Estimation of the Image Interpretability of ZY-3 Sensor Corrected Panchromatic Nadir Data
Estimation of the Image Interpretability of ZY-3 Sensor Corrected Panchromatic Nadir Data
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DOI：
10.3390/rs6054409
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发表时间：
2014-05
期刊：
影响因子：
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通讯作者：
Lin Li;Heng Luo;Haihong Zhu
中科院分区：
文献类型：
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作者：
Lin Li;Heng Luo;Haihong Zhu
图像质量对于充分利用卫星数据非常重要。国家图像可解释性量表(NIIRS)作为一种常用指标，被广泛用于图像质量评价，从可解释性的角度对图像质量进行了全面的表征。ZY-3(资源三号)卫星是2012年建立的中国第一颗民用高分辨率测绘卫星。到目前为止，还没有关于采用NIIRS作为评估该卫星图像数据质量的共同指标的报告。由于缺乏一个共同的质量指标，导致世界各地的卫星数据用户与中国的用户对ZY-3数据的质量和可用性的了解存在差距。为了克服这一差距，使用通用图像质量方程(GIQE)，本研究根据NIIRS对ZY-3传感器校正(SC)全色最低点(NAD)数据进行了评估。为了解决GIQE中ZY-3数据(2.1m)超出地面样本距离(GSD)(小于2.03m)所带来的不确定性，利用8幅图像建立了人工获取的NIIRS与GIQE预测的NIIRS之间的关系。调整后的GIQE是基于这种关系，并通过另外五张图像进行验证。我们的研究表明，用调整后的GIQE计算NIIRS的方法可以用于ZY-3卫星图像的质量评估，并表明ZY-3 SC NAD数据的NIIRS值约为2.79。
Image quality is important for taking full advantage of satellite data. As a common indicator, the National Imagery Interpretability Scale (NIIRS) is widely used for image quality assessment and provides a comprehensive representation of image quality from the perspective of interpretability. The ZY-3 (Ziyuan-3) satellite is the first civil high resolution mapping satellite in China, which was established in 2012. So far, there has been no reports on adopting NIIRS as the common indicator for the quality assessment of that satellite image data. This lack of a common quality indicator results in a gap between satellite data users around the world and those in China regarding the understanding of the quality and usability of ZY-3 data. To overcome the gap, using the general image-quality equation (GIQE), this study evaluates the ZY-3 sensor-corrected (SC) panchromatic nadir (NAD) data in terms of the NIIRS. In order to solve the uncertainty resulting from the exceeding of the ground sample distance (GSD) of ZY-3 data (2.1 m) in GIQE (less than 2.03 m), eight images are used to establish the relationship between the manually obtained NIIRS and the GIQE predicted NIIRS. An adjusted GIQE is based on the relationship and verified by another five images. Our study demonstrates that the method of using adjusted GIQE for calculating NIIRS can be used for the quality assessment of ZY-3 satellite images and reveals that the NIIRS value of ZY-3 SC NAD data is about 2.79.