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geogrid.py
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geogrid.py
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'''Module with classes and methods to analyse and process exported geomodel grids
Created on 21/03/2014
@author: Florian Wellmann (some parts originally developed by Erik Schaeffer)
'''
import numpy as np
#import pynoddy
import subprocess
import os.path
import platform
try:
import matplotlib.pyplot as plt
except ImportError:
print("\n\n\tMatplotlib not installed - plotting functions will not work!\n\n\n")
# import mpl_toolkits
# from matplotlib.ticker import MultipleLocator, FormatStrFormatter
# to convert python variable types to cpp types
import ctypes
# to create array
from numpy.ctypeslib import ndpointer
# to create folder
import os
import pyvista as pv
# read out and change xml file (here only used to read out model boundary information)
import geomodeller_xml_obj as GO
class GeoGrid():
"""Object definition for exported geomodel grids"""
def __init__(self, **kwds):
"""GeoGrid contains methods to load, analyse, and process exported geomodel grids
**Optional Keywords**:
- *grid_filename* = string : filename of exported grid
- *delxyz_filename* = string : file with model discretisation
- *dimensions_filename* = string : file with model dimension (coordinates)
"""
if 'grid_filename' in kwds:
self.grid_filename = kwds['grid_filename']
if 'delxyz_filename' in kwds:
self.delxyz_filename = kwds['delxyz_filename']
if 'dimensions_filename' in kwds:
self.dimensions_filename = kwds['dimensions_filename']
def __add__(self, G_other):
"""Combine grid with another GeoGrid if regions are overlapping"""
# check overlap
print (self.ymin, self.ymax)
print (G_other.ymin, G_other.ymax)
if (G_other.ymin < self.ymax and G_other.ymin > self.ymin):
print("Grids overlapping in y-direction between %.0f and %.0f" %
(G_other.ymin, self.ymax))
def load_grid(self):
"""Load exported grid, discretisation and dimensions from file"""
if not hasattr(self, 'grid_filename'):
raise AttributeError("Grid filename is not defined!")
self.grid = np.loadtxt(self.grid_filename,
delimiter = ',',
dtype='int',
unpack=False)
if hasattr(self, 'delxyz_filename'):
self.load_delxyz(self.delxyz_filename)
self.adjust_gridshape()
if hasattr(self, 'dimensions_filename'):
self.load_dimensions(self.dimensions_filename)
def load_delxyz(self, delxyz_filename):
"""Load grid discretisation from file"""
del_lines = open(delxyz_filename, 'r').readlines()
d0 = del_lines[0].split("*")
self.delx = np.array([float(d0[1]) for _ in range(int(d0[0]))])
d1 = del_lines[1].split("*")
self.dely = np.array([float(d1[1]) for _ in range(int(d1[0]))])
d2 = del_lines[2].split(",")[:-1]
self.delz = np.array([float(d) for d in d2])
(self.nx, self.ny, self.nz) = (len(self.delx), len(self.dely), len(self.delz))
(self.extent_x, self.extent_y, self.extent_z) = (sum(self.delx), sum(self.dely), sum(self.delz))
def set_delxyz(self, delxyz):
"""Set delx, dely, delz arrays explicitly and update additional attributes
**Arguments**:
- *delxyz* = (delx-array, dely-array, delz-array): arrays with cell dimensions
"""
self.delx, self.dely, self.delz = delxyz
(self.nx, self.ny, self.nz) = (len(self.delx), len(self.dely), len(self.delz))
(self.extent_x, self.extent_y, self.extent_z) = (sum(self.delx), sum(self.dely), sum(self.delz))
def set_basename(self, name):
"""Set basename for grid exports, etc.
