一种分形模型的机载InSAR DEM空洞填补方法

发布时间：2018-06-26 11:32

  本文选题：机载InSAR + DEM　； 参考：《测绘科学》2017年06期

【摘要】：针对如何提高机载InSAR DEM空洞填补精度和DEM对地形细节描述的难题,该文对分形模拟的中点位移插值函数做了改进。首先,提出了动态分形参数提取思路,根据选定的窗口动态提取局部分形参数,使提取的分形参数局部精度显著提高。其次,提出了分形曲面中心内插法,以正方形为图像基元,将两点信息扩展到8点信息来充分显示局部变化的细节信息;考虑到对采样点点数和位置的要求,结合距离加权平均法来弥补周围不够8点的特殊情况。最后,以国产机载X波段全极化InSAR影像提取的DEM为数据源进行了实验。实验结果表明,相比传统的中点分形内插法,该方法不仅能有效提高空洞填补精度,且能更好地描述地形的细节信息。
[Abstract]:In order to improve the accuracy of filling holes in airborne InSAR Dem and the difficulties of Dem in describing terrain details, the mid-point displacement interpolation function of fractal simulation is improved in this paper. Firstly, the idea of dynamic fractal parameter extraction is put forward, and the local fractal parameter is extracted dynamically according to the selected window. The local precision of the extracted fractal parameter is improved significantly. Secondly, a fractal surface center interpolation method is proposed, in which the square is taken as the image primitive, and the two points information is extended to 8 points to fully display the local variation details, and the requirements for the number and position of the sampling points are taken into account. The distance weighted average method is used to compensate for the special case of less than 8 points in the surrounding area. Finally, Dem extracted from domestic airborne X-band fully polarized InSAR images is used as data source. The experimental results show that compared with the traditional midpoint fractal interpolation method, the proposed method can not only improve the accuracy of cavity filling, but also better describe the detailed information of terrain.
【作者单位】： 中国测绘科学研究院;中南大学地球科学与信息物理学院;
【分类号】：P208;P237
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本文编号：2070251