isGlobal=False,
defaultPhysID=1000,
fixOpenLoops=True)
polygonShapes = qmesh.vector.identifyPolygons(loopShapes,
smallestNotMeshedArea=400,
meshedAreaPhysID=physID)
loopShapes.writeFile(line_input + str("_fixed"))
polygonShapes.writeFile(polygon_output)
if __name__ == '__main__':
import qmesh
import os
# Initialising qgis API
qmesh.initialise()
#lagoon extras
polygonise('inner', 'inner_polygon', physID=9)
polygonise('outer', 'outer_polygon', physID=8)
polygonise('inner_2', 'inner2_polygon', physID=7)
polygonise('outer_2', 'outer2_polygon', physID=6)
polygonise('marked_lagoon', 'lagoon_marked_polygon', physID=5) #ok
polygonise('marked_seaward', 'seaward_marked_polygon', physID=4) #ok
#lagoons basins
polygonise('lagoon', 'lagoon_polygon', physID=3) #ok
polygonise('cardiff_lagoon_lines', 'cardiff_lagoon_polygon', physID=2)
#channel basin
polygonise('seaward', 'seaward_polygon', physID=1) #need seaward polygon
def mesh(name):
'''Todo: add docstring '''
qmesh.initialise()
# Reading in the shapefile describing the domain boundaries, and creating a gmsh file.
boundaries = qmesh.vector.Shapes()
boundaries.fromFile('Severn_estuary_rev.shp')
loopShapes = qmesh.vector.identifyLoops(boundaries,
isGlobal=False,
defaultPhysID=1000,
fixOpenLoops=True)
polygonShapes = qmesh.vector.identifyPolygons(loopShapes,
smallestNotMeshedArea=300,
meshedAreaPhysID=1)
# Create raster for mesh gradation towards full-resolution shorelines.
GSHHS_fine_boundaries = qmesh.vector.Shapes()
GSHHS_fine_boundaries.fromFile('grad_isl.shp')
grad_0 = qmesh.raster.meshMetricTools.gradationToShapes()
grad_0.setShapes(GSHHS_fine_boundaries)
grad_0.setRasterBounds(-8.0, -2.0, 50.0, 53.0)
grad_0.setRasterResolution(1300, 1300)
grad_0.setGradationParameters(100.0, 5000.0, 0.5, 0.001)
grad_0.calculateLinearGradation()
grad_0.writeNetCDF('grad_isl.nc')
GSHHS_fine_boundaries = qmesh.vector.Shapes()
GSHHS_fine_boundaries.fromFile('grad_100.shp')
grad_1 = qmesh.raster.meshMetricTools.gradationToShapes()
grad_1.setShapes(GSHHS_fine_boundaries)
grad_1.setRasterBounds(-8.0, -2.0, 50.0, 53.0)
grad_1.setRasterResolution(1300, 1300)
grad_1.setGradationParameters(150.0, 10000.0, 1)
grad_1.calculateLinearGradation()
grad_1.writeNetCDF('grad_100.nc')
GSHHS_fine_boundaries = qmesh.vector.Shapes()
GSHHS_fine_boundaries.fromFile('grad_200.shp')
grad_2 = qmesh.raster.meshMetricTools.gradationToShapes()
grad_2.setShapes(GSHHS_fine_boundaries)
grad_2.setRasterBounds(-8.0, -2.0, 50.0, 53.0)
grad_2.setRasterResolution(1000, 1000)
grad_2.setGradationParameters(300.0, 10000.0, 1)
grad_2.calculateLinearGradation()
grad_2.writeNetCDF('grad_200.nc')
GSHHS_coarser_boundaries = qmesh.vector.Shapes()
GSHHS_coarser_boundaries.fromFile('grad_500.shp')
grad_3 = qmesh.raster.meshMetricTools.gradationToShapes()
grad_3.setShapes(GSHHS_coarser_boundaries)
grad_3.setRasterBounds(-8.0, -2.0, 50.0, 53.0)
grad_3.setRasterResolution(1300, 1300)
grad_3.setGradationParameters(1000.0, 10000.0, 1.0)
grad_3.calculateLinearGradation()
grad_3.writeNetCDF('grad_500.nc')
# Calculate overall mesh-metric raster
meshMetricRaster = qmesh.raster.meshMetricTools.minimumRaster(
[grad_1, grad_2, grad_3, grad_0]) #grad_0
meshMetricRaster.writeNetCDF('meshMetric.nc')
# Create domain object and write gmsh files.
domain = qmesh.mesh.Domain()
domain.setGeometry(loopShapes, polygonShapes)
# domain.setGeometry(loopShapes, polygonShapes)
domain.setMeshMetricField(meshMetricRaster)
domain.setTargetCoordRefSystem('EPSG:32630', fldFillValue=1000.0)
# Meshing
domain.gmsh(geoFilename= name + '.geo', \
fldFilename= name + '.fld', \
mshFilename= name + '.msh', \
)
mesh = qmesh.mesh.Mesh()
mesh.readGmsh(name + '.msh', 'EPSG:32630')
mesh.readGmsh(name + '.msh', 'EPSG:32630')
mesh.writeShapefile(name)
os.path.join(self.mesh_dir, 'mesh_metric_raster.nc'))
# Create domain object and write GMSH files
domain = qmesh.mesh.Domain()
domain.setTargetCoordRefSystem('EPSG:32654', fldFillValue=1000.0)
domain.setGeometry(loop_shapes, polygon_shapes)
domain.setMeshMetricField(mesh_metric_raster)
# Generate GMSH file
domain.gmsh(**self.mesh_kwargs)
# NOTE: Default meshing algorithm is Delaunay.
# To use a frontal approach, include "gmshAlgo='front2d'"
def convert_mesh(self):
"""
Convert mesh coordinates using QMESH.
"""
TohokuMesh = qmesh.mesh.Mesh()
TohokuMesh.readGmsh(os.path.join(self.mesh_dir, self.name + '.msh'),
'EPSG:3857')
TohokuMesh.writeShapefile(
os.path.join(self.mesh_dir, self.name + '.shp'))
for i in range(5):
ms = MeshSetup(i)
qmesh.setLogOutputFile(ms.log) # Store QMESH log for later reference
qmesh.initialise() # Initialise QGIS API
ms.generate_mesh() # Generate the mesh using QMESH
ms.convert_mesh() # Convert to shapefile (for visualisation with QGIS)