HJ-1A高光谱影像的表层土壤游离氧化铁含量反演  

Inversion of free ferric oxide content in surface soil based on HJ-1A hyperspectral images

作　　者：马驰[1] Ma Chi(Liaoning Provincial College of Communications,Shenyang 110122,China)

机构地区：[1]辽宁省交通高等专科学校,沈阳110122

出　　处：《农业工程学报》2020年第20期164-170,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(41371332);中国地质调查局项目(1212010911084);辽宁省交通高等专科学校项目(lnccybky201910)。

摘　　要：实时监测土壤游离氧化铁含量对于获取区域土壤理化特征数据、监测区域土壤环境具有重要意义。该研究基于HJ-1A高光谱遥感影像,结合研究区土壤采样的游离氧化铁含量化验数据,分析遥感影像的反射率与土壤游离氧化铁含量的相关性,建立土壤游离氧化铁含量的多元线性反演模型,反演研究区表层土壤游离氧化铁含量。研究结果表明,HJ-1A高光谱遥感影像的反射率与研究区土壤游离氧化铁含量呈负相关性,且在第104波段达到峰值,相关系数为-0.455;利用反射率指数变换建立多元一次回归模型,模型的决定系数为0.837,均方根误差为1.59 g/kg;土壤中有机质对游离氧化铁含量反演精度影响的检验结果显示,研究区土壤的有机质对游离氧化铁含量的反演精度无显著影响。该研究为土壤游离氧化铁的光谱分析提供借鉴,为区域土壤生态环境监测提供数据支持。The real-time monitoring of soil free ferric oxide content is very important for obtaining regional soil physical and chemical characteristics data,monitoring soil environment,and implementing regional precision agriculture.It took HJ-1A hyperspectral remote sensing image as the basis to establish an inversion model of free ferric oxide contents in surface soil of Nong'an county,which also had combined with test data obtained from soil sampling in the study area.The whole process was divided into three steps:first of all,soil samples were taken in the research area from April 29th to April 30th,2017,and 82 soil samples were collected.At the same time,the longitude and latitude of the sampling points were measured by hand-held GPS receivers to determine the position of the sampling points in remote sensing images,and the free ferric oxide content of the soil samples was tested in the laboratory.Moreover,the HJ-1A hyperspectral remote sensing image covering the study area,which was synchronized with the soil sampling time,was selected,and the FLAASH atmospheric correction model was used to carry out an atmospheric correction on the remote sensing image to eliminate the influence of water vapor,ozone,dust and the like on the imaging process in the imaging process of the sensor.Erdas software was used to carry out a geometric precise correction on the remote sensing image,and the corrected error was less than 1 pixel.Erdas software was used to draw the boundary of the research area,and the remote sensing image was cut and spliced;Finally,the reflectivity was subjected to the mathematical transformation such as reciprocal,logarithmic,exponential,power function,reciprocal of the logarithm,first-order differential of reflectivity,first-order differential of reciprocal,first-order differential of logarithmic,first-order differential of exponential,first-order differential of logarithmic reciprocal,etc.The correlation analysis between the reflectance and its mathematical transformation data and the content of soil free fe

关 键 词：遥感 高光谱 铁 定量反演 游离氧化铁 HJ-1A HSI 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置] S151.9[自动化与计算机技术—控制科学与工程]