a watershed management program is usually based on the results of watershed modeling. accurate modeling results are decided by the appropriate parameters and input data. precipitation is the most important input for watershed modeling. precipitation characteristics usually exhibit significant spatial variation, even within small watersheds. therefore, properly describing the spatial variation o...

A watershed management program is usually based on the results of watershed modeling. Accurate modeling results are decided by the appropriate parameters and input data. Precipitation is the most important input for watershed modeling. Precipitation characteristics usually exhibit significant spatial variation, even within small watersheds. Therefore, properly describing the spatial variation o...

With the rapid development of China’s economy and acceleration urbanization, expansion urban space has led to a growing demand for land that resulted in destruction expropriation large amount ecological China. In face current situation resource constraints, environmental degradation, ecosystem destruction, it is necessary thoroughly study territorial China its evolution rules. Based on previous...

The urban surface temperature is a complex integrated natural-human geographic phenomena; with the development of geostatistical methods and application multisource data, its research has gradually shifted from single perspective to study that integrates multiple factors such as nature humanity. However, based on context integration natural human mutual constraints each factor, mechanism influe...

This thesis proposes an improved interactive brain tumor segmentation method based on graph cuts, which is an efficient global optimization framework for image segmentation, and star shape, which is a general segmentation shape prior with minimal user assistance. Our improvements lie in volume ballooning, compactness measure and inclusion constraints. Volume ballooning is incorporated to help t...