Takeo Tadono

Geometric performance of the small satellite CE-SAT-IE carrying an optical sensor derived from the COTS camera Canon EOS R5

Junichi Takaku, Takeo Tadono, Sota Hirayama, Yuki Asahi et autres

Abstract. The CE-SAT-IE is a small optical satellite developed by Canon Electronics Inc. (CE). It is equipped with an optical frame sensor derived from a commercial off-the-shelf (COTS) camera, the Canon EOS R5, which observes ground images from an altitude of 670 …

Global Mangrove Watch: Timeseries of Mangrove Extent

Pete Bunting, Lammert Hilarides, Ake Rosenqvist, Gregory Oakes et autres

The Global Mangrove Watch (GMW; https://www.globalmangrovewatch.org) v4.1 timeseries layers were generated using the full Landsat and Sentinel-2 timeseries and available JAXA L-band data (JERS-1, ALOS PALSAR, ALOS-2 PALSAR-2). The methodology is built on knowledge gained from developing the previous GMW layers (GMW …

nl, gb, be, jp (code pays fourni par la source)

Global Mangrove Watch: Timeseries of Mangrove Extent

Pete Bunting, Lammert Hilarides, Ake Rosenqvist, Gregory Oakes et autres

The Global Mangrove Watch (GMW; https://www.globalmangrovewatch.org) v4.1 timeseries layers were generated using the full Landsat and Sentinel-2 timeseries and available JAXA L-band data (JERS-1, ALOS PALSAR, ALOS-2 PALSAR-2). The methodology is built on knowledge gained from developing the previous GMW layers (GMW …

nl, gb, be, jp (code pays fourni par la source)

Observation and Coordination Needs for Current, Near‐Future, and Next Generation Earth‐Observing SAR Systems

Cathleen E. Jones, Åke Rosenqvist, Björn Rommen, Magdalena Fitrzyk et autres

Abstract This paper summarizes an evaluation by experts of how coordination of Earth‐observing Synthetic Aperture Radar (SAR) missions among the world's space agencies could advance toward game‐changing scientific discoveries and fully realizing SAR's practical capability to address many issues facing society. We …

us, no, jp, nl, it, gb, ch, ca, ar, at (code pays fourni par la source)

Europe-wide maps of biomass density based on satellite remote sensing data for 2017, 2020, 2021 and 2023

Santoro Maurizio, Oliver Cartus, Arnan B. Araza, Martin Herold et autres

Spatially explicit information on forest structure and biomass is needed to meet the monitoring and reporting requirements of several European policies. Satellite images enable mapping and monitoring of the Europe’s forest resources through operational observations from the Sentinel-1 Synthetic Aperture Radar (SAR) …

ch, de, nl, fi, jp, it (code pays fourni par la source)

Fourier Neural Operator Approach for Ionospheric Phase Compensation in L-Band SAR Interferometry

Kazuki Yanagiya, Yutaro Shigemitsu, Takeshi Motohka, Takeo Tadono

The ionosphere introduces path delay phases into Interferometric Synthetic Aperture Radar (InSAR) images, degrading the accuracy of ground deformation measurements particularly for long-wavelength L-band systems. Analytical split-spectrum estimation can become unstable in non-ideal cases due to decorrelated sub-band interferograms, phase-unwrapping errors, and …

jp (code pays fourni par la source)

Influence of GW Filter Parameters on the Accuracy of Landslide Displacement Measurements by SAR Interferograms : A Comparative Study with GNSS Positionings around Kounai Area, Sobetsu Town, Hokkaido

Seiya USAMI, Takeo Tadono, Satoshi Ishimaru

InSARによる地すべり変位量の計測では, 位相ノイズを低減するGWフィルタが活用されている。本研究では, GWフィルタのパラメータ設定とSAR干渉画像の計測精度との関係を, GNSS測位との突合に基づいて検討した。その結果, 移動窓の大きさと指数の両方のパラメータを適切に設定しないと地すべり変位量を過小評価してしまうこと, GWフィルタを改修したBaranフィルタを用いることで, パラメータを移動窓の大きさだけに削減できることを実証的に示した。これらの結果は, 位相ノイズ低減におけるフィルタパラメータ最適化の重要性を指摘している。

jp (code pays fourni par la source)

Fostering tropical cyclone research and applications with Synthetic Aperture Radar

Alexis Aurelien Mouche, Arthur Avenas, Paul C. Chang, Bertrand Chapron et autres

We examine how, over its first decade, the Sentinel-1 mission has advanced the estimation of ocean surface winds over tropical cyclones, supported their global monitoring, and fostered related research. C-band S1 Synthetic Aperture Radar have been instrumental in refining wind retrieval algorithms, …

The First National-Scale High-Resolution Land Use Land Cover Map of Bangladesh Using Multi-Temporal Optical and SAR Imagery

Md. Manik Sarker, Dibakar Chakraborty, Van Thinh Truong, Yasuhiro Mizuno et autres

Bangladesh is highly susceptible to land use land cover (LULC) changes due to its geographical location and dense population. These changes have significant effects on food security, urban development, and natural resource management. Policy planning and resource management largely depend on accurate …

jp, in, au, bd (code pays fourni par la source)

Post-launch operational results and current status of ALOS-4

Keisho Ito, Yukihiro Kankaku, Takeshi Motohka, Takeo Tadono et autres

The Advanced Land Observing Satellite-4 (ALOS-4) was launched on July 1, 2024. It is the latest satellite in the ALOS series, a line of earth surface observation satellites developed by the Japan Aerospace Exploration Agency (JAXA). ALOS-4 carries two key instruments: Phased …

jp (code pays fourni par la source)

Monitoring Biodiversity and Ecosystem Services Using L-Band Synthetic Aperture Radar Satellite Data

Brian Alan Johnson, Chisa Umemiya, Koji Miwa, Takeo Tadono et autres

Over the last decade, L-band synthetic aperture radar (SAR) satellite data has become more widely available globally, providing new opportunities for biodiversity and ecosystem services (BES) monitoring. To better understand these opportunities, we conducted a systematic scoping review of articles that utilized …

jp (code pays fourni par la source)

ALOS-2/-4 Operational Deforestation Detection and Early Warning Japan's L-band SAR Contribution to Global Forest Sustainabilty

Christian N. Koyama, 島田 政信, Yukihiro Kankaku, Kazufumi Kobayashi et autres

This paper discusses recent advances in operational deforestation monitoring over the Amazon using ALOS-2/-4 data. While the current JJ-FAST Ver. 4.1 achieves highly satisfactory reliability under most seasonal conditions, there are still some problem cases to consider, especially in areas with large-scale …

jp, br (code pays fourni par la source)