def suffix(self, stop=None):
"""
Get the SNAP operator suffix sequence
Parameters
----------
stop: str
the ID of the last workflow node
Returns
-------
str
a file suffix created from the order of which the nodes will be executed
"""
nodes = self.tree.findall('node')
names = [re.sub(r'[ ]*\([0-9]+\)', '', y.attrib['id']) for y in nodes]
names_unique = []
for name in names:
if name not in names_unique:
names_unique.append(name)
if name == stop:
break
config = ExamineSnap()
suffix = '_'.join(
filter(None, [config.get_suffix(x) for x in names_unique]))
return suffix
def suffix(self):
"""
Returns
-------
str
a file suffix created from the order of which the nodes will be executed
"""
nodes = self.tree.findall('node')
names = [re.sub(r'[ ]*\([0-9]+\)', '', y.attrib['id']) for y in nodes]
names_unique = []
for name in names:
if name not in names_unique:
names_unique.append(name)
config = ExamineSnap()
suffix = '_'.join(
filter(None, [config.get_suffix(x) for x in names_unique]))
return suffix
def __init__(self, geometries):
if not isinstance(geometries, list):
raise RuntimeError('geometries must be of type list')
for geometry in geometries:
if geometry.getProjection('epsg') != 4326:
raise RuntimeError('input geometry CRS must be WGS84 LatLon (EPSG 4326)')
self.geometries = geometries
try:
self.auxdatapath = ExamineSnap().auxdatapath
except AttributeError:
self.auxdatapath = os.path.join(os.path.expanduser('~'), '.snap', 'auxdata')
def __init__(self, osvdir=None, timeout=20):
self.timeout = timeout
if osvdir is None:
try:
auxdatapath = ExamineSnap().auxdatapath
except AttributeError:
auxdatapath = os.path.join(os.path.expanduser('~'), '.snap', 'auxdata')
osvdir = os.path.join(auxdatapath, 'Orbits', 'Sentinel-1')
self.outdir_poe = os.path.join(osvdir, 'POEORB')
self.outdir_res = os.path.join(osvdir, 'RESORB')
self.pattern = r'S1[AB]_OPER_AUX_(?:POE|RES)ORB_OPOD_[0-9TV_]{48}\.EOF'
self.pattern_fine = r'(?P<sensor>S1[AB])_OPER_AUX_' \
r'(?P<type>(?:POE|RES)ORB)_OPOD_' \
r'(?P<publish>[0-9]{8}T[0-9]{6})_V' \
r'(?P<start>[0-9]{8}T[0-9]{6})_' \
r'(?P<stop>[0-9]{8}T[0-9]{6})\.EOF'
self._init_dir()
self._reorganize()
def get_egm96_lookup():
"""
If not found, download SNAP's lookup table for converting EGM96 geoid heights to WGS84 ellipsoid heights
Returns
-------
"""
try:
auxdatapath = ExamineSnap().auxdatapath
except AttributeError:
auxdatapath = os.path.join(os.path.expanduser('~'), '.snap', 'auxdata')
local = os.path.join(auxdatapath, 'dem', 'egm96', 'ww15mgh_b.zip')
os.makedirs(os.path.dirname(local), exist_ok=True)
if not os.path.isfile(local):
remote = 'http://step.esa.int/auxdata/dem/egm96/ww15mgh_b.zip'
print('{} <<-- {}'.format(local, remote))
r = requests.get(remote)
with open(local, 'wb') as out:
out.write(r.content)
def test_installation():
reg = ExamineSnap()
assert os.path.isfile(reg.gpt)
def parse_node(name, use_existing=True):
"""
parse an XML node recipe. The XML representation and parameter default values are read from the docstring of an
individual node by calling `gpt <node> -h`. The result is then written to an XML text file under
`$HOME/.pyroSAR/snap/nodes` which is subsequently read for parsing instead of again calling `gpt`.
Parameters
----------
name: str
the name of the processing node, e.g. Terrain-Correction
use_existing: bool
use an existing XML text file or force re-parsing the gpt docstring and overwriting the XML file?
