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GRID to GRID draft: Difference between revisions

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=Introduction=
The grid_to_grid.exe is a utility that can be used to perform a range of operations on gridded files. The input grids can be a combination of GeoTIFF (.tif), ESRI ASCII (.asc), binary float (.flt) geopackage (.gpkg), NetCDF (.nc) and Cloud Optimised GeoTIFFs (.cog) grids, all of which can be input and output from TUFLOW and any of the format can be set as output from the utility.<br>
For some options (such as processing maximums or differences) the input files must be of the same row/column dimensions.<br>
 
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==Flood Extent==
'''"-wl <wl_file>fe"'''<br>▼
Returns a simple grid with value of 1 where the input grid has an active, non-zero value.<br>
Example:
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==Remap==
'''"-wl <wl_file> -dem <dem_file>"'''<br>▼
RemapRemaps acoarser resolution water level grid to a higherfiner resolution DEM.<br>
▲'''"-wl <wl_file>"'''<br>
Sets the coarser resolution water level grid to remap from.<br>
▲'''"-dem <dem_file>"'''<br>
Sets the finer resolution DEM.<br>
The default interpolation method is TIN. But "-idw_npt<number of points>" flag can be used to change the interpolation method to IDW and set the number of points used for IDW interpolation (default is 12).<br>
Example:
*TheRemaps utilitywater canlevel also remap additional map output grids (e.g. velocity, hazard and others)grid to the resolution of the DEM file, e.g.:<br>
:<tt>grid_to_grid.exe -remap -wl lowres_h.tif -dem DEM_highres.tif</tt>
*The utility can also applyremap adepth bufferoutput distancegrids or add freeboard. For example,to the below applies a buffer distanceresolution of 20m, and adds a freeboard of 0.2m to the original water levelDEM grid.file:<br>
:<tt>grid_to_grid.exe -remap -wl lowres_h.tif -dem DEM_highres.tif lowres_v.tif lowres_hazardlowres_d.tif</tt>
*The utility can also apply a buffer distance or add a freeboard. The below applies a buffer distance of 20m, and adds a freeboard of 0.2m to the original water level grid.<br>
:<tt>grid_to_grid.exe -remap -fb0.2 -bd20 -wl lowres_h.tif -dem DEM_highres.tif</tt>
 
Note that, for any output types other than depth, this utility does NOT interpolate the result from the coarser grid to the finer grid, but only extends/reduces the output extent to the dry/wet extent. More discussions on this function is documented here <u>[[TUFLOW_Remapping | TUFLOW Remapping Tool]]</u>.<br>
 
 
=GPKG and NetCDF=
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