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3D Processing of Gokturk-2 Imagery

机译：Gokturk-2影像的3D处理

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Gokturk-2 is the third Earth Observation (EO) satellite of Turkey. It was launched in 2012 and operates at its orbit of 685 km altitude from earth. It has a pushbroom scanner which acquires images from panchromatic (2.5 m). RGB (5 m) and near infrared (5 m) bands. Gokturk-2 also has along-track stereo imaging capability with the angles of ± 30°. Research and validation activities on Gokturk-2 images are so far somewhat limited in the literature. This study aims at validating Gokturk-2 stereo panchromatic (pan) images acquired in March 2015 and May 2017 over Bergama region near Izmir Province of Turkey. The validation mainly focuses on 3D point positioning accuracy and Digital Surface Model (DSM) generation potential from stereo pan images. The image orientation accuracy obtained using ground control points (gcp) and trajectory modelling using higher order polynomials is around 4 pixels for the 2015 stereopair and 2 pixels for the 2017 stereopair. Radiometric quality analysis has been performed prior to DSM generation. The DSMs generated from 2015 and 2017 images have been compared with reference airborne LiDAR data acquired in 2015 with a Riegl sensor. In addition, ground control objects extracted from the aerial images with 30 cm resolution, which were taken and processed by the Turkish General Directorate of Land Registry and Cadastre, have been used as supplementary information for the georeferencing of 2017 images. The results show that despite the accuracy problems in image orientation. DSMs can be generated with sufficient quality.
机译：Gokturk-2是土耳其的第三颗地球观测（EO）卫星。它于2012年发射升空，在距地球685公里的高空运行。它具有推扫式扫描仪，可从全色（2.5 m）采集图像。 RGB（5 m）和近红外（5 m）波段。 Gokturk-2还具有沿轨道的立体声成像功能，角度为±30°。迄今为止，对Gokturk-2图像的研究和验证活动在文献中还受到一定的限制。本研究旨在验证2015年3月和2017年5月在土耳其伊兹密尔省附近的贝尔加马地区采集的Gokturk-2立体全色（pan）图像。验证主要集中在3D点定位精度和从立体平移图像生成数字表面模型（DSM）的潜力上。使用地面控制点（gcp）和轨迹建模使用高阶多项式获得的图像方向精度在2015立体对中约为4像素，在2017立体对中约为2像素。在生成DSM之前已进行了辐射质量分析。将2015年和2017年图像生成的DSM与2015年使用Riegl传感器获取的参考机载LiDAR数据进行了比较。此外，由土耳其土地注册总局和地籍总局拍摄并处理的，以30厘米分辨率的航空影像中提取的地面控制对象已用作2017年影像地理参考的补充信息。结果表明，尽管图像定向存在精度问题。可以以足够的质量生成DSM。

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