def get_metadata_from_layer(layer):
"""Get ows metadata from one layer
Input
layer: Layer object. It is assumed that it has the extra attribute
data_type which is either raster or vector
"""
# Create empty metadata dictionary
metadata = {}
# Metadata specific to layer types
metadata['layer_type'] = layer.datatype
if layer.datatype == 'raster':
geotransform = extract_geotransform(layer)
metadata['geotransform'] = geotransform
metadata['resolution'] = geotransform2resolution(
geotransform,
# Get both resx
# and resy
isotropic=False)
else:
metadata['resolution'] = None
metadata['geotransform'] = None
# Metadata common to both raster and vector data
metadata['bounding_box'] = layer.boundingBoxWGS84
metadata['title'] = layer.title # This maybe overwritten by keyword
metadata['id'] = layer.id
# Extract keywords
keyword_dict = {}
if not hasattr(layer, 'keywords'):
msg = 'No keywords in %s. Submit patch to OWSLib maintainers.' % layer
raise Exception(msg)
else:
for keyword in layer.keywords:
if keyword is not None:
for keyword_string in keyword.split(','):
if ':' in keyword_string:
key, value = keyword_string.strip().split(':')
keyword_dict[key] = value
else:
keyword_dict[keyword_string] = None
# Add resolution (as a string with one element) so that layer "remembers"
# its original resolution,
# FIXME (Ole): What is the best way of collapsing 2D resolution to
# one number - resx and resy are not always identical!
if metadata['resolution'] is not None:
keyword_dict['resolution'] = str(metadata['resolution'][0])
# FIXME (Ole): The statement below does not raise an Exception,
# and nothing is written to the log file. See issue #170
#raise Exception('weird')
# Record all keywords as part of the metadata and return
metadata['keywords'] = keyword_dict
return metadata
def get_metadata_from_layer(layer):
"""Get ows metadata from one layer
Input
layer: Layer object. It is assumed that it has the extra attribute
data_type which is either raster or vector
"""
# Create empty metadata dictionary
metadata = {}
# Metadata specific to layer types
metadata['layer_type'] = layer.datatype
if layer.datatype == 'raster':
geotransform = extract_geotransform(layer)
metadata['geotransform'] = geotransform
metadata['resolution'] = geotransform2resolution(geotransform,
# Get both resx
# and resy
isotropic=False)
else:
metadata['resolution'] = None
metadata['geotransform'] = None
# Metadata common to both raster and vector data
metadata['bounding_box'] = layer.boundingBoxWGS84
metadata['title'] = layer.title # This maybe overwritten by keyword
metadata['id'] = layer.id
# Extract keywords
keyword_dict = {}
if not hasattr(layer, 'keywords'):
msg = 'No keywords in %s. Submit patch to OWSLib maintainers.' % layer
raise Exception(msg)
else:
for keyword in layer.keywords:
if keyword is not None:
for keyword_string in keyword.split(','):
if ':' in keyword_string:
key, value = keyword_string.strip().split(':')
keyword_dict[key] = value
else:
keyword_dict[keyword_string] = None
# Add resolution (as a string with one element) so that layer "remembers"
# its original resolution,
# FIXME (Ole): What is the best way of collapsing 2D resolution to
# one number - resx and resy are not always identical!
if metadata['resolution'] is not None:
keyword_dict['resolution'] = str(metadata['resolution'][0])
# FIXME (Ole): The statement below does not raise an Exception,
# and nothing is written to the log file. See issue #170
#raise Exception('weird')
# Record all keywords as part of the metadata and return
metadata['keywords'] = keyword_dict
return metadata
def get_resolution(self, isotropic=False, native=False):
"""Get raster resolution as a 2-tuple (resx, resy)
Input
isotropic: If True, verify that dx == dy and return dx
If False return 2-tuple (dx, dy)
native: Optional flag. If True, return native resolution if
available. Otherwise return actual.
"""
# Get actual resolution first
try:
res = geotransform2resolution(self.geotransform,
isotropic=isotropic)
except Exception, e:
msg = ('Resolution for layer %s could not be obtained: %s '
% (self.get_name(), str(e)))
raise Exception(msg)
