The effect of DEM resolution on topographic wetness index calculation and visualization: An insight to the hidden danger unraveled in Bozkurt in August, 2021

Topographic Wetness Index, also known as the compound topographic index, (TWI) is a indicator that calculates potential of where water likely to accumulate during excessive precipitation cycles resulting from abrupt atmospheric anomalies. High index values represent serious accumulation due low slope, and opposite for high slope. As expected term, Digital Elevation Model (DEM) datasets play an important role in calculation TWI. DEMs are produced utilizing tachometry, GPS benchmarking, UAV, aerial or satellite image capture LIDAR capabilities. However, no matter how it generated, DEM good actual ground sampling algorithm, on which final resolution based. Using six different resolutions coming three global one national source presented setting coverages, upper feeder basin Bozkurt sub-province, Kastamonu, was analyzed emphasizing urbanized part devastated August 11th, 2021 flood. Coarser missed overall precision while finer captured nicely. On flip side, excessively fragmented questioned area coarser formed unity coinciding with destructed recorded event.