Satellite Image Based Mapping of Wetland Tundra Landscapes Using ILWIS GIS
Résumé
Presentation shows an application of ILWIS GIS for RS data processing with a case study of detecting land cover changes during 20-year period (1988-2011) in Yamal Peninsula, Arctic. Research goals: Distribution of different types of landscapes in the wetland tundra of the Yamal Peninsula; Monitoring changes in the landscapes of tundra; Analysis of the landscape dynamics for 2 decades (1988-2011). Data include 2 satellite images: Landsat TM for 1988 and 2011. Methods include clustering, segmentation and classification. Technical approach: Landsat TM data processing by ILWIS GIS. Methods: Supervised classification of Landsat TM images. Results demonstrated changes in selected land cover types. Study area: tundra landscapes in the wetlands of the Yamal Peninsula in the Far North of Russia. Statistical results of calculations of types of vegetation cover were obtained in a semi-automatic mode in ILWIS GIS. In 1988 ’willow shrubs’ type covered 412,292 pixels from the total part of the AOI, and ’high willow’ class is 823,430 pixels. 2011: willow increased to 651427 pixels, (’willow shrubs’), and 893092 pixels (’high willows’). Both combined classes of willows, typical for AOI with a high water content, cover total 1544519 pixels, which is 40.27 %. Area of grasses decreased compared to shrub and willow. Max area covered by class ’heather and dry grass’ is 933798 pixels
Domaines
Informatique [cs] Vision par ordinateur et reconnaissance de formes [cs.CV] Biodiversité et Ecologie Milieux et Changements globaux Traitement des images [eess.IV] Algorithme et structure de données [cs.DS] Synthèse d'image et réalité virtuelle [cs.GR] Ingénierie assistée par ordinateur Modélisation et simulation Apprentissage [cs.LG] Automatique Analyse numérique [cs.NA] Logiciel mathématique [cs.MS] Recherche d'information [cs.IR] Logique en informatique [cs.LO] Planète et Univers [physics] Sciences de la Terre Sciences de l'environnement Ingénierie de l'environnement Environnement et Société
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