def seg2scan(fname):
"""
Scan the SEG-2 file and return the file header and trace headers.
"""
scalco = 1
scalel = 1
try:
# Try to open file
fpointer = open(fname, 'rb')
# Create a Stream object
seg2stream = Stream()
# File format
seg2stream.format = 'seg-2'
# Read the file header
endian, seg2stream.revision, trace_pointer, seg2stream.file_descriptor, string_term_char, line_term_char = _read_file_descriptor(
fpointer)
# Read trace descriptor and data blocks
_read_traces(seg2stream, fpointer, endian, trace_pointer,
string_term_char, line_term_char, scalco, scalel)
return seg2stream.file_descriptor, seg2stream.trace_descriptor
except FileNotFoundError:
pass
def seg2read(fname, **options):
"""
Read SEG-2 files and store in NESSI data structure.
:param fname: SEG-2 filename and path
.. rubric:: Basic usage
>>> # Import seg2read from nessi package
>>> from nessi.io import seg2read
>>> # Read SEG-2 file
>>> sdata = seg2read('NESSI_TEST_DATA.seg2')
"""
# Get options
scalco = options.get('scalco', 1)
scalel = options.get('scalel', 1)
try:
# Try to open file
fpointer = open(fname, 'rb')
# Create a Stream object
seg2stream = Stream()
# File format
seg2stream.format = 'seg-2'
# Read the file header
endian, seg2stream.revision, trace_pointer, seg2stream.file_descriptor, string_term_char, line_term_char = _read_file_descriptor(
fpointer)
# Read trace descriptor and data blocks
_read_traces(seg2stream, fpointer, endian, trace_pointer,
string_term_char, line_term_char, scalco, scalel)
return seg2stream
except FileNotFoundError:
pass