Anno di pubblicazione: 2014
[Chi.SCORE2014t] M. T. Chiaradia, D. Conte, F. Bovenga, A. Refice, L. Guerriero, F. Nirchio, “COSMO-SkyMed constellation capabilities for DEM generation”. First WORKSHOP on the State of the art and Challenges Of Research Efforts @POLIBA (SCORE@POLIBA), December 3-5, 2014, Politecnico di Bari, Italy. ISBN: 978-88-492-2965-3.
The COSMO/SkyMed (CSK) constellation acquires data from its four SAR X-band satellites in several imaging modes and different view angles. The paper investigates its capabilities for ground elevation measurement through both radargrammetric and interferometric techniques, and evaluates the impact of the improved spatial resolution with respect to the previous SAR sensors. Parkfield (California, USA) has been selected as test site thanks to the availability of consistent dataset of CSK images acquired in both stripmap and spotlight modes. The interferometric analysis shows that, under proper conditions, tandem-like pairs with normal baselines higher than 300 m allow to derive interferometric DEMs fulfilling the HRTI Level 3 standard. SAR radargrammetry is less accurate but more robust than interferometric methods, which can be strongly affected by coherence losses, atmospheric artifacts and phase unwrapping errors. Persistent Scatterers are used as GCPs for the performance assessment.
This work has been partly funded by the Italian Space Agency in the context of the CRESP project (Cosmo Radar Expert System of Processing), in the framework of the second thematic announcement on “Earth Observation” reserved to SME.