...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Remote Sensing of Environment: An Interdisciplinary Journal >Artefact detection in global digital elevation models (DEMs): The Maximum Slope Approach and its application for complete screening of the SRTM v4.1 and MERIT DEMs
【24h】

Artefact detection in global digital elevation models (DEMs): The Maximum Slope Approach and its application for complete screening of the SRTM v4.1 and MERIT DEMs

机译：全球数字高度模型中的人工制品检测（DEMS）：最大坡度方法及其完整筛选SRTM v4.1的应用和优点DEM

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Despite post-processing efforts by space agencies and research institutions, contemporary global digital elevation models (DEMs) may contain artefacts, i.e., erroneous features that do not exist in the actual terrain, such as spikes, holes and line errors. The goal of the present paper is to illuminate the artefact issue of current global DEM data sets that might be an obstacle for any geoscience study using terrain information. We introduce the Maximum Slope Approach (MSA) as a technique that uses terrain slopes as indicator to detect and localize spurious artefacts. The MSA relies on the strong sensitivity of terrain slopes for sudden steps in the DEM that is a direct feature of larger artefacts. In a numerical case study, the MSA is applied for globally complete screening of two SRTM-based 3 arc-second DEMs, the SRTM v4.1 and the MERIT-DEM. Based on 0.1 degrees x 0.1 degrees sub-divisions and a 5 m/m slope threshold, 1341 artefacts were detected in SRTM v4.1 vs. 108 in MERIT. Most artefacts spatially correlate with SRTM voids (and thus with the void-filling) and not with the SRTM-measured elevations. The strong contrast in artefact frequency (factor similar to 12) is attributed to the SRTM v4.1 hole filling. Our study shows that over parts of the Himalaya Mountains the SRTM v4.1 data set is contaminated by step artefacts where the use of this DEM cannot be recommended. Some caution should be exercised, e.g., over parts of the Andes and Rocky Mountains. The same holds true for derived global products that depend on SRTM v4.1, such as gravity maps. Primarily over the major mountain ranges, the MERIT model contains artefacts, too, but in smaller numbers. As a conclusion, globally complete artefact screening is recommended prior to the public release of any DEM data set. However, such a quality check should also be considered by users before using DEM data. MSA-based artefact screening is not only limited to DEMs, but can be applied as quality assurance measure to ot
机译：尽管空间机构和研究机构进行后期处理努力，但当代的全球数字高度模型（DEM）可能包含人工制品，即实际地形中不存在的错误功能，例如尖峰，孔和线路错误。本文的目标是照亮当前全球DEM数据集的人工制品问题，这可能是使用地形信息的任何地球科学研究的障碍。我们将最大斜率方法（MSA）介绍为使用地形斜率作为指示器检测和定位杂散人工制品的技术。 MSA依赖于地形斜坡的强烈敏感性，以便突然步骤中的突然步骤，这是较大人工制品的直接特征。在一个数字案例研究中，MSA适用于全局完整的两个基于SRTM的3个ARP-第二DEM，SRTM V4.1和MERIT-DEM的筛选。基于0.1度×0.1度的子分割和5米/ m斜率阈值，在优选SRTM V4.1与108中检测到1341个人工制品。大多数人工制品与SRTM空隙（因此，具有空隙填充）而不是使用SRTM测量的升高。文物频率的强对比度（类似于12的因子）归因于SRTM V4.1孔填充物。我们的研究表明，在喜马拉雅山脉的部分地区，SRTM V4.1数据集被逐步污染，其中不推荐使用该DEM。应谨慎行使，例如，在安第斯山岩和落基山脉的部分地区。衍生的全球产品相同的是依赖于SRTM v4.1，例如重力图。主要在主要的山脉范围内，优异模型也包含人工制品，但较少的数字。作为结论，在公开发布任何DEM数据集之前建议全局完成的人工制品筛查。但是，在使用DEM数据之前，也应考虑这样的质量检查。基于MSA的人工制品筛查不仅限于DEM，而且可以应用于ET的质量保证措施

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号