Volcanoes as targets for InSAR vary greatly in the quality of their returned phase signal. There are two end-member volcano types from this perspective. Basaltic, low-relief shield volcanoes with frequent effusive eruptions and shallow magma reservoirs generally give excellent coherence and large magnitude ground deformations (~1m) that can be easily detected and modelled. However, their indivi...

We quantify the bias and uncertainty of interferometric synthetic aperture radar (InSAR) displacement time series and their derivatives, the displacement velocities, by analyzing the systematic and stochastic components of the temporal variation of the tropospheric delay. The biases due to the systematic seasonal delay depend on the SAR acquisition times, whereas the uncertainties depend on the...

S U M M A R Y Errors in the satellite orbits are considered to be a limitation for Interferometric Synthetic Aperture Radar (InSAR) time-series techniques to accurately measure long-wavelength (>50 km) ground displacements. Here we examine how orbital errors propagate into relative InSAR line-of-sight velocity fields and evaluate the contribution of orbital errors to the InSAR uncertainty. We e...

Within the last decade, Interferometric Synthetic Aperture Radar (INSAR) processing has emerged as an important extension of conventional SAR because it can be used to infer topographic heights of the imaged terrain. The demand for high-resolution, large coverage-area topographic data is driving new INSAR systems to acquire data in long strips. When processing long strips of INSAR data, the mot...

Errors in radar satellite orbit determination are common problems in radar interferometry (InSAR). For example, when trying to locate a radar test site with known geographic coordinates using the geocoding information in SAR image (the latitude and longitude of the four image corners), the location may be well away from the true position. Another example is when there is indeed a significant si...

In radar images, point scatterers provide reflections that can often be attributed to a single physical object, usually smaller than the resolution cell size. Stable point scatterers with high backscatter coefficients through time (mainly ’man-made features’) are potential targets for InSAR deformation analysis. A-priori knowledge about the observation statistics of InSAR point scatterer measur...

Synthetic aperture radar (SAR) Persistent Scatterer Interferometry (PS-InSAR) is an extension of the Differential Interferometry (D-InSAR). Using a large data stack consisting of a time-series of SAR images of the same area, stable reflectors which persist over a long period of time, the so-called Persistent Scatterers (PS), are determined and the phase shifts of these PS over time are measured...

The automatic 3-D reconstruction of buildings for the generation of city models is of great interest for different tasks. Besides the classical photogrammetric approaches to determine object heights indirectly, range sensors like laser (LIDAR) and interferometric SAR (InSAR) play an important role since recent years. From both sensors images are produced with a ground resolution better than a m...

InSAR data acquired from independent overlapping tracks can be exploited for a reliability assessment of the Persistent Scatterer InSAR (PS-InSAR) technique. Here we present a mathematical framework for the datum connection of multiple tracks, simultaneously evaluating the precision and reliability of PS-InSAR estimates. This datum connection can be subdivided in two steps. Firstly, the PS loca...

a r t i c l e i n f o Keywords: InSAR StaMPS SBAS Land subsidence Ground fissure Fault Geohazards Xi'an Xi'an, China has been undergoing significant land subsidence along with ground fissure development. These geohazards have brought about severe damages to buildings, bridges and other facilities. In order to warn of and mitigate disasters, it is urgently necessary to obtain the latest rate, ex...