亚米级宽幅卫星边缘视场影像的DSM生成研究

Production of DSM Based on Image Located at Edge of View of Sub Meter WFV Satellite

宽幅卫星影像常用于小侧摆角条件下拍摄制作大面积的正射影像成果,针对其具有大视场角的特点,提出了大视场角边缘视场结合小侧摆角构建立体像对制作DSM成果的方案。方案分析了宽幅卫星影像特点,选取边缘视场标准景分幅影像结合拍摄侧摆角构建卫星立体像对,阐述了数据处理技术流程。通过“吉林一号”宽幅系列卫星影像进行了DSM成果制作实验,并开展了不同太阳高度角条件下拍摄获取的影像制作的DSM成果纹理质量对比实验。实验结果表明,该方案可实现基高比大于0.5的立体条件,并获取高精度DSM成果,精度可满足1∶10000比例尺的DSM制图要求。此外,对比实验表明,太阳高度角越大,DSM成果纹理越清晰。

The Wide-Field-of-View(WFV)satellite imagery is introduced to produce large-area orthophoto images under the condition of small side roll angles.Aiming at its characteristics of wide field of view,a method of combining the edge field of wide field of view and small side roll angles to make stereo pairs and produce DSM is proposed.This method analyzes the characteristics of the WFV satellite image,selects the framed image of the standard scene of the edge field of view and combines the side roll angle to construct the satellite stereo image pair,and describes the data processing technical process.The DSM result production experiment is carried out through the“Jilin1”WFV satellite images,and the texture quality comparison test of the DSM results produced by the images captured under different sun altitude angles is compared.The experimental results show that the method can realize the stereo condition with the base-height ratio greater than 0.5,and obtain high-precision DSM results,and the accuracy can meet the requirements of DSM mapping with a scale of 1∶10000.The comparative experiments also show that the larger the sun altitude angle,the clearer the texture of DSM results.