Authors : Zsolt Varga, Herta Czedli, Csaba Kezi, Jozsef Loki, Akos Fekete and Janos Biro
Abstract: Improvement and constant change in science, technology and innovation in our modern life demands knowledge of a variety of geo-information applications, thus tools of data processing, display, analysis and simulation while fulfilling an interdisciplinary role, promote decision making and analytic procedures of engineering, ecological and marketing tasks. Aerial and satellite images have been used worldwide for the purpose of conducting various projects (studies of changes in land cover, classification, defining land usage) with photos serving mostly as starting points, a basis for our analyses. Assuming that different aerial and satellite images shall yield data of varying accuracy, subject to the scale and resolution of the photos as well as the type of depicted cartographic units, it is essential to have advance knowledge of expected accuracy of the photos to be used before the evaluation is performed. The aim of our analysis was to determine the difference between the vector files obtained from digitized orthophotos and those obtained by using geodesic measurements; we examined whether accuracy was subject to varying resolutions of orthophotos or satellite images. We have analyzed aerial photos and satellite images of two chosen test sites by comparing points and lines obtained by landscape measurements with those digitalized from orthophotos. By using statistical methods we defined the expected accuracy (resolutions used were 0.4 and 0.65 m/pixel) of road centerlines digitized from photos. Our study wants to emphasize that the assessments we apply may be utilized for planning and research work and the resulting data may effectively be used for road line planning as well as determining road segments and public utility crossings.
Zsolt Varga, Herta Czedli, Csaba Kezi, Jozsef Loki, Akos Fekete and Janos Biro, 2015. Evaluating the Accuracy of Orthophotos and Satellite Images in the Context of Road Centerlines in Test Sites in Hungary. Research Journal of Applied Sciences, 10: 568-573.