**Arguments**:
- *name* = string: basename
"""
self.basename = name
def load_dimensions(self, dimensions_filename):
"""Load project dimensions from file"""
dim = [float(d) for d in open(dimensions_filename, 'r').readlines()[1].split(",")]
(self.xmin, self.xmax, self.ymin, self.ymax, self.zmin, self.zmax) = dim
# calculate cell centre positions in real world coordinates
def define_regular_grid(self, nx, ny, nz):
"""Define a regular grid from defined project boundaries and given discretisations"""
self.nx = nx
self.ny = ny
self.nz = nz
self.delx = np.ones(nx) * (self.xmax - self.xmin) / nx
self.dely = np.ones(ny) * (self.ymax - self.ymin) / ny
self.delz = np.ones(nz) * (self.zmax - self.zmin) / nz
# create (empty) grid object
self.grid = np.ndarray((nx, ny, nz))
# update model extent
(self.extent_x, self.extent_y, self.extent_z) = (sum(self.delx), sum(self.dely), sum(self.delz))
def define_irregular_grid(self, delx, dely, delz):
"""Set irregular grid according to delimter arrays in each direction"""
self.delx = delx
self.dely = dely
self.delz = delz
self.nx = len(delx)
self.ny = len(dely)
self.nz = len(delz)
# create (empty) grid object
self.grid = np.ndarray((self.nx, self.ny, self.nz))
# update model extent
(self.extent_x, self.extent_y, self.extent_z) = (sum(self.delx), sum(self.dely), sum(self.delz))
def get_dimensions_from_geomodeller_xml_project(self, xml_filename):
"""Get grid dimensions from Geomodeller project
**Arguments**:
- *xml_filename* = string: filename of Geomodeller XML file
"""
# Note: this implementation is based on the Geomodeller API
# The boundaries could theoretically also be extracted from the XML file
# directly, e.g. using the geomodeller_xml_obj module - but this would
# require an additional module being loaded, so avoid here!
filename_ctypes = ctypes.c_char_p(xml_filename)
# get model boundaries
#Detection of operative system:
if platform.system() == "Linux":
lib = ctypes.CDLL('./libgeomod.so') #linux
elif platform.system() == "Windows":
lib = ctypes.windll.LoadLibrary(os.path.dirname(os.path.abspath(__file__)) + os.path.sep + "libgeomodwin_leak6.dll") #windows
else:
print("Your operative system is not supported")
lib.get_model_bounds.restype = ndpointer(dtype=ctypes.c_int, shape=(6,))
boundaries = lib.get_model_bounds(filename_ctypes)
(self.xmin, self.xmax, self.ymin, self.ymax, self.zmin, self.zmax) = boundaries
self.extent_x = self.xmax - self.xmin
self.extent_y = self.ymax - self.ymin
self.extent_z = self.zmax - self.zmin
def set_densities(self, densities):
"""Set layer densities
**Arguments**:
- *densities* = dictionary of floats: densities for geology ids
"""
self.densities = densities
def set_sus(self, sus):
"""Set layer susceptibilities
**Arguments**:
- *us* = dictionary of floats: magnetic susceptibilities for geology ids
"""
self.sus = sus
def set_dimensions(self, **kwds):
"""Set model dimensions, if no argument provided: xmin = 0, max = sum(delx) and accordingly for y,z
**Optional keywords**:
- *dim* = (xmin, xmax, ymin, ymax, zmin, zmax) : set dimensions explicitly
"""
if "dim" in kwds:
(self.xmin, self.xmax, self.ymin, self.ymax, self.zmin, self.zmax) = kwds['dim']
else:
self.xmin, self.ymin, self.zmin = (0., 0., 0.)
