GTAP Resources: Resource Display
| GTAP Resource #7780 |
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"Impacts of Different Spatial Resolution on Land-Use Downscaling" Authors: Zhao, Shurui, Tomoko Hasegawa, Shinichiro Fujimori, Koga Yamazaki and Ryo Totake Abstract This study examines how the spatial resolution of inputs affects land-use downscaling and environmental assessment. It compares two aggregation schemes for AIM-ALPHA outputs: a coarse 17-region mode and a finer 400-basin mode, both downscaled with AIM-PLUM from 2005 to 2100. The results show that the 400-basin mode better preserves spatial heterogeneity from the upstream model and produces land-use patterns that agree more closely with reference data. In the base year, its global Kappa coefficient is higher than that of the 17-region mode, indicating better reproducibility. It also reproduces upstream agricultural production more accurately, because less information is lost during aggregation. By contrast, the 17-region mode smooths basin-level differences, weakening the transmission of production signals into grid-level land allocation. Over time, differences between the two modes become larger, especially for cropland and forest. The finer-resolution basin mode generally produces more spatially dispersed land-use patterns and lower spatial autocorrelation, reflecting stronger retention of local variation. These differences also affect land-use-related CO2 emissions and biodiversity estimates. In some regions, especially Sub-Saharan Africa, China, and Southeast Asia, the two modes generate notably different Biodiversity Intactness Index values by 2100. Overall, the study concludes that using higher-resolution inputs improves land-use downscaling, strengthens consistency with upstream model outputs, and increases the reliability of environmental impact assessments linking IAMs and ESMs. |
| Resource Details () | GTAP Keywords | ||||||||||||||||
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- Climate change policy - Ecosystem services and biodiversity - Environmental policies - Land use - Sustainable development - Model extension/development - Software and modeling tools - Global |
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Public Access  Paper (2.0 MB) Replicated: 0 time(s)Restricted Access No documents have been attached. Special Instructions No instructions have been specified. |
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Last Modified: 4/15/2026 11:27:11 AM
