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IEEE T. Geoscience and Remote Sensing. 01/2011; 49:1755-1771.
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2011 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2011, Vancouver, BC, Canada, July 24-29, 2011; 01/2011
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2011 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2011, Vancouver, BC, Canada, July 24-29, 2011; 01/2011
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IEEE T. Geoscience and Remote Sensing. 01/2011; 49:53-64.
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IEEE International Geoscience & Remote Sensing Symposium, IGARSS 2010, July 25-30, 2010, Honolulu, Hawaii, USA, Proceedings; 01/2010
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IEEE International Geoscience & Remote Sensing Symposium, IGARSS 2010, July 25-30, 2010, Honolulu, Hawaii, USA, Proceedings; 01/2010
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IEEE International Geoscience & Remote Sensing Symposium, IGARSS 2010, July 25-30, 2010, Honolulu, Hawaii, USA, Proceedings; 01/2010
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IEEE T. Geoscience and Remote Sensing. 01/2009; 47:202-213.
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IEEE T. Geoscience and Remote Sensing. 01/2009; 47:174-188.
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IEEE International Geoscience & Remote Sensing Symposium, IGARSS 2009, July 12-17, 2009, University of Cape Town, Cape Town, South Africa, Proceedings; 01/2009
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ABSTRACT: Entropy, alpha and anisotropy (H/alpha/A) of the polarimetric target decomposition has been an effective and popular tool for polarimetric SAR image analysis and for geophysical parameter estimation. However, multi-look processing can severely affects the values of these parameters. In this paper, Monte Carlo simulation is used to evaluate the multi-look effect on these parameters for various media of grass, forest and urban. Due to insufficient averaging, entropy is underestimated and anisotropy is overestimated. We also found that the bias in Alpha angle can be either under or overestimated depending on scattering mechanisms. Based on simulation results, efficient bias removal procedures have been developed. In particular, the entropy bias can be precisely corrected independent of radar frequency and SAR systems. Data from L-band DLR/E-SAR and L-band JPL/AIRSAR, and X-band PI-SAR data are used for demonstration.
Synthetic Aperture Radar (EUSAR), 2008 7th European Conference on; 07/2008
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ABSTRACT: Analysis of dual polarimetric SAR imagery has taken on new importance with the recent launches of the POLSAR and TERRASAR-X polarimetric SAR systems, and the soon to be launched RADARSAT-2 polarimetric SAR. While these space borne polarimetric SARs can provide full polarimetric imagery, a majority of the collected imagery will be restricted to dual polarimetric imaging modes. Here we develop polarimetric analysis methods specific to the dual-pol imagery modes typically available from the new space borne SAR systems, i.e. (HH, VH), (VV, HV) and (VV, HH). We employ available quad-pol imagery as the baseline for all comparisons. From the full quad-pol data we extract the data corresponding to each individual dual-pol imaging modes. We pay particular attention to the information content of each dual-pol imaging mode, comparing them against the quad-pol imaging results. Other points of comparison are the hybrid dual-pol modes, e.g. transmitting a circular polarization and coherently receiving H and V linear polarizations. These dual polarimetric analysis methods aid the interpretation and application of dual polarimetric SAR imagery.
Synthetic Aperture Radar (EUSAR), 2008 7th European Conference on; 07/2008
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ABSTRACT: The prevailing complex geological and ecological conditions of Taiwan have drawn considerable attention from various geo-ecological communities because of their vulnerability to produce various natural hazards at different scales. Located in the tropical/subtropical zone of the Pacific Rim, its ecological and rugged mountainous properties are environmentally sensitive making monitoring and observations especially difficult because of the high population density. For example, in terms of natural hazard mitigation tectonically active regions are used for analyzing the cause of abundant risk events, such as earthquakes, landslides and land subsidence. In fact Taiwan is well suited as a test site for studying those geologically disastrous processes. Implementing novel techniques of space remote sensing has proved to be an effective means in recent years for greatly improving our understanding of these phenomena. In this paper we report on the monitoring of such events using multi-modal polarimetric and/or interferometric SAR images at C and L band from ERS, JERS-1, RADARSAT-1, ENVISAT, and from the recent ALOS satellite. For crustal and surface deformation, we used radar image pairs with long temporal baselines and large areas of coverage for investigating deformation over Western Taiwan. Pre-seismic and co-seismic deformation patterns are spatial-temporally analyzed. The other topic deals with the coastline changes observed from a sequence of ERS-1/2 SAR images within the years of 1996 to 2005. Waterlines were extracted using multi-scale procedures of edge detection and were corrected with tidal motion data. Substantial analyses were carried out in conjunction with ground surveys and lidar mapping. The topographic feature changes due to large scale landslides triggered by torrential rains were also monitored. In addition, the SAR interferograms were used to analyze the deposition changes along the riverbeds and riverbanks for short-intervals using optimal baselines. Su-
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mmary and remarks on the implementation of such multi-modal polarimetric and/or interferometric SAR imagery for environmental monitoring are provided.
