News

PolyU LSGI STEAM Talks for Secondary Schools Students 2025

The Department of Land Surveying and Geo-Informatics (LSGI) is organizing a STEAM Talk Series with the aim of introducing daily life applications and potential developments in Geo-Informatics. The series will cover a wide range of topics, including Land Surveying, Remote Sensing, Global Positioning System (GPS), Global Navigation Satellite System (GNSS), Geographic Information Science (GIS), and Underground Utilities Imaging and Diagnosis. We are delighted to invite all secondary schools to participate in our STEAM Talk Series in 2025. STEAM Talk Series Topics: Smart City and 3D Mapping in HK (智慧城巿及三維地圖的應用) Global Navigation Satellite System (GNSS) and Smart City Applications (全球導航衛星系統與智慧城市應用) Unfolding HK Lost WWII Heritage with Geo-spatial Science (尋找隱世二戰遺跡：地理空間科學篇) Problem Solving by Digital Maps and Geographic Information System (GIS) (以數字地圖和地理訊息系統解難) Seeing and Unseen Underground Utilities in 3D (三維地下管線測量) Observing and Measuring the Earth from Space (從太空觀測地球) IoT and Remote Sensing for Tree Monitoring (如何利用IoT及遙感技術監測城市樹木) Date:   From January to July 2025 (exact date to be suggested by school) Target audience:   S.1 – S.6 Students (both Art and Science students are welcome) Medium:   Cantonese or English Venue:   Secondary School or PolyU (a lab tour to be arranged at PolyU) Speaker:   Academic Staff from the Department of LSGI Please click here to know more the description for the STEAM talk topics. Interested parties please fill in the online application form to indicate your preference of talk. For any questions, please feel free to contact Mr Jimmy Kwan at 2766 4350 or jimmy.lh.kwan@polyu.edu.hk. Please find more about LSGI at our Facebook or Youtube channel.  LSGI Undergraduate Programme in 2025/26 BSc (Hons) Scheme in Spatial Data Science and Smart Cities (JS3130)

LSGI Scholar Invited to Represent Hong Kong and Present Hong Kong (China)’s Region/Country Report at the 2024 ASAIHL Conference

At the 2024 ASAIHL Conference (Association of Southeast Asian Institutions of Higher Learning), held at Universitas Airlangga in Surabaya, Indonesia, from 19-22 November 2024, LSGI Scholar Prof. George Zhizhao Liu was invited to represent Hong Kong and present the Region/Country Report for Hong Kong (China). This year's ASAIHL conference focused on the theme “University’s Role in Advancing Climate Crises Reduction.” At the conference, Prof. Liu delivered an invited talk titled “AI and Satellite Remote Sensing: The State-of-the-Art Technology to Map the Most Abundant Atmospheric Greenhouse Gas – Water Vapor.” His presentation highlighted the critical role of accurate water vapor observation in climate change and extreme weather studies and showcased the research conducted in his Micro-Laboratory of Atmospheric Research and Geomatics Engineering (Micro-LARGE) in the field of climate change. Water vapor, as the most abundant greenhouse gas in the atmosphere, plays a critically important role in climate change and extreme weather events. This challenges the common perception that carbon dioxide (CO2) is the largest greenhouse gas. Water vapor accounts for approximately 50% of atmospheric greenhouse gases, depending on weather conditions. However, accurately observing water vapor remains a global technical challenge. Numerous satellites have been launched with the capability to observe water vapor across different wavelength channels. Unfortunately, the accuracy of water vapor data from most of these satellite sensors is low and does not meet the requirements for climate change and extreme weather studies. Prof. Liu’s Micro-LARGE Lab has insightfully identified this issue and developed various AI-based algorithms to significantly enhance the accuracy of water vapor observations from different satellite sensors. The Association of Southeast Asian Institutions of Higher Learning (ASAIHL), founded in Bangkok, Thailand, in 1956, is a non-governmental organization that began with eight state universities in Southeast Asia. It now includes university members from Europe, North America, Africa, and Oceania. ASAIHL aims to assist member institutions in strengthening themselves through mutual support and achieving international distinction in teaching, research, and public service. Additionally, Prof. Liu recently delivered a specially invited presentation at the 6th National Mesoscale Meteorology Conference, hosted by Sun Yat-sen University (Zhuhai) in Zhuhai, Mainland China, from 7-10 November 2024.

