期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2006
卷号：XXXVI Part 4
出版社：Copernicus Publications
摘要：Post-launch performance analysis carried out to characterize spatial and radiometric aspects of IRS-CARTOSAT-1 is reported in this paper. The radiometric characteristics are estimated with scene dynamic range analysis, signal-to-noise ratio, impact of onboard data compression on image quality, and the spatial characteristics is by modulation transfer function (MTF). Histograms of about 42 scenes comprising of different land-cover features across the country were computed to estimate overall and most significant dynamic ranges of the sensor output. Similarly, the signal-to-noise ratios were estimated by visually selecting uniform target areas viz., water body, tar-road and snow to study the sensor radiometry at low, middle and high input signal levels. Also, the effect of JPEG data compression onboard (Compression Ratio = 1:3.2) on the data quality was studied by analyzing the satellite data over the same area with compression off- and on-modes of data acquisition. The MTF was estimated base on slant-edge algorithm, which allows to extract edge information at sub- pixel level for accurate estimation of the edge profile. The MTF was evaluated using the slant edge algorithm on an image edge over an airstrip target. It was found that the sensors onboard CARTOSAT-1 spacecraft has met all the mission set specifications, and would help to generate data products with adequate image sharpness, radiometric quality and insignificant image distortion due to onboard compression scheme to extract cartographic feature extraction and analysis
关键词：Signal-to-noise ratio; Modulation transfer function; Point Spread Function; Scene dynamic range; JPEG compression