Returns
-------
Node
the parsed node
Examples
--------
>>> tnr = parse_node('ThermalNoiseRemoval')
>>> print(tnr.parameters)
{'selectedPolarisations': None, 'removeThermalNoise': 'true', 'reIntroduceThermalNoise': 'false'}
"""
name = name if name.endswith('.xml') else name + '.xml'
operator = os.path.splitext(name)[0]
abspath = os.path.join(os.path.expanduser('~'), '.pyrosar', 'snap',
'nodes')
os.makedirs(abspath, exist_ok=True)
absname = os.path.join(abspath, name)
if not os.path.isfile(absname) or not use_existing:
gpt = ExamineSnap().gpt
cmd = [gpt, operator, '-h']
out, err = run(cmd=cmd, void=False)
graph = re.search('<graph id.*', out, flags=re.DOTALL).group()
graph = re.sub(r'>\${.*', '/>',
graph) # remove placeholder values like ${value}
graph = re.sub(r'<\.\.\./>.*', '', graph) # remove <.../> placeholders
if operator == 'BandMaths':
graph = graph.replace('sourceProducts', 'sourceProduct')
tree = ET.fromstring(graph)
for elt in tree.iter():
if elt.text in ['string', 'double', 'integer', 'float']:
elt.text = None
node = tree.find('node')
node.attrib['id'] = operator
# add a second source product entry for multi-source nodes
# multi-source nodes are those with an entry 'sourceProducts' instead of 'sourceProduct'
# exceptions are registered in this list:
multisource = ['Back-Geocoding']
if operator != 'Read' and operator != 'ProductSet-Reader':
source = node.find('.//sources')
child = source[0]
if child.tag == 'sourceProducts' or operator in multisource:
child2 = ET.SubElement(source, 'sourceProduct.1',
{'refid': 'Read (2)'})
child.tag = 'sourceProduct'
child.attrib['refid'] = 'Read'
child.text = None
if operator == 'BandMaths':
tree.find('.//parameters').set(
'class', 'com.bc.ceres.binding.dom.XppDomElement')
tband = tree.find('.//targetBand')
for item in [
'spectralWavelength', 'spectralBandwidth', 'scalingOffset',
'scalingFactor', 'validExpression', 'spectralBandIndex'
]:
el = tband.find('.//{}'.format(item))
tband.remove(el)
node = Node(node)
# read the default values from the parameter documentation
parameters = node.parameters.keys()
out += '-P'
for parameter in parameters:
p1 = r'-P{}.*?-P'.format(parameter)
p2 = r"Default\ value\ is '([a-zA-Z0-9 ._\(\)]+)'"
r1 = re.search(p1, out, re.S)
if r1:
sub = r1.group()
r2 = re.search(p2, sub)
if r2:
value = r2.groups()[0]
node.parameters[parameter] = value
continue
node.parameters[parameter] = None
# fill in some additional defaults
if operator == 'BandMerge':
node.parameters['geographicError'] = '1.0E-5'
with open(absname, 'w') as xml:
xml.write(str(node))
return node
else:
with open(absname, 'r') as workflow:
element = ET.fromstring(workflow.read())
return Node(element)
def execute(xmlfile,
cleanup=True,
gpt_exceptions=None,
gpt_args=None,
verbose=True):
"""
execute SNAP workflows via the Graph Processing Tool gpt.
This function merely calls gpt with some additional command
line arguments and raises a RuntimeError on fail. This
function is used internally by function :func:`gpt`, which
should be used instead.
Parameters
----------
xmlfile: str
the name of the workflow XML file
cleanup: bool
should all files written to the temporary directory during function execution be deleted after processing?
gpt_exceptions: dict
a dictionary to override the configured GPT executable for certain operators;
each (sub-)workflow containing this operator will be executed with the define executable;
- e.g. ``{'Terrain-Flattening': '/home/user/snap/bin/gpt'}``
gpt_args: list or None
a list of additional arguments to be passed to the gpt call
- e.g. ``['-x', '-c', '2048M']`` for increased tile cache size and intermediate clearing
verbose: bool
print out status messages?
