GF-5卫星高光谱影像数据质量评价与分析

目前遥感影像质量评价的指标与方法虽较为成熟,但尚未发现针对高分五号(GF-5)卫星AHSI影像数据质量评价及其可用性的全面研究。该文在分析高光谱影像质量评价方法的基础上,利用噪声标准差、清晰度和信息熵3个指标,对GF-5可见短波红外谱段的数据质量与可用性进行分析评价,结果表明:GF-5AHSI影像不同波段数据质量存在差异,影像信息主要集中在VNIR和SWIR第1-95波段内(受水汽影响的波段除外),SWIR中第43-50、96-112(1359.03~1418.17nm、1805.44~1940.15nm)共25个波段受水汽影响严重,不可用,第113-180(1948.57~2513.25nm)波段影像质量较差、噪声严重,阻碍了该波段的应用。研究结果可为GF-5AH-SI影像数据的处理与应用提供技术参考。

Quality Evaluation and Analysis of GF-5 Hyperspectral Image Data

Although the indexes and methods of remote sensing image quality evaluation are mature,there is no comprehensive research on the image quality and availability of the visible-shortwave infrared advanced hyperspectral imager(AHSI)of GF-5.Based on the analysis of hyperspectral image quality evaluation methods,this paper analyzes and evaluates the data quality and usability of GF-5 visible-shortwave infrared spectrum using three indicators:noise standard deviation,definition and information entropy.The results show that there are differences in the data quality of different bands of GF-5 AHSI images.AHSI image information is mainly concentrated in VNIR and SWIR 1-95(except for those affected by water vapor);a total of 25 bands in SWIR,43-50(1359.03~1418.17 nm),96-112(1805.44~1940.15 nm)are seriously affected by water vapor and are not available;SWIR 113-180(1948.57~2513.25 nm)have poor image quality and serious noise,which hinders the application of these bands.The results of the study can provide technical reference for the processing and application of AHSI image data of GF-5.