Synthetic Aperture Radar (EUSAR), 2008 7th European Conference on; 07/2008
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IEEE T. Geoscience and Remote Sensing. 01/2008; 46:3039-3052.
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IEEE International Geoscience & Remote Sensing Symposium, IGARSS 2008, July 8-11, 2008, Boston, Massachusetts, USA, Proceedings; 01/2008
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[show abstract]
[hide abstract]
ABSTRACT: The prevailing complex geological and ecological conditions of Taiwan have drawn considerable attention from various geo-ecological communities because of their vulnerability to produce various natural hazards at different scales. Located in the tropical/subtropical zone of the Pacific Rim, its ecological and rugged mountainous properties are environmentally sensitive making monitoring and observations especially difficult because of the high population density. For example, in terms of natural hazard mitigation tectonically active regions are used for analyzing the cause of abundant risk events, such as earthquakes, landslides and land subsidence. In fact Taiwan is well suited as a test site for studying those geologically disastrous processes. Implementing novel techniques of space remote sensing has proved to be an effective means in recent years for greatly improving our understanding of these phenomena. In this paper we report on the monitoring of such events using multi-modal polarimetric and/or interferometric SAR images at C and L band from ERS, JERS-1, RADARSAT-1, ENVISAT, and from the recent ALOS satellite. For crustal and surface deformation, we used radar image pairs with long temporal baselines and large areas of coverage for investigating deformation over Western Taiwan. Pre-seismic and co-seismic deformation patterns are spatial-temporally analyzed. The other topic deals with the coastline changes observed from a sequence of ERS-1/2 SAR images within the years of 1996 to 2005. Waterlines were extracted using multi-scale procedures of edge detection and were corrected with tidal motion data. Substantial analyses were carried out in conjunction with ground surveys and lidar mapping. The topographic feature changes due to large scale landslides triggered by torrential rains were also monitored. In addition, the SAR interferograms were used to analyze the deposition changes along the riverbeds and riverbanks for short-intervals using optimal baselines. Su-
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mmary and remarks on the implementation of such multi-modal polarimetric and/or interferometric SAR imagery for environmental monitoring are provided.
Geoscience and Remote Sensing Symposium, 2007. IGARSS 2007. IEEE International; 08/2007
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IEEE International Geoscience & Remote Sensing Symposium, IGARSS 2007, July 23-28, 2007, Barcelona, Spain, Proceedings; 01/2007
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IEEE International Geoscience & Remote Sensing Symposium, IGARSS 2007, July 23-28, 2007, Barcelona, Spain, Proceedings; 01/2007
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IEEE International Geoscience & Remote Sensing Symposium, IGARSS 2007, July 23-28, 2007, Barcelona, Spain, Proceedings; 01/2007
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ABSTRACT: Identification of manmade structures from radar images has always been a difficult task, especially for single-polarization radar. Fully polarimetric radar, however, can provide detailed information on scattering mechanisms that could enable the target or the structure to be identified. Complexity remains stemming from overlaps of single bounce scattering, double bounce scattering and triple and higher order bounce scattering from various components of manmade structure that makes physical interpretation a challenge. In this paper, we will present an interesting example using polarimetric SAR data of the Great Belt Bridge, Denmark, to illustrate the capability of polarimetric SAR in analyzing radar signatures. Polarimetric target decomposition is used to differentiate the multiple bounce scattering contributions contained in the polarimetric SAR images. Two C-band Danish EMISAR data takes, the first obtained during the bridge's construction and the second after its completion, are used to extract the scattering characteristics of the bridge deck, bridge cables and supporting structures.
Radar Symposium, 2006. IRS 2006. International; 06/2006