Returns
-------
Raises
------
RuntimeError
"""
# read the file and extract some information
workflow = Workflow(xmlfile)
write = workflow['Write']
outname = write.parameters['file']
workers = [x.id for x in workflow if x.operator not in ['Read', 'Write']]
message = ' -> '.join(workers)
gpt_exec = None
if gpt_exceptions is not None:
for item, exec in gpt_exceptions.items():
if item in workers:
gpt_exec = exec
message += ' (using {})'.format(exec)
break
if verbose:
print(message)
# try to find the GPT executable
if gpt_exec is None:
try:
gpt_exec = ExamineSnap().gpt
except AttributeError:
raise RuntimeError('could not find SNAP GPT executable')
# create the list of arguments to be passed to the subprocess module calling GPT
cmd = [gpt_exec, '-e']
if isinstance(gpt_args, list):
cmd.extend(gpt_args)
if format == 'GeoTiff-BigTIFF':
cmd.extend([
# '-Dsnap.dataio.reader.tileWidth=*',
# '-Dsnap.dataio.reader.tileHeight=1',
'-Dsnap.dataio.bigtiff.tiling.width=256',
'-Dsnap.dataio.bigtiff.tiling.height=256',
# '-Dsnap.dataio.bigtiff.compression.type=LZW',
# '-Dsnap.dataio.bigtiff.compression.quality=0.75'
])
cmd.append(xmlfile)
# execute the workflow
proc = sp.Popen(cmd, stdout=sp.PIPE, stderr=sp.PIPE)
out, err = proc.communicate()
out = out.decode('utf-8') if isinstance(out, bytes) else out
err = err.decode('utf-8') if isinstance(err, bytes) else err
# check for a message indicating an unknown parameter,
# which can easily be removed from the workflow
pattern = r"Error: \[NodeId: (?P<id>[a-zA-Z0-9-_]*)\] " \
r"Operator \'[a-zA-Z0-9-_]*\': " \
r"Unknown element \'(?P<par>[a-zA-Z]*)\'"
match = re.search(pattern, err)
if proc.returncode == 0:
pattern = r'(?P<level>WARNING: )([a-zA-Z.]*: )(?P<message>No intersection.*)'
match = re.search(pattern, err)
if match is not None:
raise RuntimeError(re.search(pattern, err).group('message'))
return
# delete unknown parameters and run the modified workflow
elif proc.returncode == 1 and match is not None:
replace = match.groupdict()
with Workflow(xmlfile) as flow:
print(
' removing parameter {id}:{par} and executing modified workflow'
.format(**replace))
node = flow[replace['id']]
del node.parameters[replace['par']]
flow.write(xmlfile)
execute(xmlfile,
cleanup=cleanup,
gpt_exceptions=gpt_exceptions,
gpt_args=gpt_args,
verbose=verbose)
# append additional information to the error message and raise an error
else:
if proc.returncode == -9:
submessage = '[{}] the process was killed by SNAP (process return code -9). ' \
'One possible cause is a lack of memory.'.format(os.path.basename(xmlfile))
else:
submessage = '{}{}\n[{}] failed with return code {}'
if cleanup:
if os.path.isfile(outname + '.tif'):
os.remove(outname + '.tif')
elif os.path.isdir(outname):
shutil.rmtree(outname, onerror=windows_fileprefix)
elif outname.endswith('.dim'):
os.remove(outname)
shutil.rmtree(outname.replace('.dim', '.data'),
onerror=windows_fileprefix)
raise RuntimeError(
submessage.format(out, err, os.path.basename(xmlfile),
proc.returncode))
def parse_node(name, use_existing=True):
"""
parse an XML node recipe. The XML representation and parameter default values are read from the docstring of an
individual node by calling `gpt <node> -h`. The result is then written to an XML text file under
`$HOME/.pyroSAR/snap/nodes` which is subsequently read for parsing instead of again calling `gpt`.
Parameters
----------
name: str
the name of the processing node, e.g. Terrain-Correction
use_existing: bool
use an existing XML text file or force re-parsing the gpt docstring and overwriting the XML file?
