GRID to GRID draft: Difference between revisions

*Converts the file "DEM.asc" to.flt format.<br>

:<tt>grid_to_grid.exe -conv -flt DEM.asc</tt>

:<tt>grid_to_grid.exe -conv -tif DEM_M01.asc -co COMPRESS=LZW -co PREDICTOR=2</tt>

* Converts GeoTIFF to a Cloud Optimised GeoTIFF. Requires <tt>-out</tt> flag since the extension for COG is also .tif and the default output file would be the same as the input file.<br>

Examples:<br>

*Creates a new grid containing the maximum of the 3 input water level grids.<br>

*Wildcard character "*" is supported in filenames.<br>

* Runs a maximum operation on all FLT grids in a given location and outputs to a GeoPackage raster.<br>

:<tt>grid_to_grid.exe -max -out "output_grids.gpkg >> maximum_h" *.flt</tt>

*A second grid with a “_wd” suffix is output to indicate which .asc grid cells were once wet and are now dry (value -99) or once dry and are now wet (value +99 with first .asc to be the developed case and second .asc to be the existing case). Importing this grid into Vertical Mapper creates a .grc (grid classification) grid that has two categories: “Was Wet Now Dry” and “Was Dry Now Wet”. This grid is particularly useful for displaying areas that were previously inundated or previously flood-free.<br>

Example:

*Runs a difference operation on GeoTIFF outputs.<br>

:<tt>grid_to_grid.exe -dif proposed.tif existing.tif</tt>

Examples:

*Creates a new depth grid only where the depth is greater than 0.1m.<br>

*Creates a new level grid only where the depth is greater than 0.1m.<br>

 

==Resize==

This is the defualt processing method, which can also be specified with the '''-rm_avg''' (resize method - average) input flag. When processing for each tile in the new grid, the average of all non-null values in the input grid is taken. For example with a resize factor of 5, the 25 values in the input grid are averaged.<br>

Example:

 

===Minimum===

Alternative processing method for resize, specified with the '''-rm_min''' (resize method - minimum) flag. At each output grid the values is the minimum of the values in the input grid.<br>

Example:

 

===Maximum===

Alternative processing method for resize, specified with the '''-rm_max''' (resize method - maximum) flag. At each output grid the values is the maximum of the values in the input grid.<br>

Example:

 

==Transform==

Examples:

*Multiplies all values by 0.3048.<br>

*Multiplies all values by 0.3048 and then adds 10.0.<br>

 

==Decimal==

Example:

 

==Classify==

{| class="wikitable"

 

Examples:

*Outputs a classified grid, based on the cut off values and names in the "classifications.csv".<br>

 

:{| class="wikitable"

'''NOTE:''' For the output GIS file, the '''dz''' attribute is set to 0.0 regardless of the value set in the input field. <br>

Example:

*<tt>grid_to_grid.exe -brkline 2d_zsh_breaklines_L.gpkg DEM.tif</tt>

 

|Above 5.0|| Above 5.0 || 973 || 0.06

|}

 

==Extract 1D Model Inputs==

==Calibration Points==

'''"-cp <cp_file>"'''<br>

'''"-config <config_file>"''' (optional)<br>

Points to a csv file containing accuracy thresholds and style control options, e.g. symbol, colour and size.<br>

The second search radius used to search for maximum and minimum values in meters.<br>

Example usage:

 

==Statistics==

<big>'''"-stat<type>"'''</big>

 

The available options are:

* An SRC grid: a grid listing which source input grid the median result value came from (a corresponding .csv file is also written as a legend)<br>

Example usage:

 

[[File: asc_to_asc_statsMedian_eg.PNG|1000px|]]<br>

* An SRC grid: a grid listing which source input grid the result value came from or was the next above (a corresponding .csv file is also written as a legend)<br>

Example usage:

 

==="-statFrac"===

* A Frac grid: the resulting Fraction value<br>

Example usage:

 

==="-statMin"===

* An SRC grid: a grid listing which source input grid the minimum result value came from (a corresponding .csv file is also written as a legend)<br>

Example usage:

 

==="-statMax"===

* An SRC grid: a grid listing which source input grid the maximum result value came from (a corresponding .csv file is also written as a legend)<br>

Example usage:

 

==="-statAll"===

* A .csv file that contains the legend for all SRC grids<br>

Example usage:

 

==="-statRank<integer id>"===

* An SRC grid: a grid listing which source input grid the ranked result value came from (a corresponding .csv file is also written as a legend)<br>

Example usage:

 

==Flood Extent==

Returns a simple grid with value of 1 where the input grid has an active, non-zero value.<br>

Example usage:

 

==Remap==

Examples:

*The utility can also remap additional map output grids (e.g. velocity, hazard and others) to the resolution of the DEM file, e.g.<br>

*The utility can also apply a buffer distance or add freeboard. For example, the below applies a buffer distance of 20m, and adds a freeboard of 0.2m to the original water level grid.<br>

 

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 [[TUFLOW_Remapping | TUFLOW Remapping Tool]].<br>