“Deep Space Exploration: Technology and Science” at the PolyU AIR Summit 2024

On 19 November 2024, "Aerospace Innovation Research Summit (AIR Summit)" was held at the Hong Kong Polytechnic University. The morning session from was held at Jockey Club Auditorium, PolyU. The event was co-organized by below units and departments:  RIO, Research and Innovation Office KTEO, Knowledge Transfer and Entrepreneurship Office PReCIT, Policy Research Centre for Innovation and Technology AAE, Department of Aeronautical and Aviation Engineering RCDSE, Research Centre for Deep Space Explorations LSGI, Department of Land Surveying and Geo-informatics OASA, The Orion Astropreneur Space Academy  A parallel session was held by the Department of Land Surveying and Geo-Informatics (LSGI) and the Research Centre for Deep Space Explorations (RCDSE) at the afternoon, themed “Deep Space Exploration: Technology and Science.” This event brought together leading experts from both governmental and private sectors to delve into cutting-edge technologies and advancements in the field of space exploration. Professor Wu Chen, Head of the Department of LSGI, delivered an insightful presentation on “Resilient Ubiquitous Positioning: Prospects and Challenges.” Additionally, Professor Wu Bo, Associate Head of LSGI and Associate Director of RCDSE, presented research on advanced 3D mapping techniques for landing site analysis and precise landing. The session also featured distinguished keynote speakers, including: Prof. Li Yiliang, Professor of Astrobiology, Department of Earth Sciences, The University of Hong Kong Dr. Yuri Skorov, Scientist, Planetary Science Department Max Planck Institute for Solar System Research Mr. Zhang Xiaomin, Chairman & General Manager, Beijing AZSPACE Technology Company Limited Mr. Kenny Chan, Senior Land Surveyor/Geodetic, Lands Department, The Government of the HKSAR Dr. Chen Ruizhi, Professor, School of Data Sciences, Chinese University of Hong Kong, Shenzhen Dr. Yusra Abdulrahman,  Assistant Professor, Department of Aerospace Engineering, Lab Lead, Transformative Aerospace Lab, Khalifa University  Ms. Li Yining, Senior Executive, General Management Department, Satellite Data and Application International Cooperation Center, China National Space Administration (CNSA) This session provided a platform for collaborative dialogue and knowledge exchange among experts at the forefront of space exploration technology and science. AIR Submit  

Workshop on Smart City and 3D Mapping in HK at Geospatial Lab

On 16 November 2024, the Geospatial Lab hosted a workshop titled "Smart City and 3D Mapping in Hong Kong" at the Geospatial Lab. We sincerely thank all participants for their enthusiastic engagement and support.   Dr. Sissi Chen, Lecturer of LSGI, was invited to be the guest speaker for the talk. Dr. Chen presented various perspectives on how spatial data can be leveraged to optimize resource allocation, alleviate traffic congestion, and enhance public safety, ultimately improving the quality of life in urban environments. We hope all participants can understand the significance of spatial data and also acquired insights on how to apply it to real-world problems after attending the workshop.   Click here to read more.

30th Congregation - LSGI session

The 30th Congregation for the Faculty of Construction and Environment – LSGI session was held on 14 November 2024 at the Jockey Club Auditorium. Professor Xiang-dong Li, Dean of the Faculty, officiated the ceremony. We were honored to have Mr. Kelvin Lo Kwok Wah, SBS, Director (Development and Works) of the Hospital Authority, HKSAR Government, as the Guest of Honour. During the ceremony, over 170 students graduated with Higher Diplomas, Bachelor’s degrees, Postgraduate Diplomas, and Master’s degrees. Miss Chan Chi Yin, the LSGI graduate representative for the Bachelor of Science in Land Surveying and Geo-Informatics, delivered the valedictory speech. Her address expressed heartfelt gratitude for the unwavering support and guidance received from professors, parents, and classmates throughout their academic journey, marking the event as a memorable milestone for all attendees. Congratulations to the graduating class of 2024! 

