HR: 08:15h
AN: G41A-02    [PDF]
TI: SAR Interferometric Point Target Analysis for Long-Term Deformation Mapping
AU: * Werner, C
EM: cw@gamma-rs.ch
AF: Gamma Remote Sensing AG, Thunstrasse 130, Muri b. Bern, CH-3074 Switzerland
AU: Lu, Z
EM: lu@usgs.gov
AF: U.S. Geological Survey, EROS Data Center, SAIC, 47914 252nd Street, Sioux Falls, SD 57198 United States
AU: Wiesmann, A
EM: wiesmann@gamma-rs.ch
AF: Gamma Remote Sensing AG, Thunstrasse 130, Muri b. Bern, CH-3074 Switzerland
AU: Wegmuller, U
EM: wegmuller@gamma-rs.ch
AF: Gamma Remote Sensing AG, Thunstrasse 130, Muri b. Bern, CH-3074 Switzerland
AU: Tazio, T
EM: strozzi@gamma-rs.ch
AF: Gamma Remote Sensing AG, Thunstrasse 130, Muri b. Bern, CH-3074 Switzerland
AB: Repeat-pass Interferometric SAR (InSAR) is a powerful technique for mapping land surface deformation at fine spatial resolution over large areas. The application of repeat-pass InSAR is limited due to temporal and geometric decorrelation and inhomogeneities in the tropospheric path delay. Interferometric Point Target Analysis (IPTA) utilizes the unique characteristics of the tropospheric path delay and SAR backscattering of certain ground targets to achieve higher accuracy deformation measurements than attainable with conventional InSAR. Over urban areas with numerous man-made structures or in areas where large rock outcroppings are visible, it is possible to identify point-like targets that remain phase coherent over time. These targets can be used as "natural" monuments to estimate the progressive deformation of the terrain at millimeter accuracy. Building upon conventional InSAR techniques, IPTA overcomes atmospheric delay anomalies and temporal and geometric decorrelation using multi-temporal interferograms by exploring the temporal and spatial characteristics of radar interferometric signatures collected from point targets. In this contribution the IPTA concept is introduced, including the point selection criteria, the phase model and the improvement of the model parameters. Intermediate and final results of IPTA examples using data acquired using ERS1, ERS2, and JERS confirm the validity of the concept for mapping subsidence related to the extraction of oil in Belridge, California and aseismic deformation along the Raymond fault in Pasadena, California.
UR: http://www.gamma-rs.ch
DE: 1242 Seismic deformations (7205)
DE: 1243 Space geodetic surveys
DE: 1829 Groundwater hydrology
DE: 6924 Interferometry
DE: 6969 Remote sensing
SC: Geodesy [G]
MN: 2003 Fall Meeting