How to use pvl - 10 common examples
To help you get started, we’ve selected a few pvl examples, based on popular ways it is used in public projects.
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Arcanewinds / FDL-LunarResources / testNAC.py View on Github 
def _load_info_lbl(image):
""" Load info on the image
Note:
If the image is from LOLA, the .LBL is parsed and the
information is returned.
If the image is from NAC, the .IMG file is parsed using
the library `pvl`_ which provide nice method to extract
the information in the header of the image.
.. _pvl: http://pvl.readthedocs.org/en/latest/
"""
label = load_label(image.img)
for key, val in label.iteritems():
if type(val) == pvl._collections.PVLObject:
for key, value in val.iteritems():
try:
setattr(image, key, value.value)
except:
setattr(image, key, value)
else:
setattr(image, key, val)
image.start_byte = image.RECORD_BYTES
image.bytesize = 4
image.projection = str(label['IMAGE_MAP_PROJECTION'][
'MAP_PROJECTION_TYPE'])
image.dtype = np.float32def _load_info_lbl(image):
""" Load info on the image
Note:
If the image is from LOLA, the .LBL is parsed and the
information is returned.
If the image is from NAC, the .IMG file is parsed using
the library `pvl`_ which provide nice method to extract
the information in the header of the image.
.. _pvl: http://pvl.readthedocs.org/en/latest/
"""
label = load_label(image.img)
for key, val in label.iteritems():
if type(val) == pvl._collections.PVLObject:
for key, value in val.iteritems():
try:
setattr(image, key, value.value)
except:
setattr(image, key, value)
else:
setattr(image, key, val)
image.start_byte = image.RECORD_BYTES
image.bytesize = 4
image.projection = str(label['IMAGE_MAP_PROJECTION'][
'MAP_PROJECTION_TYPE'])
image.dtype = np.float32# ^PTR = nnn
assert Pointer.parse(Units(101337, 'BYTES'), 0) == Pointer(None, 101337)
# ^PTR = "filename"
assert Pointer.parse('W1782844276_1.IMG', 1024) == Pointer('W1782844276_1.IMG', 0)
# ^PTR = ("filename")
assert Pointer.parse(['W1782844276_1.IMG'], 1024) == Pointer('W1782844276_1.IMG', 0)
# ^PTR = ("filename", nnn)
# Example tests/mission_data/W1782844276_1.LBL
assert Pointer.parse(['W1782844276_1.IMG', 5], 1024) == Pointer('W1782844276_1.IMG', 4096)
# ^PTR = ("filename", nnn )
assert Pointer.parse(['W1782844276_1.IMG', Units(101337, 'BYTES')], 1024) == Pointer('W1782844276_1.IMG', 101337)
# Test bad type
with pytest.raises(ValueError):
Pointer.parse(None, 64)
# Test wrong sized arrays
with pytest.raises(ValueError):
Pointer.parse([], 64)
with pytest.raises(ValueError):
Pointer.parse(['W1782844276_1.IMG', 5, 6], 64)def test_parse_pointer():
# ^PTR = nnn
# Example tests/mission_data/1p432690858esfc847p2111l2m1.img
assert Pointer.parse(56, 640) == Pointer(None, 35200)
# ^PTR = nnn
assert Pointer.parse(Units(101337, 'BYTES'), 0) == Pointer(None, 101337)
# ^PTR = "filename"
assert Pointer.parse('W1782844276_1.IMG', 1024) == Pointer('W1782844276_1.IMG', 0)
# ^PTR = ("filename")
assert Pointer.parse(['W1782844276_1.IMG'], 1024) == Pointer('W1782844276_1.IMG', 0)
# ^PTR = ("filename", nnn)
# Example tests/mission_data/W1782844276_1.LBL
assert Pointer.parse(['W1782844276_1.IMG', 5], 1024) == Pointer('W1782844276_1.IMG', 4096)
# ^PTR = ("filename", nnn )
assert Pointer.parse(['W1782844276_1.IMG', Units(101337, 'BYTES')], 1024) == Pointer('W1782844276_1.IMG', 101337)
