Methods for regulating the relationship between water and soil were summed up in 23 traditional waterscape and farmland design wisdom. Creating a reciprocal and mutually reinforcing relationship between water and soil in local area is the core of creating habitats through collection and diversion of water by cutting and filling earthwork. Moreover, two habitat creation modes, named collection mode and diversion mode, were put forward. Collection mode means building water catchment by cutting earthwork in land slope. Diversion mode means building dividing ridge by filling earthwork in inundation area. At the same time, spatial distribution pattern of two modes in river basin scale was proposed based on dynamic spatial relationship between slope and runoff inundation area. It presented a multiscale mosaic structure among diverse dividing ridges and water catchments. Potential in regulating the balance between water and soil and creating habitats being suitable for planting were shown clearly by the applications in ecological engineering practices. It could provide method and technology reference for ecological engineering practices in China.

Based on the flight quality monitoring big data, statistics were made on the frequency of low-altitude airplane turbulence in various airport areas. Besides, using topographic and meteorological data, we analyzed the correlation between low-altitude airplane turbulence and environmental factors. The results indicate a significant correlation between the low-altitude airplane turbulence and relief amplitude, wind speed, and diurnal temperature range. Also, the spatial difference of the effect intensity of these environmental factors is revealed via geographically weighted regression (GWR) model. The effect intensity of relief amplitude and wind speed increase from northeast to southwest, while the effect intensity of diurnal temperature range increases from southeast to northwest then to northeast. The adjusted R² of the model is 0.512, which means that the model is very effective. Based on the GWR model, we estimated the risk of low-altitude airplane turbulence on the national scale, and obtained the classification map of the risk. The research results have reference value for airport location and flight safety management.

Aiming at the deficiency of traditional polygon auto-construction algorithm in automation and time efficiency, which leads to the insufficiency of commercial GIS softwares’ data processing and spatial-temporal analysis ability, an arc splitting and polygon auto-construction algorithm based on plane sweep idea is proposed. Our algorithm contains three features as follows. First, it is a complete process from intersection testing until polygon construction. Next, it takes full advantage of useful information during intersection testing to realize arc splitting and polygon auto-construction at the cost of little algorithm complexity and computing resources. Finally, it avoids the calculation of nested relation and handles degenerate cases of bridge and dangling edge. The result of experiments proves the proposed algorithm improves efficiency significantly in comparison with traditional algorithms.