetation indices calculated from multispectral and visible color (RGB) images were used. Among the vegetation indices, normalized difference vegetation index (NDVI), normalized difference red edge index (NDRE), and vegetation atmospherically resistant index (VARI) were preferable explanatory variable in the logistic regression to divide damaged and undamaged trees. The accuracy of these models ranged from 98 % to 100 % and the F-measure ranged from 94 % to 100 %. The best model, the logistic regression model using VARI as the explanatory variable, was then tested using five datasets to evaluate general performance. Each model showed explicitly high accuracy ranging from 95 % to 100 %. The best accuracy when considering the ITD and classification was 84 %. To map pine wilt disease, the proposed method is suitable for practical use due to its high-efficient and low-cost.

著者

Kaho NITTA Prakhar MISRA Sachiko HAYASHIDA

出版者

The Remote Sensing Society of Japan

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.42, no.1, pp.36-50, 2022-02-10 (Released:2022-04-26)

参考文献数

36

---

In this study, the advantage of the state-of-the-art sensor TROPOspheric Monitoring Instrument (TROPOMI) for air pollution research in Indian subcontinent is examined by comparing it with the conventional sensor Ozone Monitoring Instrument (OMI), which has been utilized for more than 15 years since its launch in 2004. The OMI nitrogen dioxide (NO2) dataset was used for comparison, namely, version 4.0 of the standard product developed by NASA (named OMNO2). As our focus is the application of satellite sensors to the study of air pollution, only the areas with high NO2 concentration were extracted for the analysis. A one-year comparison between July 2018 and June 2019 showed strong positive correlation between TROPOMI and the OMI product, with Pearson correlation coefficient of 0.76. The difference between OMI and TROPOMI was generally random. Compared with OMNO2 version 4.0, the annually averaged difference of TROPOMI was found to be (−0.8±1.1)×1015 (1σ) molecules cm−2, which is −22 %±24 % (1σ) as a relative value. The good agreement between TROPOMI and OMI confirmed the compatibility of the observed values. The high resolution of TROPOMI enables the observation of small-scale sources of NO2 that cannot be detected by OMI, which allowed the identification of some examples of NO2 hotspots over power plants in India. The recent identification of a rapid decrease in NO2 after the COVID-19 lockdown in March 2020 in India using TROPOMI data demonstrates the potential of this sensor to detect rapid changes in anthropogenic activities. Our analysis demonstrates usefulness of the NO2 data from TROPOMI, and fruitful scientific results are expected in the future.

著者

佐々木 政幸 操野 年之

出版者

The Remote Sensing Society of Japan

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.2, pp.255-257, 2011-04-30 (Released:2012-03-13)

参考文献数

1

被引用文献数

2

著者

平田 更一

出版者

The Remote Sensing Society of Japan

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.23, no.2, pp.164-169, 2003-06-25 (Released:2009-05-22)

参考文献数

8

著者

竹内 延夫

出版者

The Remote Sensing Society of Japan

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.2, no.1, pp.3-20, 1982-03-05 (Released:2009-05-22)

参考文献数

68

被引用文献数

2

---

Laser radar (lidar) is an excellent remote monitoring method for obtaining spatial resolved information of the atmosphere. This paper consists of the followings : 1) an outline of the principle in laser radar measurement and types of laser radars, 2) laser radar systems, and 3) measurements of typical phenomena in air pollution and air-pollution related meteorology, using three laser radar systems (a mobile Mie-scattering laser radar, a large laser radar and a differential absorption lidar (DIAL)) at National Institute for Environmental Studies. Described phenomena cover aerosol dispersion of a stack plume, NO2, concentration distribution in a plume, temporal and spatial structures of atmospheric boundary layer using an aerosol distribution as an indicator, and wide-area pollution map. In addition, data processing of image data of wide-area pollution is described.by Nobuo Takeuchi

著者

青山 定敬 西川 肇 村井 宏

出版者

The Remote Sensing Society of Japan

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.10, no.4, pp.539-551, 1990-12-30 (Released:2009-05-22)

参考文献数

18

---

It is very important to obtain the information on soil physical properties and the growth condition of trees, when we make runoff analysis in forest land. But actual vegetation map is not including the growth condition of trees, and it is difficult to obtain the information on the soil. Therefore, it is thought that the usefulness of satellite data have to be verified in this aspect.This paper aims at estimating the ratio of coarse pore, which relates to hydrologic cycle in forest using satellite data and applying it to flood-runoff analysis. In mountainous terrain, it is necessary to eliminate the terrain effect to radiometrical distortion for satellite data. Therefore, the radiometrical distortions of used LANDSAT/TM data were eliminated using digital terrain model (DTM). Many measurement points were selected in the area for survey of various physical soil properties and vegetation conditions of the forest.In order to estimate the ratio of coarse pore from satellite data, we made linear multiple regression equation through multiple regression analyses on the relationship between the ratio of coarse pore and corrected LANDSAT/TM data to each of categorized three forest types. As the result, it was found that the ratio of coarse pore related to the band ratio of near-infrared/red. Further, we tried to apply the estimated ratio of coarse pore to runoff simulation model. It was found that this method was useful to estimate the ratio of coarse pore, because of the simulated hydrograph well coincide with the observed one.

著者

山本 晴彦 鈴木 義則 早川 誠而

出版者

The Remote Sensing Society of Japan

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.15, no.5, pp.463-470, 1995-12-30 (Released:2009-05-22)

参考文献数

23

---

The changes in spectral reflectance of plant leaves due to overlapping, leaf thickness, content of chlorophyll and content of water in leaf were investigated using spectrophotometer with integrating sphere. As experimental plants, we selected soybean (c.v. Fukuyutaka), sweet potato (c.v. Benikomachi) and mulberry (c.v. Tokiyutaka), which were main upland cultivar in Japan.1) Spectral reflectance of leaf surface in near infrared range increased in ASLW (accumulated of specific leaf weight, g/cm2). In visible range, even if ASLW increased, spectral reflectance of leaf surface not increased.2) In near infrared range, spectral reflectance of leaf surface linearly increased with increasing SLW (specific leaf weight, g/cm2) in the range of 0-0.05 g/cm2, which showed leaf thickness. For soybean leaves, the equation was "Reflectance in near infrared range (800-1100 nm, %)=2010× SLW+47.2", where correlation coefficient (r) was 0.905. The correlation coefficient value was 0.514 for sweet potato and 0.806 for mulberry respectively.3) Spectral reflectance of leaf surface from visible range to near infrared range increased with decreasing the leaf water content.