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TUFLOW HR Output: Difference between revisions

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=Introduction=
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 interpolate the depths to the standard output grid locations (default is half the cell size). The difference in the interpolation process is illustrated below.
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[[File:Sgs_std_vs_hr_output.png|720px]]
 
=Enable High -Resolution Output=
To produce high-resolution output, add “HRASC”, “HRFLT” or “HRTIF” to the “<font color="blue"><tt>Map Output Format </tt></font> <font color="red"><tt>==</tt></font>” command, for example:
 
<font color="blue"><tt>Map Output Format </tt></font> <font color="red"><tt>== </tt></font> <font color="black"><tt>XMDF TIF HRTIF</tt></font>
 
At the moment, only water level and depth are supported as the High -Resolution Output formats, i.e.:
 
<font color="blue"><tt>HRTIF Map Output Data Types </tt></font> <font color="red"><tt>== </tt></font> <font color="black"><tt>h d</tt></font>
 
The map output data types and output interval can be defined separately for the High -Resolution Output formats. For example:
 
<font color="blue"><tt>Map Output Interval </tt></font> <font color="red"><tt>== </tt></font> <font color="black"><tt>600</tt></font> <font color="green"><tt>! Sets all map output interval to 600 seconds</tt></font>
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<font color="blue"><tt>HRTIF Map Output Interval </tt></font> <font color="red"><tt>== </tt></font> <font color="black"><tt>3600</tt></font> <font color="green"><tt>! Sets HR map output interval to 3600 seconds</tt></font>
The output resolution for high -resolution grid output is defined using the following .tcf command:
 
<font color="blue"><tt>HR Grid Output Cell Size </tt></font> <font color="red"><tt>== </tt></font> <font color="black"><tt>0.5</tt></font> <font color="green"><tt>! m or ft</tt></font>
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* “ON” (default): use face elevations in [[Check_Files_2d_DEM_Z_HR | _DEM_Z_HR]] check file. This option accurately shows the cell faces where water can be hydraulically blocked. However, when cell faces are angled with the thin breakline, this can create 'pockets' of lower elevations in the check file that do not exist in reality.
* “OFF”: Face elevations are not used in [[Check_Files_2d_DEM_Z_HR | _DEM_Z_HR]] check file. This is an useful option for report writing, as 'clean' high -resolution DEM images can be generated reflecting all geometry updates except for the Thin Breakline updates at cell faces.
 
[[File:HR_Z_Use_Face_Elevations_ON.PNG|480px]] [[File:HR_Z_Use_Face_Elevations_OFF.PNG|480px]]<br>
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