Returns
-------
Node
the parsed node
Examples
--------
>>> tnr = parse_node('ThermalNoiseRemoval')
>>> print(tnr.parameters)
{'selectedPolarisations': None, 'removeThermalNoise': 'true', 'reIntroduceThermalNoise': 'false'}
"""
name = name if name.endswith('.xml') else name + '.xml'
operator = os.path.splitext(name)[0]
abspath = os.path.join(os.path.expanduser('~'), '.pyrosar', 'snap',
'nodes')
os.makedirs(abspath, exist_ok=True)
absname = os.path.join(abspath, name)
if not os.path.isfile(absname) or not use_existing:
gpt = ExamineSnap().gpt
cmd = [gpt, operator, '-h']
out, err = run(cmd=cmd, void=False)
graph = re.search('<graph id.*', out, flags=re.DOTALL).group()
tree = ET.fromstring(graph)
node = tree.find('node')
node.attrib['id'] = operator
# add a second source product entry for multi-source nodes
# multi-source nodes are those with an entry 'sourceProducts' instead of 'sourceProduct'
# exceptions are registered in this list:
multisource = ['Back-Geocoding']
if operator != 'Read':
source = node.find('.//sources')
child = source[0]
if child.tag == 'sourceProducts' or operator in multisource:
child2 = ET.SubElement(source, 'sourceProduct.1',
{'refid': 'Read (2)'})
child.tag = 'sourceProduct'
child.attrib['refid'] = 'Read'
child.text = None
node = Node(node)
# read the default values from the parameter documentation
parameters = node.parameters.keys()
out += '-P'
for parameter in parameters:
p1 = r'-P{}.*?-P'.format(parameter)
p2 = r"Default\ value\ is '([a-zA-Z0-9 ._\(\)]+)'"
r1 = re.search(p1, out, re.S)
if r1:
sub = r1.group()
r2 = re.search(p2, sub)
if r2:
value = r2.groups()[0]
node.parameters[parameter] = value
continue
node.parameters[parameter] = None
with open(absname, 'w') as xml:
xml.write(str(node))
return node
else:
with open(absname, 'r') as workflow:
element = ET.fromstring(workflow.read())
return Node(element)
def execute(xmlfile, cleanup=True, gpt_exceptions=None, verbose=True):
"""
execute SNAP workflows via the Graph Processing Tool gpt.
This function merely calls gpt with some additional command
line arguments and raises a RuntimeError on fail. This
function is used internally by function :func:`gpt`, which
should be used instead.
Parameters
----------
xmlfile: str
the name of the workflow XML file
cleanup: bool
should all files written to the temporary directory during function execution be deleted after processing?
gpt_exceptions: dict
a dictionary to override the configured GPT executable for certain operators;
each (sub-)workflow containing this operator will be executed with the define executable;
- e.g. ``{'Terrain-Flattening': '/home/user/snap/bin/gpt'}``
verbose: bool
print out status messages?
Returns
-------
Raises
------
RuntimeError
"""
# read the file and extract some information
workflow = Workflow(xmlfile)
write = workflow['Write']
outname = write.parameters['file']
infile = workflow['Read'].parameters['file']
nodes = workflow.nodes()
workers = [x.id for x in nodes if x.operator not in ['Read', 'Write']]
message = ' -> '.join(workers)
gpt_exec = None
if gpt_exceptions is not None:
for item, exec in gpt_exceptions.items():
if item in workers:
gpt_exec = exec
message += ' (using {})'.format(exec)
break
if verbose:
print(message)
# try to find the GPT executable
if gpt_exec is None:
try:
gpt_exec = ExamineSnap().gpt
except AttributeError:
raise RuntimeError('could not find SNAP GPT executable')
# create the list of arguments to be passed to the subprocess module calling GPT
if format == 'GeoTiff-BigTIFF':
cmd = [
gpt_exec,
# '-Dsnap.dataio.reader.tileWidth=*',
# '-Dsnap.dataio.reader.tileHeight=1',
'-Dsnap.dataio.bigtiff.tiling.width=256',
'-Dsnap.dataio.bigtiff.tiling.height=256',
# '-Dsnap.dataio.bigtiff.compression.type=LZW',
# '-Dsnap.dataio.bigtiff.compression.quality=0.75',
xmlfile
]
else:
cmd = [gpt_exec, xmlfile]
# execute the workflow
proc = sp.Popen(cmd, stdout=sp.PIPE, stderr=sp.PIPE)
out, err = proc.communicate()
out = out.decode('utf-8') if isinstance(out, bytes) else out
err = err.decode('utf-8') if isinstance(err, bytes) else err
# delete intermediate files if an error occurred
if proc.returncode == 1:
pattern = r"Error: \[NodeId: (?P<id>[a-zA-Z0-9-_]*)\] " \
r"Operator \'[a-zA-Z0-9-_]*\': " \
r"Unknown element \'(?P<par>[a-zA-Z]*)\'"
match = re.search(pattern, err)
if match is not None:
replace = match.groupdict()
with Workflow(xmlfile) as flow:
print(
' removing parameter {id}:{par} and executing modified workflow'
.format(**replace))
node = flow[replace['id']]
del node.parameters[replace['par']]
flow.write(xmlfile)
execute(xmlfile,
cleanup=cleanup,
gpt_exceptions=gpt_exceptions,
verbose=verbose)
else:
if cleanup:
if os.path.isfile(outname + '.tif'):
os.remove(outname + '.tif')
elif os.path.isdir(outname):
shutil.rmtree(outname)
print(out + err)
print('failed: {}'.format(os.path.basename(infile)))
err_match = re.search('Error: (.*)\n', out + err)
errmessage = err_match.group(1) if err_match else err
raise RuntimeError(errmessage)
elif proc.returncode == -9:
if cleanup:
if os.path.isfile(outname + '.tif'):
os.remove(outname + '.tif')
elif os.path.isdir(outname):
shutil.rmtree(outname)
print(
'the process was killed by SNAP. One possible cause is a lack of memory.'
