DAT to DAT

This pages is being updated to include the latest version of the utility which supports .xmdf format resutls

=Introduction= We are currently working on an updated version of the dat_to_dat utility which includes support for the XMDF file type. This page will be updated when this is complete.

Operations

This section of the con table below contains a list of operation the utility can perform. Additional input options are included in the next section. One of the operations from this section must be included in the input argument.

Max

Input Switch: -max
Description
This can be used to extract the maximum from a number of input datasets. Any number of input files can be specified. If a maximum folder exists in an .xmdf file for the type specified, this dataset will be used, for dat files use -t99999 to use the maximum data in the .dat file.
Examples


1. dat_to_dat.exe -max results_1_h.dat results_2_h.dat results_3_h.dat
Extracts the maximum water level from the three .dat files.
2. dat_to_dat.exe -max -typeH results_1.xmdf results_2.xmdf results_3.xmdf
As above but for results stored in xmdf file format.

Difference

Input Switch: -dif
Description
This can be used to compare two datasets. If a third files is specified, the third file is used as the output file. The output filename can also be specified with the -out option. The output is the first results minus the second result file.
A special wet/dry algorithm is used. If water level results are not specified (_h.dat or -typeH), the algorithm opens these files, as well as opens the .2dm file associated with the results files, and uses the water levels and ZH Zpt values (for 2D cells) and elevations at the WLL triangle corners to determine whether a node (corner of an mesh element) is wet or dry. This allows two special values to be output in the event that a node is dry in one results file and wet in the other or vica versa. A value of 99 is used to indicate that a node is dry in the first results file, but is flooded in the second resuilts file, while +99 indicates that the node was wet in the first results file but is dry in the second results file. Specifying -nowetdry does not carry out a wet/dry check using the water level results.
The -t option can be used to carry out the difference at a particular time (rather than all times). The most common time is to take the difference at the flood peak, ie. specify t99999.
Examples


3. dat_to_dat.exe -dif results_developed_h.dat results_existing_h.dat
Extracts the difference in water level, the output is results_developed_h - results_existing_h for all timesteps.
4. dat_to_dat.exe -dif -typeH -nowetdry results_developed.xmdf results_existing.xmdf
Extracts the difference in water level for the maximum water level and suppresses the wet/dry check described above.

Duration

Input Switch: -dur<cut of value>
Description
Determines the duration in hours that the the results exceed the cut of value.
Note: A preferable approach is to use the .tcf file command: Time Output Cutoff Depths == <cut of value or values>. With this command specified TUFLOW tracks this on a timestep by timestep basis rather than post processing this at the map output interval.
Examples


5. dat_to_dat.exe -dur0.1 -typeD results.xmdf
Extracts the duration in flooding above 0.1m deep.

Keep

Input Switch: -k<output time>
Description
Can be used to extract a single timestep from a results file. This is useful to extract the maximums to a separate file making it easier to transfer electronically. To keep a range of output times see the -range option below.
Examples


6. dat_to_dat.exe -k99999 results_h.dat
Creates a new results file containing just the maximum from the water level results.
7. dat_to_dat.exe -k2.5 -typeV results.xmdf
Creates a new results file containing just velocity results for the 2.5 hour output.

Range

Input Switch: -rangeA<start time> -rangeB<end time>
Description
Extracts all timestep between start time and end time (inclusive) into a separate results file.
Examples


8. dat_to_dat.exe -rangeA1 -rangeB2.5 results_q.dat
Creates a new results file containing the outputs between 1.0 and 2.5 hours. Both 1 and 2.5 hour outputs are included.
9. dat_to_dat.exe -rangeA1 -rangeB2.5 results.xmdf
As above but for xmdf input files.

Remove

Input Switch: -r<output time>
Description
Creates a new output file and removes the output time from this.
Examples


10. dat_to_dat.exe -r3 results_d.dat
Creates a new output file which does not include the output at 3.

Trim Values

Input Switch: -trim<value>
Description
Creates a new output file which has any values above <value> set to <value>. If the input is a vector data, the vector magnitude is used to trim the value (direction is unchanged).
Examples


11. dat_to_dat.exe -trim5 -typeV results.xmdf
Creates a new output of velocity with any outputs greater than 5.0 set to 5.0.

Times

Input Switch: -times
Description
Creates a text file which contains the output times in the .dat or xmdf file. If no output filename is specified with the -out option the output file will be called "times.txt". For xmdf files see also the -xnfo option below.
Examples


12. dat_to_dat.exe -times results_h.dat
Creates an an output file "times.txt" which contains all timesteps that are contained in the results file.

XMDF Information

Input Switch: -xnfo
Description
Creates a text file which contains a list of the datasets contained within the .xmdf file. The number of output times and the output times are also exported to the text file.
Examples


13. dat_to_dat.exe -xnfo -out xmdf_info.txt results.xmdf
Creates an an output file with the specified filename "xmdf_info.txt", which contains information about the contents of the xmdf file.

Velocity Angle

Input Switch: -va
Description


Examples


Concatenate

Input Switch: -con
Description


Examples


Convert

Input Switch: -conv
Description


Examples


Ensight (beta)

Input Switch: -ensight
Description


Examples


General Options

For examples on the current dat_to_dat utility please see section 11.3 of the 2010 TUFLOW manual.

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