Mapping Submarine Geomorphology of the Philippine and Mariana Trenches By an Automated Approach Using GMT Scripts
Résumé
Abstract This paper presents a geospatial analysis of two oceanic trenches using a GMT (Generic Mapping Tools) cartographic method that exploits the scripting approach to visualisation of their geometric shapes. To this end, the research applies the high-resolution datasets GEBCO and ETOPO1 and ETOPO5 for modelling of the submarine relief. This allows taking into account the 2D and 3D shape deviations in the geomorphology of the two selected segments of the trenches by transecting a series of the cross-section profiles. A scripting algorithm of spatial data processing based on the GMT techniques visualised the topography of the submarine objects in 2D and 3D forms and extracted the topographic data from raster grids for statistical analysis of depth using the cross-section transect profiles of both trenches. The bathymetry of the Mariana Trench was evaluated in the southern segment located near the Challenger Deep area, southwest of Guam Island, in comparison with the segment of the Philippine Trench, which was transected in the surroundings of Mindanao Island. The study presented a comparative submarine geomorphic modelling and spatial analysis of the Philippine Sea basin area. The bathymetric analysis of the relief in the Mariana and Philippine trenches showed effective performance of the GMT scripting toolset in advanced cartographic data analysis and visualisation.
Ðajâ rakstâ sniegta divu okeâna tranðeju ìeotelpiskâ analîze, izmantojot GMT kartogrâfisko metodi, kas izmanto skriptu pieeju to ìeometrisko formu vizualizçðanai. Ðim nolûkam zemûdens reljefa modelçðanai tiek izmantotas augstas izðíirtspçjas datu kopas GEBCO un ETOPO1 un ETOPO5. Tas ïauj òemt vçrâ 2D un 3D formas novirzes divu atlasîto tranðeju segmentu ìeomorfoloìijâ, pârgrieþot virkni ðíçrsgriezuma profilu. Telpisko datu apstrâdes skriptu algoritms, kas balstîts uz GMT metodçm, vizualizçja zemûdens objektu topogrâfiju 2D un 3D formâs un ieguva topogrâfiskos datus no rastra reþìiem dziïuma statistiskai analîzei, izmantojot abu tranðeju ðíçrsgriezuma transektu profilus. Marianas tranðejas batimetrija novçrtçta dienvidu segmentâ, kas atrodas netâlu no Challenger Deep apgabala, uz dienvidrietumiem no Guamas salas, salîdzinot ar Filipînu tranðejas segmentu, kas ir transektçts Mindanao salas apkârtnç. Pçtîjumâ tika piedâvâta Filipînu jûras baseina apgabala salîdzinoða zemûdens ìeomorfiskâ modelçðana un telpiskâ analîze. Papildus reljefa batimetriskai analîzei Marianas un Filipînu tranðejâs ðajâ rakstâ ziòots par GMT skriptu rîku kopas efektîvu veiktspçju uzlabotajâ kartogrâfisko datu analîzç un vizualizâcijâ.
Domaines
Informatique [cs] Synthèse d'image et réalité virtuelle [cs.GR] Océanographie Tectonique Ingénierie assistée par ordinateur Langage de programmation [cs.PL] Océan, Atmosphère Sciences de la Terre Sciences de l'environnement Géomorphologie Géophysique [physics.geo-ph] Planète et Univers [physics]Origine | Fichiers éditeurs autorisés sur une archive ouverte |
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