def test_mix_ins(self):
"""
test the added mjix in at end of ph5api that
aren't used within api itself
"""
# true case
result = ph5api.is_in(0, 10000, 5, 1000)
self.assertTrue(result)
# false
result = ph5api.is_in(99999, 10000, 5, 1000)
self.assertFalse(result)
# get float epoch
fepoch = ph5api.fepoch(1000000, 9555)
self.assertEqual(1000000.009555, fepoch)
fepoch = ph5api.fepoch(1978346, 100000000)
self.assertEqual(1978446, fepoch)
# filter a das
self.ph5API_object.read_das_t('5553')
das_t = ph5api.filter_das_t(self.ph5API_object.Das_t['5553']['rows'],
1)
self.assertEqual(2, len(das_t))
das_t = ph5api.filter_das_t(self.ph5API_object.Das_t['5553']['rows'],
-2)
self.assertEqual(1, len(das_t))
das_t = ph5api.filter_das_t(self.ph5API_object.Das_t['5553']['rows'],
-9)
self.assertEqual(0, len(das_t))
def _is_in(das, shot_time, length, si):
'''
Test to see if data is available for a given das
starting at shot_time for length.
Check to see if there are any gaps greater than the sample interval.
Inputs:
das - The das serial number as a string
shot_time - The shot time as a timedoy object
length - Length is seconds as a float
si - Sample interval in seconds
Returns:
A tuple containing:
Match first sample time as a timedoy object, None if no match
Match last sample time as a timedoy object, None if no match
Gaps as a list of start and end times as timedoy objects
'''
if das in DATA:
data = DATA[das]
else:
data = []
shot_start_epoch = shot_time.epoch(fepoch=True)
shot_stop_epoch = shot_start_epoch + length
hits = []
gaps = []
for d in data:
data_start_epoch = d['window_start'].epoch(fepoch=True)
data_stop_epoch = d['window_stop'].epoch(fepoch=True)
# Call ph5api.is_in
if is_in(data_start_epoch, data_stop_epoch, shot_start_epoch,
shot_stop_epoch):
hits.append(d)
# Match no gaps
if len(hits) == 1:
return hits[0]['first_sample'], hits[0]['last_sample'], gaps
# No match
elif len(hits) == 0:
return None, None, gaps
# Match with gaps
else:
fs = None
ls = None
for h in hits:
if fs is None:
fs = h['first_sample']
if ls is None:
ls = h['last_sample']
delta = abs(
timedoy.passcal2epoch(h['last_sample']) -
timedoy.passcal2epoch(ls))
if delta > si:
gaps.append((ls, h['last_sample']))
ls = h['last_sample']
return fs, ls, gaps
def gather(args, p5):
''' Create receiver gather '''
for sta in args.stations_to_gather:
try:
# Read the appropriate line from Array_t
if args.station_array in p5.Array_t:
array_t = p5.Array_t[args.station_array]['byid'][sta]
else:
p5.read_array_t(args.station_array)
array_t = p5.Array_t[args.station_array]['byid'][sta]
LOGGER.info("Extracting receiver(s) at station {0:s}.".format(sta))
LOGGER.info("Found the following components:")
for c in array_t.keys():
LOGGER.info("DAS: {0} component: {1}".format(
array_t[c][0]['das/serial_number_s'], c))
LOGGER.info("Lat: {0} Lon: {1} Elev: {2}".format(
array_t[c][0]['location/Y/value_d'],
array_t[c][0]['location/X/value_d'],
array_t[c][0]['location/Z/value_d']))
LOGGER.info("{0}".format(array_t[c][0]['description_s']))
# Read the appropriate line from Das_t and get the sample rate
p5.read_das_t(array_t[c][0]['das/serial_number_s'],
array_t[c][0]['deploy_time/epoch_l'],
array_t[c][0]['pickup_time/epoch_l'])
sr = float(p5.Das_t[array_t[c][0]['das/serial_number_s']]['rows']
[0]['sample_rate_i']) / float(
p5.Das_t[array_t[c][0]['das/serial_number_s']]
['rows'][0]['sample_rate_multiplier_i'])
except KeyError as e:
LOGGER.warn(
"Warning: The station {0} not found in the current array.\n".
