Abstract
Abstract. Matching Persistent Scatterers (PS) to airborne optical imagery is one possibility to augment applications and deepen the understanding of SAR processing and products. While recently this data registration task was done with PS and optical nadir images the alternatively available optical oblique imagery is mostly neglected. Yet, the sensing geometry of oblique images is very similar in terms of viewing direction with respect to SAR.We exploit the additional information coming with these optical sensors to assign individual PS to single parts of buildings. The key idea is to incorporate topology information which is derived by grouping regularly aligned PS at facades and use it together with a geometry based measure in order to establish a consistent and meaningful matching result. We formulate this task as an optimization problem and derive a graph matching based algorithm with guaranteed convergence in order to solve it. Two exemplary case studies show the plausibility of the presented approach.
Highlights
Synthethic aperture radar (SAR) is the only weather and illumination independent remote sensing imaging sensor available at the moment
Our goal is to enable the assignment of single Persistent Scatterers (PS) to individual parts of the facade
We derived an iterative graph matching algorithm in order to assign lattice nodes derived from optical oblique imagery to Persistent Scatterers at facades
Summary
Synthethic aperture radar (SAR) is the only weather and illumination independent remote sensing imaging sensor available at the moment. The high geometrical resolution of some decimeters combined with a temporal change detection rate of up to some mm/year make these techniques perfectly suitable for building monitoring tasks. The assignment of single TomoSAR points or Persistent Scatterers to buildings has been conducted already (Schunert, 2014), it remains unclear in many cases which geometrical structure in the scene induces the coherent signal reflection. Oblique optical imagery is suitable for this purpose since it captures the earth’s surface from a comparable viewing direction as SAR. The combined use of SAR and optical imagery enables investigations about the physical nature of Persistent Scatterers and is a crucial step towards a highly precise building monitoring system
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