The CPHD 1.0 Data object

The DataType definition.

class sarpy.io.phase_history.cphd1_elements.Data.ChannelSizeType(Identifier=None, NumVectors=None, NumSamples=None, SignalArrayByteOffset=None, PVPArrayByteOffset=None, CompressedSignalSize=None, **kwargs)

Bases: Serializable

Parameters that define the Channel signal array and PVP array size and location.

Identifier: str

String that uniquely identifies the CPHD channel for which the data applies. Required.

Type:

str

NumVectors: int

Number of vectors in the signal array. Must be in the range [1, None] Required.

Type:

int

NumSamples: int

Number of samples per vector in the signal array. Must be in the range [1, None] Required.

Type:

int

SignalArrayByteOffset: int

Signal Array offset from the start of the Signal block (in bytes) to the start of the Signal Array for the channel. Must be in the range [0, None] Required.

Type:

int

PVPArrayByteOffset: int

PVP Array offset from the start of the PVP block (in bytes) to the start of the PVP Array for the channel. Must be in the range [0, None] Required.

Type:

int

CompressedSignalSize: int

Size (in bytes) of the compressed signal array byte sequence for the data channel. Parameter included if and only if the signal arrays are stored in compressed format. Must be in the range [1, None] Optional.

Type:

int

copy()

Create a deep copy.

classmethod from_dict(input_dict)

For json deserialization, from dict instance.

Parameters:

input_dict (dict) – Appropriate parameters dict instance for deserialization

Return type:

Corresponding class instance

classmethod from_node(node, xml_ns, ns_key=None, kwargs=None)

For XML deserialization.

Parameters:

  • node (ElementTree.Element) – dom element for serialized class instance

  • xml_ns (None|dict) – The xml namespace dictionary.

  • ns_key (None|str) – The xml namespace key. If xml_ns is None, then this is ignored. If None and xml_ns is not None, then the string default will be used. This will be recursively passed down, unless overridden by an entry of the cls._child_xml_ns_key dictionary.

  • kwargs (None|dict) – None or dictionary of previously serialized attributes. For use in inheritance call, when certain attributes require specific deserialization.

Return type:

Corresponding class instance

is_valid(recursive=False, stack=False)

Returns the validity of this object according to the schema. This is done by inspecting that all required fields (i.e. entries of _required) are not None.

Parameters:

  • recursive (bool) – True if we recursively check that child are also valid. This may result in verbose (i.e. noisy) logging.

  • stack (bool) – Print a recursive error message?

Returns:

condition for validity of this element

Return type:

bool

log_validity_error(msg)

Log a validity check error message.

Parameters:

msg (str)

log_validity_info(msg)

Log a validation info message.

Parameters:

msg (str)

log_validity_warning(msg)

Log a validity check warning message.

Parameters:

msg (str)

set_numeric_format(attribute, format_string)

Sets the numeric format string for the given attribute.

Parameters:

  • attribute (str) – attribute for which the format applies - must be in _fields.

  • format_string (str) – format string to be applied

Return type:

None

to_dict(check_validity=False, strict=False, exclude=())

For json serialization.

Parameters:

  • check_validity (bool) – Check whether the element is valid before serializing, by calling is_valid().

  • strict (bool) – Only used if check_validity = True. In that case, if True then raise an Exception (of appropriate type) if the structure is not valid, if False then log a hopefully helpful message.

  • exclude (tuple) – Attribute names to exclude from this generic serialization. This allows for child classes to provide specific serialization for special properties, after using this super method.

Returns:

dict representation of class instance appropriate for direct json serialization.

Return type:

OrderedDict

to_node(doc, tag, ns_key=None, parent=None, check_validity=False, strict=False, exclude=())

For XML serialization, to a dom element.

Parameters:

  • doc (ElementTree.ElementTree) – The xml Document

  • tag (None|str) – The tag name. Defaults to the value of self._tag and then the class name if unspecified.

  • ns_key (None|str) – The namespace prefix. This will be recursively passed down, unless overridden by an entry in the _child_xml_ns_key dictionary.

  • parent (None|ElementTree.Element) – The parent element. Defaults to the document root element if unspecified.

  • check_validity (bool) – Check whether the element is valid before serializing, by calling is_valid().

  • strict (bool) – Only used if check_validity = True. In that case, if True then raise an Exception (of appropriate type) if the structure is not valid, if False then log a hopefully helpful message.

  • exclude (tuple) – Attribute names to exclude from this generic serialization. This allows for child classes to provide specific serialization for special properties, after using this super method.

Returns:

The constructed dom element, already assigned to the parent element.

