Social media have become an important communication tool and backstage for the dissemination of information for Honduran migrants seeking political asylum and international refugee status in the United States at the O...Social media have become an important communication tool and backstage for the dissemination of information for Honduran migrants seeking political asylum and international refugee status in the United States at the Otay Mesa Port of Entry. This nonmainstream structure of communication can be conceived as a type of counterargument to international border policies. In this essay, I examine how Bartolo Fuentes’s <em>Caminata del Migrante</em> post digitally informed migrant decision making processes, enforced migrant solidarity, and spurred a digital heterotopia providing a back and forth sharing of opinions and information between migrants, political actors, advocacy groups, and the press.展开更多
Based on the general geometric model of multi-baseline Synthetic Aperture Radar Tomography （TomoSAR）, the three-dimensional （3-D） sampling criteria, the analytic expression of the 3-D Point Spread Function （PSF）...Based on the general geometric model of multi-baseline Synthetic Aperture Radar Tomography （TomoSAR）, the three-dimensional （3-D） sampling criteria, the analytic expression of the 3-D Point Spread Function （PSF） and the 3-D resolution are derived in the 3-D wavenumber domain in this paper. Considering the relationship between the observation geometry and the size of illuminated scenario, a 3-D Range Migration Algorithm with Elevation Digital Spotlighting （RMA-EDS） is proposed. With this algorithm 3-D images of the area of interest can be directly and accurately reconstructed in the 3-D space avoiding the complex operations of 3-D geometric correction. Finally, theoretical analyses and simulation results are presented to demonstrate the shift-varying property of the 3-D PSF and the spatialvarying property of the 3-D resolution and to demonstrate the validity of the 3-D RMA-EDS.展开更多
文摘Social media have become an important communication tool and backstage for the dissemination of information for Honduran migrants seeking political asylum and international refugee status in the United States at the Otay Mesa Port of Entry. This nonmainstream structure of communication can be conceived as a type of counterargument to international border policies. In this essay, I examine how Bartolo Fuentes’s <em>Caminata del Migrante</em> post digitally informed migrant decision making processes, enforced migrant solidarity, and spurred a digital heterotopia providing a back and forth sharing of opinions and information between migrants, political actors, advocacy groups, and the press.
基金Supported by the National Science Fund for Distinguished Young Scholars (Grant No. 60725103)the National Natural Science Foundation ofChina (Grant No. 60602015)+1 种基金the National Key Laboratory Foundation (Grant No. 9140C1903030603)the Knowledge Innovation Programof Chinese Academy of Sciences (Grant No. 07QNCX-1154)
文摘Based on the general geometric model of multi-baseline Synthetic Aperture Radar Tomography （TomoSAR）, the three-dimensional （3-D） sampling criteria, the analytic expression of the 3-D Point Spread Function （PSF） and the 3-D resolution are derived in the 3-D wavenumber domain in this paper. Considering the relationship between the observation geometry and the size of illuminated scenario, a 3-D Range Migration Algorithm with Elevation Digital Spotlighting （RMA-EDS） is proposed. With this algorithm 3-D images of the area of interest can be directly and accurately reconstructed in the 3-D space avoiding the complex operations of 3-D geometric correction. Finally, theoretical analyses and simulation results are presented to demonstrate the shift-varying property of the 3-D PSF and the spatialvarying property of the 3-D resolution and to demonstrate the validity of the 3-D RMA-EDS.
