def getRunner(self):
""" Factory to create a new runner thread.
Requires three parameters to be set before execution
can take place:
* Hazard layer - a path to a raster (string)
* Exposure layer - a path to a vector hazard layer (string).
* Function - a function name that defines how the Hazard assessment
will be computed (string).
Args:
None.
Returns:
None
Raises:
InsufficientParametersException if not all parameters are
set.
"""
self._filename = None
self._result = None
if self._hazardLayer is None or self._hazardLayer == '':
myMessage = self.tr('Error: Hazard layer not set.')
raise InsufficientParametersException(myMessage)
if self._exposureLayer is None or self._exposureLayer == '':
myMessage = self.tr('Error: Exposure layer not set.')
raise InsufficientParametersException(myMessage)
if self._function is None or self._function == '':
myMessage = self.tr('Error: Function not set.')
raise InsufficientParametersException(myMessage)
# Call impact calculation engine
try:
myHazardLayer = readSafeLayer(self._hazardLayer)
myExposureLayer = readSafeLayer(self._exposureLayer)
except:
raise
myFunctions = getSafeImpactFunctions(self._function)
myFunction = myFunctions[0][self._function]
return ISImpactCalculatorThread(myHazardLayer,
myExposureLayer,
myFunction)
def testRasterScaling_projected(self):
"""Attempt to scale projected density raster layers raise exception
Automatic scaling when resampling density data
does not currently work for projected layers. See issue #123.
For the time being this test checks that an exception is raised
when scaling is attempted on projected layers.
When we resolve issue #123, this test should be rewritten.
"""
test_filename = 'Population_Jakarta_UTM48N.tif'
myRasterPath = ('%s/%s' % (TESTDATA, test_filename))
# Get reference values
R = readSafeLayer(myRasterPath)
R_min, R_max = R.get_extrema()
native_resolution = R.get_resolution()
print
print R_min, R_max
print native_resolution
# Define bounding box in EPSG:4326
bounding_box = [106.61, -6.38, 107.05, -6.07]
# Test for a range of resolutions
for res in [0.02, 0.01, 0.005, 0.002, 0.001]:
# Clip the raster to the bbox
extraKeywords = {'resolution': native_resolution}
myRasterLayer = QgsRasterLayer(myRasterPath, 'xxx')
try:
myResult = clipLayer(myRasterLayer, bounding_box, res,
theExtraKeywords=extraKeywords)
except InvalidProjectionException:
pass
else:
msg = 'Should have raised InvalidProjectionException'
raise Exception(msg)
def test_getOptimalExtent(self):
"""Optimal extent is calculated correctly
"""
exposure_path = os.path.join(TESTDATA, 'Population_2010.asc')
hazard_path = os.path.join(HAZDATA,
'Lembang_Earthquake_Scenario.asc')
# Expected data
haz_metadata = {'bounding_box': (105.3000035,
-8.3749994999999995,
110.2914705,
-5.5667784999999999),
'resolution': (0.0083330000000000001,
0.0083330000000000001)}
exp_metadata = {'bounding_box': (94.972335000000001,
-11.009721000000001,
141.0140016666665,
6.0736123333332639),
'resolution': (0.0083333333333333003,
0.0083333333333333003)}
# Verify relevant metada is ok
H = readSafeLayer(hazard_path)
