Abstract
It is becoming easier to combine geographical data and dynamic models to provide information for problem solving and geographical cognition. However, the scale dependencies of the data, model, and process can confuse the results. This study extends traditional scale research in static geographical patterns to dynamic processes and focuses on the combined scale effect of multiscale geographical data and dynamic models. The capacity for topographical expression under the combined scale effect was investigated by taking multiscale topographical data and meteorological processes in Hong Kong as a case study. A meteorological simulation of the combined scale effect was evaluated against data from Hong Kong Observatory stations. The experiments showed that (1) a digital elevation model (DEM) using 3 arc sec data with a 1 km resolution Weather Research and Forecasting (WRF) model gives better topographical expression and meteorological reproduction in Hong Kong; (2) a fine-scale model is sensitive to the resolution of the DEM data, whereas a coarse-scale model is less sensitive to it; (3) better topographical expression alone does not improve weather process simulation; and (4) uncertainty arising from a scale mismatch between the DEM data and the dynamic model may account for 38 % of the variance in certain meteorological variables (e.g., temperature). This case study gives a clear explanation of the significance and implementation of scale matching for multiscale geographical data and dynamic models.
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Acknowledgments
The research presented in this article was supported by the National Natural Science Foundation of China (grant nos. 41171146, 41101370, and 41371424), the Innovation and Technology Fund of Hong Kong (grant no. ITS/042/12FP), and the Chinese University Hong Kong Direct Grant (grant no. 4052007).
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Zhang, C., Lin, H., Chen, M. et al. Scale matching of multiscale digital elevation model (DEM) data and the Weather Research and Forecasting (WRF) model: a case study of meteorological simulation in Hong Kong. Arab J Geosci 7, 2215–2223 (2014). https://doi.org/10.1007/s12517-014-1273-6
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DOI: https://doi.org/10.1007/s12517-014-1273-6