遥感影像不同校正模型对反射率的影响分析  

Influence Analysis of Different Geometric Rectification for Surface Reflectance of Remote Sensing Images

作　　者：闫长位 贾智乐 许强 YAN Changwei

机构地区：[1]河南省沙颍河流域管理局,河南漯河462000 [2]河南省水利勘测有限公司,河南郑州450003

出　　处：《地理空间信息》2021年第10期80-82,I0002,共4页Geospatial Information

基　　金：河南省2020年度水利科技攻关项目(GG202001,GG202010)。

摘　　要：采用飞马D200四旋翼无人机携带多光谱相机,获取了可见光波段的数据,地面同步测量了地表反射率和大气参数。结合实验数据,采用基于POS数据的严格成像模型和多项式模型对图像进行了几何校正,对比了2种模型的校正精度和不同重采样方式产生的差异。在几何校正的基础上进行了大气校正,获得地表反射率,选取典型地物水体、植被、裸土的实测结果进行验证。结果表明低空无人机遥感可以得到精度较高的地表反射率结果,但不同的几何校正模型对地表反射率影响较小,可以忽略。通过开展该实验证明了利用无人机开展定量化遥感研究的可行性。By virtue of characteristics of flexibility,high resolution,flying below the clouds,UAV remote sensing has been widely used in environmental monitoring,disaster and scenes of accidents.Most of the UAVs applications,however,are based on UAV photogrammetry and tend to image interpretation.We carried out the integrated remote sensing experiments in Zhengzhou,and used Feima fourrotor UAV equipped with multispectral camera to obtain visible band data,and measured surface reflectance and atmospheric parameters simultaneously.Then,we compared the corrected accuracy with resampling differences of strict imaging model based on POS data and polynomial model.On the basis of geometric correction,we carried out atmospheric correction to obtain the surface reflectance,and selected the measured results of water body,vegetation and bare soil for verification.The results show that it is feasible for UAV quantitative research,and the geometric correction model is mainly related to the positioning accuracy,has little effect on the reflectivity inversion.

关 键 词：无人机 几何校正模型 辐射校正 反射率反演 

分 类 号：P237[天文地球—摄影测量与遥感]