"""
Module to read MODFLOW output files. The module contains shared
abstract classes that should not be directly accessed.
"""
import numpy as np
[docs]class LayerFile:
"""
The LayerFile class is the abstract base class from which specific derived
classes are formed. LayerFile This class should not be instantiated
directly.
"""
def __init__(self, filename, precision, verbose, kwargs):
from ..discretization.structuredgrid import StructuredGrid
self.filename = filename
self.precision = precision
self.verbose = verbose
self.file = open(self.filename, "rb")
# Get filesize to ensure this is not an empty file
self.file.seek(0, 2)
totalbytes = self.file.tell()
self.file.seek(0, 0) # reset to beginning
assert self.file.tell() == 0
if totalbytes == 0:
raise ValueError(f"datafile error: file is empty: {filename}")
self.nrow = 0
self.ncol = 0
self.nlay = 0
self.times = []
self.kstpkper = []
self.recordarray = []
self.iposarray = []
if precision == "single":
self.realtype = np.float32
elif precision == "double":
self.realtype = np.float64
else:
raise Exception(f"Unknown precision specified: {precision}")
self.model = None
self.dis = None
self.mg = None
if "model" in kwargs.keys():
self.model = kwargs.pop("model")
self.mg = self.model.modelgrid
self.dis = self.model.dis
if "dis" in kwargs.keys():
self.dis = kwargs.pop("dis")
self.mg = self.dis.parent.modelgrid
if "modelgrid" in kwargs.keys():
self.mg = kwargs.pop("modelgrid")
if len(kwargs.keys()) > 0:
args = ",".join(kwargs.keys())
raise Exception(f"LayerFile error: unrecognized kwargs: {args}")
# read through the file and build the pointer index
self._build_index()
# now that we read the data and know nrow and ncol,
# we can make a generic mg if needed
if self.mg is None:
self.mg = StructuredGrid(
delc=np.ones((self.nrow,)),
delr=np.ones(
self.ncol,
),
nlay=self.nlay,
xoff=0.0,
yoff=0.0,
angrot=0.0,
)
return
[docs] def to_shapefile(
self,
filename,
kstpkper=None,
totim=None,
mflay=None,
attrib_name="lf_data",
):
"""
Export model output data to a shapefile at a specific location
in LayerFile instance.
Parameters
----------
filename : str
Shapefile name to write
kstpkper : tuple of ints
A tuple containing the time step and stress period (kstp, kper).
These are zero-based kstp and kper values.
totim : float
The simulation time.
mflay : integer
MODFLOW zero-based layer number to return. If None, then layer 1
will be written
attrib_name : str
Base name of attribute columns. (default is 'lf_data')
Returns
----------
None
See Also
--------
Notes
-----
Examples
--------
>>> import flopy
>>> hdobj = flopy.utils.HeadFile('test.hds')
>>> times = hdobj.get_times()
>>> hdobj.to_shapefile('test_heads_sp6.shp', totim=times[-1])
"""
plotarray = np.atleast_3d(
self.get_data(
kstpkper=kstpkper, totim=totim, mflay=mflay
).transpose()
).transpose()
if mflay != None:
attrib_dict = {f"{attrib_name}{mflay}": plotarray[0, :, :]}
else:
attrib_dict = {}
for k in range(plotarray.shape[0]):
name = f"{attrib_name}{k}"
attrib_dict[name] = plotarray[k]
from ..export.shapefile_utils import write_grid_shapefile
write_grid_shapefile(filename, self.mg, attrib_dict)
[docs] def plot(
self,
axes=None,
kstpkper=None,
totim=None,
mflay=None,
filename_base=None,
**kwargs,
):
"""
Plot 3-D model output data in a specific location
in LayerFile instance
Parameters
----------
axes : list of matplotlib.pyplot.axis
List of matplotlib.pyplot.axis that will be used to plot
data for each layer. If axes=None axes will be generated.
(default is None)
kstpkper : tuple of ints
A tuple containing the time step and stress period (kstp, kper).
