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Comparative Analysis of Pixel and Object Based Classification Approach for Rapid Landslide Delineation with the Aid of Open Source Tools in Garhwal Himalaya

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Journal of the Geological Society of India

Abstract

Landslides are the natural geomorphic processes that are essential for the landscape development. Loss of tremendous amount of life, natural resources as well as property has made this phenomenon a natural disaster. Number of researches have been done to understand this phenomenon and how to overcome this calamity with the aid of upcoming modern information services and technological advancements. Despite all these, there are still certain undocumented slope failure events due to inaccessibility and lack of a proper database. With the advancement of satellite remote sensing and geographical information system (GIS), it has certainly become easier to monitor and prepare landslide database especially in rough and rugged terrain of the Himalaya for delineation of risk zones. Free availability of high-resolution images and an open source efficient software have certainly been proved advantageous for this purpose. This paper aims at quick and accurate landslide inventory mapping, using high resolution Sentinel 2 data along with normalized difference vegetation index (NDVI), over which unsupervised and object-based image analysis (OBIA) was done to extract landslide features in an efficient manner. Both these processes were achieved with the aid of open source SAGA (System for Automated Geoscientific Analyses) software. The performances of these classifications were analyzed for their quantitative reliability in extracting the landslide features in two different areas (test area 1 and 2). In this, the object based image classification outstands, with the overall accuracy percentage difference of 17.11% higher than pixel-based classification approach in test area 1 and about 21% higher in test area 2.

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Acknowledgements

The authors express their sincere acknowledgement to the Jawaharlal Nehru University (JNU), New Delhi, India for supporting this research by providing infrastructural and lab facilities. We would gratefully acknowledge library facilities in the form of remote access provided by Central Library, JNU for providing access to instructive research papers and journals. We would also like to extend our thanks to CSIR (Council of Scientific & Industrial Research), India for providing financial support for this research in the form of fellowship grant. We acknowledge ESA Copernicus Open Access Hub and Google earth for the source of Sentinel and Digital Globe images for mapping landslide events. We extend our gratitude to anonymous reviewers for their valuable comments and suggestions which helped to improve the quality of this manuscript.

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Correspondence to Saumitra Mukherjee.

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Asthana, H., Vishwakarma, C.A., Singh, P. et al. Comparative Analysis of Pixel and Object Based Classification Approach for Rapid Landslide Delineation with the Aid of Open Source Tools in Garhwal Himalaya. J Geol Soc India 96, 65–72 (2020). https://doi.org/10.1007/s12594-020-1505-1

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