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| 基于小波多尺度分析的DEM数据综合及尺度转换 | |
| 引用本文： | 于浩,杨勤科,张晓萍,何浩.基于小波多尺度分析的DEM数据综合及尺度转换[J].地理与地理信息科学,2009,25(4). |
| 作者姓名： | 于浩 杨勤科 张晓萍 何浩 |
| 作者单位： | 1. 新疆维吾尔自治区地质矿产勘查开发局信息中心,新疆,乌鲁木齐,830000 2. 中国科学院水利部水土保持研究所,陕西,杨凌,712100 3. 新疆大学建筑工程学院,新疆,乌鲁木齐,830008 |
| 基金项目： | 国家重点基础研究发展计划(2007CB407203) |
| 摘 要： | DEM综合是其描述的地形表面细节逐渐舍去、轮廓不断呈现的连续过程。该文运用小波变换和方根模型模拟这一过程,将小波高频系数作为DEM综合的对象,以方根模型作为阈值设定的理论依据,对小波分解各层按不同等级进行取舍实现DEM综合。以1∶1万地形图建立的DEM进行试验,派生一系列不同复杂度的DEM,并用等高线分布特征、坡度和剖面曲率、地形叠加等进行对比分析。结果表明,随着DEM综合程度增大,生成的DEM逐步舍去地形表面细节,同时较好保持了原DEM山体轮廓、山脊和谷地的走向等地貌形态特征。最后,运用回归分析方法建立了派生DEM与相应空间分辨率之间的关系,为DEM尺度效应的应用提供方法和数据支持。 |
| 关 键 词： | 数字高程模型 小波 方根模型 坡度 剖面曲率 |
A Study of DEM Generalization Based on Wavelet Analysis and It Scale Transformation |
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| YU Hao,YANG Qin-ke,ZHANG Xiao-ping,HE Hao.A Study of DEM Generalization Based on Wavelet Analysis and It Scale Transformation[J].Geography and Geo-Information Science,2009,25(4). | |
| Authors: | YU Hao YANG Qin-ke ZHANG Xiao-ping HE Hao |
| Institution: | 1.The Information Center of Geology and Mineral Resource Exploitation and Development of Xinjiang;Urumchi 830000;2.Institute of Soil and Water Conservation;Chinese Academy of Sciences;Yangling 712100;3.College of Architecture;Xinjiang University;Urumchi 830008;China |
| Abstract: | The generalization of Digital Elevation Model(DEM)is a continuous process of topographic surface detail being erased.The multi-band wavelet analysis and square root model are used to simulate the process and realize the generating of DEM on the basis of different grades of wavelet analysis.The DEM with scale of 1 ∶ 10 000 was experimented.The results show that the landform surface detail is erased step-by-step,it also reserved the characteristics of original outline and valley trend of the mountain when the generalization of DEM is increased.Finally,the regression analysis method was used to built the relation between DEM and the space resolution,it provided method and data for the further research and application of the model. |
| Keywords: | Digital Elevation Model(DEM) wavelet square root model slope profile curvature |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |