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In recent years, interferometric sytnthetic aperture radar (InSAR) is one of the most preferred techniques to generate digital surfacemodels (DSM) which are the three dimensional (3D) digital cartographic representations of earth surface including all terrain andnon-terrain formations. Interferometric DSM generation using synthetic aperture radar (SAR) imagery is not an easy process and thevertical absolute accuracy of the final product depends on various parameters. In this study, we aimed to demonstrate the influenceof temporal baseline between SAR image-pairs on the vertical absolute accuracy of high resolution interferometric DSMs. Theapplication was realized covering 20 km<sup>2</sup> area in Berlin, Germany using 15 descending orbit high resolution spotlight (HS)TerraSAR-X (TSX) images. The suitable interferometric pairs were determined for DSM generation and two of them that havesimilar parameters except temporal baseline were selected regarding the purposes of the study. The master image was selected assame in the generation of both DSMs and the temporal baselines between this master image and slave images were 11 days (1period) and 187 days (17 periods), respectively. TSX HS DSMs were generated with 2 m grid spacing and the vertical absoluteaccuracies were calculated based on the comparison with a reference DSM generated by radargrammetry. The analyses were realizedfor built-up and forest land classes separately. The results proved that longer temporal baseline has negative influence on the verticalabsolute accuracies of TSX HS interferometric DSMs. The first DSM which has the shortest temporal baseline, possible for TSXsensing is better than the second one as approx. 1.5 m both for built-up and forest areas

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

Influence of temporal baseline on the vertical absolute accuracies of TSX HS interferometric DSMs: Case Study on Berlin