Christian N. Koyama

Publication Activity (10 Years)

Years Active: 2011-2023
Publications (10 Years): 27

Top Topics

Jet Propulsion Laboratory

Top Venues

IEICE Trans. Electron.

IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens.

Publications

Christian N. Koyama, Masanobu Shimada, Kazufumi Kobayashi, Masato Hayashi, Takeo Tadono
Next-Generation L-Band SAR Deforestation Detection for Operational Forest Early Warning in the Tropics. IGARSS (2023)
Christian N. Koyama, Masanobu Shimada, Kazufumi Kobayashi, Manabu Watanabe, Ake Rosenqvist, Masato Hayashi, Tsutomu Yamanokuchi, Takeo Tadono
Achievements of the ALOS-2 L-Band SAR Long-Term Pantropical Forest Monitoring Mission. IGARSS (2023)
Christian N. Koyama, Manabu Watanabe, Masato Hayashi, Masanobu Shimada, Kazufumi Kobayashi, Takeo Tadono
Advancements in Global Forest Monitoring Research Founded on ALOS-2 Long-Term Pantropical Land Observation. IGARSS (2022)
Manabu Watanabe, Christian N. Koyama, Masato Hayashi, Izumi Nagatani, Takeo Tadono, Masanobu Shimada
Trial of Detection Accuracies Improvement for JJ-FAST Deforestation Detection Algorithm Using Deep Learning. IGARSS (2021)
Edson Eyji Sano, Paola Rizzoli, Christian N. Koyama, Manabu Watanabe, Marcos Adami, Yosio Edemir Shimabukuro, Gustavo Bayma, Daniel M. Freitas
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. 13 (3) (2021)
Christian N. Koyama, Manabu Watanabe, Edson Eyji Sano, Masato Hayashi, Izumi Nagatani, Takeo Tadono, Masanobu Shimada
Improving L-Band SAR Forest Monitoring by Big Data Deep Learning Based on ALOS-2 5 Years Pan-Tropical Observations. IGARSS (2021)
Christian N. Koyama, Manabu Watanabe, Masato Hayashi, Izumi Nagatani, Takeo Tadono, Masanobu Shimada
Rainfall-Induced Changes in L-Band Backscatter Over Tropical Forests and Their Impact on Deforestation Monitoring. IGARSS (2020)
Izumi Nagatani, Masato Hayashi, Manabu Watanabe, Takeo Tadono, Tomohiro Watanabe, Christian N. Koyama, Masanobu Shimada
Seasonal Change Analysis for ALOS-2 PALSAR-2 Deforestation Detection. IGARSS (2020)
Manabu Watanabe, Christian N. Koyama, Masato Hayashi, Izumi Nagatani, Takeo Tadono, Masanobu Shimada
Trial of Deforestation Detection by Using 25M Resolution PALSAR-2/ScanSAR Data. IGARSS (2020)
Christian N. Koyama, Shunichi Koshimura, Motoyuki Sato
Advanced Polarimetric Stereo-Sar for Tsunami Debris Estimation and Disaster Mitigation. IGARSS (2019)
Christian N. Koyama, Manabu Watanabe, Masanobu Shimada
Mapping Spatial-Temporal Forest Heterogeneity in the Tropical Belt by ALOS-2/PALSAR-2 Big Data Analysis. IGARSS (2019)
Izumi Nagatani, Masato Hayashi, Manabu Watanabe, Takeo Tadono, Tomohiro Watanabe, Christian N. Koyama, Masanobu Shimada
Pixel-Based Deforestation Detection Algorithm for ALOS-2/PALSAR-2. IGARSS (2019)
Manabu Watanabe, Christian N. Koyama, Masato Hayashi, Izumi Nagatani, Takeo Tadono, Masanobu Shimada
Improvement of Deforestation Detection Algorithms Used In JJ-FAST. IGARSS (2019)
Manabu Watanabe, Christian N. Koyama, Masato Hayashi, Izumi Nagatani, Masanobu Shimada
Early-Stage Deforestation Detection in the Tropics With L-band SAR. IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens. 11 (6) (2018)
