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OALib Journal期刊
ISSN: 2333-9721
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栅格dem中隔断线约束算法应用评价
DOI: 10.3969/j.issn.1000-2006.2014.01.025, PP. 140-144
Keywords: 隔断线,数字高程模型,规则格网,不规则三角网,拟合精度
Abstract:
基于高精度差分gps测量数据,在详细分析规则格网数字高程模型(dem)构建过程中隔断线算法过程基础上,构建带约束算法的大比例尺沟道侵蚀形态的规则格网dem,并将其与非带约束条件的规则格网dem和实测值进行了对比。研究发现:带约束条件下的规则格网dem能够很好地与实际形态相符合,并优于依据同样点所构建不规则三角网(tin)转换而来的同等分辨率的规则格网dem,而且研究发现随着格网间距的减小,插值结果与实测值间的rmse也随之减小,规则格网dem对地形的表现能力渐趋增强。
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