Prof. Wu Bo gathers fresh evidence indicating ocean on Mars billion years ago

A research team led by Prof. WU Bo, Associate Head of LSGI and Associate Director of Research Centre for Deep Space Explorations, have gathered new evidence that Mars once hosted an ocean billions of years ago. This discovery was made through the analysis of data from China’s Zhurong rover and orbiting satellites. Prof. Wu was interviewed by the Reuters on 8 Nov 2024 and shared that these findings not only provide further evidence to support the theory of a Martian ocean but also introduce, for the first time, a discussion on its probable evolutionary scenario. Dr Sergey Krasilnikov, Research Assistant Professor of LSGI and co-author of the study, noted that during the early history of Mars, when it likely had a dense, warm atmosphere, the possibility of microbial life was significantly higher. Click here to read more above the interview.   Online coverage on the sharing: Reuters - https://polyu.me/4hGxwaq Nature - https://polyu.me/3YW7vgd SCMP - https://polyu.me/4hBxDEm DayFR Euro - https://polyu.me/4hH3ZNV NDTV - https://polyu.me/3Cs7WWy Daily Mail - https://polyu.me/4ffDu0F The Strait Times - https://polyu.me/3YGpPID New Scientist - https://polyu.me/4er7uVP Gulf News - https://polyu.me/40JlNlo Guam Pacific Daily News - https://polyu.me/4fD2gaB Saipan Tribune - https://polyu.me/3UGJVkU Khaleej Times - https://polyu.me/4hGuFhK Nation - https://polyu.me/3AzD99U RTE - https://polyu.me/3YZPTyX Yahoo HK - https://polyu.me/4eqU10m NetEase - https://polyu.me/4fh2qF0 qq - https://polyu.me/3YHZpq2 USA News Hub - https://polyu.me/3Z3gHPL The Japan News - https://polyu.me/4frfjfD Bastille Post - https://polyu.me/4fBSIwG 亞省新聞網 - https://polyu.me/4fNjPVp

LSGI Staff Appointed as the Chief Scientist of Meteorological Observation Center of the China Meteorological Administration

We are pleased to share with you that Prof. George Zhizhao Liu, a professor and Associate Head (partnership) at the Department of Land Surveying & Geo-Informatics (LSGI), Hong Kong Polytechnic University, has been appointed as the Chief Scientist of the Meteorological Observation Center, China Meteorological Administration (CMA). The CMA is China’s national agency responsible for weather forecasting service and climate research in China and globally. The Meteorological Observation Center, one of the major organizations under CMA, is responsible for constructing China’s real-time meteorological observation platform and providing accurate, timely meteorological observations to support China’s national/global operational weather forecasting services as well as to share with the World Meteorological Organization. In addition, the Meteorological Observation Center also takes a leading role in the development of new meteorological observation techniques and equipment, such as China’s Meteorological GNSS Network. Prof. Liu is an internationally respected scholar with both industrial and academic experiences in academic research as well as applications of geomatics technologies. Over the years, Professor Liu’s Micro-Laboratory of Atmospheric Research and Geomatics Engineering (Micro-LARGE) has made significant contributions to the community through unique developments and innovations in various areas, including Global Positioning System (GPS)/Global Navigation Satellite System (GNSS) precise positioning algorithms and data quality analysis, ionosphere scintillation monitoring and 3D Total Electron Content (TEC) modeling, impact of space weather on satellite navigation and flight operation, monitoring of atmospheric water vapor and 3D modeling, retrieval and calibration of satellite remote sensing water vapor data, and assimilation of atmospheric water vapor in Numerical Weather Prediction (NWP) models. The NWP rainstorm forecasting scores are significantly improved after the assimilation of water vapor data. As a recognized authority in atmospheric water vapor observation using GPS/GNSS and remote sensing satellite techniques, Prof. Liu serves as the only China’s representative on the GNSS Water Vapor Working Group of the Global Climate Observing System (GCOS) Upper-Air Network. His Micro-LARGE Lab is the first one in the world to calibrate all-weather (including cloudy condition) near-infrared (NIR) band satellite remote sensing water vapor data and also the first one to assimilate all-weather NIR band satellite remote sensing water vapor data into NWP. His Micro-LARGE Lab is the first one internationally to study and evaluate the impact of space weather on flight operation from an economic cost perspective and to propose response strategies, which was highly commended by senior scientist at the NASA JPL and was selected as a research highlight in the Nature Reviews Earth & Environment Journal (IF: 42.1). Multiple algorithms developed by the Micro-LARGE for GNSS data processing have been widely used by research groups in many universities, research institutions and industries worldwide. Prof. Liu’s appointment with the Meteorological Observation Center, CMA, is expected to strengthen collaboration between scientists at PolyU, Hong Kong, and the broader meteorological community in Mainland China.