These are zero-based kstp and kper values.
totim : float
The simulation time.
mflay : int
MODFLOW zero-based layer number to return. If None, then all
all layers will be included. (default is None)
filename_base : str
Base file name that will be used to automatically generate file
names for output image files. Plots will be exported as image
files if file_name_base is not None. (default is None)
**kwargs : dict
pcolor : bool
Boolean used to determine if matplotlib.pyplot.pcolormesh
plot will be plotted. (default is True)
colorbar : bool
Boolean used to determine if a color bar will be added to
the matplotlib.pyplot.pcolormesh. Only used if pcolor=True.
(default is False)
contour : bool
Boolean used to determine if matplotlib.pyplot.contour
plot will be plotted. (default is False)
clabel : bool
Boolean used to determine if matplotlib.pyplot.clabel
will be plotted. Only used if contour=True. (default is False)
grid : bool
Boolean used to determine if the model grid will be plotted
on the figure. (default is False)
masked_values : list
List of unique values to be excluded from the plot.
file_extension : str
Valid matplotlib.pyplot file extension for savefig(). Only used
if filename_base is not None. (default is 'png')
Returns
----------
None
See Also
--------
Notes
-----
Examples
--------
>>> import flopy
>>> hdobj = flopy.utils.HeadFile('test.hds')
>>> times = hdobj.get_times()
>>> hdobj.plot(totim=times[-1])
"""
if "file_extension" in kwargs:
fext = kwargs.pop("file_extension")
fext = fext.replace(".", "")
else:
fext = "png"
masked_values = kwargs.pop("masked_values", [])
if self.model is not None:
if hasattr(self.model, "bas6") and self.model.bas6 is not None:
masked_values.append(self.model.bas6.hnoflo)
kwargs["masked_values"] = masked_values
filenames = None
if filename_base is not None:
if mflay is not None:
i0 = int(mflay)
if i0 + 1 >= self.nlay:
i0 = self.nlay - 1
i1 = i0 + 1
else:
i0 = 0
i1 = self.nlay
filenames = [
f"{filename_base}_Layer{k + 1}.{fext}" for k in range(i0, i1)
]
# make sure we have a (lay,row,col) shape plotarray
plotarray = np.atleast_3d(
self.get_data(
kstpkper=kstpkper, totim=totim, mflay=mflay
).transpose()
).transpose()
from ..plot.plotutil import PlotUtilities
return PlotUtilities._plot_array_helper(
plotarray,
model=self.model,
axes=axes,
filenames=filenames,
mflay=mflay,
modelgrid=self.mg,
**kwargs,
)
def _build_index(self):
"""
Build the recordarray and iposarray, which maps the header information
to the position in the formatted file.
"""
raise Exception(
"Abstract method _build_index called in LayerFile. "
"This method needs to be overridden."
)
[docs] def list_records(self):
"""
Print a list of all of the records in the file
obj.list_records()
"""
for header in self.recordarray:
print(header)
return
def _get_data_array(self, totim=0):
"""
Get the three dimensional data array for the
specified kstp and kper value or totim value.
"""
if totim >= 0.0:
keyindices = np.where((self.recordarray["totim"] == totim))[0]
if len(keyindices) == 0:
msg = f"totim value ({totim}) not found in file..."
raise Exception(msg)
else:
raise Exception("Data not found...")
# initialize head with nan and then fill it
idx = keyindices[0]
nrow = self.recordarray["nrow"][idx]
ncol = self.recordarray["ncol"][idx]
data = np.empty((self.nlay, nrow, ncol), dtype=self.realtype)
data[:, :, :] = np.nan
for idx in keyindices:
ipos = self.iposarray[idx]
ilay = self.recordarray["ilay"][idx]
if self.verbose:
msg = f"Byte position in file: {ipos} for layer {ilay}"
print(msg)
self.file.seek(ipos, 0)
nrow = self.recordarray["nrow"][idx]
ncol = self.recordarray["ncol"][idx]
shp = (nrow, ncol)
data[ilay - 1] = self._read_data(shp)
return data
[docs] def get_times(self):
"""
Get a list of unique times in the file
Returns
----------
out : list of floats
List contains unique simulation times (totim) in binary file.
