Howard A. Zebker

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1 2 Abstract A radar interferometric technique for topographic mapping of surfaces promises a high resolution, globally consistent approach to generation of digital elevation models. One implementation approach, that of utilizing a single synthetic aperture radar system in a nearly repeating orbit, is attractive not only for cost and complexity reasons but(More)
Interferometric radar techniques often necessitate two-dimensional (2-D) phase unwrapping, defined here as the estimation of unambiguous phase data from a 2-D array known only modulo 2pi rad. We develop a maximum a posteriori probability (MAP) estimation approach for this problem, and we derive an algorithm that approximately maximizes the conditional(More)
1 2 A radar interferometric technique for topographic mapping of surfaces promises a high resolution approach to generation of digital elevation models. We present here analyses of data collected by the synthetic aperture radar instrument on board the ERS-1 satellite on successive orbits. Using a single satellite in a nearly repeating orbit is attractive(More)
In the summer of 1991 the NASA DC-8 airborne synthetic aperture radar (SAR) system acquired data with the radar configured in a C-band across-track interferometer mode. The data were processed to generate rectified topographic maps. A new processing scheme was developed featuring motion compensation, absolute phase retrieval, and three-dimensional location.(More)
Two-dimensional (2-D) phase unwrapping, that is, deducing unambiguous phase values from a 2-D array of values known only modulo 2pi, is a key step in interpreting data acquired with synthetic aperture radar interferometry. Noting the recent network formulation of the phase unwrapping problem, we apply here some well-established ideas of network theory to(More)
Interferogram images derived from repeat-pass paceborne synthetic aperture radar systems exhibit artifacts due to the time and space variations of atmospheric water vapor. Other tropospheric variations, such as pressure and temperature, also induce distortions, but the effects are smaller in magnitude and more evenly distributed throughout the interferogram(More)
Volcanic uplift, caused by the accumulation of magma in subsurface reservoirs, is a common precursor to eruptions. But, for some volcanoes, uplift of metres or more has not yet led to an eruption. Here we present displacement maps of volcanoes in the Galápagos Islands, constructed using satellite radar interferometry, that might help explain this dichotomy.(More)
di erential radar interferometry: the Landers earthquake Howard A. Zebker, Paul Rosen, Richard M. Goldstein, Andrew Gabriel, and Charles L. Werner Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive Pasadena, CA 91109 May 10, 1994 To be subm itted to: JGR Earth Please address corresp ondence to: Howard A. Zebker MS 300-227 Jet(More)