self.xmax, self.ymax, self.zmax = (sum(self.delx), sum(self.dely), sum(self.delz))
def determine_cell_centers(self):
"""Determine cell centers for all coordinate directions in "real-world" coordinates"""
if not hasattr(self, 'xmin'):
raise AttributeError("Please define grid dimensions first")
sum_delx = np.cumsum(self.delx)
sum_dely = np.cumsum(self.dely)
sum_delz = np.cumsum(self.delz)
self.cell_centers_x = np.array([sum_delx[i] - self.delx[i] / 2. for i in range(self.nx)]) + self.xmin
self.cell_centers_y = np.array([sum_dely[i] - self.dely[i] / 2. for i in range(self.ny)]) + self.ymin
self.cell_centers_z = np.array([sum_delz[i] - self.delz[i] / 2. for i in range(self.nz)]) + self.zmin
def determine_cell_boundaries(self):
"""Determine cell boundaries for all coordinates in "real-world" coordinates"""
if not hasattr(self, 'xmin'):
raise AttributeError("Please define grid dimensions first")
sum_delx = np.cumsum(self.delx)
sum_dely = np.cumsum(self.dely)
sum_delz = np.cumsum(self.delz)
self.boundaries_x = np.ndarray((self.nx+1))
self.boundaries_x[0] = 0
self.boundaries_x[1:] = sum_delx
self.boundaries_y = np.ndarray((self.ny+1))
self.boundaries_y[0] = 0
self.boundaries_y[1:] = sum_dely
self.boundaries_z = np.ndarray((self.nz+1))
self.boundaries_z[0] = 0
self.boundaries_z[1:] = sum_delz
# create a list with all bounds
self.bounds = [self.boundaries_y[0], self.boundaries_y[-1],
self.boundaries_x[0], self.boundaries_x[-1],
self.boundaries_z[0], self.boundaries_z[-1]]
def adjust_gridshape(self):
"""Reshape numpy array to reflect model dimensions"""
self.grid = np.reshape(self.grid, (self.nz, self.ny, self.nx))
self.grid = np.swapaxes(self.grid, 0, 2)
# self.grid = np.swapaxes(self.grid, 0, 1)
def export_to_vtk(self, vtk_filename="geo_grid.vtr", real_coords = True, **kwds):
"""Export grid to VTK for visualisation
**Arguments**:
- *vtk_filename* = string : vtk filename (obviously...)
- *real_coords* = bool : model extent in "real world" coordinates
**Optional Keywords**:
- *grid* = numpy grid : grid to save to vtk (default: self.grid)
- *var_name* = string : name of variable to plot (default: Geology)
"""
grid = kwds.get("grid", self.grid)
var_name = kwds.get("var_name", "Geology")
# define coordinates
x = np.zeros(self.nx + 1)
y = np.zeros(self.ny + 1)
z = np.zeros(self.nz + 1)
x[1:] = np.cumsum(self.delx)
y[1:] = np.cumsum(self.dely)
z[1:] = np.cumsum(self.delz)
# plot in coordinates
if real_coords:
x += self.xmin
y += self.ymin
z += self.zmin
out = pv.RectilinearGrid(x,y,z)
out['var_name'] = grid
out.save(vtk_filename)
def export_to_csv(self, filename = "geo_grid.csv"):
"""Export grid to x,y,z,value pairs in a csv file
Ordering is x-dominant (first increase in x, then y, then z)
**Arguments**:
- *filename* = string : filename of csv file (default: geo_grid.csv)
"""
f = open(filename, 'w')
for zz in self.delz:
for yy in self.dely:
for xx in self.delx:
f.write("%.1f,%.1f,%.1f,%.d" % (xx,yy,zz,self.grid[xx,yy,zz]))
f.close()
def determine_geology_ids(self):
"""Determine all ids assigned to cells in the grid"""
self.unit_ids = np.unique(self.grid)
def get_name_mapping_from_file(self, filename):
"""Get the mapping between unit_ids in the model and real geological names
from a csv file (e.g. the SHEMAT property file)
**Arguments**:
- *filename* = string : filename of csv file with id, name entries
"""
self.unit_name = {}
filelines = open(filename, 'r').readlines()[1:]
for line in filelines:
l = line.split(",")
self.unit_name[int(l[1])] = l[0]
def get_name_mapping_from_dict(self, unit_name_dict):
"""Get the name mapping directly from a dictionary
**Arguments**:
- *unit_name_dict* = dict with "name" : unit_id (int) pairs
"""
self.unit_name = unit_name_dict
def remap_ids(self, mapping_dictionary):
"""Remap geological unit ids to new ids as defined in mapping dictionary
**Arguments**:
- *mapping_dictionary* = dict : {1 : 1, 2 : 3, ...} : e.g.: retain
id 1, but map id 2 to 3 (note: if id not specified, it will be retained)
"""