E = readSafeLayer(exposure_path)
hazard_bbox = H.get_bounding_box()
assert numpy.allclose(hazard_bbox, haz_metadata['bounding_box'],
rtol=1.0e-12, atol=1.0e-12)
exposure_bbox = E.get_bounding_box()
assert numpy.allclose(exposure_bbox, exp_metadata['bounding_box'],
rtol=1.0e-12, atol=1.0e-12)
hazard_res = H.get_resolution()
assert numpy.allclose(hazard_res, haz_metadata['resolution'],
rtol=1.0e-12, atol=1.0e-12)
exposure_res = E.get_resolution()
assert numpy.allclose(exposure_res, exp_metadata['resolution'],
rtol=1.0e-12, atol=1.0e-12)
# First, do some examples that produce valid results
ref_res = [105.3000035, -8.3749995, 110.2914705, -5.5667785]
view_port = [94.972335, -11.009721, 141.014002, 6.073612]
bbox = getOptimalExtent(hazard_bbox, exposure_bbox, view_port)
assert numpy.allclose(bbox, ref_res, rtol=1.0e-12, atol=1.0e-12)
bbox = getOptimalExtent(hazard_bbox, exposure_bbox, view_port)
assert numpy.allclose(bbox, ref_res, rtol=1.0e-12, atol=1.0e-12)
view_port = [105.3000035,
-8.3749994999999995,
110.2914705,
-5.5667784999999999]
bbox = getOptimalExtent(hazard_bbox, exposure_bbox, view_port)
assert numpy.allclose(bbox, ref_res,
rtol=1.0e-12, atol=1.0e-12)
# Then one where boxes don't overlap
view_port = [105.3, -4.3, 110.29, -2.5]
try:
getOptimalExtent(hazard_bbox, exposure_bbox, view_port)
except Exception, e:
myMessage = 'Did not find expected error message in %s' % str(e)
assert 'did not overlap' in str(e), myMessage
def testRasterScaling(self):
"""Raster layers can be scaled when resampled
This is a test for ticket #52
Native test .asc data has
Population_Jakarta_geographic.asc
ncols 638
nrows 649
cellsize 0.00045228819716044
Population_2010.asc
ncols 5525
nrows 2050
cellsize 0.0083333333333333
Scaling is necessary for raster data that represents density
such as population per km^2
"""
for test_filename in ['Population_Jakarta_geographic.asc',
'Population_2010.asc']:
myRasterPath = ('%s/%s' % (TESTDATA, test_filename))
# Get reference values
R = readSafeLayer(myRasterPath)
R_min_ref, R_max_ref = R.get_extrema()
del R_max_ref
del R_min_ref
native_resolution = R.get_resolution()
# Get the Hazard extents as an array in EPSG:4326
bounding_box = R.get_bounding_box()
# Test for a range of resolutions
for res in [0.02, 0.01, 0.005, 0.002, 0.001, 0.0005, # Coarser
0.0002]: # Finer
# To save time only do two resolutions for the
# large population set
if test_filename.startswith('Population_2010'):
if res > 0.01 or res < 0.005:
break
# Clip the raster to the bbox
extraKeywords = {'resolution': native_resolution}
myRasterLayer = QgsRasterLayer(myRasterPath, 'xxx')
myResult = clipLayer(myRasterLayer, bounding_box, res,
theExtraKeywords=extraKeywords)
R = readSafeLayer(myResult)
A_native = R.get_data(scaling=False)
A_scaled = R.get_data(scaling=True)
sigma = (R.get_resolution()[0] / native_resolution[0]) ** 2
# Compare extrema
expected_scaled_max = sigma * numpy.nanmax(A_native)
msg = ('Resampled raster was not rescaled correctly: '
'max(A_scaled) was %f but expected %f'
% (numpy.nanmax(A_scaled), expected_scaled_max))
