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Multi-source data fusion can help to weaken the original data's shortcomings while improving data accuracy. The experimental area in this research is Taiyuan City in Shanxi Province, China. Using SRTM1 DEM, ASTER GDEM V3, and AW3D30 DEM, the optimal resolution of the Fused DEM in the research area is determined by analyzing the topographic factor information entropy. Then the optimally weighted fusion coefficient of the DEM with root mean square error (RMSE) as the criterion under different slope classes is determined by traversal exploration and quantitatively evaluates the fusion effect. The results show that the optimal resolution of the Fused DEM is 40 m under the terrain feature constraint of Taiyuan city. The fused DEM decreases by 33.8%, 57.9%, and 11.5% for mean absolute error (MAE), 36.3%, 54.6%, and 1.4% for standard deviation (STD), and 32.8%, 54.2%, and 9.7% for root mean square error (RMSE) compared with SRTM1, ASTER GDEM V3, and AW3D30. The weighted average fusion of multiple intensities increased the accuracy of the original data. The reduced topographic factor errors, such as slope, profile curvature, and TPI, improved the Fused DEM's topographic representation capacity. Furthermore, the results confirm the high accuracy of Fused DEM in complex mountainous regions. [ABSTRACT FROM AUTHOR]

Urban ecosystem health assessment helps ensure sustainable urban development. As the provincial capital of Shanxi in China, Taiyuan's development also affects Shanxi, an area rich in coal resources, and its urbanization is closely related to the coal energy structure, which has led to ecological deterioration. This study aims to apply emergy synthesis and information entropy to estimate the urban ecosystem health of Taiyuan during the 2001-2017 period, to provide insight into the policy implications. The results indicated that the urban ecological health of Taiyuan has ameliorated during the 17-year period, mainly due to the resilience and ecological service capacity of Taiyuan urban ecosystem improved over the past 17 years. The continuous reduction of industrial waste emissions leads to ecosystem, which have resilience improving. However, we should be cautious since there are still a lot of problems with the organizational structure. And Taiyuan government still needs to adjust the current energy structure, optimize industrial structure, and reduce the dependence on the resources. [ABSTRACT FROM AUTHOR]