Christian N. Koyama

31 papers C 25Journal 6
YearRankTypeTitle / Venue / Authors
2023 C conf
Achievements of the ALOS-2 L-Band SAR Long-Term Pantropical Forest Monitoring Mission.
IGARSS
Christian N. Koyama, Masanobu Shimada, Kazufumi Kobayashi, Manabu Watanabe, Ake Rosenqvist, Masato Hayashi, Tsutomu Yamanokuchi, Takeo Tadono
2023 C conf
Next-Generation L-Band SAR Deforestation Detection for Operational Forest Early Warning in the Tropics.
IGARSS
Christian N. Koyama, Masanobu Shimada, Kazufumi Kobayashi, Masato Hayashi, Takeo Tadono
2022 C conf
Advancements in Global Forest Monitoring Research Founded on ALOS-2 Long-Term Pantropical Land Observation.
IGARSS
Christian N. Koyama, Manabu Watanabe, Masato Hayashi, Masanobu Shimada, Kazufumi Kobayashi, Takeo Tadono
2021 J jnl
Comparative Analysis of the Global Forest/Non-Forest Maps Derived from SAR and Optical Sensors. Case Studies from Brazilian Amazon and Cerrado Biomes.
Remote. Sens.
Edson Eyji Sano, Paola Rizzoli, Christian N. Koyama, Manabu Watanabe, Marcos Adami, Yosio Edemir Shimabukuro, Gustavo Bayma, Daniel M. Freitas
2021 C conf
Improving L-Band SAR Forest Monitoring by Big Data Deep Learning Based on ALOS-2 5 Years Pan-Tropical Observations.
IGARSS
Christian N. Koyama, Manabu Watanabe, Edson Eyji Sano, Masato Hayashi, Izumi Nagatani, Takeo Tadono, Masanobu Shimada
2021 C conf
Trial of Detection Accuracies Improvement for JJ-FAST Deforestation Detection Algorithm Using Deep Learning.
IGARSS
Manabu Watanabe, Christian N. Koyama, Masato Hayashi, Izumi Nagatani, Takeo Tadono, Masanobu Shimada
2020 C conf
Rainfall-Induced Changes in L-Band Backscatter Over Tropical Forests and Their Impact on Deforestation Monitoring.
IGARSS
Christian N. Koyama, Manabu Watanabe, Masato Hayashi, Izumi Nagatani, Takeo Tadono, Masanobu Shimada
2020 C conf
Seasonal Change Analysis for ALOS-2 PALSAR-2 Deforestation Detection.
IGARSS
Izumi Nagatani, Masato Hayashi, Manabu Watanabe, Takeo Tadono, Tomohiro Watanabe, Christian N. Koyama, Masanobu Shimada
2020 C conf
Trial of Deforestation Detection by Using 25M Resolution PALSAR-2/ScanSAR Data.
IGARSS
Manabu Watanabe, Christian N. Koyama, Masato Hayashi, Izumi Nagatani, Takeo Tadono, Masanobu Shimada
2019 C conf
Advanced Polarimetric Stereo-Sar for Tsunami Debris Estimation and Disaster Mitigation.
IGARSS
Christian N. Koyama, Shunichi Koshimura, Motoyuki Sato
2019 C conf
Improvement of Deforestation Detection Algorithms Used In JJ-FAST.
IGARSS
Manabu Watanabe, Christian N. Koyama, Masato Hayashi, Izumi Nagatani, Takeo Tadono, Masanobu Shimada
2019 C conf
Mapping Spatial-Temporal Forest Heterogeneity in the Tropical Belt by ALOS-2/PALSAR-2 Big Data Analysis.
IGARSS
Christian N. Koyama, Manabu Watanabe, Masanobu Shimada
2019 C conf
Pixel-Based Deforestation Detection Algorithm for ALOS-2/PALSAR-2.
IGARSS
Izumi Nagatani, Masato Hayashi, Manabu Watanabe, Takeo Tadono, Tomohiro Watanabe, Christian N. Koyama, Masanobu Shimada
2018 J jnl
Calibration Method for Multi Static Linear Array Radar with One Dimensional Array Antenna Arranged in Staggered Manner.
IEICE Trans. Electron.
