Difference between revisions of "TUFLOW HR Output"

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High-resolution grid outputs are also supported by HPC and Quadtree Output Zones. For example:
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HR outputs are supported by HPC and Quadtree Output Zones. Below is an example of tcf commands to set up HR output in a output zone:
Model Output Zones == ZoneA
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<font color="blue"><tt>Model Output Zones</tt></font> <font color="red"><tt>==</tt></font> <font color="black"><tt>ZoneA</tt></font><br>
 +
<font color="blue"><tt>Define Output Zone</tt></font> <font color="red"><tt>==</tt></font> <font color="black"><tt>ZoneA</tt></font>
 +
    <font color="blue"><tt>Read GIS Output Zone</tt></font> <font color="red"><tt>==</tt></font> <font color="black"><tt>..\model\gis\2d_oz_S05_002_R.shp</tt></font>
 +
    <font color="blue"><tt>Write Check Files INCLUDE</tt></font> <font color="red"><tt>==</tt></font> <font color="black"><tt>dem_Z</tt></font> <font color="green"><tt>! includes only dem_Z check file for this output zone</tt></font>
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    <font color="blue"><tt>Map Output Format</tt></font> <font color="red"><tt>==</tt></font> <font color="black"><tt>HRTIF</tt></font>
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    <font color="blue"><tt>HRFLT Map Output Data Types</tt></font> <font color="red"><tt>==</tt></font> <font color="black"><tt>h d</tt></font>
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    <font color="blue"><tt>HRFLT Map Output Interval</tt></font> <font color="red"><tt>==</tt></font> <font color="black"><tt>3600</tt></font>
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    <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>
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<font color="blue"><tt>End Define</tt></font>
  
Define Output Zone == ZoneA
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If HR output is defined in the Map Output Format, a high-resolution DEM_Z check file (DEM_Z_HR) is produced instead of the DEM_Zmin check file.
    Read GIS Output Zone == ..\model\gis\2d_oz_S05_002_R.shp
 
    Write Check Files INCLUDE == dem_Z
 
    Map Output Format == HRFLT
 
    HRFLT Map Output Data Types == h d ZPA
 
    HRFLT Map Output Interval == 0         
 
    HR Grid Output Cell Size == 0.5
 
End Define
 
If either HRASC or HRFLT are defined in the Map Output Format, then a high-resolution DEM_Z check file (DEM_Z_HR) is produced instead of the DEM_Zmin check file for the whole model or output zone that high resolution output has been specified for.
 
  
 
=Water Level Interpolation Method=
 
=Water Level Interpolation Method=

Revision as of 12:10, 20 February 2024

Page Under Construction


Introduction

High Resolution (HR) Grid/Raster Map Outputs was first introduced in TUFLOW 2020-10-AB release. When an SGS model uses “SGS Approach == Method C”, 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.

Sgs std output.png Sgs hr output.png

The advantage of the HR output is that it can retain the sub-grid detail of the terrain information even at coarse cell size. As compared in the example below, the HR depth output shows clear flow path even at 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 must be conducted based on the standard map output, and the HR output should be used for presentation purpose only.

Sgs std vs hr output.png

Enable High Resolution Output

To produce high-resolution output, add “HRASC”, “HRFLT” or “HRTIF” to the “Map Output Format ==” command, for example:

Map Output Format == XMDF TIF HRTIF

At the moment, only water level and depth are supported as the High Resolution Output formats, i.e.:

HRTIF Map Output Data Types == h d

The map output data types and output interval can be defined separately for the High Resolution Output formats. For example:

Map Output Interval == 600 ! Sets all map output interval to 600 seconds

HRTIF Map Output Interval == 3600 ! Sets HR map output interval to 3600 seconds

The output resolution for high resolution grid output is defined using the following .tcf command:

HR Grid Output Cell Size == 0.5 ! m or ft

If this command is omitted, the default output resolution is set as the SGS sampling distance.


HR outputs are supported by HPC and Quadtree Output Zones. Below is an example of tcf commands to set up HR output in a output zone:

Model Output Zones == ZoneA
Define Output Zone == ZoneA Read GIS Output Zone == ..\model\gis\2d_oz_S05_002_R.shp Write Check Files INCLUDE == dem_Z ! includes only dem_Z check file for this output zone Map Output Format == HRTIF HRFLT Map Output Data Types == h d HRFLT Map Output Interval == 3600 HR Grid Output Cell Size == 0.5 End Define

If HR output is defined in the Map Output Format, a high-resolution DEM_Z check file (DEM_Z_HR) is produced instead of the DEM_Zmin check file.

Water Level Interpolation Method

interpolated from the surrounding SGS sampled elevations.

  • under construction

Interpolation near Thin Breakline

  • under construction

Interpolation for Sheet Flow

  • under construction


Any further questions please email TUFLOW support: support@tuflow.com


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