# Test bad type
with pytest.raises(ValueError):def test_mission_data():
data_products = PlanetaryTestDataProducts()
for file_name in data_products.products:
image_path = os.path.join(data_products.directory, file_name)
try:
image = PDS3Image.open(image_path)
assert data_products.mission_data[file_name]['opens'] == "True"
assert data_products.mission_data[file_name]['label'] \
== image.label.items()[0][1]
except (pvl.decoder.ParseError, KeyError, UnicodeDecodeError,
ValueError):
try:
assert data_products.mission_data[file_name]['opens'] \
== "False"
except:
print (file_name, "is marked as True and should be false")
except AssertionError:
print (file_name, "is marked as False and should be True")for key, value in val.iteritems():
try:
setattr(self, key, value.value)
except:
setattr(self, key, value)
else:
setattr(self, key, val)
self.start_byte = self.RECORD_BYTES
self.bytesize = 4
self.projection = str(label['IMAGE_MAP_PROJECTION'][
'MAP_PROJECTION_TYPE'])
self.dtype = np.float32
elif self.grid == 'NAC':
label = load_label(self.img)
for key, val in label.iteritems():
if type(val) == pvl._collections.PVLObject:
for key, value in val.iteritems():
try:
setattr(self, key, value.value)
except:
setattr(self, key, value)
else:
setattr(self, key, val)
self.start_byte = self.RECORD_BYTES
self.bytesize = 4
self.projection = str(label['IMAGE_MAP_PROJECTION'][
'MAP_PROJECTION_TYPE'])
self.dtype = np.float32
else:
with open(self.lbl, 'r') as f:
for line in f:
attr = [f.strip() for f in line.split('=')]def _parse_label(self, stream):
return pvl.load(stream)def _load_label(self, stream):
return pvl.load(stream)for key, val in label.iteritems():
if type(val) == pvl._collections.PVLObject:
for key, value in val.iteritems():
try:
setattr(self, key, value.value)
except:
setattr(self, key, value)
else:
setattr(self, key, val)
self.start_byte = self.RECORD_BYTES
self.bytesize = 4
self.projection = str(label['IMAGE_MAP_PROJECTION'][
'MAP_PROJECTION_TYPE'])
self.dtype = np.float32
elif self.grid == 'NAC':
label = load_label(self.img)
for key, val in label.iteritems():
if type(val) == pvl._collections.PVLObject:
for key, value in val.iteritems():
try:
setattr(self, key, value.value)
except:
setattr(self, key, value)
else:
setattr(self, key, val)
self.start_byte = self.RECORD_BYTES
self.bytesize = 4
self.projection = str(label['IMAGE_MAP_PROJECTION'][
'MAP_PROJECTION_TYPE'])
self.dtype = np.float32
else:
with open(self.lbl, 'r') as f:def _load_info_lbl(image):
""" Load info on the image
Note:
If the image is from LOLA, the .LBL is parsed and the
information is returned.
If the image is from NAC, the .IMG file is parsed using
the library `pvl`_ which provide nice method to extract
the information in the header of the image.
.. _pvl: http://pvl.readthedocs.org/en/latest/
"""
label = load_label(image.img)
for key, val in label.iteritems():
if type(val) == pvl._collections.PVLObject:
for key, value in val.iteritems():
try:
setattr(image, key, value.value)
except:
setattr(image, key, value)
else:
setattr(image, key, val)
image.start_byte = image.RECORD_BYTES
image.bytesize = 4
image.projection = str(label['IMAGE_MAP_PROJECTION'][
'MAP_PROJECTION_TYPE'])
image.dtype = np.float32pvl
Python implementation for PVL (Parameter Value Language) parsing and encoding.
