def test_availableFunctions(self):
"""Check we can get the available functions from the impact calculator.
"""
myList = availableFunctions()
assert myList > 1
# Also test if it works when we give it two layers
# to see if we can determine which functions will
# work for them.
myKeywords1 = readKeywordsFromFile(self.rasterShakePath)
myKeywords2 = readKeywordsFromFile(self.vectorPath)
myList = [myKeywords1, myKeywords2]
myList = availableFunctions(myList)
assert myList > 1
def readKeywords(self, theLayer, theKeyword=None):
"""Read keywords for a datasource and return them as a dictionary.
This is a wrapper method that will 'do the right thing' to fetch
keywords for the given datasource. In particular, if the datasource
is remote (e.g. a database connection) it will fetch the keywords from
the keywords store.
Args:
* theLayer - A QGIS QgsMapLayer instance.
* theKeyword - optional - will extract only the specified keyword
from the keywords dict.
Returns:
A dict if theKeyword is omitted, otherwise the value for the
given key if it is present.
Raises:
Propogates any exception from the underlying reader delegate.
"""
mySource = str(theLayer.source())
myFlag = self.areKeywordsFileBased(theLayer)
myKeywords = None
try:
if myFlag:
myKeywords = readKeywordsFromFile(mySource, theKeyword)
else:
myKeywords = self.readKeywordFromUri(mySource, theKeyword)
return myKeywords
except Exception:
raise
def makePadangLayer():
"""Helper function that returns a single predefined layer"""
myFile = 'Shakemap_Padang_2009.asc'
myPath = os.path.join(HAZDATA, myFile)
myTitle = readKeywordsFromFile(myPath, 'title')
# myTitle = 'An earthquake in Padang like in 2009'
myLayer = QgsRasterLayer(myPath, myTitle)
QgsMapLayerRegistry.instance().addMapLayer(myLayer)
return myLayer
def test_getKeywordFromFile(self):
"""Get keyword from a filesystem file's .keyword file."""
myKeyword = readKeywordsFromFile(
self.rasterShakePath, 'category')
myExpectedKeyword = 'hazard'
myMessage = 'Got: %s\n\nExpected %s\n\nDB: %s' % (
myKeyword, myExpectedKeyword, self.rasterShakePath)
assert myKeyword == 'hazard', myMessage
# Test we get an exception if keyword is not found
try:
myKeyword = readKeywordsFromFile(
self.rasterShakePath, 'boguskeyword')
except KeywordNotFoundException:
pass # this is good
except Exception, e:
myMessage = ('Request for bogus keyword raised incorrect '
'exception type: \n %s') % str(e)
assert(), myMessage
def loadLayer(theLayerFile, DIR=TESTDATA):
"""Helper to load and return a single QGIS layer
Input
theLayerFile: Pathname to raster or vector file
DIR: Optional parameter stating the parent dir. If None,
pathname is assumed to be absolute
"""
# Extract basename and absolute path
myFilename = os.path.split(theLayerFile)[-1] # In case path was absolute
myBaseName, myExt = os.path.splitext(myFilename)
if DIR is None:
myPath = theLayerFile
else:
myPath = os.path.join(DIR, theLayerFile)
myKeywordPath = myPath[:-4] + '.keywords'
# Determine if layer is hazard or exposure
myKeywords = readKeywordsFromFile(myKeywordPath)
myType = 'undefined'
if 'category' in myKeywords:
myType = myKeywords['category']
myMessage = 'Could not read %s' % myKeywordPath
assert myKeywords is not None, myMessage
# Create QGis Layer Instance
if myExt in ['.asc', '.tif']:
myLayer = QgsRasterLayer(myPath, myBaseName)
elif myExt in ['.shp']:
myLayer = QgsVectorLayer(myPath, myBaseName, 'ogr')
else:
myMessage = 'File %s had illegal extension' % myPath
raise Exception(myMessage)
myMessage = 'Layer "%s" is not valid' % str(myLayer.source())
assert myLayer.isValid(), myMessage
return myLayer, myType
myMessage = 'Got: %s\n\nExpected %s\n\nDB: %s' % (
myKeyword, myExpectedKeyword, self.rasterShakePath)
assert myKeyword == 'hazard', myMessage
# Test we get an exception if keyword is not found
try:
myKeyword = readKeywordsFromFile(
self.rasterShakePath, 'boguskeyword')
except KeywordNotFoundException:
pass # this is good
except Exception, e:
myMessage = ('Request for bogus keyword raised incorrect '
'exception type: \n %s') % str(e)
assert(), myMessage
myKeywords = readKeywordsFromFile(self.rasterShakePath)
myExpectedKeywords = {'category': 'hazard',
'subcategory': 'earthquake',
'unit': 'MMI',
'title': 'An earthquake in Padang like in 2009'}
myMessage = 'Expected:\n%s\nGot:\n%s' % (myKeywords,
myExpectedKeywords)
assert myKeywords == myExpectedKeywords, myMessage
myKeywords = readKeywordsFromFile(self.rasterPopulationPath)
assert myKeywords == {'category': 'exposure',
'subcategory': 'population',
'datatype': 'density',
'title': 'People'}
def _clipRasterLayer(theLayer, theExtent, theCellSize=None,
theExtraKeywords=None):
"""Clip a Hazard or Exposure raster layer to the extents provided. The
layer must be a raster layer or an exception will be thrown.
