| 基于DEM数据的古沉积面的重建方法
——以青藏高原东北缘青海贵德盆地为例 |
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| 引用本文： | 高明星,刘少峰.基于DEM数据的古沉积面的重建方法
——以青藏高原东北缘青海贵德盆地为例[J].地质通报,2008,27(4):545-551. |
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| 作者姓名： | 高明星 刘少峰 |
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| 作者单位： | 中国地质大学地质过程与矿产资源国家重点实验室,北京,100083;中国地质大学岩石圈构造,深部过程及振测技术教育部重点实验室,北京,100083;中国地质大学(北京)地球科学与资源学院,北京,100083 |
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| 基金项目： | 国家自然科学基金
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中国地质调查局地质调查项目 |
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| 摘 要： | 广泛使用的数字高程模型（DEM）数据使得古沉积面的恢复成为可能。以青藏高原东北缘的青海贵德盆地为例，分析对比了前人获取代表古沉积面地表露头样本数据的几种方法．提出了插值样本应选择露头中代表原始沉积地层的顶面点的优选方法，并提取了更新统地表露头顶面点的样本数据。通过分析样本的特征、比较插值的结果，选择了自然邻点法进行插值预测，重建了贵德盆地更新统的古沉积面。正确样本，最的提取加上合适插值算法的选择．优化了重建的古沉积面。
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| 关 键 词： | DEM 古沉积面 空间插值 自然邻点法 样本数据 沉积地层 重建方法 青藏高原东北缘 青海贵德盆地 Guide basin case study based method of Qinghai Plateau 优化 的选择 插值算法 样本点 插值预测 点法 结果 比较 特征 |
A method of reconstructing the paleosurface based on EDM data-A case study of the Guide basin, Qinghai, China,on the northeastern margin of the Qinghai-Tibet Plateau |
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| GAO Ming-xing,LIU Shao-feng.A method of reconstructing the paleosurface based on EDM data-A case study of the Guide basin, Qinghai, China,on the northeastern margin of the Qinghai-Tibet Plateau[J].Geologcal Bulletin OF China,2008,27(4):545-551. |
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| Authors: | GAO Ming-xing LIU Shao-feng |
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| Abstract: | The extensively used digital elevation model (DEM) data make it possible to reconstruct the paleosurface. In this paper, take the Guide basin for example, several methods for extracting the data of surface exposure samples representing the paleosurface have been analyzed and compared. The authors propose an optimal method, i.e. the top point representing the original sedimentary strata in the outcrops should be selected as the interpolated sample. They extracted the sample data of the top of the Pleistocene surface outcrop. Based on an analysis of the sample characters and a comparison of the interpolated values, the natural neighbor interpolation has been adopted to reconstruct the Pleistocene paleosurface of the study area. The error of the reconstructed paleosurface has been decreased by using the proper interpolation to the properly selected samples. The extraction of correct sample points plus the selection of the proper interpolation have optimized the reconstruction of the paleosurface. |
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| Keywords: | DEM paleosurface spatial interpolation natural neighbor interpolation |
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