Return type:

ElementTree.Element

to_xml_bytes(urn=None, tag=None, check_validity=False, strict=False)

Gets a bytes array, which corresponds to the xml string in utf-8 encoding, identified as using the namespace given by urn (if given).

Parameters:

  • urn (None|str|dict) – The xml namespace string or dictionary describing the xml namespace.

  • tag (None|str) – The root node tag to use. If not given, then the class name will be used.

  • check_validity (bool) – Check whether the element is valid before serializing, by calling is_valid().

  • strict (bool) – Only used if check_validity = True. In that case, if True then raise an Exception (of appropriate type) if the structure is not valid, if False then log a hopefully helpful message.

Returns:

bytes array from ElementTree.tostring() call.

Return type:

bytes

to_xml_string(urn=None, tag=None, check_validity=False, strict=False)

Gets a xml string with utf-8 encoding, identified as using the namespace given by urn (if given).

Parameters:

  • urn (None|str|dict) – The xml namespace or dictionary describing the xml namespace.

  • tag (None|str) – The root node tag to use. If not given, then the class name will be used.

  • check_validity (bool) – Check whether the element is valid before serializing, by calling is_valid().

  • strict (bool) – Only used if check_validity = True. In that case, if True then raise an Exception (of appropriate type) if the structure is not valid, if False then log a hopefully helpful message.

Returns:

xml string from ElementTree.tostring() call.

Return type:

str

class sarpy.io.phase_history.cphd1_elements.Data.SupportArraySizeType(Identifier=None, NumRows=None, NumCols=None, BytesPerElement=None, ArrayByteOffset=None, **kwargs)

Bases: Serializable

Support Array size parameters.

Identifier: str

Unique string that identifies this support array. Required.

Type:

str

NumRows: int

Number of rows in the array. Must be in the range [1, None] Required.

Type:

int

NumCols: int

Number of columns per row in the array. Must be in the range [1, None] Required.

Type:

int

BytesPerElement: int

Indicates the size in bytes of each data element in the support array. Each element contains 1 or more binary-formatted components. Must be in the range [1, None] Required.

Type:

int

ArrayByteOffset: int

Array offset from the start of the Support block (in bytes) to the start of the support array. Must be in the range [0, None] Required.

Type:

int

calculate_size()

Calculates the size of the support array in bytes as described by the contained fields.

copy()

Create a deep copy.

classmethod from_dict(input_dict)

For json deserialization, from dict instance.

Parameters:

input_dict (dict) – Appropriate parameters dict instance for deserialization

Return type:

Corresponding class instance

classmethod from_node(node, xml_ns, ns_key=None, kwargs=None)

For XML deserialization.

Parameters:

  • node (ElementTree.Element) – dom element for serialized class instance

  • xml_ns (None|dict) – The xml namespace dictionary.

  • ns_key (None|str) – The xml namespace key. If xml_ns is None, then this is ignored. If None and xml_ns is not None, then the string default will be used. This will be recursively passed down, unless overridden by an entry of the cls._child_xml_ns_key dictionary.

  • kwargs (None|dict) – None or dictionary of previously serialized attributes. For use in inheritance call, when certain attributes require specific deserialization.

Return type:

Corresponding class instance

is_valid(recursive=False, stack=False)

Returns the validity of this object according to the schema. This is done by inspecting that all required fields (i.e. entries of _required) are not None.

Parameters:

  • recursive (bool) – True if we recursively check that child are also valid. This may result in verbose (i.e. noisy) logging.

  • stack (bool) – Print a recursive error message?

Returns:

condition for validity of this element

Return type:

bool

log_validity_error(msg)

Log a validity check error message.

Parameters:

msg (str)

log_validity_info(msg)

Log a validation info message.

Parameters:

msg (str)

log_validity_warning(msg)

Log a validity check warning message.

Parameters:

msg (str)

set_numeric_format(attribute, format_string)

Sets the numeric format string for the given attribute.

Parameters:

  • attribute (str) – attribute for which the format applies - must be in _fields.

  • format_string (str) – format string to be applied

Return type:

None

to_dict(check_validity=False, strict=False, exclude=())

For json serialization.

Parameters:

  • check_validity (bool) – Check whether the element is valid before serializing, by calling is_valid().

  • strict (bool) – Only used if check_validity = True. In that case, if True then raise an Exception (of appropriate type) if the structure is not valid, if False then log a hopefully helpful message.

  • exclude (tuple) – Attribute names to exclude from this generic serialization. This allows for child classes to provide specific serialization for special properties, after using this super method.