format(sta))
continue
i = 0 # Number of traces found
fh = None # SEG-Y file
# Get a mostly empty instance of segyfactory
sf = segyfactory.Ssegy(None, None, utm=args.use_utm)
# Set the type of extended header to write
sf.set_ext_header_type(args.ext_header)
# Should we allow traces that are 2^16 samples long
sf.set_break_standard(args.break_standard)
# Filter out un-wanted channels here
chans_available = array_t.keys()
chans = []
# Put the desired channels in the desired order
for c in args.channels:
if c in chans_available:
chans.append(c)
# Channel name for output file name
chan_name = ''
for c in chans:
chan_name += "{0}".format(c)
# Read Event_t_xxx
Event_t = p5.Event_t[args.shot_line]['byid']
order = p5.Event_t[args.shot_line]['order']
# Take a guess at the number of traces in this SEG-Y file based on
# number of shots
num_traces = len(order) * len(chans)
# Try to read offset distances (keyed on shot id's)
Offset_t = p5.read_offsets_receiver_order(args.station_array, sta,
args.shot_line)
# Loop through each shot by shot id
for o in order:
# Check event list (and also shot_range), args.evt_list, here!
if args.evt_list:
if o not in args.evt_list:
continue
# Appropriate line from Event_t
event_t = Event_t[o]
# Need to handle time offset here, args.seconds_offset_from_shot
event_tdoy = timedoy.TimeDOY(
microsecond=event_t['time/micro_seconds_i'],
epoch=event_t['time/epoch_l'])
# Adjust start time based on offset entered on command line
if args.seconds_offset_from_shot:
event_tdoy += args.seconds_offset_from_shot
end_tdoy = event_tdoy + args.length
start_fepoch = event_tdoy.epoch(fepoch=True)
stop_fepoch = end_tdoy.epoch(fepoch=True)
# Set start time in segyfactory
sf.set_cut_start_epoch(start_fepoch)
# Set event
sf.set_event_t(event_t)
# Set shot to receiver distance
sf.set_offset_t(Offset_t[o])
# Set number of samples in trace, gets reset if decimated
sf.set_length_points(int((stop_fepoch - start_fepoch) * sr))
# Loop through each channel (channel_number_i)
for c in chans:
if c not in array_t:
continue
# Filter out unwanted seed loc codes
if args.seed_location and\
array_t[c][0]['seed_location_code_s'] != args.seed_location:
LOGGER.info("Location code mismatch: {0}/{1}/{2}".format(
array_t[c][0]['seed_location_code_s'],
args.seed_location, c))
continue
# Filter out unwanted seed channels
seed_channel_code_s = ph5api.seed_channel_code(array_t[c][0])
if args.seed_channel and\
seed_channel_code_s != args.seed_channel:
LOGGER.info("Channel code mismatch: {0}/{1}/{2}".format(
array_t[c][0]['seed_channel_code_s'],
args.seed_channel, c))
continue
# DAS
das = array_t[c][0]['das/serial_number_s']
for t in range(len(array_t[c])):
# Deploy time
start_epoch = array_t[c][t]['deploy_time/epoch_l']
# Pickup time
stop_epoch = array_t[c][t]['pickup_time/epoch_l']
# Is this shot within the deploy and pickup times
if not ph5api.is_in(start_epoch, stop_epoch,
event_tdoy.epoch(), end_tdoy.epoch()):
LOGGER.info("Data logger {0} not deployed between\
{1} to {2} at {3}.".format(
array_t[c][t]['das/serial_number_s'], event_tdoy,
end_tdoy, sta))
if args.deploy_pickup:
LOGGER.info("Skipping.")
continue
# Need to apply reduction velocity here
if args.red_vel > 0.:
try:
secs, errs = segyfactory.calc_red_vel_secs(
Offset_t[o], args.red_vel)
except Exception as e:
secs = 0.
errs = [
"Can not calculate "
"reduction velocity: {0}.".format(e.message)
]
for e in errs:
LOGGER.info(e)
start_fepoch += secs
stop_fepoch += secs
# Set array_t in segyfactory
sf.set_array_t(array_t[c][t])
# Read Das table
p5.forget_das_t(das)
#
# Cut trace
#
traces = p5.cut(das,
start_fepoch,
stop_fepoch,
chan=c,
sample_rate=sr)
trace = ph5api.pad_traces(traces)
if args.do_time_correct:
LOGGER.info("Applied time drift correction by\
shifting trace by {0} samples.".format(
-1 * sr * (trace.time_correction_ms / 1000.)))
