5 前景
目前的SAR变化检测算法大部分为中低分辨率、象元级、单极化的SAR影像变化检测。最近几年,SAR成像技术日益成熟,图像质量逐渐提高,分辨率不断增强,获取数据的能力和精度越来越高,图像获取越来越便捷。尤其是2007年,德国TerrraSAR-X和意大利Cosmo-SkyMed新型雷达系统的出现,引起了雷达遥感研究和应用的热潮。随着新型雷达系统的出现,SAR变化检测的前景会更加广阔:
1高空间分辨率使得SAR图像能够在较小的空间尺度上探测细节变化,实现对建筑物、道路等地面目标细微特征的探测。
2 多极化方式能够使得雷达图像的解译变得更为容易,实现在变化信息提取的基础上进一步确定变化类型。
3高空间分辨率影像的纹理结构更加清晰,纹理特征成为重要的识别信息,实现特征级变化检测。
因此,随着雷达技术的发展,SAR的变化检测研究将会实现高分辨率、特征级、多极化的变化检测,进而在军事侦查、探测,资源环境监测,土地利用与覆盖变化以及灾害评估与监测等方面起到越来越重要的作用。
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