THREE-DIMENSIONAL EARTH MODELLING PERFORMANCE ANALYSIS OF GOKTURK-2 SATELLITE

Year 2020, Volume: 4 Issue: 3, 164 - 168, 01.07.2020

Aycan Murat Marangoz , Umut Güneş Sefercik Damla Yüce

https://doi.org/10.31127/tuje.650989

Abstract

Following RASAT, Göktürk-2, placed into its orbit as Turkey’s second domestic production of earth observation, has three times higher spatial resolution (2.5 m) than RASAT and has much more advanced stereo vision capability. However, like all-optical imaging satellites, Göktürk-2 has problems in data quality due to reasons such as sensor geometry, contrast, dense forest cover in the field of view and topographic slope. In this study, it is aimed to evaluate the horizontal and vertical geolocation accuracy performance of three-dimensional Digital Surface Models (DSM) derived from Göktürk-2 stereo images in comparison with a reference DSM obtained by traditional photogrammetry method in Derik district of Mardin province with high slope and variable topographic conditions. The results demonstrated that the three dimensional topographic representation capability of Göktürk-2 is quite successful despite offering a medium spatial resolution. The Göktürk-2 DSM has an absolute horizontal geolocation accuracy of ≤0.1 pixels (25 cm) both for X and Y directions. On the height, it provides accuracy as standard deviation of 7.3 m and normalized median absolute deviation of about 5.7 m. 

Keywords

Göktürk-2, Digital Surface Model, Performance, Quality

Supporting Institution

Air Force Command Intelligence Department and MAS Aviation Solutions Inc.

Thanks

We would like to express our gratitude to the Air Force Command Intelligence Department and all its military personnel who assisted in obtaining the Göktürk-2 stereo satellite images used in the study and to all MAS Aviation Solutions Inc. personnel who also assisted in obtaining the photogrammetric DSM with the aerial photographs used in the study.

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