TUFLOW Output Discussion: Difference between revisions
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== Why are there differences between high resolution grid/raster map outputs and remapped outputs generated by the ASC_to_ASC utility? ==
Differences are expected between the direct HR output and the remap function in the asc_to_asc utility due to the different steps involved in the interpolation of water level results. <br>
The direct HR output is based on a triangulation of the water levels at the cell centres and corners. In comparison, the remap function involves two interpolation steps. The first is the interpolation from the cell centres and corners to the grid map output locations (by default, half the cell size). Then, the asc_to_asc utility interpolates the water level output to the target DEM grids with fine resolution: <br>
[[File:High-res-interpolation.jpg|600px]]<br>
The direct HR output tends to have better resolution in comparison to the remapped results. Due to the additional stages of interpolation involved with the remapped output, there is potential to lose definition in the results particularly in areas with steep slopes.
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