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Crater morphology and volcanic products coverage analyses at agung volcano based on polarimetic decomposition of sentinel-1a SAR data
Panjaitan J.L.M.a, Saepuloh A.a, Wikantika K.a
a Centre for Remote Sensing, Bandung Institute of Technology (ITB), Indonesia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© 2018 Proceedings – 39th Asian Conference on Remote Sensing: Remote Sensing Enabling Prosperity, ACRS 2018. All rights reserved.This paper presents the techniques for analyzing the topographical changes of the summit of AgungVolcano including crater morphology and volcanic ash coverage following the eruption based on Sentinel-1A data.Following dormant period for about 50 years, Agung volcano entered a new eruption phase, that is identified by fumaroleactivities in early November 2017, followed by a phreatic eruption at 21 November 2017 and magmatic eruption at 25November 2017, 24 December 2017, 11 January 2018, 11 March 2018, 28-29 June 2018, and 2 July 2018. Mitigationscenarios are necessary to prevent inevitable loss of thousand lives. Therefore, this study is raised to assist to decisionmaker especially for mapping the hazard near the summit correctly. To obtain the morphological change related to theeruptions, a topographical change detection technique is proposed using series of Synthetic Aperture Radar (SAR)remote sensing images. Polarimetric Decomposition method was selected to identify the properties of Agung Summitbased on SAR backscattering intensity measurement. The analyses were taken into account based on entropy (H) andalpha angle (a) produced by polarimetric backscattering decomposition. In addition, the optic sensor image from Sentinel2 was also used to clarify the results of polarimetric decomposition method. Then, the results of both images wereanalysed spatially and temporally. According to spatial and temporal analyses, the topographical change of AgungSummit could be detected because new volcanic products existed (e.g. lava flow and fumarole steam) inside and outsidethe crater. The lava flows were distributed mostly at western part in the crater rim about 20.251 ha. Meanwhile, fumarolesteam was distributed mostly at northern part in the crater rim about 13.216 ha. The temporal variation of volcanicproducts distribution could describe Agung Volcano eruption stages.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Backscattering intensity,Morphological changes,Polarimetric decomposition,Remote sensing images,Spatial and temporal analysis,Temporal variation,Topographical changes,Volcano eruptions[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Agung Volcano,Backscattering Intensity of Surface,Topographical Change Detection[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]