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首页> 外文期刊>International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences >AN OPTIMAL IMAGE SELECTION METHOD TO IMPROVE QUALITY OF RELATIVE RADIOMETRIC CALIBRATION FOR UAV MULTISPECTRAL IMAGES
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AN OPTIMAL IMAGE SELECTION METHOD TO IMPROVE QUALITY OF RELATIVE RADIOMETRIC CALIBRATION FOR UAV MULTISPECTRAL IMAGES

机译：改善UAV多光谱图像相对辐射校准质量的最佳图像选择方法

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摘要

Radiometric calibration has become important pre-processing with increasing use of unmanned aerial vehicle (UAV) images in various applications. In order to convert the digital number (DN) to reflectance, vicarious radiometric calibration is widely used including relative radiometric calibration. Some UAV sensor systems can measure irradiance for precise relative radiometric calibration. However, most of UAV sensor systems cannot measure irradiance and therefore precise relative radiometric calibration is needed to produce reflectance map with vicarious calibration. In this study, an optimal image selection method is proposed to improve quality of relative radiometric calibration. The method, relative calibration by the optimal path (RCOP), uses filtered tie points acquired in geometric calibration based on selection optimal image by Dijkstra algorithm. About 100 multispectral images were acquired with a RedEdge-M camera and a fixed-wing UAV. The reflectance map was produced using RCOP and vicarious calibration using ground reference panels. A validation data was processed using irradiance for precise relative radiometric calibration. As a result, the RCOP method showed root mean square error (RMSE) of 0.03–0.10 reflectance to validation data. Therefore, the proposed method can be used to produce precise reflectance map by vicarious calibration.
机译：辐射校准已成为在各种应用中不断使用无人机（UAV）图像的使用，这成为重要的预处理。为了将数字数（DN）转换为反射率，广泛使用的替代辐射校准包括相对辐射校准。一些UAV传感器系统可以测量精确相对辐射校准的辐照度。然而，大多数UAV传感器系统不能测量辐照度，因此需要精确的相对辐射校准来产生具有替代校准的反射率图。在该研究中，提出了一种最佳图像选择方法来提高相对辐射校准的质量。该方法，通过最佳路径（RCOP）相对校准，使用Dijkstra算法基于选择最佳图像在几何校准中获取的滤波点。使用Redge-M相机和固定翼UAV获取约100个多光谱图像。使用RCOP和使用地面参考面板使用RCOP和替代校准产生反射率。使用辐照度处理验证数据，以确切地相对放射线校准。结果，RCOP方法显示了对验证数据的0.03-0.10反射率的根均方误差（RMSE）。因此，所提出的方法可用于通过替代校准产生精确的反射率图。

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