Delineation of surface waterlogged areas in parts of bihar using IRS-1C LISS-III data |
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Authors: | Chandranath Chatterjee Rakesh Kumar Pankaj Mani |
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Institution: | 1.Centre for Flood Management Studies,National Institute of Hydrology WALMI Complex,Patna |
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Abstract: | Pre-monsoon and post-monsoon surface waterlogged areas were delineated using satellite remote sensing data for Muzaffarpur,
Vaishali and Saran districts of North Bihar. Digital data of IRS-1C LISS-III sensor acquired on December 7, 1998 and April
6, 1999 were analyzed using digital image processing software-ERDAS Imagine 8.3.1. The surface waterlogged areas were delineated
using modeling technique which is the most advanced and accurate method. Using the modeling technique, a pixel is classified
as water if the digital number (DN) value of its Near Infra Red (NIR) band is less than the DN value of the Red band and the
Green band, and the Normalized Difference Water Index (NDWI) is greater than or equal to 0.32. The pre-monsoon surface waterlogged
areas are found to be 14.02, 23.61 and 9.61 km2 while the post-monsoon surface waterlogged areas are found to be 231.83, 118.19 and 176.06 km2 for Muzaffarpur, Vaishali and Saran districts, respectively. Also, land use/land cover maps were prepared. |
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