RyuLab@SNU

New paper led by Shaoyu Wang hashtag #RSE 📢 We developed a deep-learning based GPP model, #GPPnet, which only requires multi-channel #Sentinel2 reflectance and incoming light. No land cover, no VPD, no temperature. This simple model predicted canopy photosynthesis for both C3 and C4 (without separate models), captured drought/heatwave effects, light use efficiency and interannual variability. Why and how multi-channel reflectance can explain variations in canopy photosynthesis remains an open question—and an exciting avenue that deserves future study. Because all input data are available in real time on #GEE, we envision monitoring canopy photosynthesis any place, any time. Ultimately, integrating data-driven (GPP-net), semi-empirical (NIRvP), and process-based models (BESS) will enable a wide range of applications, from near-real-time crop monitoring to global estimates of photosynthesis. @DechantBenjamin @HelinZhang11301 @FengHuaize @IjeonghoN @ChanghyunChoi13 @snucals1 @SeoulNatlUni GPP-net: a robust high-resolution GPP estimation network for Sentinel-... sciencedirect.com/science/articl…

New paper in HESS 📄 We present a novel approach to estimating long-term mean transpiration–evapotranspiration (T/ET) ratios using the generalized proportionality hypothesis and watershed-scale hydrological observations. Blog coming soon. hess.copernicus.org/articles/30/31…

First AGU #AGU25 experience in an amazing city NewOrleans. Meeting with a lot of nice friends in of vegetation remote sensing! Especially the fantastic idea change during discussion. Looking forward to see you all next year in SF #sanfrancisco. @ryuyr77 @ZhouZhang10 @yangdi1031

Day 3 #AGU25 let's go! Not one, not two but three invited talks on the line up from @ryuyr77 and @PierreGentine. Also don't miss the sessions by @trevorkeenan, @JianingFang and Maoya. Details 👇 research.reading.ac.uk/lemontree/lemo…

Day 2 of #AGU25 and another great line up today with 3 LEMONTREE talks and a poster. research.reading.ac.uk/lemontree/lemo… @JianingFang @nick_greg_smith

It's #AGU2025! Great line up today from the team. Head over to the blog to get room details: research.reading.ac.uk/lemontree/lemo… @trevorkeenan @nick_greg_smith @ryuyr77

Our latest @NatureComms paper: Measuring global human accessibility to essential daily necessities and services. We compiled a global database of essential infrastructure and assessed human access to those daily essentials. @HKUniversity @HKUgeography rdcu.be/eTjVe

🚨New on the blog this week: LEMONTREE @SeoulNatlUni PhD student, Jisun Kim, shares her experience of fieldwork in Western Australia with @uwanews . research.reading.ac.uk/lemontree/fiel… @ryuyr77

Prof. Youngryel Ryu group from Department of Landscape Architecture and Rural Systems Engineering at SNU, led by PhD student Wonseok Choi, has demonstrated the potential of mid SR basis SIF to monitor crop stresses, and published this work in Remote Sensing of Environment.

@linsheng_wu @IjeonghoN Oh boy! Our mistake!

@ryuyr77 @IjeonghoN Wonderful work as always, Prof. Ryu! Just wondering — could the SIF unit (currently W m⁻² sr⁻¹ nm⁻¹) actually be mW m⁻² sr⁻¹ nm⁻¹? The magnitude seems to suggest so.

A new paper by our PhD student @IjeonghoN in Remote Sensing of Environment 📢 We developed a system that measures both directional and hemispherical hyperspectral reflectance and solar induced chlorophyll fluorescence controlled by two rotating prisms. This enables us to measure those quantities at different view geometries which will greatly support flux model development and evaluation, as well as satellite reflectance validation The original idea was developed by Joe Berry Ari Kornfeld who inspired us to improve their system during my sabbatical leave @CarnegieEcology in 2017. Thanks Joe and Ari! Generations of lab members devoted to develop/improve/maintain the system Jongmin Kim @DechantBenjamin Sangjun Lee @IjeonghoN The system will be used to evaluate Korean AgroForestry satellite Joongbin Lim, and many other satellites 🛰️ @snucals1 @SeoulNatlUni sciencedirect.com/science/articl…