Returns:

dict representation of class instance appropriate for direct json serialization.

Return type:

OrderedDict

to_node(doc, tag, ns_key=None, parent=None, check_validity=False, strict=False, exclude=())

For XML serialization, to a dom element.

Parameters:

  • doc (ElementTree.ElementTree) – The xml Document

  • tag (None|str) – The tag name. Defaults to the value of self._tag and then the class name if unspecified.

  • ns_key (None|str) – The namespace prefix. This will be recursively passed down, unless overridden by an entry in the _child_xml_ns_key dictionary.

  • parent (None|ElementTree.Element) – The parent element. Defaults to the document root element if unspecified.

  • check_validity (bool) – Check whether the element is valid before serializing, by calling is_valid().

  • strict (bool) – Only used if check_validity = True. In that case, if True then raise an Exception (of appropriate type) if the structure is not valid, if False then log a hopefully helpful message.

  • exclude (tuple) – Attribute names to exclude from this generic serialization. This allows for child classes to provide specific serialization for special properties, after using this super method.

Returns:

The constructed dom element, already assigned to the parent element.

Return type:

ElementTree.Element

to_xml_bytes(urn=None, tag=None, check_validity=False, strict=False)

Gets a bytes array, which corresponds to the xml string in utf-8 encoding, identified as using the namespace given by urn (if given).

Parameters:

  • urn (None|str|dict) – The xml namespace string or dictionary describing the xml namespace.

  • tag (None|str) – The root node tag to use. If not given, then the class name will be used.

  • check_validity (bool) – Check whether the element is valid before serializing, by calling is_valid().

  • strict (bool) – Only used if check_validity = True. In that case, if True then raise an Exception (of appropriate type) if the structure is not valid, if False then log a hopefully helpful message.

Returns:

bytes array from ElementTree.tostring() call.

Return type:

bytes

to_xml_string(urn=None, tag=None, check_validity=False, strict=False)

Gets a xml string with utf-8 encoding, identified as using the namespace given by urn (if given).

Parameters:

  • urn (None|str|dict) – The xml namespace or dictionary describing the xml namespace.

  • tag (None|str) – The root node tag to use. If not given, then the class name will be used.

  • check_validity (bool) – Check whether the element is valid before serializing, by calling is_valid().

  • strict (bool) – Only used if check_validity = True. In that case, if True then raise an Exception (of appropriate type) if the structure is not valid, if False then log a hopefully helpful message.

Returns:

xml string from ElementTree.tostring() call.

Return type:

str

class sarpy.io.phase_history.cphd1_elements.Data.DataType(SignalArrayFormat=None, NumBytesPVP=None, SignalCompressionID=None, Channels=None, SupportArrays=None, **kwargs)

Bases: Serializable

Parameters that describe binary data components contained in the product.

copy()

Create a deep copy.

classmethod from_dict(input_dict)

For json deserialization, from dict instance.

Parameters:

input_dict (dict) – Appropriate parameters dict instance for deserialization

Return type:

Corresponding class instance

classmethod from_node(node, xml_ns, ns_key=None, kwargs=None)

For XML deserialization.

Parameters:

  • node (ElementTree.Element) – dom element for serialized class instance

  • xml_ns (None|dict) – The xml namespace dictionary.

  • ns_key (None|str) – The xml namespace key. If xml_ns is None, then this is ignored. If None and xml_ns is not None, then the string default will be used. This will be recursively passed down, unless overridden by an entry of the cls._child_xml_ns_key dictionary.

  • kwargs (None|dict) – None or dictionary of previously serialized attributes. For use in inheritance call, when certain attributes require specific deserialization.

Return type:

Corresponding class instance

is_valid(recursive=False, stack=False)

Returns the validity of this object according to the schema. This is done by inspecting that all required fields (i.e. entries of _required) are not None.

Parameters:

  • recursive (bool) – True if we recursively check that child are also valid. This may result in verbose (i.e. noisy) logging.

  • stack (bool) – Print a recursive error message?

Returns:

condition for validity of this element

Return type:

bool

log_validity_error(msg)

Log a validity check error message.

Parameters:

msg (str)

log_validity_info(msg)

Log a validation info message.

Parameters:

msg (str)

log_validity_warning(msg)

Log a validity check warning message.

Parameters:

msg (str)

set_numeric_format(attribute, format_string)

Sets the numeric format string for the given attribute.

Parameters:

  • attribute (str) – attribute for which the format applies - must be in _fields.

  • format_string (str) – format string to be applied

Return type:

None

to_dict(check_validity=False, strict=False, exclude=())

For json serialization.

