ACCURACY ASSESSMENT OF GÖKTÜRK-1 SATELLITE IMAGERY

Abstract

Optical satellite imagery has an important place today in terms of responding to the increasing need for geospatial base in many different fields and disciplines, especially because of their availability and temporal resolution. Because all kinds of geospatial information and data production processes such as orthoimages, maps, vector data and etc. in especially for large project areas provide the opportunity to reduce the cost and time required in the field work, so the interest in high resolution satellite imagery. Gokturk-1, an electro-optical satellite that was launched on December 5, 2016 and acquiring 0.50 m spatial resolution imagery, aims to meet the high resolution image requirements of Turkey. In this study, the horizontal and vertical accuracy of the Digital Surface Model and orthoimages produced by different methods from stereo images obtained from Gokturk-1 satellite in two different regions were investigated. As a result,  although the pointing accuracy and the Digital Surface Model accuracy produced from Gokturk-1 satellite imagery, will vary according to the incidence angle of Gokturk-1 satellite, the Digital Terrain Model used in the production of the orthoimage, the selected method for orientation of satellite imagery; a planimetric accuracy of better than ± 2 m RMSE in  orthoimage and a height accuracy of better than ± 3 m RMSE is accomplished.