3. Methodsandmethodology
Geographical InformationSystem(GIS)softwarewasusedto
visualize thechangeofchannelpatternofRamgangaRiver(Nath
et al.,2013; Pan,2013). ArcGIS10.1(Esri,Redlands,California,
UnitedStates)andERDASIMAGINE2010(HexagonGeospatial,GA
USA) wereusedtoanalyzethecollectedimage.Firstofall,images
aremosaicthroughERDASIMAGINE2010andAOI(Ramganga)is
extractedfromtheimagesandNormalizedDifferenceWaterIndex
(NDWI)iscalculatedforthestudyareaandfromstudyareausing