flopy.utils.voronoi module

class VoronoiGrid(tri, **kwargs)

Bases: object

FloPy VoronoiGrid helper class for creating a voronoi model grid from an array of input points that define cell centers. The class handles boundary cells by closing polygons along the edge, something that cannot be done directly with the scipy.spatial.Voronoi class.

Parameters

• input (flopy.utils.Triangle) – Constructred and built flopy Triangle object.

• kwargs (dict) – List of additional keyword arguments that will be passed through to scipy.spatial.Voronoi. For circular shaped model grids, the qhull_options=’Qz’ option has been found to work well.

Notes

When using VoronoiGrid, the construction order used for the Triangle grid matters. The first add_polygon() call must be to add the model domain. Then add_polygon() must be used to add any holes. Lastly, add_polygon() can be used to add regions. This VoronoiGrid class uses this order to find model edges that require further work for defining and closing edge model cells.

get_disu5_gridprops()

get_disu6_gridprops()

get_disv_gridprops()

Get a dictionary of arguments that can be passed in to the flopy.mf6.ModflowGwfdisv class.

Returns

disv_gridprops – Dictionary of arguments than can be unpacked into the flopy.mf6.ModflowGwfdisv constructor

Return type

dict

get_gridprops_unstructuredgrid()

Get a dictionary of information needed to create a flopy UnstructuredGrid. The returned dictionary can be unpacked directly into the flopy.discretization.UnstructuredGrid() constructor.

Returns

gridprops

Return type

dict

get_gridprops_vertexgrid()

Get a dictionary of information needed to create a flopy VertexGrid. The returned dictionary can be unpacked directly into the flopy.discretization.VertexGrid() constructor.

Returns

gridprops

Return type

dict

get_patch_collection(ax=None, **kwargs)

Get a matplotlib patch collection representation of the voronoi grid

Parameters

• ax (matplotlib.pyplot.Axes) – axes to plot the patch collection

• kwargs (dict) – Additional keyward arguments to pass to the flopy.plot.plot_cvfd function that returns a patch collection from verts and iverts

Returns

pc – patch collection of model

Return type

matplotlib.collections.PatchCollection

plot(ax=None, plot_title=True, **kwargs)

Plot the voronoi model grid

Parameters

• ax (matplotlib.pyplot.Axes) – axes to plot the voronoi grid

• plot_title (bool) – Add the number of cells and number of vertices as a plot title

• kwargs (dict) – Additional keyword arguments to pass to self.get_patch_collection

Returns

ax – axes that contains the voronoi model grid

Return type

matplotlib.pyplot.Axes

get_sorted_vertices(icell_vertices, vertices)

get_valid_faces(vor)

point_in_cell(point, vertices)

sort_vertices(vlist)

tri2vor(tri, **kwargs)

This is the workhorse for the VoronoiGrid class for creating a voronoi grid from a constructed and built flopy Triangle grid.

Parameters

• tri (flopy.utils.Triangle) –

• voronoi (Flopy triangle object is used to construct the complementary) –

• diagram. –

Returns

verts, iverts

Return type

ndarray, list of lists