View source for Check Files 2d DEM M

This raster file contains the final material ID values used in the model. It includes both 2D areas of the model and 1D sections which utilise the 1D Water Level Line (1D mapping) functionality.  <br>
'''Note:''' If the material land use functionality is not used (e.g. the legacy command: "<font color="blue"><tt>Set CnM </tt></font> <font color="red"><tt>==</tt></font><tt> 0.035</tt>"), this file may contain zero values. <br>

Output grid formats currently supported by TUFLOW include GeoTIFF grids (.tif), binary grids (.flt) and ESRI ASCII grid format (.asc). The preferred format can be set in the TUFLOW Control File (.tcf) using: <font color="blue"><tt>Grid Format </tt></font> <font color="red"><tt>==</tt></font><tt> TIF | FLT | ASC</tt>. The default output format is TIF. All of these formats are widely recognised (QGIS, MapInfo, ArcMap, SMS etc). 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 of the DEM_M 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> <grid_cell_size></tt><br>

This raster is aligned north-south, so minor interpolation is required to display the TUFLOW model on this grid. To view the exact values at the cell side points, use the [[Check_Files_2d_uvpt | 2d_uvpt]] check file, which is more suitable for viewing the values at individual cells.  Whilst the DEM_M is useful for quickly checking large areas.<br>

The DEM_M check file can be styled in GIS software and used for grid-based comparisons between simulations.  

The image below shows the spatial distribution of land use represented in the DEM_M check file. The layer has been styled based on the material ID values.<br>
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[[File:2d_DEM_M_check_01a.png]]<br>
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