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https://gitee.com/sunhf/gprMax.git
已同步 2025-08-06 20:46:52 +08:00
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4.5 KiB
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82 行
4.5 KiB
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.. _output:
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Output file
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gprMax produces an output file that has the same name as the input file but with ``.out`` appended. The output file uses the widely-supported HDF5 (https://www.hdfgroup.org/HDF5/) format which was designed to store and organize large amounts of numerical data.
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File structure
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==============
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The output file has the following HDF5 attributes at the root (``/``):
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* ``Title`` is the title of the model
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* ``Iterations`` is the number of iterations for the time window of the model
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* ``dx, dy, dz`` is a tuple containing the spatial discretisation, i.e. :math:`\Delta x`, :math:`\Delta y`, :math:`\Delta z`
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* ``dt`` is the time step of the model, i.e. :math:`\Delta t`
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* ``srcsteps`` is the spatial increment used to move all sources between model runs.
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* ``rxsteps`` is the spatial increment used to move all receivers between model runs.
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* ``ntx`` is the total number of sources in the model.
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* ``nrx`` is the total number of receievers in the model.
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The output file contains HDF5 groups for sources (``txs``) and receivers (``rxs``). Within each group are further groups that correspond to individual sources, e.g. ``tx1``, ``tx2`` etc..., and receivers, e.g. ``rx1``, ``rx2`` etc...
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.. code-block:: none
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/
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rxs/
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rx1/
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Position
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Ex
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Ey
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Ez
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Hx
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Hy
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Hz
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rx2/
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...
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txs/
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tx1/
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Position
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tx2/
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...
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Within each individual ``rx`` group are the following datasets:
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* ``Position`` is the x, y, z position (in metres) of the receiver in the model.
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* ``Ex`` is an array containing the time history (for the model time window) of the values of the x component of the electric field at that receiver position.
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* ``Ey`` is an array containing the time history (for the model time window) of the values of the y component of the electric field at that receiver position.
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* ``Ez`` is an array containing the time history (for the model time window) of the values of the z component of the electric field at that receiver position.
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* ``Hx`` is an array containing the time history (for the model time window) of the values of the x component of the magnetic field at that receiver position.
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* ``Hy`` is an array containing the time history (for the model time window) of the values of the y component of the magnetic field at that receiver position.
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* ``Hz`` is an array containing the time history (for the model time window) of the values of the z component of the magnetic field at that receiver position.
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Within each individual ``tx`` group is the following dataset:
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* ``Position`` is the x, y, z position (in metres) of the receiver in the model.
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Viewing output
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==============
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There are a number of free tools available to read HDF5 files. Also MATLAB has high- and low-level functions for reading and writing HDF5 files, i.e. ``h5info`` and ``h5disp`` are useful for returning information and displaying the contents of HDF5 files respectively. gprMax includes some Python modules (in the ``tools`` package) to help you view output data:
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A-scans
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-------
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* Plot A-scans using the Python module ``plot_Ascan_hdf5.py``. The module uses matplotlib to plot the time history for the electric and magnetic field components for all receivers in a model (each receiver gets a separate figure window). Usage (from the top-level gprMax directory) is: ``python -m tools.plot_Ascan_hdf5 my_outputfile.out``.
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* Plot A-scans using the MATLAB script ``plot_Ascan_hdf5.m``. The script plots the time history for the electric and magnetic field components for all receivers in a model (each receiver gets a separate figure window).
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B-scans
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-------
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gprMax produces a separate output file for each trace (A-scan) in the B-scan.
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* Combine the separate output files into one file using the Python module ``outputfiles_mergehdf5.py``. Usage (from the top-level gprMax directory) is: ``python -m tools.outputfiles_mergehdf5 basefilename modelruns``, where ``basefilename`` is the base name file of the output file series, e.g. for ``myoutput1.out``, ``myoutput2.out`` the base file name would be ``myoutput``, and ``modelruns`` is the number of output files to combine.
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* Plot an image of the B-scan using the Python module ``plot_Bscan_hdf5.py``. Usage (from the top-level gprMax directory) is: ``python -m tools.plot_Bscan_hdf5 my_outputfile.out field``, where ``field`` is the name of field to plot, e.g. ``Ex``, ``Ey`` or ``Ez``.
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