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Check Files 2d DEM Z: Difference between revisions

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This raster file contains the final elevations in the model,. itIt includes both 2D areas of the model and also 1D sections which utilise the 1D Water Level Line (1D mapping) functionality. When using SGS, this file contains a raster based on the SGS elevations used for the depth output interpolation (based on the <font color="blue"><tt>SGS Depth Output</font> <font color="red">==</tt></font> command).<br>
 
Output grid formats currently supported by TUFLOW include the ESRIGeoTIFF ASCII grid formatgrids (.asctif), binary grids (.flt) and geodeticESRI gridsASCII grid format (.tifasc). The .tcfpreferred commandformat <fontcan color="blue"><tt>Gridbe Formatset </tt></font>in <fontthe color="red"><tt>==</tt></font><tt>TUFLOW ASC</tt>Control File (.tcf) orusing: <font color="blue"><tt>Grid Format </tt></font> <font color="red"><tt>==</tt></font><tt> FLT</tt>TIF or| <fontFLT color="blue"><tt>Grid Format| ASC</tt></font>. <fontThe color="red"><tt>==</tt></font><tt>default TIF</tt>output canformat beis usedTIF. toAll setof thethese preferredformats outputare format.widely Therecognised default(QGIS, outputMapInfo, formatArcMap, asSMS TIFetc). The [[ASC_to_ASC#2023-03-AA_.28and_later.29 | asc_to_asc utility]] can be used to convert between ASC and TIF formats (in both directions).<br>▼
 
The cell size (resolution) of the DEM_Z check file (and all raster outputs from TUFLOW) can be set with the .tcf command: <font color="blue"><tt>Grid Output Cell Size </tt></font> <font color="red"><tt>==</tt></font><tt> <grid_cell_size></tt>. If this command is not set, the resolution defaults to:
* Half the smallest 2D cell size (TUFLOW Classic)
* Half the 2D cell size (TUFLOW HPC)
* Smallest 2D cell size (TUFLOW HPC with Quadtree)
 
This raster is aaligned north-south aligned raster and, so minor interpolation is required to display the TUFLOW model on this grid. To view the exact values at each point, use the [[Check_Files_2d_zpt | 2d_zpt]] check file, can be used. The _zpt_check filewhich is more suitedsuitable tofor viewing the values at individual zpts.<br>▼
 
The DEM_Z check file can be styled in your GIS software and youused can also performfor grid-based calculationcomparisons between simulations. For example when performing a flood impact assessment, the final elevation for the developed case can be compared to the existing case, to check the areas of cut and fill.▼
 
In the image below, a DEM_Z check file is shown. It has been styled as a hillshade so the final topography updates can be clearly seen. <br>
<br>
[[File:2d_DEM_Z_check_01a.png]]<br>
▲Output grid formats currently supported by TUFLOW include the ESRI ASCII grid format (.asc), binary grids (.flt) and geodetic grids (.tif). The .tcf command <font color="blue"><tt>Grid Format </tt></font> <font color="red"><tt>==</tt></font><tt> ASC</tt> or <font color="blue"><tt>Grid Format </tt></font> <font color="red"><tt>==</tt></font><tt> FLT</tt> or <font color="blue"><tt>Grid Format </tt></font> <font color="red"><tt>==</tt></font><tt> TIF</tt> can be used to set the preferred output format. The default output format as TIF. The [[ASC_to_ASC#2023-03-AA_.28and_later.29 | asc_to_asc utility]] can be used to convert between ASC and TIF (in both directions).<br>
<br>
Both of these formats are widely recognised (QGIS, MapInfo, ArcMap, SMS etc). The cell size of the DEM_Z check file (and all raster outputs from TUFLOW) can be set with the .tcf command:<br>
<font color="blue"><tt>Grid Output Cell Size </tt></font> <font color="red"><tt>==</tt></font><tt> <cell size in metres or feet></tt><br>
▲This raster is a north-south aligned raster and so minor interpolation is required to display the TUFLOW model on this grid. To view the exact values at each point the [[Check_Files_2d_zpt | 2d_zpt]] check file can be used. The _zpt_check file is more suited to viewing the values at individual zpts.<br>
<br>
▲The DEM_Z check file can be styled in your GIS software and you can also perform grid calculation between simulations. For example when performing a flood impact assessment, the final elevation for the developed case can be compared to the existing case, to check the areas of cut and fill.
<br>
 
In the image below the DEM_Z check file is shown for the [[FMA_Challenge_2 | FMA Challenge Model 2]] (this model can be downloaded and simulated at a range of cell sizes without a licence). It can be seen that it is easy to visualise the final elevations across the entire model to detect any anomalies.<br>
[[File:Check Files dem z 01.jpg]]
<br>
[[File:2d_DEM_Z_check_02a.png]]<br>
<br>
 
Back to [[TUFLOW_Check_Files | TUFLOW check files]].▼
 
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