LOGGER.info("Correction is {0} ms.".format(
trace.time_correction_ms))
LOGGER.info("Clock drift (seconds/second): {0}".format(
trace.clock.slope))
for tccomment in trace.clock.comment:
tccmt = tccomment.split('\n')
for tcc in tccmt:
LOGGER.info("Clock comment: {0}".format(tcc))
if trace.nsamples == 0:
LOGGER.info("No data found for DAS "
"{0} between {1} and {2}.".format(
das, event_tdoy.getPasscalTime(),
end_tdoy.getPasscalTime()))
continue
if trace.padding != 0:
LOGGER.warn(
"Warning: There were {0} samples of padding\
added to fill gap(s) in original traces.".trace.
padding)
# Need to apply decimation here
if args.decimation:
# Decimate
shift, data = decimate.decimate(
DECIMATION_FACTORS[args.decimation], trace.data)
# Set new sample rate
wsr = int(sr / int(args.decimation))
sf.set_sample_rate(wsr)
trace.sample_rate = wsr
# Set length of trace in samples
sf.set_length_points(len(data))
trace.nsamples = len(data)
if trace.nsamples == 0:
# Failed to read any data
LOGGER.warning("Warning: No data for data\
logger {0} starting at {1}.".format(
das, trace.start_time))
continue
# Read receiver and response tables
receiver_t = trace.receiver_t
if 'response_table_n_i' in array_t[c][t] and\
array_t[c][t]['response_table_n_i'] != -1:
response_t = p5.get_response_t_by_n_i(
int(array_t[c][t]['response_table_n_i']))
else:
response_t = p5.Response_t['rows']
[trace.das_t[0]['response_table_n_i']]
# Set sort_t in segyfactory
sf.set_sort_t(
p5.get_sort_t(start_fepoch, args.station_array))
# Set das_t
sf.set_das_t(trace.das_t[0])
# Line sequence (trace number)
sf.set_line_sequence(i)
i += 1
if response_t:
sf.set_response_t(response_t)
else:
LOGGER.warning(
"No gain or bit weight found in ph5 file.")
if receiver_t:
sf.set_receiver_t(receiver_t)
else:
LOGGER.warning(
"No sensor orientation found in ph5 file.")
# Some informational logging
LOGGER.info("trace: {0}".format(i))
LOGGER.info("-=" * 20)
LOGGER.info("Extracting: Event ID %s" % event_t['id_s'])
LOGGER.info("Chan: {2} Start: {0:s}, Stop: {1:s}.".format(
event_tdoy, end_tdoy, c))
LOGGER.info("Lat: %f Lon: %f Elev:\
%f %s" % (event_t['location/Y/value_d'],
event_t['location/X/value_d'],
event_t['location/Z/value_d'],
event_t['location/Z/units_s'].strip()))
#
# Open SEG-Y file
#
if not fh:
if args.write_stdout:
try:
fh = sys.stdout
except Exception as e:
LOGGER.error("{0}".format(e.message))
LOGGER.error(
"Failed to open STDOUT. Can not continue.")
sys.exit(-1)
else:
#
# Set up file nameing
#
try:
nickname = p5.Experiment_t['rows']
[-1]['nickname_s']
except BaseException:
nickname = "X"
#
base = "{0}_{1}_{2}_{3}".format(
nickname, args.station_array[-3:], sta,
chan_name)
outfilename = "{1:s}/{0:s}_0001.SGY".format(
base, args.out_dir)
# Make sure that the name in unique
j = 1
while os.path.exists(outfilename):
j += 1
tmp = outfilename[:-8]
outfilename = "{0}{1:04d}.SGY".format(tmp, j)
# Open SEG-Y file
try:
fh = open(outfilename, 'w+')
LOGGER.info("Opened: {0}".format(outfilename))
except Exception as e:
LOGGER.error("Failed to open {0}.\t{1}".format(
outfilename, e.message))
sys.exit()
# Write reel headers and first trace
try:
logs = segyfactory.write_segy_hdr(
trace, fh, sf, num_traces)
# Write any messages
for l in logs:
LOGGER.info(l)
except segyfactory.SEGYError as e:
LOGGER.error("Header write failure.")
