Abstract
Abstract. Deformation analysis based on multi-temporal Terrestrial Laser Scanning (TLS) surveys has been applied for many years in commercial and academic problem domains. Downsides of this technique are the sequential data acquisition as well as its limited accuracy compared to terrestrial InSAR or InRAR based technologies that are currently gaining attention of the geodetic community. A drawback of these instruments is its relative operation method while beneficially measurements within the entire field of view can be carried out simultaneously at high frequencies. At first comparative studies between TLS and InRAR scanning are presented which have been carried out at a quarry. Over the course of roughly two hours six epochs have been measured where geometric changes of different degrees have been purposely made. In order to ensure comparability concerning the outcome, both instrument coordinate systems have been transformed into a common coordinate system by applying corner cube reflectors. At last an assisted ground based RADAR approach is presented where advantages of both applied techniques are incorporated.
Highlights
A central ambition of research in the field of geodetic data acquisition is to find ways in order to capture an object or area of interest in a spatially and temporally continuous fashion
Geometric changes have been purposely introduced in local areas of a slope which were acquired by both instruments in several epochs
In order to being able to compare the outcome of both systems, which represent several contrary properties e.g. being an absolute respectively relative measuring method, geometric conversion of the point cloud from Terrestrial Laser Scanning (TLS) had to be conducted
Summary
A central ambition of research in the field of geodetic data acquisition is to find ways in order to capture an object or area of interest in a spatially and temporally continuous fashion. Recent attempts by applying ground-based RADAR (GBRADAR) in the field of deformation monitoring showed that this technology is very close in fulfilling the central ambition mentioned before. ALBA et al (2009) apply a GB-RADAR system for monitoring of a dam and raise the idea to combine ground based RADAR systems with other ranging sensors such as TLS or robotic total stations in order to solve eventual issues caused by phase unwrapping. In addition a novel methodology, referred to as assisted GB-RADAR (aGBRADAR), is proposed to solve ambiguities which have been caused by deformation based on TLS measurements.
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