# first step: create a single mesh for each id to avoid accidential
# overwriting below (there might be a better solution...)
if not hasattr(self, 'unit_ids'):
self.determine_geology_ids()
geol_grid_ind = {}
for k,v in mapping_dictionary.items():
geol_grid_ind[k] = self.grid == k
print("Remap id %d -> %d" % (k,v))
# now reassign values in actual grid
for k,v in mapping_dictionary.items():
print("Reassign id %d to grid" % v)
self.grid[geol_grid_ind[k]] = v
# update global geology ids
self.determine_geology_ids()
def determine_cell_volumes(self):
"""Determine cell volumes for each cell (e.g. for total formation volume calculation)"""
self.cell_volume = np.ndarray(np.shape(self.grid))
for k,dz in enumerate(self.delz):
for j,dy in enumerate(self.dely):
for i,dx in enumerate(self.delx):
self.cell_volume[i,j,k] = dx * dy * dz
def determine_indicator_grids(self):
"""Determine indicator grids for all geological units"""
self.indicator_grids = {}
if not hasattr(self, 'unit_ids'):
self.determine_geology_ids()
grid_ones = np.ones(np.shape(self.grid))
for unit_id in self.unit_ids:
self.indicator_grids[unit_id] = grid_ones * (self.grid == unit_id)
def determine_id_volumes(self):
"""Determine the total volume of each unit id in the grid
(for example for cell discretisation studies, etc."""
if not hasattr(self, 'cell_volume'):
self.determine_cell_volumes()
if not hasattr(self, 'indicator_grids'):
self.determine_indicator_grids()
self.id_volumes = {}
for unit_id in self.unit_ids:
self.id_volumes[unit_id] = np.sum(self.indicator_grids[unit_id] * self.cell_volume)
def print_unit_names_volumes(self):
"""Formatted output to STDOUT of unit names (or ids, if names are note
defined) and calculated volumes
"""
if not hasattr(self, 'id_vikumes'):
self.determine_id_volumes()
if hasattr(self, "unit_name"):
# print with real geological names
print("Total volumes of modelled geological units:\n")
for unit_id in self.unit_ids:
print("%26s : %.2f km^3" % (self.unit_name[unit_id],
self.id_volumes[unit_id]/1E9))
else:
# print with unit ids only
print("Total volumes of modelled geological units:\n")
for unit_id in self.unit_ids:
print("%3d : %.2f km^3" % (unit_id,
self.id_volumes[unit_id]/1E9))
def extract_subgrid(self, subrange, **kwds):
"""Extract a subgrid model from existing grid
**Arguments**:
- *subrange* = (x_from, x_to, y_from, y_to, z_from, z_to) : range for submodel in either cell or world coords
**Optional keywords**:
- *range_type* = 'cell', 'world' : define if subrange in cell ids (default) or real-world coordinates
"""
range_type = kwds.get('range_type', 'cell')
if not hasattr(self, 'boundaries_x'):
self.determine_cell_boundaries()
if range_type == 'world':
# determine cells
subrange[0] = np.argwhere(self.boundaries_x > subrange[0])[0][0]
subrange[1] = np.argwhere(self.boundaries_x < subrange[1])[-1][0]
subrange[2] = np.argwhere(self.boundaries_y > subrange[2])[0][0]
subrange[3] = np.argwhere(self.boundaries_y < subrange[3])[-1][0]
subrange[4] = np.argwhere(self.boundaries_z > subrange[4])[0][0]
subrange[5] = np.argwhere(self.boundaries_z < subrange[5])[-1][0]
# create a copy of the original grid
import copy
subgrid = copy.deepcopy(self)
# extract grid
subgrid.grid = self.grid[subrange[0]:subrange[1],
subrange[2]:subrange[3],
subrange[4]:subrange[5]]
subgrid.nx = subrange[1] - subrange[0]
subgrid.ny = subrange[3] - subrange[2]
subgrid.nz = subrange[5] - subrange[4]
# update extent
subgrid.xmin = self.boundaries_x[subrange[0]]
subgrid.xmax = self.boundaries_x[subrange[1]]
subgrid.ymin = self.boundaries_y[subrange[2]]
subgrid.ymax = self.boundaries_y[subrange[3]]
subgrid.zmin = self.boundaries_z[subrange[4]]