.. note:: The extent *must* be in EPSG:4326.
The output layer will always be in WGS84/Geographic.
Args:
* theLayer - a valid QGIS raster layer in EPSG:4326
* theExtent - an array representing the exposure layer
extents in the form [xmin, ymin, xmax, ymax]. It is assumed
that the coordinates are in EPSG:4326 although currently
no checks are made to enforce this.
* theCellSize - cell size (in GeoCRS) which the layer should
be resampled to. If not provided for a raster layer (i.e.
theCellSize=None), the native raster cell size will be used.
Returns:
Path to the output clipped layer (placed in the
system temp dir).
Raises:
Exception if input layer is a density layer in projected coordinates -
see issue #123
"""
if not theLayer or not theExtent:
myMessage = tr('Layer or Extent passed to clip is None.')
raise InvalidParameterException(myMessage)
if theLayer.type() != QgsMapLayer.RasterLayer:
myMessage = tr('Expected a raster layer but received a %s.' %
str(theLayer.type()))
raise InvalidParameterException(myMessage)
myWorkingLayer = str(theLayer.source())
# Check for existence of keywords file
myKeywordsPath = myWorkingLayer[:-4] + '.keywords'
myMessage = tr('Input file to be clipped "%s" does not have the '
'expected keywords file %s' % (myWorkingLayer,
myKeywordsPath))
verify(os.path.isfile(myKeywordsPath), myMessage)
# Raise exception if layer is projected and refers to density (issue #123)
# FIXME (Ole): Need to deal with it - e.g. by automatically reprojecting
# the layer at this point and setting the native resolution accordingly
# in its keywords.
myKeywords = readKeywordsFromFile(myKeywordsPath)
if 'datatype' in myKeywords and myKeywords['datatype'] == 'density':
if theLayer.srs().epsg() != 4326:
# This layer is not WGS84 geographic
myMessage = ('Layer %s represents density but has spatial '
'reference "%s". Density layers must be given in '
'WGS84 geographic coordinates, so please reproject '
'and try again. For more information, see issue '
'https://github.com/AIFDR/inasafe/issues/123'
% (myWorkingLayer, theLayer.srs().toProj4()))
raise InvalidProjectionException(myMessage)
# We need to provide gdalwarp with a dataset for the clip
# because unline gdal_translate, it does not take projwin.
myClipKml = extentToKml(theExtent)
# Create a filename for the clipped, resampled and reprojected layer
myHandle, myFilename = tempfile.mkstemp('.tif', 'clip_',
getTempDir())
os.close(myHandle)
os.remove(myFilename)
# If no cell size is specified, we need to run gdalwarp without
# specifying the output pixel size to ensure the raster dims
# remain consistent.
if theCellSize is None:
myCommand = ('gdalwarp -q -t_srs EPSG:4326 -r near '
'-cutline %s -crop_to_cutline -of GTiff '
'"%s" "%s"' % (myClipKml,
myWorkingLayer,
myFilename))
else:
myCommand = ('gdalwarp -q -t_srs EPSG:4326 -r near -tr %f %f '
'-cutline %s -crop_to_cutline -of GTiff '
'"%s" "%s"' % (theCellSize,
theCellSize,
myClipKml,
myWorkingLayer,
myFilename))
myExecutablePrefix = ''
if sys.platform == 'darwin': # Mac OS X
# .. todo:: FIXME - softcode gdal version in this path
myExecutablePrefix = ('/Library/Frameworks/GDAL.framework/'
'Versions/1.9/Programs/')
myCommand = myExecutablePrefix + myCommand
# Now run GDAL warp scottie...
try:
myResult = call(myCommand, shell=True)
del myResult
except CalledProcessError, e:
myMessage = tr('<p>Error while executing the following shell command:'
'</p><pre>%s</pre><p>Error message: %s'
% (myCommand, str(e)))
# shameless hack - see https://github.com/AIFDR/inasafe/issues/141
if sys.platform == 'darwin': # Mac OS X
if 'Errno 4' in str(e):
# continue as the error seems to be non critical
pass
else:
raise Exception(myMessage)
else:
raise Exception(myMessage)
