...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International journal of remote sensing >Bare-earth extraction and DTM generation from photogrammetric point clouds including the use of an existing lower-resolution DTM
【24h】

Bare-earth extraction and DTM generation from photogrammetric point clouds including the use of an existing lower-resolution DTM

机译：从摄影测量点云中进行裸地球提取和DTM生成，包括使用现有的较低分辨率DTM

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A method of extracting bare-earth points from photogrammetric point clouds by partially using an existing lower resolution digital terrain model (DTM) is presented. The bare-earth points are extracted based on a threshold defined by local slope. The local slope is estimated from the lower resolution DTM. A gridded DTM is then interpolated from the extracted bare-earth points. Five different interpolation algorithms are implemented and evaluated to identify the most suitable interpolation method for such non-uniformly scattered data. The algorithm is tested on four test sites with varying topographic and ground cover characteristics. The results are evaluated against a reference DTM created using aerial laser scanning. The deviations of the extracted bare-earth points, and the interpolated DTM, from the reference DTM increases with increasing forest canopy density and terrain roughness. The DTM created by the method is significantly closer to the reference DTM than the lower resolution national DTM. The ANUDEM (Australian National University Digital Elevation Modelling) interpolation method is found to be the best performing interpolation method in terms of reducing the deviations and in terms of modelling the terrain realistically with minimum artefacts, although the differences among the interpolation methods are not considerably large.
机译：提出了一种通过部分使用现有的较低分辨率数字地形模型（DTM）从摄影测量点云中提取地球点的方法。基于由局部斜率定义的阈值来提取裸露点。根据较低分辨率的DTM估算局部斜率。然后从提取的裸露点内插栅格化DTM。实施并评估了五种不同的插值算法，以针对此类非均匀分散的数据确定最合适的插值方法。该算法在具有不同地形和地面覆盖特性的四个测试站点上进行了测试。根据使用航空激光扫描创建的参考DTM评估结果。随着森林冠层密度和地形粗糙度的增加，提取的地球点和插值DTM与参考DTM的偏差也会增加。与较低分辨率的国家DTM相比，通过该方法创建的DTM与参考DTM更加接近。从减少偏差和以最小的伪影实际地形化方面来看，ANUDEM（澳大利亚国立大学数字高程建模）插值方法被认为是性能最好的插值方法，尽管这些插值方法之间的差异并不大。

著录项

  • 来源
    《International journal of remote sensing》 |2016年第14期|3104-3124|共21页
  • 作者

    Debella-Gilo Misganu;

  • 作者单位

    Norwegian Inst Bioecon Res NIBIO, Mapping & Stat Div, Dept Geomat, POB 115, N-1431 As, Norway;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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