Assessing Flood Induced Land-Cover Changes Using Remote Sensing and Fuzzy Approach in Eastern Gujarat (India) |
| |
Authors: | Chandra S Sharma Mukund D Behera Atmaram Mishra Sudhindra N Panda |
| |
Affiliation: | (1) School of Environmental Studies and MOE Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, 430074 Wuhan, People’s Republic of China;(2) Department of Geological Sciences, The University of Alabama, Tuscaloosa, AL 35487, USA |
| |
Abstract: | Natural hazards such as flooding can cause changes in land-cover. The present study deals with the changes in land-cover in
three worst affected districts (Anand, Vadodara and Kheda) of Gujarat state in India due to severe flood during 2005. The
Indian Remote Sensing (IRS) P6 Linear Imaging Self Scanning (LISS) III satellite imageries of pre- and post-flooding periods
were used as sources of information for the study area. Three classification approaches (unsupervised ISODATA, supervised
Maximum Likelihood Classifier, and fuzzy rule based) were used to extract flood induced land-cover information. Results obtained
from the above classification approaches were compared. Soft computing technique such as fuzzy based image classification
gave better separability amongst classes as compared to hard classification techniques. The accuracy assessment showed that
the fuzzy approach can predict land-cover more accurately than traditional approach and also showed great potential for dealing
with mapping of flood induced land-cover. Unsupervised classification results for the period October 2004 to October 2005
revealed decrease in inland water bodies (14.49%) and agricultural area (6.42%) while increase in remaining land-cover. During
February 2005 to February 2006, all land-cover classes decreased except agricultural fallow and sparse vegetation. In case
of supervised classification, decreasing trend was observed only in case of agricultural area (6.78%) during October 2004
to October 2005. Similarly, during February 2005 to February 2006, increase in coastal water bodies (0.73%) and sparse vegetation
(1.7%) was observed where as decreasing trend was noticed in the remaining land-cover classes. In fuzzy based classification,
only decrease in agricultural area (7.09%) was observed from October 2004 to October 2005, whereas during February 2005 to
February 2006, decrease in area was exhibited in all land-cover classes except coastal water bodies and sparse vegetation.
Change detection indicated interchange of areas between inland and coastal water bodies and decrease in agricultural area
leading to increase in area of agricultural fallow and sparse vegetation. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|