Lake is an important part of the natural ecosystem, and its morphological characteristics reflect the capacity of lake regulation and storage, the strength of material migration, and the characteristics of shoreline d...Lake is an important part of the natural ecosystem, and its morphological characteristics reflect the capacity of lake regulation and storage, the strength of material migration, and the characteristics of shoreline development. In most existing studies, remote sensing images are used to quantify the morphological characteristics of lakes. However, the extraction accuracy of lake water is greatly affected by cloud cover and vegetation cover, and the inversion accuracy of lake elevation data is poor, which cannot accurately describe the response relationship of lake landscape morphology with water level change. Therefore, this paper takes Tonle Sap Lake as the research object, which is the largest natural freshwater lake in Southeast Asia. DEM is constructed based on high-resolution measured topographic data, and morphological indicators such as lake area, lake shoreline length, perimeter area ratio, longest axis length, maximum width, shoreline development index, lake shape complexity, compactness ratio and form ratio are adopted to researching the evolution law of high water overflows and low water outbursts quantitatively, and clarifying the variation characteristics of landscape morphology with water level gradient in Tonle Sap Lake. The research results have important theoretical significance for the scientific utilization of Tonle Sap Lake water resources and the protection of the lake ecosystem.展开更多
为有效解决SAP(System Applications and Products)项目中存在的数据异构问题,满足用户对数据转换的准确性和高效性的要求,基于Java语言设计一种SAP通用数据转换平台。通过分析开展SAP项目过程中遇到的数据量庞大、数据的颗粒度不统一...为有效解决SAP(System Applications and Products)项目中存在的数据异构问题,满足用户对数据转换的准确性和高效性的要求,基于Java语言设计一种SAP通用数据转换平台。通过分析开展SAP项目过程中遇到的数据量庞大、数据的颗粒度不统一和系统的操作性较差等问题,阐述数据转换平台的设计需求,在此基础上分析该平台的总体框架、设计思路、数据处理模型和重要功能。实际应用结果表明,该平台能在满足数据字段准确性要求的同时,兼顾数据处理的效率,且具有良好的可操作性、实用性和可推广性,能为同类型项目中海量数据的高效、快速转换提供参考。展开更多
文摘Lake is an important part of the natural ecosystem, and its morphological characteristics reflect the capacity of lake regulation and storage, the strength of material migration, and the characteristics of shoreline development. In most existing studies, remote sensing images are used to quantify the morphological characteristics of lakes. However, the extraction accuracy of lake water is greatly affected by cloud cover and vegetation cover, and the inversion accuracy of lake elevation data is poor, which cannot accurately describe the response relationship of lake landscape morphology with water level change. Therefore, this paper takes Tonle Sap Lake as the research object, which is the largest natural freshwater lake in Southeast Asia. DEM is constructed based on high-resolution measured topographic data, and morphological indicators such as lake area, lake shoreline length, perimeter area ratio, longest axis length, maximum width, shoreline development index, lake shape complexity, compactness ratio and form ratio are adopted to researching the evolution law of high water overflows and low water outbursts quantitatively, and clarifying the variation characteristics of landscape morphology with water level gradient in Tonle Sap Lake. The research results have important theoretical significance for the scientific utilization of Tonle Sap Lake water resources and the protection of the lake ecosystem.
文摘为有效解决SAP(System Applications and Products)项目中存在的数据异构问题,满足用户对数据转换的准确性和高效性的要求,基于Java语言设计一种SAP通用数据转换平台。通过分析开展SAP项目过程中遇到的数据量庞大、数据的颗粒度不统一和系统的操作性较差等问题,阐述数据转换平台的设计需求,在此基础上分析该平台的总体框架、设计思路、数据处理模型和重要功能。实际应用结果表明,该平台能在满足数据字段准确性要求的同时,兼顾数据处理的效率,且具有良好的可操作性、实用性和可推广性,能为同类型项目中海量数据的高效、快速转换提供参考。
