On 7 May 2022, Prof. Qihao Weng of the Department of Land Surveying and Geo-Informatics (LSGI) gave an inspiring online lecture on the topic “The Greater Bay Area (GBA) from Space: Daytime vs. Nighttime, and Big Data vs. Small Data” as part of the PolyU Online Lecture Series organised by Global Engagement Office (GEO). Prof. Weng analysed the urbanisation process in the GBA by comparing big data and small data methods during the one-hour lecture which was well-attended by around 250 prospective Joint Entrance Exam (JEE) students from the Mainland China. Prof. Weng’s lecture gave prospective JEE students a glimpse into PolyU’s educational and research excellence.