Prof. Jianli Chen Published a Breakthrough Study in Nature

Prof. Jianli Chen, a professor in the Department of Land Surveying and Geo-Informatics, has co-authored a new study published in Nature, unveiling a surprising discovery: a substantial amount of meltwater is temporarily stored within the Greenland Ice Sheet during summer months. For the first time, an international group of researchers was able to quantify meltwater with positioning data. The finding challenges current models of how ice sheets contribute to global sea level rise. The Greenland Ice Sheet is currently the largest single contributor to global sea level rise, with the potential to raise the mean sea level by up to seven meters if completely melted. While scientists have long studied the melt processes of the ice sheet, one crucial question has remained unanswered: how does meltwater storage evolve within the ice sheet throughout the summer melt season? A new approach provides an unprecedented view into the movement and storage of meltwater. The team has utilized data from the Greenland GPS Network (GNET). The network consists of several tens of stations around Greenland that continuously provide positioning data. The team developed an innovative method that interprets the detected vertical displacements of the bedrock. These displacements are caused by, among others, the mass of melting water, pushing the bedrock down. "During. the melt season, we found that a significant fraction of meltwater mass is stored temporarily within the ice sheet," says Jiangjun Ran, the lead author and associate professor at the Southern University of Science and Technology, "This water buffering effect peaks in July and slowly recedes in the following weeks."   “GRACE satellite gravity measurements provide independent validation of the significant finding from GNET surface deformation observations,” adds Prof. Chen, a world leading expert in satellite gravimetry, “Integrating different modern space geodetic techniques plays an important role in tackling the challenges of climate change.” This discovery will help improve climate models, which often underestimate the complexity of water storage within ice sheets. Especially during warmer years, models that predict water runoff towards the ocean may easily underestimate that process. The study finds that these models could require scaling adjustments of up to 20% for the warmest years.  The study has taken years of preparation and required difficult expeditions to some of the most remote areas of the planet. This large joint effort highlights the importance of international collaboration in addressing one of the planet's most pressing environmental challenges. The study was published on Oct. 30, 2024 in Nature: Vertical bedrocks shifts reveal summer water storage in Greenland ice sheet.

Prof. CHEN Wu Featured on TVB News Discussing Drone Safety

Prof. Chen Wu, Head of the Department of Land Surveying and Geo-Informatics, Associate Director of the Research Institute for Artificial Intelligence of Things, and Chair Professor of Satellite Navigation, was interviewed on TVB’s “News Magazine.” The discussion focused on safety concerns related to developing a low-altitude economy in Hong Kong.   For more details, watch the interview here: Youtube   Online coverage: TVB - https://polyu.me/40lxL4S (20:12 - 21:13)

PolyU Info Day 2024

PolyU Info Day, held on 12th October 2024, achieved remarkable success with a record-breaking visitor number of over 41,000. The Department of Land Surveying and Geo-Informatics (LSGI) received active participation from academic and supporting staff, students, and alumni, providing secondary school students, parents, and individuals with the latest information about the admission and academic programmes of LSGI. Throughout the event, LSGI engaged visitors with a variety of informative activities, including booth consultations, admission talks for both Bachelor's (BSc) and Master's (MSc) programmes, alumni sharing sessions, thematic discussions by current students, and guided lab tours. Notably, over 230 participants attended the admission talks, while more than 120 individuals took part in the guided tours, reflecting a strong interest in our programmes.  During the two sessions of BSc admission talks, Ir Prof. Wallace LAI, Associate Head and Professor, and Dr Sissi CHEN, Deputy Programme Leader and Lecturer, provided in-depth insights into the curriculum and opportunities available within the LSGI programmes. Dr Xintao LIU and Dr Yang XU, programme leaders of MSc programmes, gave introduction on admission and characteristics of two master's degree programmes. Additionally, two young LSGI graduates shared their professional journeys, emphasizing the exciting career opportunities in the public and private sectors. We extend our heartfelt gratitude to our alumni, Mr. Kwok Kam-Ngai, Sales and Support Engineer at RIEGL Asia Pacific Ltd, and Ms. Amelia Ng, Land Surveyor at the Lands Department, for their valuable contributions during the sharing BSc sessions. Their experiences provided prospective students with a real-world perspective on the diverse paths available within the field of land surveying and geo-informatics. Furthermore, LSGI student Sammy Chan delivered an engaging presentation during the Faculty of Construction and Environment (FCE) thematic talk, enriching the dialogue with insights from a current student’s viewpoint.