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ORCIDChristian N. Koyama
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2020 – today
- 2023
[c25]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: 1994-1997- [c24]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: 2633-2636 - 2022
- [c23]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: 4445-4448 - 2021
- [j6]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): 367 (2021) - [c22]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: 2911-2914 - [c21]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: 6747-6750 - 2020
- [c20]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: 3784-3787 - [c19]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: 3799-3802 - [c18]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: 3807-3810
2010 – 2019
- 2019
- [c17]Christian N. Koyama, Shunichi Koshimura, Motoyuki Sato:
Advanced Polarimetric Stereo-Sar for Tsunami Debris Estimation and Disaster Mitigation. IGARSS 2019: 4837-4840 - [c16]Manabu Watanabe, Christian N. Koyama, Masato Hayashi, Izumi Nagatani, Takeo Tadono, Masanobu Shimada:
Improvement of Deforestation Detection Algorithms Used In JJ-FAST. IGARSS 2019: 5328-5331 - [c15]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: 5332-5335 - [c14]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: 5336-5339 - 2018
- [j5]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. 101-C(1): 26-34 (2018) - [j4]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): 2127-2133 (2018) - [c13]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: 4177-4180 - [c12]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: 4181-4184 - [c11]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: 5513-5516 - 2017
- [j3]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. 100-C(1): 60-67 (2017) - [j2]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): 580 (2017) - [c10]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: 2446-2449 - [c9]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: 2450-2453 - [c8]Manabu Watanabe, Christian N. Koyama, Masanobu Shimada:
Polarimetric characteristics of L-band SAR images of early-stage deforestation areas. IGARSS 2017: 5330-5333 - 2016
- [j1]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): 935 (2016) - 2015
- [c7]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: 1316-1319 - [c6]Christian N. Koyama, Yasushi Iitsuka, Kazunori Takahashi, Motoyuki Sato:
Full polarimetric UWB GB-SAR for damage assessment of wooden building structures. IGARSS 2015: 2719-2722 - [c5]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: 3790-3793 - 2014
- [c4]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: 1516-1519 - [c3]Motoyuki Sato, Kazunori Takahashi, Hai Liu, Christian N. Koyama:
Investigation on near range SAR for inspecting inner structure of buildings. IGARSS 2014: 2601-2604 - 2012
- [c2]Christian N. Koyama, Karl Schneider:
Vegetation effects on L-band soil moisture retrieval - Lessons learned from 5 years of ALOS PALSAR observations. IGARSS 2012: 1231-1234 - 2011
- [c1]Christian N. Koyama, Karl Schneider:
Soil moisture retrieval under vegetation using dual polarized PALSAR data. IGARSS 2011: 1059-1062
Coauthor Index
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