地形因子流程化提取的模型描述与方法研究

Model description and method for procedural extraction of terrain factors

将工作流思想引入到地形因子的提取中,应用可扩展标记语言(extensible markup language,XML)对地形因子流程化提取过程进行建模描述与方法研究。通过对地形因子提取过程中数据流转关系和数据输入与输出、参数执行、因子模型与驱动执行的结构化组织与描述,形成一套适用于地形因子流程化提取的模型和建模方法。在基础地形因子提取算法的基础上,采用分辨率为5 m×5 m的数字高程模型(digital elevation model,DEM)数据,对实验区域的地形因子进行全自动流程化提取验证。同时,应用该模型对实验区域的河网进行提取,均取得了良好效果,表明该模型具有较强的普适性与可扩展性。

The workflow technology was tentatively applied to the terrain factor extraction. The authors chose the extensible markup language （ XML ） as modeling language to study and model the process of terrain factor extraction . A set of models and modeling methods suitable for terrain factor flow extraction was formed by structured organization and description of the relationship between data transfer, input data, output data, parameters, factor model and driven execution from terrain factor extraction. The model with 5 m × 5 m resolution based on traditional terrain factor algorithm automatically extracted terrain factor from DEM data of the experimental area, with good results achieved. At the same time, the river network extraction was conducted to test the terrain factor extraction model. The results show that the model has strong adaptability and scalability.