)
else:
print('process return code: {}'.format(proc.returncode))
def correctOSV(id,
osvdir=None,
osvType='POE',
logpath=None,
outdir=None,
shellscript=None):
"""
correct GAMMA parameter files with orbit state vector information from dedicated OSV files;
OSV files are downloaded automatically to either the defined `osvdir` or a sub-directory `osv` of the scene directory
Parameters
----------
id: ~pyroSAR.drivers.ID
the scene to be corrected
osvdir: str
the directory of OSV files; subdirectories POEORB and RESORB are created automatically
osvType: {'POE', 'RES'}
the OSV type to be used
logpath: str or None
a directory to write command logfiles to
outdir: str or None
the directory to execute the command in
shellscript: str or None
a file to write the Gamma commands to in shell format
Returns
-------
Examples
--------
>>> from pyroSAR import identify
>>> from pyroSAR.gamma import correctOSV, convert2gamma
>>> filename = 'S1A_IW_GRDH_1SDV_20150222T170750_20150222T170815_004739_005DD8_3768.zip'
# identify the SAR scene
>>> scene = identify(filename)
# unpack the zipped scene to an arbitrary directory
>>> scene.unpack('/home/test')
>>> print(scene.scene)
/home/test/S1A_IW_GRDH_1SDV_20150222T170750_20150222T170815_004739_005DD8_3768.SAFE
# convert the unpacked scene to GAMMA format
>>> convert2gamma(id=scene, directory=scene.scene)
# correct the OSV information of the converted GAMMA images
>>> correctOSV(id=scene, osvdir='/home/test/osv')
See Also
--------
:meth:`pyroSAR.drivers.SAFE.getOSV`
"""
if not isinstance(id, ID):
raise IOError('id must be of type pyroSAR.ID')
if id.sensor not in ['S1A', 'S1B']:
raise IOError(
'this method is currently only available for Sentinel-1. Please stay tuned...'
)
if not os.path.isdir(logpath):
os.makedirs(logpath)
if osvdir is None:
try:
auxdatapath = ExamineSnap().auxdatapath
except AttributeError:
auxdatapath = os.path.join(os.path.expanduser('~'), '.snap',
'auxdata')
osvdir = os.path.join(auxdatapath, 'Orbits', 'Sentinel-1')
try:
id.getOSV(osvdir, osvType)
except URLError:
print('..no internet access')
images = id.getGammaImages(id.scene)
# read parameter file entries into object
with ISPPar(images[0] + '.par') as par:
# extract acquisition time stamp
timestamp = datetime.strptime(
par.date, '%Y-%m-%dT%H:%M:%S.%f').strftime('%Y%m%dT%H%M%S')
# find an OSV file matching the time stamp and defined OSV type(s)
with OSV(osvdir) as osv:
osvfile = osv.match(sensor=id.sensor,
timestamp=timestamp,
osvtype=osvType)
if not osvfile:
raise RuntimeError('no Orbit State Vector file found')
if osvfile.endswith('.zip'):
osvdir = os.path.join(id.scene, 'osv')
with zf.ZipFile(osvfile) as zip:
zip.extractall(path=osvdir)
osvfile = os.path.join(osvdir,
os.path.basename(osvfile).replace('.zip', ''))
# update the GAMMA parameter file with the selected orbit state vectors
print('correcting state vectors with file {}'.format(osvfile))
for image in images:
isp.S1_OPOD_vec(SLC_par=image + '.par',
OPOD=osvfile,
logpath=logpath,
outdir=outdir,
shellscript=shellscript)