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Nishi-Tokyo-shi, Japan

Ishitsuka N.,Japan National Institute for Agro - Environmental Sciences | Tomiyama N.,RESTEC | Makino T.,Hokkaido Research Organization
ACRS 2015 - 36th Asian Conference on Remote Sensing: Fostering Resilient Growth in Asia, Proceedings

We report results that identification of dent corn using L-band synthetic aperture radar. We carried out study in Nakashibetsu, Hokkaido, Japan. The study area is one of most popular daily farming area in Japan. However the area is cool in summer season. Therefor it is not suitable for corn growth very much. On the other hand, the corn price in the world remains high level. The daily farmers in Nakashibetsu make effort production of dent corn themselves. Therefor we are studying identification of dent corn and trying grasp of production using L-band SAR. We used Pi-SAR-L2 (L-band Air craft SAR sensor developed by JAXA) data that observed in 2013 and 2014 at Nakashibetsu. The observation carried out same orbit angle ALOS-2. As results, the accuracy of identification marked high precision stably more than 90%. On the other hand results different each appeared by 2-year experiment although there was the polarization that linear relation was seen in about the yield. In this year, we are studying using ALOS-2/PALSAR-2. Source

Ishitsuka N.,Japan National Institute for Agro - Environmental Sciences | Tomiyama N.,RESTEC | Yamanokuchi T.,RESTEC | Saito G.,Japan Aerospace Exploration Agency | And 2 more authors.
2011 3rd International Asia-Pacific Conference on Synthetic Aperture Radar, APSAR 2011

The agricultural statistical section of Japanese government starts the project for development of application using satellite image to measure paddy rice planted area in Japan from 2009. While clouds block optical sensor observations, measurement method using SAR should be developed. The project carried out selected 8 cities in 2009. This paper reports results of ALOS/PALSAR data. The average accuracy of detection of paddy rice planted fields was about 70%. It is considered that spatial resolution of ALOS/PALSAR is not enough Japanese paddy fields. Therefore we expect ALOS-2 sensor. © 2011 KIEES. Source

Furuta R.,RESTEC | Tomiyama N.,RESTEC
34th International Symposium on Remote Sensing of Environment - The GEOSS Era: Towards Operational Environmental Monitoring

On October 29, 2008, magnitude 6.4 earthquake occurred in a area of western Pakistan. One of the Japanese earth observation satellite, Advanced Land Observing Satellite (ALOS), observed this area by all onboard sensors, AVNIR-2, PRISM, and PALSAR. By optical imagery, AVNIR-2 and PRISM imagery, huge landslide (rock slide) and landslide dam were confirmed by visual interpretation. And also this landslide can be confirmed by PALSAR imagery. Using optical imagery and PALSAR data, the amount of deformation of landslide was analyzed. Especially, PALSAR DInSAR analysis performed well to detect landslide movement that cannot detect by optical imagery. However, some landslides was not detected clearly by PALSAR DInSAR analysis. Through these analyses, the applicability of ALOS data for landslide detection is discussed in this paper. And using both optical imagery and PALSAR DInSAR imagery, landslide disasters of the 2008 Pakistan earthquake is evaluated. Source

Rosenqvist A.,SoloEO Japan | Shimada M.,Japan Aerospace Exploration Agency | Suzuki S.,Japan Aerospace Exploration Agency | Ohgushi F.,Japan Aerospace Exploration Agency | And 6 more authors.
Remote Sensing of Environment

With the launch of the Advanced Land Observing Satellite (ALOS) in 2006, the Japanese Space Agency (JAXA) took the initiative to implement the first global-scale systematic acquisition strategy for satellite sensors at fine and medium (2.5-20. m) spatial resolution. Comprising all three sensors on ALOS (PALSAR, PRISM, AVNIR-2), the plan was designed to serve all ALOS user categories and aimed at producing spatially and temporally consistent baseline coverages over the planet on a repetitive basis, to accommodate systematic global-scale, fine-resolution, monitoring of the environment. Unlike the common background missions defined for most fine-resolution Earth Observation satellites, the observation strategy was implemented as a top-level foreground mission with a priority second only to that of special observation requests and emergency observations and sensor calibration.While the ALOS mission regrettably ended in April 2011, the global acquisition strategy nevertheless produced a comprehensive and homogeneous global archive in which consistent time-series of data are available for any arbitrary land area on Earth (excluding Antarctica >. 77.5° South latitude, which could not be reached by the sensors). Clouds and haze inevitably constituted limitations for the optical sensors, while for the PALSAR instrument, two cloud-free and near-gap free (~. 95%) global coverages were achieved annually during the 4.5. years in operations. Previously, such uniform data archives existed only for coarse-resolution sensors such as AVHRR, MERIS and MODIS. The ALOS BOS supported a variety applications from local to global scales, ranging from structural deformation, monitoring of wetlands regional inundation patterns and mapping of forest extent and changes over nations and continents at spatial resolutions as fine as 10. m.The Advanced Land Observing Satellite 2 (ALOS-2) was launched on May 24, 2014. Equipped with an enhanced L-band SAR sensor (PALSAR-2), ALOS-2 resumes the global wall-to-wall acquisitions to assure continuity and consistency with JAXA's global mission objectives and unique L-band SAR archive created by ALOS PALSAR. © 2014 Elsevier Inc. Source

Rodriguez J.A.P.,Planetary Science Institute | Tanaka K.L.,U.S. Geological Survey | Yamamoto A.,RESTEC | Berman D.C.,Planetary Science Institute | And 5 more authors.

Wind streaks comprise recent aeolian deposits that have been extensively documented on Venus, Earth and Mars. Martian wind streaks are among the most abundant surface features on the planet and commonly extend from the downwind margins of impact craters. Previous studies of wind streaks emerging from crater interior deposits suggested that the mode of emplacement was primarily related to the deposition of silt-sized particles as these settled from plumes. We have performed geologic investigations of two wind streaks clusters; one situated in western Arabia Terra, a region in the northern hemisphere of Mars, and another in an analogous terrestrial site located in southern Patagonia, Argentina, where occurrences of wind streaks emanate from playas within maar craters. In both these regions we have identified bedforms in sedimentary deposits on crater floors, along wind-facing interior crater margins, and along wind streaks. These observations indicate that these deposits contain sand-sized particles and that sediment migration has occurred via saltation from crater interior deposits to wind streaks. In Arabia Terra and in Patagonia wind streaks initiate from crater floors that contain lithic and evaporitic sedimentary deposits, suggesting that the composition of wind streak source materials has played an important role in development. Spatial and topographic analyses suggest that regional clustering of wind streaks in the studied regions directly correlates to the areal density of craters with interior deposits, the degree of proximity of these deposits, and the craters' rim-to-floor depths. In addition, some (but not all) wind streaks within the studied clusters have propagated at comparable yearly (Earth years) rates. Extensive saltation is inferred to have been involved in its propagation based on the studied terrestrial wind streak that shows ripples and dunes on its surface and the Martian counterpart changes orientation toward the downslope direction where it extends into an impact crater. © 2009 Elsevier B.V. Source

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