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This package translates geospatial vector data (points, lines, or polygons) to unstructured meshes.
.. code:: python
import pandamesh as pm
south_america = pm.data.south_america()
south_america = south_america.explode(index_parts=True).reset_index().to_crs(epsg=32620)
south_america["cellsize"] = 500_000.0 mesher = pm.TriangleMesher(south_america) vertices, faces = mesher.generate()
.. image:: https://raw.githubusercontent.com/Deltares/pandamesh/main/docs/_static/pandamesh-demo.png :target: https://github.com/deltares/pandamesh
The package converts geospatial data, presented as
geopandas
GeoDataFrames
, to unstructured meshes using the open source
high quality mesh generators:
Gmsh
_Triangle
_utilizing the respective Python API's, available at:
For completeness, the source code of both projects can be found at:
api/gmsh.py
These APIs are wrapped in two lightweight classes: pandamesh.TriangleMesher
and pandamesh.GmshMesher
. Both are initialized with a GeoDataFrame defining
the geometry features of the mesh. During initialization, geometries are
checked for overlaps and intersections, as the mesh generators cannot deal with
these. Generated meshes are returned as two numpy arrays: the coordinates of
the vertices, and the connectivity of the mesh faces to these vertices (as is
usual
_ for many unstructured grid representations).
GeoPandas is not suited for geometries that "wrap around" the world. Consequently, this package cannot generate meshes for e.g. a sphere.
.. code:: console
pip install pandamesh
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The documentation can be found here
_.
Pandamesh has been developed because none of the existing packages provide a straightforward scripting based approach to converting 2D vector geometries to 2D unstructured grids.
Examples of other packages which work with unstructured meshes are listed below.
See also this list
_ for many other mesh generation tools.
pygmsh
The pygmsh Python package
_ provides useful abstractions from Gmsh's own
Python interface so you can create complex geometries more easily. It also
provides tools for 3D operations (e.g. extrusions).
qgis-gsmh
qgis-gmsh generates geometry input files for the GMSH mesh generator and converts the Gmsh mesh files to shapefiles that can be imported into QGIS.
Source: https://github.com/ccorail/qgis-gmsh
Shingle
Shingle provides generalised self-consistent and automated domain discretisation for multi-scale geophysical models.
Source: https://github.com/shingleproject/Shingle
Website: http://shingleproject.org/index_shingle1.0.html
.. _here: https://deltares.github.io/pandamesh/ .. _geopandas: https://geopandas.org/ .. _GeoDataFrames: https://geopandas.org/en/stable/docs/reference/api/geopandas.GeoDataFrame.html .. _Gmsh: https://gmsh.info/ .. _Triangle: https://www.cs.cmu.edu/~quake/triangle.html .. _usual: https://ugrid-conventions.github.io/ugrid-conventions/ .. _pygmsh Python package: https://github.com/nschloe/pygmsh .. _this list: https://github.com/nschloe/awesome-scientific-computing#meshing