DDA算法在地表面积计算中的应用研究  

Application Research on the DDA Algorithm for Calculating the Surface Area

作　　者：麻雪丽 巢佰崇[1,2] 王焰新 MA Xueli;CHAO Baichong;WANG Yanxinx(School of Geodesy and Geomatics*Wuhan University,Wuhan 430079,China;Key Laboratory of Precision Engineering and Industrial Measuring,Wuhan University,Wuhan 430079,China)

机构地区：[1]武汉大学测绘学院,湖北武汉430079 [2]武汉大学精密工程与工业测量重点实验室,湖北武汉430079

出　　处：《测绘地理信息》2019年第6期79-82,共4页Journal of Geomatics

基　　金：国家重点研发计划资助(2017YFC1405300)

摘　　要：现有的几种地表面积计算方法复杂,或欠缺考虑,或不便于在工程应用中使用。在实际应用的基础上,提出一种思路简单的地表面积计算新方法及步骤,该方法将栅格数据分成完整栅格和非完整栅格两部分。针对完整栅格,给出单元栅格划分方法及单元栅格地表面积计算理论;针对非完整栅格,详细介绍通过DDA(digital differential analyzer)算法及射线算法计算非完整栅格区域面积。该方法思路简单,并结合实际数据进行验证,取得了良好的效果。At present there are several methods for calculatingthe surface area.Those methodsare either complex or arelack of considering,or are not convenient for use in engineering. Based onthe practicalapplication,a new and simple method was proposed for calculating the surface area in this paper. The raster data was divided into two parts by the new method, one part is the complete grid and the other part is the incomplete grid. For the complete grid, a method was given for subdividing the unit grid and a theory was given for calculating its surface area.For the incomplete grid we calculate its surface area using DDA(Digital Differential Analyzer) algorithm and ray algorithm. This method is simple, which combined with the actual data to verify and obtain good results.

关 键 词：三维地形 数字高程模型 表面积计算 DDA算法 射线算法 

分 类 号：P218[天文地球—测绘科学与技术] P232