基于资源三号多光谱影像的云顶高度估计  

Cloud Height Estimation of ZY-3 Multispectral Images

作　　者：姜丙波 潘红播[1] 柳忠伟 马慧云[1] 詹国旗 IANG Bingbo;PAN Hongbo;LIU Zhongwei;MA Huiyun;ZHAN Guoqi(Department of Surveying and Geo-informatics,Central South University,Changsha 410083,China;PowerChina ZhongNan Engineering Corporation Limited,Changsha 410014,China)

机构地区：[1]中南大学地球科学与信息物理学院,长沙410083 [2]中国电建集团中南勘测设计研究院有限公司,长沙410014

出　　处：《遥感信息》2023年第2期18-25,共8页Remote Sensing Information

摘　　要：通常来说,云对于高分辨率光学卫星影像来说是一种无效区域,需要避免成像并消除。然而,对于气象分析来说,云顶高度的估计在大气运动和天气预报等领域都具有十分重要的意义。基于资源三号测绘卫星多光谱影像波段之间的视差,文章提出了一种高精度云顶高度的估计方法。在严格分析云顶高度估计的误差因素即内方位元素误差、外方位元素误差、匹配误差、云移动、DEM误差等影响的基础上,提出了相应的优化与补偿方法。由于内方位元素误差对每列影像的影响相同,提出了基于无云区域估计内方位元素误差的方法;鉴于每行影像的外方位元素误差相同,提出了基于无云区域估计外方位元素误差的方法;考虑到多光谱波段之间相近的成像几何,通过相位相关的方法获取高精度的视差;在假设云静止的条件下,云顶高度估计的理论精度为96 m。通过阿兹劳和乌兹别克斯坦两个地区的多光谱影像进行实验,验证该方法的可行性。该方法还可进一步应用于云的检测。Generally speaking,the cloud for high-resolution optical satellite images is an ineffective region,which needs to avoid imaging and eliminate the irrelevant feature.However,in the fields of weather analysis,the estimated top height in the atmosphere and weather sports and other fields has great significance.Due to parallax between multi-spectral image bands of ZY-3 mapping satellite,a high-precision estimation method is presented.Based on a rigorous analysis of error factors in cloud-top height estimation,which are elements of interior orientation error,elements of exterior orientation error,image pair matching error,the error caused by clouds moving,DEM error and so on,this paper presents the corresponding solution to minimize,optimize or compensate the errors above.Owing to the same impact that is brought by interior orientation elements errors on each column of the image,the method of estimating interior orientation elements error is proposed,which is based on a cloudless region within the estimation error of interior orientation elements;and according to exterior orientation elements error have the same impact on each row of the image,the method of exterior orientation element error estimation is proposed which is based on cloud-free region;taking multi-spectral bands have the similar imaging geometry into account,the phase correlation method is an appropriate way to obtain highly accurate parallax between the multi-spectral bands that is caused by the terrain relief;under the assumption that the cloud is in quiescent conditions,the cloud-top height estimation owns theoretical accuracy of 96 meters.Through the experiment on multi-spectral mage bands of ZY-3 mapping satellite containing Azlau and Uzbekistan,it has verified the feasibility of the method proposed by this article.What is more,the method may further be applied to the detection or recognition of cloud.

关 键 词：误差分析 云顶高度 波段配准 资源三号 多光谱影像 

分 类 号：P407.8[天文地球—大气科学及气象学]