subgrid.zmax = self.boundaries_z[subrange[5]]
subgrid.extent_x = subgrid.xmax - subgrid.xmin
subgrid.extent_y = subgrid.ymax - subgrid.ymin
subgrid.extent_z = subgrid.zmax - subgrid.zmin
# update cell spacings
subgrid.delx = self.delx[subrange[0]:subrange[1]]
subgrid.dely = self.dely[subrange[2]:subrange[3]]
subgrid.delz = self.delz[subrange[4]:subrange[5]]
# now: update other attributes:
subgrid.determine_cell_centers()
subgrid.determine_cell_boundaries()
subgrid.determine_cell_volumes()
subgrid.determine_geology_ids()
# finally: return subgrid
return subgrid
# ******************************************************************************
# Some additional helper functions
# ******************************************************************************
def combine_grids(G1, G2, direction, merge_type = 'keep_first', **kwds):
"""Combine two grids along one axis
..Note: this implementation assumes (for now) that the overlap is perfectly matching,
i.e. grid cell sizes identical and at equal positions, or that they are perfectly adjacent!
**Arguments**:
- G1, G2 = GeoGrid : grids to be combined
- direction = 'x', 'y', 'z': direction in which grids are combined
- merge_type = method to combine grid:
'keep_first' : keep elements of first grid (default)
'keep_second' : keep elements of second grid
'random' : randomly choose an element to retain
..Note: all other dimensions must be matching perfectly!!
**Optional keywords**:
- *overlap_analysis* = bool : perform a detailed analysis of the overlapping area, including
mismatch. Also returns a second item, a GeoGrid with information on mismatch!
**Returns**:
- *G_comb* = GeoGrid with combined grid
- *G_overlap* = Geogrid with analysis of overlap (of overlap_analysis=True)
"""
overlap_analysis = kwds.get("overlap_analysis", False)
# first step: determine overlap
if direction == 'x':
if G2.xmax > G1.xmax:
overlap_min = G2.xmin
overlap_max = G1.xmax
# identifier alias for grids with higher/ lower values
G_high = G2
G_low = G1
else:
overlap_min = G1.xmin
overlap_max = G2.xmax
# identifier alias for grids with higher/ lower values
G_high = G1
G_low = G2
# check if all other dimensions are perfectly matching
if (G1.ymin != G2.ymin) or (G1.zmin != G2.zmin) or \
(G1.ymax != G2.ymax) or (G1.zmax != G2.zmax):
raise ValueError("Other dimensions (apart from %s) not perfectly matching! Check and try again!" % direction)
elif direction == 'y':
if G2.ymax > G1.ymax:
overlap_min = G2.ymin
overlap_max = G1.ymax
# identifier alias for grids with higher/ lower values
G_high = G2
G_low = G1
else:
overlap_min = G1.ymin
overlap_max = G2.ymax
# identifier alias for grids with higher/ lower values
G_high = G1
G_low = G2
# check if all other dimensions are perfectly matching
if (G1.xmin != G2.xmin) or (G1.zmin != G2.zmin) or \
(G1.xmax != G2.xmax) or (G1.zmax != G2.zmax):
raise ValueError("Other dimensions (apart from %s) not perfectly matching! Check and try again!" % direction)
elif direction == 'z':
if G2.zmax > G1.zmax:
overlap_min = G2.zmin
overlap_max = G1.zmax
# identifier alias for grids with higher/ lower values
G_high = G2
G_low = G1
else:
overlap_min = G1.zmin
overlap_max = G2.zmax
# identifier alias for grids with higher/ lower values
G_high = G1
G_low = G2
# check if all other dimensions are perfectly matching
if (G1.ymin != G2.ymin) or (G1.xmin != G2.xmin) or \
(G1.ymax != G2.ymax) or (G1.xmax != G2.xmax):
raise ValueError("Other dimensions (apart from %s) not perfectly matching! Check and try again!" % direction)
overlap = overlap_max - overlap_min
if overlap == 0:
print("Grids perfectly adjacent")
elif overlap < 0:
raise ValueError("No overlap between grids! Check and try again!")