How do we tell when plants are stressed—before our eyes can see it? Prof. Youngryel Ryu’s team has shown that even mid-resolution hyperspectral cameras can detect solar-induced chlorophyll fluorescence (SIF), a faint light emitted by plants that reveals early signs of stress. This breakthrough could make crop monitoring faster, cheaper, and more accessible using drones and satellites. Published in Remote Sensing of Environment: doi.org/10.1016/j.rse.… #SNUResearch #RemoteSensingofEnvironment #SIF #PlantHealth

We know how important career development is for our ECRs which is why we love to support secondments. Here is a blog on our latest secondment by PhD student Ananda Kurth: research.reading.ac.uk/lemontree/seco… #secondment #ECRs #CareerDevelopment @ryuyr77 @SeoulNatlUni @unibern @SteniBocker

Hot off the press 💐New international collaborative paper led by @WonseokFromESL and @ZarcoTejada team opened the door for scalable, cost-effective sun-induced chlorophyll fluorescence #SIF monitoring in precision agriculture and ecosystem studies — bridging the gap between expensive SIF hyperspectral systems and practical applications in the field. @snucals1 @SeoulNatlUni @HyperSensLab @Hyungsuk_Kimm Anirudh Belwalkar @TomasPoblete17 @YeonInsu Yeon Jae-Hyun Ryu Kyung-Do Lee @ZarcoTejada sciencedirect.com/science/articl…

After 20+ years of pioneering research, we’ve moved from scepticism to solid validation in detecting solar-induced fluorescence using mid-resolution hyperspectral imagery. New study led by @WonseokFromESL & @ryuyr77 and international collaborators. sciencedirect.com/science/articl…

Updates from our second Energy Partitioning Workshop👇  research.reading.ac.uk/lemontree/ener… @christiaanvandertoll @hliu6666 @ryuyr77 @xiangzLuo @Gabriel050111 @LisaWingateBdx, @shari__vw, @gisgter2008

Our annual meeting hosted this year by @ryuyr77 @snucals1 brought together our international team to share research updates, plan our next steps and train our ECRs in remote sensing. A very successful week. Read more 👇 research.reading.ac.uk/lemontree/annu…

Annual science meeting of @schmidtsciences @Lemontree_UofR project hosted in @SeoulNatlUni @snucals1 was filled with curiosity and fun! The program included one day of open seminars, two days of science meetings, and two days dedicated to the Early Career Researcher (ECR) summer school. The open seminar welcomed nearly 100 participants and featured presentations covering a wide range of topics on Eco-Evolutionary Optimality principles. The talks sparked many engaging questions and discussions. The science meeting highlighted updates from various working groups. It was a valuable opportunity for all of us to see the overall progress of the project, which led many discussions. The ECR summer school combined lectures on theory with hands-on training in LiDAR and hyperspectral remote sensing. We enjoyed a series of social activities too! 🍺 🐟 🥩 @SandyHarrisonRe Colin Prentice Heather Graven Xu Liang @PierreGentine @trevorkeenan Karin Rebel Hugo Jan de Boer @StockerBeni @nick_greg_smith @WangHanSci Pier Luigi Vidale Anna Agusti-Panareda Martin Best Sophia Cain Natalie Sanders Sarah Jones

@tobyzhang2005 @Lemontree_UofR @SeoulNatlUni @nick_greg_smith @dsandovalhdh @SandyHarrisonRe @WangHanSci Sorry-this is in-person only

@Lemontree_UofR @SeoulNatlUni @ryuyr77 @nick_greg_smith @dsandovalhdh @SandyHarrisonRe @WangHanSci Many interesting talks. Is this a hybrid event?

📢 Join us on 25th August @SeoulNatlUni for a one-day conference hosted by @ryuyr77 🌿 "Next generation land surface model with Eco-Evolutionary Optimality Principles" Showcasing research from the LEMONTREE team. 📍Details in the graphic 👇 Please share 🙏

The paper and dataset are all open-access.