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Changhyun Choi

Seoul National University

Kwanak-gu

Seoul, 151-742

Korea, Republic of (South Korea)

  • Seoul National University

SCHOLARLY PAPERS

7

DOWNLOADS

725

TOTAL CITATIONS

4

Scholarly Papers (7)

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1.

Enabling 30 M Maize Mapping Without Ground Reference Leveraging Multiple Satellite Platforms in Brazil and Argentina

Downloads 183 (413,774)

Enabling 30 M Maize Mapping Without Ground Reference Leveraging Multiple Satellite Platforms in Brazil and Argentina

Number of pages: 50 Posted: 26 Feb 2025
Ryoungseob Kwon, Youngryel Ryu, Philippe Ciais, David Makowski, Changhyun Choi, Huaize Feng, Sungchan Jeong and Kyungdo Lee
Seoul National University, Seoul National University, University of Paris-Saclay, University of Paris-Saclay - INRAE, Seoul National University, Seoul National University, Seoul National University and affiliation not provided to SSRN
Downloads 111 (639,071)

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Maize mapping, Without field-visits, Cropping intensity, Transfer-learning, Google Earth Engine

Enabling 30 M Maize Mapping Without Ground Reference Leveraging Multiple Satellite Platforms in Brazil and Argentina

Number of pages: 46 Posted: 25 Jan 2025
Youngryel Ryu, Ryoungseob Kwon, Philippe Ciais, David Makowski, Huaize Feng, Sungchan Jeong, Changhyun Choi and Kyungdo Lee
Seoul National University, Seoul National University, University of Paris-Saclay, University of Paris-Saclay - INRAE, Seoul National University, Seoul National University, Seoul National University and affiliation not provided to SSRN
Downloads 72 (871,518)

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Maize mapping, Without field-visits, Cropping intensity, Random Forest, Google Earth Engine

2.

Gpp-Net: A Robust High-Resolution Gpp Estimation Network for Sentinel-2 Using Only Surface Reflectance and Photosynthetically Active Radiation

Number of pages: 30 Posted: 08 May 2025
Shaoyu Wang, Youngryel Ryu, Benjamin Dechant, Helin Zhang, Huaize Feng, Jeongho Lee and Changhyun Choi
Seoul National University, Seoul National University, University of Leipzig, Seoul National University, Seoul National University, Seoul National University and Seoul National University
Downloads 121 (592,433)

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Gross primary productivity, Near-infrared reflectance of vegetation, Photosynthetically active radiation, Sentinel-2, Deep Learning

3.

Correcting Confounding Canopy Structure, Biochemistry and Soil Background Effects Improves Leaf Area Index Estimates Across Diverse Ecosystems from Sentinel-2 Imagery

Number of pages: 46 Posted: 04 Feb 2024
Liang Wan, Youngryel Ryu, Benjamin Dechant, Yorum Hwang, Huaize Feng, Yanghui Kang, Sungchan Jeong, Jeongho Lee, Changhyun Choi and Joonhwan Bae
Seoul National University, Seoul National University, University of Leipzig, Boston University, Seoul National University, University of California, Berkeley, Seoul National University, Seoul National University, Seoul National University and Seoul National University
Downloads 109 (645,052)

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Leaf area index (LAI), Hybrid method, Canopy structure, Soil background, Near-infrared reflectance of vegetation (NIRV), PROSAIL model, Sentinel-2

4.

Mapping Carbon Stock of Individual Street Trees Using Lidar-Camera Fusion-Based Mobile Mapping System

Number of pages: 42 Posted: 17 Mar 2024
Tackang Yang, Youngryel Ryu, Ryoungseob Kwon, Changhyun Choi, Zilong Zhong, Yunsoo Nam and Seongwoo Jo
Seoul National University, Seoul National University, Seoul National University, Seoul National University, Seoul National University, Seoul National University and Seoul National University
Downloads 104 (669,616)

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mobile mapping system, LiDAR-camera fusion, street tree, urban carbon stock

5.

Time-Series Sentinel-2 Data Improve High-Resolution Forest Canopy Height Mapping by Capturing Species Information

Number of pages: 35 Posted: 08 May 2025
Changhyun Choi, Youngryel Ryu, Benjamin Dechant, Tackang Yang, Liang Wan, Sungchan Jeong and Jin Wu
Seoul National University, Seoul National University, University of Leipzig, Seoul National University, Seoul National University, Seoul National University and The University of Hong Kong
Downloads 87 (759,537)

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Canopy Height Model (CHM), Canopy structure, Lidar, Sentinel-2, Time-series, Species, Phenology, Convolution Neural Network (CNN)

6.

Mapping Large-Scale Pantropical Forest Canopy Height by Integrating Gedi Lidar and Tandem-X Insar Data

Downloads 84 (777,583)
Citation 3

Mapping Large-Scale Pantropical Forest Canopy Height by Integrating Gedi Lidar and Tandem-X Insar Data

Number of pages: 100 Posted: 31 Jul 2024
Wenlu Qi, John Armston, Changhyun Choi, Atticus Stovall, Svetlana Saarela, Matteo Pardini, Temilola Fatoyinbo, Konstantinos Papathanassiou, Adrian Pascual and Ralph Dubayah
affiliation not provided to SSRN, University of Maryland, College Park, Seoul National University, University of Maryland, College Park, Norwegian University of Life Sciences, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Maryland, College Park and University of Maryland, College Park
Downloads 46 (1,131,842)

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Forest height, Fusion, Lidar, GEDI, InSAR, TanDEM-X, Model-based inference

Mapping Large-Scale Pantropical Forest Canopy Height by Integrating Gedi Lidar and Tandem-X Insar Data

Number of pages: 100 Posted: 01 Aug 2024
Wenlu Qi, John Armston, Changhyun Choi, Atticus Stovall, Svetlana Saarela, Matteo Pardini, Temilola Fatoyinbo, Konstantinos Papathanassiou, Adrian Pascual and Ralph Dubayah
affiliation not provided to SSRN, University of Maryland, College Park, Seoul National University, University of Maryland, College Park, Norwegian University of Life Sciences, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Maryland, College Park and University of Maryland, College Park
Downloads 38 (1,238,337)
Citation 3

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Forest height, Fusion, Lidar, GEDI, InSAR, TanDEM-X, Model-based inference

7.

Mapping Carbon Stock and Growth of Individual Street Trees Using Lidar-Camera Fusion-Based Mobile Mapping System

Number of pages: 51 Posted: 22 Feb 2025
Tackang Yang, Youngryel Ryu, Ryoungseob Kwon, Changhyun Choi, Zilong Zhong, Yunsoo Nam and Seongwoo Jo
Seoul National University, Seoul National University, Seoul National University, Seoul National University, Seoul National University, Seoul National University and Seoul National University
Downloads 37 (1,236,159)
Citation 1

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mobile mapping system, LiDAR-camera fusion, street tree, urban carbon stock