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Youngryel Ryu

Seoul National University

Kwanak-gu

Seoul, 151-742

Korea, Republic of (South Korea)

SCHOLARLY PAPERS

13

DOWNLOADS

1,045

TOTAL CITATIONS

1

Scholarly Papers (13)

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

Number of pages: 50 Posted: 26 Feb 2025
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)

Abstract:

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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
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.

Rapid Changes in Terrestrial Carbon Dioxide Uptake Captured in Near-Real Time from a Geostationary Satellite: The Alive Framework

Number of pages: 50 Posted: 03 Jul 2024
University of Wisconsin-Madison, University of Wisconsin-Madison, University of Wisconsin-Madison, Columbia University, University of Wisconsin-Madison, University of Wisconsin-Madison, Seoul National University, Seoul National University and University of Wisconsin-Madison - Univeristy of Wisconsin-Madison
Downloads 157 (474,889)

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carbon, gross primary productivity, Geostationary Satellite, GOES-R, Machine learning, gradient boosting, downwelling shortwave radiation, surface reflectance, eddy covariance, zarr, near real-time, sub-daily, CONUS, visible, near infrared, shortwave infrared, NIRv, NIRvP, MODIS, BESS

3.

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
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

4.

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
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

5.

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

Number of pages: 42 Posted: 17 Mar 2024
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

6.

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

Number of pages: 35 Posted: 08 May 2025
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)

7.

Detecting Plant Physiological Changes Under Stress Using Sun-Induced Chlorophyll Fluorescence from Mid-Spectral Resolution Imagery

Number of pages: 60 Posted: 31 Jan 2025
Seoul National University, Seoul National University, Seoul National University, University of Melbourne, University of Melbourne, Seoul National University, affiliation not provided to SSRN, affiliation not provided to SSRN and University of Melbourne
Downloads 72 (860,052)

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Far-red sun induced chlorophyll fluorescence, spectral fitting method, DCMU, mid spectral resolution imaging spectroscopy

8.

The spatial extent of agroforestry lands in Africa

Number of pages: 33 Posted: 03 Dec 2025
Tsinghua University, University of Copenhagen, University of Paris-Saclay, University of Paris-Saclay - INRAE, Seoul National University, affiliation not provided to SSRN, Tsinghua University, Tsinghua University, Tsinghua University, Tsinghua University, affiliation not provided to SSRN, University of Copenhagen, affiliation not provided to SSRN, Chinese Academy of Sciences, China Agricultural University and Tsinghua University
Downloads 69 (891,180)

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Agroforestry, trees in croplands, trees in rows, scattered trees, U-Net

9.

Development of an Automated Hyperspectral System to Simultaneously Monitor Hyperspectral Reflectance and Sun-Induced Chlorophyll Fluorescence with Directional and Hemispheric View Geometries

Number of pages: 48 Posted: 19 Apr 2025
Seoul National University, Seoul National University, Kyung Hee University, University of Leipzig, Seoul National University and affiliation not provided to SSRN
Downloads 62 (942,565)

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Proximal remote sensing, Viewing geometry, Sun-Induced Chlorophyll Fluorescence (SIF), Hyperspectral reflectance, Hyperspectral instrument, Rice paddy, mixed forest

10.

A simple physically-based approach to estimate fraction of absorbed photosynthetically active radiation by near-infrared albedo of vegetation

Number of pages: 42 Posted: 13 May 2026
China Agricultural University, China Agricultural University, Seoul National University, affiliation not provided to SSRN, University of Valencia - Image Processing Laboratory, Wageningen University, affiliation not provided to SSRN, China Agricultural University, Southwest Jiaotong University, China Agricultural University, China Agricultural University, The University of Hong Kong, China Agricultural University, Qinghai Institute of Technology and Government of the United States of America - Pacific Northwest National Laboratory
Downloads 37 (1,263,436)

Abstract:

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Fraction of absorbed photosynthetically active radiation, Near-infrared albedo of vegetation, Spectral invariants theory, Directional effect, Energy conservation law

11.

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
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

12.

Optimal estimation of far-red sun-induced chlorophyll fluorescence from high altitude airborne observations

Number of pages: 45 Posted: 10 Apr 2026
Seoul National University, Seoul National University, Government of the United States of America - Jet Propulsion Laboratory, Government of the United States of America - Jet Propulsion Laboratory, University of Melbourne, Government of the United States of America - Jet Propulsion Laboratory, Government of the United States of America - Jet Propulsion Laboratory, University of Melbourne and Republic of Argentina - Consejo Superior de Investigaciones Científicas (CSIC)
Downloads 7 (1,561,096)

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SIF, atmospheric correction, airborne, isofit, pressure elevation, aerosol

13.

A Source-Free Unsupervised Domain Adaptation Framework for Large-Scale, In-Season Soybean Mapping

Posted: 24 Jul 2025 Last Revised: 03 Nov 2025
Seoul National University, Seoul National University, Seoul National University, Seoul National University and affiliation not provided to SSRN

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Soybean mapping, Early-season mapping, Source-free domain adaptation, Contrastive learning, Deep learning, Sentinel-2 imagery