"""
return self.times
[docs] def get_kstpkper(self):
"""
Get a list of unique stress periods and time steps in the file
Returns
----------
out : list of (kstp, kper) tuples
List of unique kstp, kper combinations in binary file. kstp and
kper values are presently zero-based.
"""
kstpkper = []
for kstp, kper in self.kstpkper:
kstpkper.append((kstp - 1, kper - 1))
return kstpkper
[docs] def get_data(self, kstpkper=None, idx=None, totim=None, mflay=None):
"""
Get data from the file for the specified conditions.
Parameters
----------
idx : int
The zero-based record number. The first record is record 0.
kstpkper : tuple of ints
A tuple containing the time step and stress period (kstp, kper).
These are zero-based kstp and kper values.
totim : float
The simulation time.
mflay : integer
MODFLOW zero-based layer number to return. If None, then all
all layers will be included. (Default is None.)
Returns
----------
data : numpy array
Array has size (nlay, nrow, ncol) if mflay is None or it has size
(nrow, ncol) if mlay is specified.
See Also
--------
Notes
-----
if both kstpkper and totim are None, will return the last entry
Examples
--------
"""
# One-based kstp and kper for pulling out of recarray
if kstpkper is not None:
kstp1 = kstpkper[0] + 1
kper1 = kstpkper[1] + 1
idx = np.where(
(self.recordarray["kstp"] == kstp1)
& (self.recordarray["kper"] == kper1)
)
if idx[0].shape[0] == 0:
raise Exception(
f"get_data() error: kstpkper not found:{kstpkper}"
)
totim1 = self.recordarray[idx]["totim"][0]
elif totim is not None:
totim1 = totim
elif idx is not None:
totim1 = self.recordarray["totim"][idx]
else:
totim1 = self.times[-1]
data = self._get_data_array(totim1)
if mflay is None:
return data
else:
return data[mflay, :, :]
[docs] def get_alldata(self, mflay=None, nodata=-9999):
"""
Get all of the data from the file.
Parameters
----------
mflay : integer
MODFLOW zero-based layer number to return. If None, then all
all layers will be included. (Default is None.)
nodata : float
The nodata value in the data array. All array values that have the
nodata value will be assigned np.nan.
Returns
----------
data : numpy array
Array has size (ntimes, nlay, nrow, ncol) if mflay is None or it
has size (ntimes, nrow, ncol) if mlay is specified.
See Also
--------
Notes
-----
Examples
--------
"""
rv = []
for totim in self.times:
h = self.get_data(totim=totim, mflay=mflay)
rv.append(h)
rv = np.array(rv)
rv[rv == nodata] = np.nan
return rv
def _read_data(self, shp):
"""
Read data from file
"""
raise Exception(
"Abstract method _read_data called in LayerFile. "
"This method needs to be overridden."
)
def _build_kijlist(self, idx):
if isinstance(idx, list):
kijlist = idx
elif isinstance(idx, tuple):
kijlist = [idx]
else:
raise Exception("Could not build kijlist from ", idx)
# Check to make sure that k, i, j are within range, otherwise
# the seek approach won't work. Can't use k = -1, for example.
for k, i, j in kijlist:
fail = False
if k < 0 or k > self.nlay - 1:
fail = True
if i < 0 or i > self.nrow - 1:
fail = True
if j < 0 or j > self.ncol - 1:
fail = True
if fail:
raise Exception(
"Invalid cell index. Cell {} not within model grid: "
"{}".format((k, i, j), (self.nlay, self.nrow, self.ncol))
)
return kijlist
def _get_nstation(self, idx, kijlist):
if isinstance(idx, list):
return len(kijlist)
elif isinstance(idx, tuple):
return 1
def _init_result(self, nstation):
# Initialize result array and put times in first column
result = np.empty((len(self.times), nstation + 1), dtype=self.realtype)
result[:, :] = np.nan
result[:, 0] = np.array(self.times)
return result
[docs] def close(self):
"""
Close the file handle.
"""
self.file.close()
return