Published 2023-04-26
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Copyright (c) 2023 European Journal of Geography
This work is licensed under a Creative Commons Attribution 4.0 International License.
Abstract
Topographic wetness indices (TWIs) computed from digital elevation models (DEMs) are
means to forecast the amount of moisture in the soil. In this study, using sub-pixel/pixel
attraction the spatial resolution of digital elevation models (DEM) was increased. In the
attraction, model scale factors of (2,3,4) with two neighboring methods of touching and
quadrant are applied to DEMs in Matlab software for the study area. The algorithm is
evaluated using 148 sample points that were measured by the researchers. As a result, it was
shown that a spatial attraction model with a scale factor of (S=2) gives better results compared
to the scale factors greater than 2 and also touching neighboring are more accurate then
quadrant. The results showed that waterway obtaining from DEM with high spatial resolution
is more accurate than DEM 90m. So according to the results, it is suggested that the same
model for increasing spatial resolution of DEM in the studies must be used. Furthermore, the
results of TWI map with the new DEM extracting of attraction model as input data showed that
TWI has more details from the moisture of soil than the TWI map prepared with DEM 90m.