TY  - JOUR
A1  - Abdullahi, Sahra
A1  - Wessel, Birgit
A1  - Huber, Martin
A1  - Wendleder, Anna
A1  - Roth, Achim
A1  - Kuenzer, Claudia
T1  - Estimating penetration-related X-band InSAR elevation bias: a study over the Greenland ice sheet
JF  - Remote Sensing
N2  - Accelerating melt on the Greenland ice sheet leads to dramatic changes at a global scale. Especially in the last decades, not only the monitoring, but also the quantification of these changes has gained considerably in importance. In this context, Interferometric Synthetic Aperture Radar (InSAR) systems complement existing data sources by their capability to acquire 3D information at high spatial resolution over large areas independent of weather conditions and illumination. However, penetration of the SAR signals into the snow and ice surface leads to a bias in measured height, which has to be corrected to obtain accurate elevation data. Therefore, this study purposes an easy transferable pixel-based approach for X-band penetration-related elevation bias estimation based on single-pass interferometric coherence and backscatter intensity which was performed at two test sites on the Northern Greenland ice sheet. In particular, the penetration bias was estimated using a multiple linear regression model based on TanDEM-X InSAR data and IceBridge laser-altimeter measurements to correct TanDEM-X Digital Elevation Model (DEM) scenes. Validation efforts yielded good agreement between observations and estimations with a coefficient of determination of R\(^2\) = 68% and an RMSE of 0.68 m. Furthermore, the study demonstrates the benefits of X-band penetration bias estimation within the application context of ice sheet elevation change detection.
KW  - InSAR height
KW  - penetration bias
KW  - cryosphere
KW  - TanDEM-X
KW  - Greenland ice sheet
KW  - DEM
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-193902
SN  - 2072-4292
VL  - 11
IS  - 24
ER  -