Visual interpretation of satellite imagery for monitoring floods in Bangladesh |
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Authors: | Harun Rasid M A H Pramanik |
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Institution: | (1) Department of Geography, Lakehead University, P7B 5E1 Thunder Bay, Ontario, Canada;(2) Bangladesh Space Research and Remote Sensing Organization, 1207 Agargaon, Dhaka, Bangladesh |
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Abstract: | This article presents the methods and results of visual interpretation of NOAA AVHRR imagery for mapping flood areas in Bangladesh.
Color composites of channels 1 and 2 for 18 August 1987 and 10, 15, and 24 September 1988 were interpreted visually for delineating
flood boundaries. On such imagery flood areas appear in dark tones and are separated from land (light tones) owing to the
absorption of near infrared by water and its reflectance by land and non-waterbodies. Visual interpretation was aided by the
use of ground information, such as physiographic and river maps, previous flood maps, newspaper reports, and other published
and unpublished documents on the 1987 and 1988 floods. Interpreted flood areas on selected images ranged from 31% to 43% of
the total area of Bangladesh. Visual interpretation overestimated flood areas by 5%–10%, compared to the digitally analyzed
data. The main advantage of visual analysis lies in the cost effectiveness of AVHRR photographic products, which make them
more accessible than the digital image analysis of computer-compatible tapes. |
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Keywords: | AVHRR imagery Real-time monitoring Flood boundary delineation |
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