Izumi Nagatani, Masato Hayashi, Manabu Watanabe, Takeo Tadano, Tomohiro Watanabe, Christian N. Koyama, Masanobu Shimada
Forest Early Warning System Using ALOS-2/PALSAR-2 Scansar Data (JJ-FAST). IGARSS (2018)
Christian N. Koyama, Manabu Watanabe, Masanobu Shimada
Monitoring of Soil Moisture Dynamics in the Semi-Arid Tropics by Means of ALOS-2/PALSAR-2 Dual-Polarization ScanSAR Data. IGARSS (2018)
Manabu Watanabe, Christian N. Koyama, Masato Hayashi, Izumi Nagatani, Takeo Tadono, Masanobu Shimada
Semi-Automatic Deforestation Detection Algorithm with PALSAR-2/ScanSAR HH/HV Polarizations. IGARSS (2018)
Yasunari Mori, Takayoshi Yumii, Yumi Asano, Kyouji Doi, Christian N. Koyama, Yasushi Iitsuka, Kazunori Takahashi, Motoyuki Sato
Calibration Method for Multi Static Linear Array Radar with One Dimensional Array Antenna Arranged in Staggered Manner. IEICE Trans. Electron. (1) (2018)
Christian N. Koyama, Hai Liu, Kazunori Takahashi, Masanobu Shimada, Manabu Watanabe, Tseedulam Khuut, Motoyuki Sato
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. 9 (6) (2017)
Manabu Watanabe, Christian N. Koyama, Masanobu Shimada
Polarimetric characteristics of L-band SAR images of early-stage deforestation areas. IGARSS (2017)
Yasunari Mori, Takayoshi Yumii, Yumi Asano, Kyouji Doi, Christian N. Koyama, Yasushi Iitsuka, Kazunori Takahashi, Motoyuki Sato
Development of Multistatic Linear Array Radar at 10-20GHz. IEICE Trans. Electron. (1) (2017)
Christian N. Koyama, Manabu Watanabe, Masato Hayashi, Masanobu Shimada
The effect of precipitation and soil moisture variations on (partial) polarimetric L-band SAR backscatter in tropical forest regions. IGARSS (2017)
Manabu Watanabe, Christian N. Koyama, Masato Hayashi, Yutaka Kaneko, Masanobu Shimada
Development of early-stage deforestation detection algorithm (advanced) with PALSAR-2/ScanSAR for JICA-JAXA program (JJ-FAST). IGARSS (2017)
Hai Liu, Christian N. Koyama, Jinfeng Zhu, Qing Huo Liu, Motoyuki Sato
Post-Earthquake Damage Inspection of Wood-Frame Buildings by a Polarimetric GB-SAR System. Remote. Sens. 8 (11) (2016)
Christian N. Koyama, Yasushi Iitsuka, Kazunori Takahashi, Motoyuki Sato
Full polarimetric UWB GB-SAR for damage assessment of wooden building structures. IGARSS (2015)
Si-Wei Chen, Yongzhen Li, Xuesong Wang, Christian N. Koyama, Motoyuki Sato
Urban damage mapping using scattering mechanism investigation technique for fully polarimetric SAR data. IGARSS (2015)
Christian N. Koyama, Karl Schneider, Motoyuki Sato
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 (2015)
Christian N. Koyama, Motoyuki Sato
Estimation of soil moisture and debris pile volume from Pi-SAR2X and Pi-SAR-L2 square-flight data. IGARSS (2014)
Motoyuki Sato, Kazunori Takahashi, Hai Liu, Christian N. Koyama
Investigation on near range SAR for inspecting inner structure of buildings. IGARSS (2014)
Christian N. Koyama, Karl Schneider
Vegetation effects on L-band soil moisture retrieval - Lessons learned from 5 years of ALOS PALSAR observations. IGARSS (2012)
Christian N. Koyama, Karl Schneider
Soil moisture retrieval under vegetation using dual polarized PALSAR data. IGARSS (2011)