Tuesday, December 31, 2019

Inundation Distribution Of The Study Area - 1542 Words

3. Methods Since the study area is surrounded by two major rivers the vast plains and fans are suspected to contain some level water logging. For this study the inundation distribution of the study area is taken from PNG Resource Information System (PNGRIS, 2008). The data is in polygon shape file format and coded with classes of inundation types from ‘tidal flooding, permanent flooding to the least as ‘no flooding’. For this study ‘no flooding’ level is excluded. According to PNG forestry logging practices, swamp forest are not to be logged. Swampy forests must be avoided as much as possible during logging operations. However, for this study it used to for the post-classification process purposely for refining classified swamp forest†¦show more content†¦The target class was forest class. In level 2 eight (8) classes were used (Table 1) based on the PNG forest base map of 2012 and forest inventory mapping system (FIMS) classification (McAlpine and Quigl ey, 1998). Level 2 is the lowest classification level achieved through the post-classification process. Additional classes are applied to describe the selectively harvested areas which are identified when conducting the supervised classification of the preceding years (2000, 2005, 2010 and 2015). Above-ground biomass sites will be treated as secondary training sets to transformed LULC maps to AGB maps for carbon change assessment as one option. The other option is to be used after the LULC goes through change detection process (spatially). Supervised classification method was applied to Vailala Block 3 Landsat AGP images from 1995 to 2015. This method allows the user to identify training areas that are used to teach the image on what pixel range to be classified according to user LULC descriptions (Samanta et al., 2011). For this study the parametric method know as maximum likelihood under the decision rule statistical approach was used to run all the supervised classification from 1995 and 2015. Table 1. Land use and land cover types with codes Post-classification or reassessment of a classed image is performed to refine the classified image. YearShow MoreRelatedThe Sea Level Of Bangladesh1548 Words   |  7 Pagesimmensely negative (Cazenave and Nicholls 2010).For example, based on national studies, a 1 m rise could cause losses of about 9.5 million tons of rice in Bangladesh (Mimura and Nicholls 2008). Rice is the staple crop of half of world’s population and it is the most major staple sustenance for Bangladesh. 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