Yasunari Mori, Takayoshi Yumii, Yumi Asano, Kyouji Doi, Christian N. Koyama, Yasushi Iitsuka, Kazunori Takahashi, Motoyuki Sato
2018 J jnl
Early-Stage Deforestation Detection in the Tropics With L-band SAR.
IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens.
Manabu Watanabe, Christian N. Koyama, Masato Hayashi, Izumi Nagatani, Masanobu Shimada
2018 C conf
Forest Early Warning System Using ALOS-2/PALSAR-2 Scansar Data (JJ-FAST).
IGARSS
Izumi Nagatani, Masato Hayashi, Manabu Watanabe, Takeo Tadano, Tomohiro Watanabe, Christian N. Koyama, Masanobu Shimada
2018 C conf
Monitoring of Soil Moisture Dynamics in the Semi-Arid Tropics by Means of ALOS-2/PALSAR-2 Dual-Polarization ScanSAR Data.
IGARSS
Christian N. Koyama, Manabu Watanabe, Masanobu Shimada
2018 C conf
Semi-Automatic Deforestation Detection Algorithm with PALSAR-2/ScanSAR HH/HV Polarizations.
IGARSS
Manabu Watanabe, Christian N. Koyama, Masato Hayashi, Izumi Nagatani, Takeo Tadono, Masanobu Shimada
2017 J jnl
Development of Multistatic Linear Array Radar at 10-20GHz.
IEICE Trans. Electron.
Yasunari Mori, Takayoshi Yumii, Yumi Asano, Kyouji Doi, Christian N. Koyama, Yasushi Iitsuka, Kazunori Takahashi, Motoyuki Sato
2017 C conf
Development of early-stage deforestation detection algorithm (advanced) with PALSAR-2/ScanSAR for JICA-JAXA program (JJ-FAST).
IGARSS
Manabu Watanabe, Christian N. Koyama, Masato Hayashi, Yutaka Kaneko, Masanobu Shimada
2017 J jnl
In-Situ Measurement of Soil Permittivity at Various Depths for the Calibration and Validation of Low-Frequency SAR Soil Moisture Models by Using GPR.
Remote. Sens.
Christian N. Koyama, Hai Liu, Kazunori Takahashi, Masanobu Shimada, Manabu Watanabe, Tseedulam Khuut, Motoyuki Sato
2017 C conf
Polarimetric characteristics of L-band SAR images of early-stage deforestation areas.
IGARSS
Manabu Watanabe, Christian N. Koyama, Masanobu Shimada
2017 C conf
The effect of precipitation and soil moisture variations on (partial) polarimetric L-band SAR backscatter in tropical forest regions.
IGARSS
Christian N. Koyama, Manabu Watanabe, Masato Hayashi, Masanobu Shimada
2016 J jnl
Post-Earthquake Damage Inspection of Wood-Frame Buildings by a Polarimetric GB-SAR System.
Remote. Sens.
Hai Liu, Christian N. Koyama, Jinfeng Zhu, Qing Huo Liu, Motoyuki Sato
2015 C conf
Development of a biomass corrected soil moisture retrieval model for dual-polarization ALOS-2 data based on ALOS/PALSAR and PI-SAR-L2 observations.
IGARSS
Christian N. Koyama, Karl Schneider, Motoyuki Sato
2015 C conf
Full polarimetric UWB GB-SAR for damage assessment of wooden building structures.
IGARSS
Christian N. Koyama, Yasushi Iitsuka, Kazunori Takahashi, Motoyuki Sato
2015 C conf
Urban damage mapping using scattering mechanism investigation technique for fully polarimetric SAR data.
IGARSS
Si-Wei Chen, Yongzhen Li, Xuesong Wang, Christian N. Koyama, Motoyuki Sato
2014 C conf
Estimation of soil moisture and debris pile volume from Pi-SAR2X and Pi-SAR-L2 square-flight data.
IGARSS
Christian N. Koyama, Motoyuki Sato
2014 C conf
Investigation on near range SAR for inspecting inner structure of buildings.
IGARSS
Motoyuki Sato, Kazunori Takahashi, Hai Liu, Christian N. Koyama
2012 C conf
Vegetation effects on L-band soil moisture retrieval - Lessons learned from 5 years of ALOS PALSAR observations.
IGARSS
Christian N. Koyama, Karl Schneider
2011 C conf
Soil moisture retrieval under vegetation using dual polarized PALSAR data.
IGARSS
Christian N. Koyama, Karl Schneider