Parameters:

  • check_validity (bool) – Check whether the element is valid before serializing, by calling is_valid().

  • strict (bool) – Only used if check_validity = True. In that case, if True then raise an Exception (of appropriate type) if the structure is not valid, if False then log a hopefully helpful message.

  • exclude (tuple) – Attribute names to exclude from this generic serialization. This allows for child classes to provide specific serialization for special properties, after using this super method.

Returns:

dict representation of class instance appropriate for direct json serialization.

Return type:

OrderedDict

to_node(doc, tag, ns_key=None, parent=None, check_validity=False, strict=False, exclude=())

For XML serialization, to a dom element.

Parameters:

  • doc (ElementTree.ElementTree) – The xml Document

  • tag (None|str) – The tag name. Defaults to the value of self._tag and then the class name if unspecified.

  • ns_key (None|str) – The namespace prefix. This will be recursively passed down, unless overridden by an entry in the _child_xml_ns_key dictionary.

  • parent (None|ElementTree.Element) – The parent element. Defaults to the document root element if unspecified.

  • check_validity (bool) – Check whether the element is valid before serializing, by calling is_valid().

  • strict (bool) – Only used if check_validity = True. In that case, if True then raise an Exception (of appropriate type) if the structure is not valid, if False then log a hopefully helpful message.

  • exclude (tuple) – Attribute names to exclude from this generic serialization. This allows for child classes to provide specific serialization for special properties, after using this super method.

Returns:

The constructed dom element, already assigned to the parent element.

Return type:

ElementTree.Element

to_xml_bytes(urn=None, tag=None, check_validity=False, strict=False)

Gets a bytes array, which corresponds to the xml string in utf-8 encoding, identified as using the namespace given by urn (if given).

Parameters:

  • urn (None|str|dict) – The xml namespace string or dictionary describing the xml namespace.

  • tag (None|str) – The root node tag to use. If not given, then the class name will be used.

  • check_validity (bool) – Check whether the element is valid before serializing, by calling is_valid().

  • strict (bool) – Only used if check_validity = True. In that case, if True then raise an Exception (of appropriate type) if the structure is not valid, if False then log a hopefully helpful message.

Returns:

bytes array from ElementTree.tostring() call.

Return type:

bytes

to_xml_string(urn=None, tag=None, check_validity=False, strict=False)

Gets a xml string with utf-8 encoding, identified as using the namespace given by urn (if given).

Parameters:

  • urn (None|str|dict) – The xml namespace or dictionary describing the xml namespace.

  • tag (None|str) – The root node tag to use. If not given, then the class name will be used.

  • check_validity (bool) – Check whether the element is valid before serializing, by calling is_valid().

  • strict (bool) – Only used if check_validity = True. In that case, if True then raise an Exception (of appropriate type) if the structure is not valid, if False then log a hopefully helpful message.

Returns:

xml string from ElementTree.tostring() call.

Return type:

str

SignalArrayFormat: str

Signal Array sample binary format of the CPHD signal arrays in standard (i.e. uncompressed) format, where CI2 denotes a 1 byte signed integer parameter, 2’s complement format, and 2 Bytes Per Sample; CI4 denotes a 2 byte signed integer parameter, 2’s complement format, and 4 Bytes Per Sample; CF8 denotes a 4 byte floating point parameter, and 8 Bytes Per Sample. Takes values in ('CI2', 'CI4', 'CF8'). Required.

Type:

str

NumBytesPVP: int

Number of bytes per set of Per Vector Parameters, where there is one set of PVPs for each CPHD signal vector Must be in the range [0, None] Required.

Type:

int

SignalCompressionID: str

Parameter that indicates the signal arrays are in compressed format. Value identifies the method of decompression. Parameter included if and only if the signal arrays are in compressed format. Optional.

Type:

str

Channels: List[ChannelSizeType]

Parameters that define the Channel signal array and PVP array size and location. Required.

Type:

List[ChannelSizeType]

SupportArrays: List[SupportArraySizeType]

Support Array size parameters. Branch repeated for each binary support array. Support Array referenced by its unique Support Array identifier. Optional.

Type:

List[SupportArraySizeType]

property NumSupportArrays

The number of support arrays.

Type:

int

property NumCPHDChannels

The number of CPHD channels.

Type:

int

calculate_support_block_size()

Calculates the size of the support block in bytes as described by the SupportArray fields.

calculate_pvp_block_size()

Calculates the size of the PVP block in bytes as described by the Data fields.

calculate_signal_block_size()

Calculates the size of the signal block in bytes as described by the Data fields.