# FIXME (Ole): The rtol used to be 1.0e-8 -
# now it has to be 1.0e-6, otherwise we get
# max(A_scaled) was 12083021.000000 but
# expected 12083020.414316
# Is something being rounded to the nearest
# integer?
assert numpy.allclose(expected_scaled_max,
numpy.nanmax(A_scaled),
rtol=1.0e-6, atol=1.0e-8), msg
expected_scaled_min = sigma * numpy.nanmin(A_native)
msg = ('Resampled raster was not rescaled correctly: '
'min(A_scaled) was %f but expected %f'
% (numpy.nanmin(A_scaled), expected_scaled_min))
assert numpy.allclose(expected_scaled_min,
numpy.nanmin(A_scaled),
rtol=1.0e-8, atol=1.0e-12), msg
# Compare elementwise
msg = 'Resampled raster was not rescaled correctly'
assert nanallclose(A_native * sigma, A_scaled,
rtol=1.0e-8, atol=1.0e-8), msg
# Check that it also works with manual scaling
A_manual = R.get_data(scaling=sigma)
msg = 'Resampled raster was not rescaled correctly'
assert nanallclose(A_manual, A_scaled,
rtol=1.0e-8, atol=1.0e-8), msg
# Check that an exception is raised for bad arguments
try:
R.get_data(scaling='bad')
except:
pass
else:
msg = 'String argument should have raised exception'
raise Exception(msg)
try:
R.get_data(scaling='(1, 3)')
except:
pass
else:
msg = 'Tuple argument should have raised exception'
raise Exception(msg)
# Check None option without keyword datatype == 'density'
R.keywords['datatype'] = 'undefined'
A_none = R.get_data(scaling=None)
msg = 'Data should not have changed'
assert nanallclose(A_native, A_none,
rtol=1.0e-12, atol=1.0e-12), msg
# Try with None and density keyword
R.keywords['datatype'] = 'density'
A_none = R.get_data(scaling=None)
msg = 'Resampled raster was not rescaled correctly'
assert nanallclose(A_scaled, A_none,
rtol=1.0e-12, atol=1.0e-12), msg
R.keywords['datatype'] = 'counts'
A_none = R.get_data(scaling=None)
msg = 'Data should not have changed'
assert nanallclose(A_native, A_none,
rtol=1.0e-12, atol=1.0e-12), msg
def test_clipBoth(self):
"""Raster and Vector layers can be clipped
"""
# Create a vector layer
myName = 'padang'
myVectorLayer = QgsVectorLayer(VECTOR_PATH, myName, 'ogr')
msg = 'Did not find layer "%s" in path "%s"' % (myName,
VECTOR_PATH)
# FIXME (Ole): This does not work when file doesn't exist (Issue #170)
assert myVectorLayer is not None, msg
# Create a raster layer
myName = 'shake'
myRasterLayer = QgsRasterLayer(RASTERPATH, myName)
myMessage = 'Did not find layer "%s" in path "%s"' % (myName,
RASTERPATH)
# FIXME (Ole): This does not work when file doesn't exist (Issue #170)
assert myRasterLayer is not None, myMessage
# Create a bounding box
myViewportGeoExtent = [99.53, -1.22, 101.20, -0.36]
# Get the Hazard extents as an array in EPSG:4326
myHazardGeoExtent = [myRasterLayer.extent().xMinimum(),
myRasterLayer.extent().yMinimum(),
myRasterLayer.extent().xMaximum(),
myRasterLayer.extent().yMaximum()]
# Get the Exposure extents as an array in EPSG:4326
myExposureGeoExtent = [myVectorLayer.extent().xMinimum(),
myVectorLayer.extent().yMinimum(),
myVectorLayer.extent().xMaximum(),
myVectorLayer.extent().yMaximum()]
# Now work out the optimal extent between the two layers and
# the current view extent. The optimal extent is the intersection
# between the two layers and the viewport.
# Extent is returned as an array [xmin,ymin,xmax,ymax]
myGeoExtent = getOptimalExtent(myHazardGeoExtent,
myExposureGeoExtent,
myViewportGeoExtent)
# Clip the vector to the bbox
myResult = clipLayer(myVectorLayer, myGeoExtent)
# Check the output is valid
assert os.path.exists(myResult)
readSafeLayer(myResult)
# Clip the raster to the bbox
myResult = clipLayer(myRasterLayer, myGeoExtent)
# Check the output is valid
assert os.path.exists(myResult)
readSafeLayer(myResult)
# -------------------------------
# Check the extra keywords option
# -------------------------------
# Clip the vector to the bbox
myResult = clipLayer(myVectorLayer, myGeoExtent,
theExtraKeywords={'kermit': 'piggy'})
# Check the output is valid
assert os.path.exists(myResult)
L = readSafeLayer(myResult)
kwds = L.get_keywords()
msg = 'Extra keyword was not found in %s: %s' % (myResult, kwds)
assert kwds['kermit'] == 'piggy'
# Clip the raster to the bbox
myResult = clipLayer(myRasterLayer, myGeoExtent,
theExtraKeywords={'zoot': 'animal'})
# Check the output is valid
assert os.path.exists(myResult)
L = readSafeLayer(myResult)
kwds = L.get_keywords()
msg = 'Extra keyword was not found in %s: %s' % (myResult, kwds)
assert kwds['zoot'] == 'animal', msg
