def test_A2(self):
"""A has a two grid cells."""
# ------- Ice Grid
gridI = self.gridI
# ------- Atmosphere Grid
vertices = [ibgrid.Vertex(spec[0], spec[1], spec[2]) for spec in [
(0, -2., -2.),
(1, 0., -2.),
(2, 2., -2.),
(3, 2., 2.),
(4, 0., 2.),
(5, -2., 2.),]]
vx = vertices
cells = [ibgrid.Cell(*spec) for spec in [
(0, (vx[0], vx[1], vx[4], vx[5]), 0,0,0,0),
(1, (vx[1], vx[2], vx[3], vx[4]), 0,0,0,0)]]
gridA = ibgrid.Grid(vertices, cells,
projection=projection,
type='MESH',
coordinates='XY')
# ------ Exchange Grid
vertices = [ibgrid.Vertex(spec[0], spec[1], spec[2]) for spec in [
(0, -1., -1.), # Original points from gridI
(1, 1., -1.),
(2, 1., 1.),
(3, -1., 1.),
(4, 0., 0.), # Middle point
(5, 0., -1.), # Split points created by overlap
(6, 0., 1.)]]
vx = vertices
cells = [ibgrid.Cell(*spec) for spec in [
(0, (vx[0], vx[5], vx[4]), 0,0,0,0),
(1, (vx[5], vx[1], vx[4]), 1,0,0,0),
(2, (vx[1], vx[2], vx[4]), 1,1,0,0),
(3, (vx[2], vx[6], vx[4]), 1,2,0,0),
(4, (vx[6], vx[3], vx[4]), 0,2,0,0),
(5, (vx[3], vx[0], vx[4]), 0,3,0,0)]]
gridX = ibgrid.Grid(vx, cells,
projection=projection,
type='MESH',
coordinates='XY',
grid1_ncells_full=gridA.cells_num_full,
grid2_ncells_full=gridI.cells_num_full,
grid1_nvertices_full=gridA.vertices_num_full,
grid2_nvertices_full=gridI.vertices_num_full)
nA = gridA.cells_num_full
AvI,weightsA,weightsI = element_l1.compute_AvI(gridX, nA, gridI)
#print(AvI.todense())
#print(weightsA)
#print(weightsI)
self.assertAlmostEqual(sum(weightsA), sum(weightsI))
def test_A1(self):
"""A has a single grid cell covering everything."""
# ------- Ice Grid
gridI = self.gridI
# ------- Atmosphere Grid
vertices = [ibgrid.Vertex(spec[0], spec[1], spec[2]) for spec in [
(0, -2., -2.),
(1, 2., -2.),
(2, 2., 2.),
(3, -2., 2.)]]
vx = vertices
cells = [ibgrid.Cell(0, [vx[0], vx[1], vx[2], vx[3]], 0,0,0,0)]
gridA = ibgrid.Grid(vertices, cells,
projection=projection,
type='MESH',
coordinates='XY')
# ------ Exchange Grid
vertices = dict(gridI.vertices)
vx = vertices
cells = [ibgrid.Cell(*spec) for spec in [
(0, (vx[0], vx[1], vx[4]), 0,0,0,0),
(1, (vx[1], vx[2], vx[4]), 0,1,0,0),
(2, (vx[2], vx[3], vx[4]), 0,2,0,0),
(3, (vx[3], vx[0], vx[4]), 0,3,0,0)]]
gridX = ibgrid.Grid(vx, cells,
projection=projection,
type='MESH',
coordinates='XY',
grid1_ncells_full=gridA.cells_num_full,
grid2_ncells_full=gridI.cells_num_full,
grid1_nvertices_full=gridA.vertices_num_full,
grid2_nvertices_full=gridI.vertices_num_full)
AvI,weightsA,weightsI = element_l1.compute_AvI(gridX, gridI)
print(AvI.todense())
print(weightsA)
print(weightsI)
self.assertAlmostEqual(2./3., weightsI[0])
self.assertAlmostEqual(2./3., weightsI[1])
self.assertAlmostEqual(2./3., weightsI[2])
self.assertAlmostEqual(2./3., weightsI[3])
self.assertAlmostEqual(1.+1./3., weightsI[4])
M = np.asarray(AvI.todense())
self.assertAlmostEqual(M[0,0], weightsI[0])
self.assertAlmostEqual(M[0,1], weightsI[1])
self.assertAlmostEqual(M[0,2], weightsI[2])
self.assertAlmostEqual(M[0,3], weightsI[3])
self.assertAlmostEqual(M[0,4], weightsI[4])
self.assertAlmostEqual(sum(weightsA), sum(weightsI))
def test_surveyors_formula(self):
"""Check that our Surveyor's Formula above is correct.
