Abstract
Abstract. High resolution satellite images are widely used to produce and update a digital map since they became widely available. It is well known that the accuracy of digital map produced from satellite images is decided largely by the accuracy of geometric modelling. However digital maps are made by a series of photogrammetric workflow. Therefore the accuracy of digital maps are also affected by the quality of satellite images, such as image interpretability. For satellite images, parameters such as Modulation Transfer Function(MTF), Signal to Noise Ratio(SNR) and Ground Sampling Distance(GSD) are used to present images quality. Our previous research stressed that such quality parameters may not represent the quality of image products such as digital maps and that parameters for image interpretability such as Ground Resolved Distance(GRD) and National Imagery Interpretability Rating Scale(NIIRS) need to be considered. In this study, we analyzed the effects of the image quality on accuracy of digital maps produced by satellite images. QuickBird, IKONOS and KOMPSAT-2 imagery were used to analyze as they have similar GSDs. We measured various image quality parameters mentioned above from these images. Then we produced digital maps from the images using a digital photogrammetric workstation. We analyzed the accuracy of the digital maps in terms of their location accuracy and their level of details. Then we compared the correlation between various image quality parameters and the accuracy of digital maps. The results of this study showed that GRD and NIIRS were more critical for map production then GSD, MTF or SNR.
Highlights
Digital map has to be periodically updated since the geographic information is changing rapidly and it constitutes national geographic information system
Previous researches investigated that high resolution satellite images can be substituted aerial photograph in cartographic purpose(Konecny and Schiewe, 1996; Fraser, 2002; Kay et al, 2003)
Digital maps are made by a series of photogrammetric workflow
Summary
Digital map has to be periodically updated since the geographic information is changing rapidly and it constitutes national geographic information system. Previous researches investigated that high resolution satellite images can be substituted aerial photograph in cartographic purpose(Konecny and Schiewe, 1996; Fraser, 2002; Kay et al, 2003). They considered the geometric accuracy of satellite image as a key factor to draw such a conclusion. The accuracy of digital maps are affected by the quality of satellite images, such as image interpretability. The accuracy of digital map according to GSD of satellite image was discussed. In this study, we will consider these parameters for analysis of the effects of image quality on digital map generation from satellite images. The result of experiments will be able to show critical parameters of image quality on digital map generation
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