At resolution coarser than 5 meters, a significant trend in accuracy decrease is visible.
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Influence of Elevation Data Resolution on Spatial Prediction of Colluvial Soils in a Luvisol Region.
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The sentences
Despite a marked trend, the Post hoc LSD test does not prove statistically significant difference between any of the resolution.
In contrast to this, RF shows an increasing trend in prediction accuracy with the increasing pixel size.
Some of the derivatives showed a trend of changing raster means with changing resolution.
The LS factor shows a clear trend.