Abstract
Abstract. Numerous advances have been made recently in photogrammetry, laser scanning, and remote sensing for the creation of 3D city models. More and more cities are interested in getting 3D city models, be it for urban planning purposes or for supporting public utility companies. In areas often affected by natural disaster, rapid updating of the 3D information may also be useful for helping rescue forces. The high resolutions that can be achieved by the new spaceborne SAR sensor generation enables the analysis of city areas at building level and make those sensors attractive for the extraction of 3D information. Moreover, they present the advantage of weather and sunlight independency, which make them more practicable than optical data, in particular for tasks where rapid response is required. Furthermore, their short revisit time and the possibility of multi-sensor constellation enable providing several acquisitions within a few hours. This opens up the floor for new applications, especially radargrammetric applications, which consider acquisitions taken under different incidence angles. In this paper, we present a new approach for determining building heights, relying only on the radargrammetric analysis of building layover. By taking into account same-side acquisitions, we present the workflow of building height determination. Focus is set on some geometric considerations, pixel-based approach for disparity map calculation, and analysis of the building layover signature for different configurations in order to determine building height.
Highlights
1.1 MotivationDue to the high resolution they can achieve, space borne SAR sensors are gaining importance for applications in urban areas
Several SAR approaches for building height determination have been implemented in the last decade, the more successful relying on mono-aspect or multi-aspect InSAR Data or on Persistent Scatterer Interferometry (PSI)
It is possible to analyse urban areas with several acquisitions taken under different incidence angles within a short time span
Summary
Due to the high resolution they can achieve, space borne SAR sensors are gaining importance for applications in urban areas. The infrastructures are affected, and a rapid change detection analysis is required in order to help emergency troops rescuing possible victims or finding suitable places for transitional shelters. In such cases, 3D information is useful. Operational SAR sensors like TerraSAR-X, TanDEM-X, and COSMO-Skymed, allow a fast revisit time of the same area. This time does not exceed two days considering each satellite alone and can be reduced to a few hours considering multi-sensor constellations. We exploit this opportunity, showing the possibility of rapid building height determination by radargrammetry, using data from TerraSAR-X
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