The Global Land Surface Satellite (GLASS) Products suite has been expanded from the original 5 products (Liang, et al., 2013a,b) to the current 20 products:
| NO. | GLASS product | Temporal range | Temporal resolution | Spatial resolution |
|---|---|---|---|---|
| 1. | Leaf Area Index (LAI) | 1981-2022 | 8 days | 250m/500m/1km/0.05° |
| 2. | Broadband Albedo (Albedo) | 1981-2022 | 8 days | 250m/500m/1km/0.05° |
| 3. | Broadband Emissivity(BBE) | 1981-2022 | Daily | 0.05° |
| 4. | Photosynthetically Active Radiation (PAR) | 2000-2022 | Daily | 0.05° |
| 5. | Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) | 1981-2022 | 8 days | 250m/500m/1km/0.05° |
| 6. | Downward Shortwave Radiation (DSR) | 2000-2022 | Daily | 0.05° |
| 7. | Surface Long-Wave Radiation (LWR) | 2000-2022 | Instantaneous/8 days | 1km/0.05° |
| 8. | All-Wave Net Radiation (NR) | 1981-2022 | Daily | 0.05° |
| 9. | Land Surface Temperature (LST) | 1981-2022 | Instantaneous/Daily | 1km/0.05° |
| 10. | Al-Weather/Gap-free Land Surface Temperature (Al-Weather/Gap-free LST) | 20111-2021 | 8 days | 2km/0.02°/0.05° |
| 11. | Land Surface Air Temperature (Ta) | 2000-2020 | Daily | 1km |
| 12. | Fractional Vegetation Coverage (FVC) | 1981-2022 | 8 days | 500m/0.05° |
| 13. | Evapotranspiration (ET) | 1981-2022 | 8 days | 1km/0.05° |
| 14. | Gross Primary Production (GPP) | 1981-2022 | 8 days | 500m/1km/0.05° |
| 15. | Net Primary Production (NPP) | 1981-2022 | 8 days | 500m/1km/0.05° |
| 16. | Global Forest Aboveground Biomass (AGB) | 1985-2015 | 5 years | 0.05° |
| 17. | Snow Cover Extent over the Tibetan Plateau (TPSCE) | 1982-2018 | 8 days | 0.05° |
| 18. | Snow-free Blue-sky Land Surface Albedo Climatology | 1981-2022 | 8 days | 500m/0.05°/0.5° |
| 19. | Normalized difference vegetation index (NDVI) | 2000-2021 | 8 days | 250m/0.05°/0.1°/0.25° |
| 20. | Enhanced Vegetation Index (EVI) | 2000-2021 | 8 days | 250m/0.05°/0.1°/0.25° |
The Department of Geography at the University of Hong Kong (GEOG | HKU) offers a variety of courses and research opportunities, dedicated to the multidisciplinary study and education of geographical sciences. The department provides undergraduate and graduate programs covering fields such as human geography, physical geography, and environmental geography. Students can choose to major in geography or expand their studies through interdisciplinary courses such as urban governance.
The Jockey Club Quantitative Remote Sensing Laboratory (JCQRS Lab) focuses on the application of remote sensing technology in environmental monitoring and analysis. Research directions in the lab include climate change, land use change, ecosystem services, among others, utilizing advanced remote sensing techniques and data analysis methods to provide environmental management and decision support.
For more detailed information or to inquire about specific course offerings and research projects, you can visit the Department of Geography at the University of Hong Kong website (GEOG | HKU) and the Jockey Club Quantitative Remote Sensing Laboratory website (JCQRS Lab).
Perhaps you can obtain more information about the GLASS product in the GLASS Brochure and BAMS Digital Edition of GLASS.
1. Many of these products span over 35 years -- from 1981 to the present, especially valuable for long-term environmental change studies;
2. The radiation products have the spatial resolution of 5km, much finer than the commonly used products (e.g., CERES, GEWEX);
3. All products are spatially and temporally continuous with no gaps and missing values;
4. The broadband longwave emissivity product is the first product of this kind in the world at 8-day temporal resolution and 1km spatial resolution;
5. The GLASS products have been demonstrated to have high quality and accuracies. They have been widely used.
[1] Liang, S., Zhao, X., Yuan, W., Liu, S., Cheng, X., Xiao, Z., Zhang, X., Liu, Q., Cheng, J., Tang, H., Qu, Y.H., Bo, Y., Qu, Y., Ren, H., Yu, K., & Townshend, J. (2013a). A Long-term Global LAnd Surface Satellite (GLASS) Dataset for Environmental Studies. International Journal of Digital Earth, 6, 5-33.
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[2] Liang, S., Zhang, X., Xiao, Z., Cheng, J., Liu, Q., & Zhao, X. (2013b). Global LAnd Surface Satellite (GLASS) products: Algorithms, validation and analysis. Springer.
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[3] Liang, S., Cheng, C., Jia, K., Jiang, B., Liu, Q., Xiao, Z., Yao, Y., Yuan, W., Zhang, X., Zhao, X., & Zhou, J. (2020). The Global LAnd Surface Satellite (GLASS) products suite. Bulletin of the American Meteorological Society, DOI: 10.1175/BAMS-D-18-0341.1.
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[4] Li Shunlin, Chen Xiaona, Chen Yan, Cheng Jie, Jia Kun, Jiang Bo, Li Bing, Liu Qiang, Ma Han, & Song Liulin. (2023). New Developments in the Research and Development of GLASS Land Surface Satellite Remote Sensing Products. Journal of Remote Sensing, 27(4).
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