else:
print("Positive overlap in %s direction of %f meters" % (direction, overlap))
# determine cell centers
G1.determine_cell_centers()
G2.determine_cell_centers()
# intialise new grid
G_comb = GeoGrid()
# initialise overlap grid, if analyis performed
if overlap_analysis:
G_overlap = GeoGrid()
if direction == 'x':
pass
elif direction == 'y':
#=======================================================================
# Perform overlap analysis
#=======================================================================
# initialise overlap grid with dimensions of overlap
G_overlap.set_dimensions(dim = (G1.xmin, G1.xmax, overlap_min, overlap_max, G1.zmin, G1.zmax))
G_low_ids = np.where(G_low.cell_centers_y > overlap_min)[0]
G_high_ids = np.where(G_high.cell_centers_y < overlap_max)[0]
delx = G1.delx
dely = G_low.dely[G_low_ids]
delz = G1.delz
G_overlap.set_delxyz((delx, dely, delz))
# check if overlap region is identical
if not (len(G_low_ids) == len(G_high_ids)):
raise ValueError("Overlap length not identical, please check and try again!")
# now: determine overlap mismatch
G_overlap.grid = G_low.grid[:,G_low_ids,:] - G_high.grid[:,G_high_ids,:]
# for some very strange reason, this next step is necessary to enable the VTK
G_overlap.grid = G_overlap.grid + np.zeros(G_overlap.grid.shape)
#
#=======================================================================
# Set up combined grid
#=======================================================================
G_comb.set_dimensions(dim = (G1.xmin, G1.xmax, G_low.ymin, G_high.ymax, G1.zmin, G1.zmax))
# combine dely arrays
dely = np.hstack((G_low.dely[:G_low_ids[0]], G_high.dely))
G_comb.set_delxyz((delx, dely, delz))
#=======================================================================
# Now merge grids
#=======================================================================
if merge_type == 'keep_first':
if G1.ymax > G2.ymax:
G_comb.grid = np.concatenate((G2._grid[:, :G_low_ids[0], :], G1._grid), axis=1)
else:
G_comb.grid = np.concatenate((G1._grid, G2._grid[:, :G_low_ids[0], :]), axis=1)
elif merge_type == 'keep_second':
pass
elif merge_type == 'random':
pass
else:
raise ValueError("Merge type %s not recognised! Please check and try again!" % merge_type)
elif direction == 'z':
pass
# Return combined grid and results of overlap analysis, if determined
if overlap_analysis:
return G_comb, G_overlap
else:
return G_comb
def optimial_cell_increase(starting_cell_width, n_cells, width):
"""Determine an array with optimal cell width for a defined starting cell width,
total number of cells, and total width
Basically, this function optimised a factor between two cells to obtain a total
width
**Arguments**:
- *starting_cell_width* = float : width of starting/ inner cell
- *n_cells* = int : total number of cells
- *total_width* = float : total width (sum over all elements in array)
**Returns**:
del_array : numpy.ndarray with cell discretisations
Note: optmisation with scipy.optimize - better (analytical?) methods might exist but
I can't think of them at the moment
"""
import scipy.optimize
# define some helper functions
def width_sum(inc_factor, inner_cell, n_cells, total_width):
return sum(del_array(inc_factor, inner_cell, n_cells)) - total_width
def del_array(inc_factor, inner_cell, n_cells):
return np.array([inner_cell * inc_factor**i for i in range(n_cells)])
# now the actual optimisation step:
opti_factor = scipy.optimize.fsolve(width_sum, 1.1, (starting_cell_width, n_cells, width))
# return the discretisation array
return del_array(opti_factor, starting_cell_width, n_cells).flatten()