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For estimating the how much the coastal land can be life is affected by the increment of sea level, topography data plays a major role. However, the quality of the spatial resolution and vertical accuracy of the Digital Elevation Model (DEM) data source has a great influence on the accuracy of the inundation mapping. DEM data with high accuracy obtained from LIDAR usually used extensively in inundation modeling. Yet, this DEM data not always feasible given time where the LIDAR data is not available at some area in the Malaysian region and have the constraint in terms of the budget. Therefore, it is interesting to learn and what can the open-source DEM data (SRTM, ASTER GDEM-, GMTED2010) can be accomplished because it can be assessed and downloaded freely without charge even the data accuracy is respectively low.in spite of
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