TUFLOW HR Output: Difference between revisions
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High-Resolution (HR) Grid/Raster Map Outputs was first introduced in TUFLOW 2020-10-AB release. When an SGS model uses “<font color="blue"><tt>SGS Approach </tt></font> <font color="red"><tt>== </tt></font> <font color="black"><tt>Method C</tt></font>”, the sampled elevations are retained at the end of the geometry processing. These sub-grid elevations include topography modifiers such as breaklines, and they allow a high-resolution elevation check file to be written and used for high-resolution depth map outputs. Currently, ASC, FLT and TIF raster formats are supported.
For the HR output, the water level at each HR output location is interpolated from the computed 2D water levels. The depth is the difference between the interpolated water level and the sub-grid elevation. This differs from the standard depth output which calculates the depths at cell centres and corners first, then
[[File:Sgs_std_output.png|360px]] [[File:Sgs_hr_output.png|360px]]
The advantage of the HR output is that it can retain the sub-grid detail of the terrain information even at a coarse cell size. As compared in the example below, the HR depth output shows a clear flow path even at a 100m grid. However, nicer depth output does not mean reliable hydraulic result. In fact, the 100m cell size is too coarse to produce reliable/converged hydraulic results for any real-world flood model. It's is strongly recommended that the model convergence/benchmarking tests
[[File:Sgs_std_vs_hr_output.png|720px]]
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