Evaluate the area of some simple polygons."""
triangle = [
ibgrid.Vertex(0, 0., 0.),
ibgrid.Vertex(1, 1., 0.),
ibgrid.Vertex(2, 0., 1.)
]
self.assertAlmostEqual(.5, area_of_polygon(triangle))
square = [
ibgrid.Vertex(0, 0., 0.),
ibgrid.Vertex(1, 1., 0.),
ibgrid.Vertex(2, 1., 1.),
ibgrid.Vertex(2, 0., 1.)
]
self.assertAlmostEqual(1., area_of_polygon(square))
def setUp(self):
# -------------- Ice Grid
vertices = [ibgrid.Vertex(spec[0], spec[1], spec[2]) for spec in [
(0, -1., -1.),
(1, 1., -1.),
(2, 1., 1.),
(3, -1., 1.),
(4, 0., 0.)]]
vx = vertices
cells = [ibgrid.Cell(*spec) for spec in [
(0, (vx[0], vx[1], vx[4]), 0,0,0,0),
(1, (vx[1], vx[2], vx[4]), 0,0,0,0),
(2, (vx[2], vx[3], vx[4]), 0,0,0,0),
(3, (vx[3], vx[0], vx[4]), 0,0,0,0)]]
self.gridI = ibgrid.Grid(vertices, cells,
projection=projection,
type='MESH',
coordinates='XY')
from icebin import ibgrid, issm
from matplotlib import pyplot
import giss.basemap
# Create our own sample triangular mesh and other grids, and plot them
# around Greenland.
X0 = -510000.
Y0 = -2810000.
L = 1.e5
projection = '+proj=stere +lon_0=-39 +lat_0=90 +lat_ts=71.0 +ellps=WGS84'
# ----------------------------------
# Atmopshere (GCM) grid
vertices = [
ibgrid.Vertex(spec[0], X0 + L * spec[1], Y0 + L * spec[2])
for spec in [(0, -2., -2.), (1, 2., -2.), (2, 2., 2.), (3, -2., 2.)]
]
vx = vertices
cells = [ibgrid.Cell(0, [vx[0], vx[1], vx[2], vx[3]], 0, 0, 0, 0)]
gridA = ibgrid.Grid(vertices,
cells,
projection=projection,
type='MESH',
coordinates='XY')
# ----------------------------------
# Ice Mesh
vertices = [
ibgrid.Vertex(spec[0], X0 + L * spec[1], Y0 + L * spec[2])
def test_cutoff_element(self):
element = [
ibgrid.Vertex(0, -1., 0.),
ibgrid.Vertex(1, 1., 0.),
ibgrid.Vertex(2, 0., 1.)
]
# Cut in half
poly0 = [
ibgrid.Vertex(0, 0., 0.),
ibgrid.Vertex(1, 1., 0.),
ibgrid.Vertex(2, 0., 1.)
]
i0 = element_l1.integrate_subelement(element, 2, poly0)
self.assertAlmostEqual(.5 * (1. / 3.) * area_of_polygon(element), i0)
# Cut off just the tip
poly1 = [
ibgrid.Vertex(0, -.5, .5),
ibgrid.Vertex(1, .5, .5),
ibgrid.Vertex(2, 0., 1.)
]
i1 = element_l1.integrate_subelement(element, 2, poly1)
area_poly1 = area_of_polygon(poly1)
vol1_part0 = .5 * (
1. / 3.
) * area_poly1 # Volume of the tip pyramid, starting at .5 height
vol1 = vol1_part0 \
+ (area_poly1 * .5) # Volume on the "pedastal" beneath
self.assertAlmostEqual(vol1, i1)
# Cut off just the base
poly2 = [
ibgrid.Vertex(0, -1., 0.),
ibgrid.Vertex(1, 1., 0.),
ibgrid.Vertex(1, .5, .5),
ibgrid.Vertex(0, -.5, .5)
]
i2 = element_l1.integrate_subelement(element, 2, poly1)
self.assertAlmostEqual(i0 * 2., i1 + i2)
def setUp(self):
self.triangle = [
ibgrid.Vertex(0, 0., 0.),
ibgrid.Vertex(1, 1., 0.),
ibgrid.Vertex(2, 0., 1.)
]
