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dc.contributor.authorMonte Moreno, Enrique
dc.contributor.authorHernández Pajares, Manuel
dc.contributor.authorLyu, Haixia
dc.contributor.authorYang, Heng
dc.contributor.authorAragon-Angel, Angela
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Matemàtiques
dc.contributor.otherUniversitat Politècnica de Catalunya. Doctorat en Ciència i Tecnologia Aeroespacials
dc.identifier.citationMonte, E. [et al.]. Estimation of polar depletion regions by VTEC contrast and watershed enhancing. "IEEE transactions on geoscience and remote sensing", 2021, p. 1-20.
dc.description.abstractThis article presents a method for determining near-Pole ionization depletion regions and troughs from global navigation satellite system (GNSS) vertical total electron content (VTEC) maps. To define the regions, we use Image processing tools, considering the VTEC maps as gray-level images. In this work, watershed segmentation is applied to determine the edges of regions, based on the flow of areas between the lowest ionization zones (<1%) and the medium ionization regions (>10%). In order to enhance the contrast between low-ionization regions and those with a higher relative ionization, the histogram of the maps is equalized, which increases the contrast of the VTEC maps, which is the distance between low-ionization regions and those with a higher relative ionization are increased. The use of percentile thresholds makes this method independent of hypotheses about the generation of depletions, their morphology, or the number of depletion regions that can occur on a map. We test the performance by comparing the depletion regions identified in eight events reported in the literature under different conditions of the ionosphere. The events used as reference were measured by satellites, radar, and GNSS. The method that we propose allows for real-time processing of GNSS VTEC maps. The morphology of the detected regions matches the shape that is reported in the literature.
dc.description.sponsorshipThis work was supported in part by Ministerio de Ciencia e Inovación (MICINN) under Project PID2019-107579RB-I00, and in part by the European Commission (EC)-Funded Activity PolarGIMs2.
dc.format.extent20 p.
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)
dc.subjectÀrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Satèl·lits i ràdioenllaços
dc.subject.lcshReal-time data processing
dc.subject.lcshGlobal Positioning System
dc.subject.otherHistogram equalization
dc.subject.otherImage segmentation
dc.subject.otherPolar depletion
dc.subject.otherPolar trough
dc.subject.otherWatershed algorithm
dc.titleEstimation of polar depletion regions by VTEC contrast and watershed enhancing
dc.subject.lemacTemps real (Informàtica)
dc.subject.lemacSistema de posicionament global
dc.contributor.groupUniversitat Politècnica de Catalunya. VEU - Grup de Tractament de la Parla
dc.contributor.groupUniversitat Politècnica de Catalunya. IonSAT - Grup de determinació Ionosfèrica i navegació per SAtèl·lit i sistemes Terrestres
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (author's final draft)
local.citation.authorMonte, E.; Hernández, M.; Lyu, H.; Yang, H.; Aragon-Angel, A.
local.citation.publicationNameIEEE transactions on geoscience and remote sensing

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