基于CFAR的RADARSAT-1南极裸岩目标信息提取

Rock Outcrop Detection from RADARSAT-1 Datasets Based on Constant False Alarm

  • 摘要: 裸岩分布信息是获取南极冰厚0等值线的重要方法和手段,同时也是极地遥感地面验证的重要数据,因而自动提取南极裸岩信息具有重要的研究意义。采用对岩石和冰川具有较好对比度的RADARSAT-1南极区域合成孔径雷达数据,基于恒虚警率(CFAR)的方法,实现了南极裸岩目标信息的自动化提取。该方法的研究以四种杂波分布模型为前提,从而分析不同分布模型的抗噪性能,并通过卡方检验准则验证了四种方法的有效性;在典型的实验样区上比较不同CFAR方法的裸岩检测性能,最终选定最优参数用于南极洲裸岩信息的自动检测。两组实验结果表明,采用CFAR结合Weibull分布的方法,南极山脉的裸岩提取精度可达80%以上并将错检率控制在8%以下,能够较为精确地提取裸岩信息。

     

    Abstract: Microwave data has become the leading dataset in polar remote sensing research. In this paper, based on the CFAR algorithm, rock outcrop information is extracted from RADARSAT-1 synthetic aperture radar datasets, which yields high resolution imagery with good contrast between rock outcroppings and glacier ice. In order to choose the suitable parameters for the mountain range rock outcrop information extraction, evaluation of the effectiveness different models was conducted on representative datasets. In experiments, the results of Weibull distribution based SO-CFAR method demonstrate that the accuracy of rock outcrops detection ratio was larger than 80% and the overall error ratio was less than 8%, which verifies that the proposed method has a great potential for analyzing the rock outcroppings in the Antarctic.

     

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