sys.exit()
else:
# Write trace
try:
logs = segyfactory.write_segy(trace, fh, sf)
for l in logs:
LOGGER.info(l)
LOGGER.info('=-' * 40)
except segyfactory.SEGYError as e:
LOGGER.error("Trace write failure.")
sys.exit()
# Traces found does not match traces expected
if fh and i != num_traces:
# Need to update reel_header
LOGGER.warn("Wrote {0} of {1} traces listed in {2}.".format(
i, num_traces, args.station_array))
sf.set_text_header(i)
fh.seek(0, os.SEEK_SET)
sf.write_text_header(fh)
sf.set_reel_header(i)
fh.seek(3200, os.SEEK_SET)
sf.write_reel_header(fh)
if fh:
fh.close()
def gather():
''' Create event gather '''
if not ARGS.stations_to_gather:
ARGS.stations_to_gather = P5.Array_t[ARGS.station_array]['order']
if ARGS.all_events:
ARGS.evt_list = P5.Event_t[ARGS.shot_line]['order']
for evt in ARGS.evt_list:
try:
if not ARGS.start_time:
event_t = P5.Event_t[ARGS.shot_line]['byid'][evt]
else:
event_t = None
logging.info("Extracting receivers for event {0:s}.".format(evt))
except Exception as e:
logging.warn("Warning: The event {0} not found.\n".format(evt))
continue
#
fh = None
# Initialize
sf = segyfactory.Ssegy(None, event_t, utm=ARGS.use_utm)
# Allow lenght of traces to be up to 2^16 samples long
sf.set_break_standard(ARGS.break_standard)
# Set external header type
sf.set_ext_header_type(ARGS.ext_header)
# Set event information
if event_t:
sf.set_event_t(event_t)
# Event time
event_tdoy = timedoy.TimeDOY(
microsecond=event_t['time/micro_seconds_i'],
epoch=event_t['time/epoch_l'])
Offset_t = P5.read_offsets_shot_order(ARGS.station_array, evt,
ARGS.shot_line)
#Offset_t = P5.calc_offsets (ARGS.station_array, evt, ARGS.shot_line)
else:
event_tdoy = evt
Offset_t = None
logging.warn("Warning: No shot to receiver distances found.")
if ARGS.seconds_offset_from_shot:
event_tdoy += ARGS.seconds_offset_from_shot
end_tdoy = event_tdoy + ARGS.length
# Event start time
start_fepoch = event_tdoy.epoch(fepoch=True)
# Trace cut end time
stop_fepoch = end_tdoy.epoch(fepoch=True)
#
#if event_t :
#Offset_t = P5.read_offsets_shot_order (ARGS.station_array, evt, ARGS.shot_line)
Array_t = P5.Array_t[ARGS.station_array]['byid']
# All channels (components) available for this array
chans_available = P5.channels_Array_t(ARGS.station_array)
# The trace sequence
i = 0
skipped_chans = 0
for sta in ARGS.stations_to_gather:
logging.info("-=" * 20)
logging.info(
"Attempting to find data for station {0}.".format(sta))
# Shot to station information
if Offset_t and Offset_t.has_key(sta):
offset_t = Offset_t[sta]
sf.set_offset_t(offset_t)
# Array geometry
if not Array_t.has_key(sta):
logging.info(
"Warning: The station {0} is not in array {1}.".format(
sta, ARGS.station_array))
continue
array_t = Array_t[sta]
# Filter out unwanted channels
chans = []
for c in ARGS.channels:
if c in chans_available:
chans.append(c)
# Create channel name for output file name
chan_name = ''
for c in chans:
chan_name += "{0}".format(c)
num_traces = len(chans) * len(ARGS.stations_to_gather)
# Loop through channels
for c in chans:
if not array_t.has_key(c):
logging.warn(
"Warning: No channel information for {0} in array {1}."
.format(c, ARGS.station_array))
skipped_chans += 1
continue
try:
# Filter out unwanted seed loc codes
if ARGS.seed_location and array_t[c][0][
'seed_location_code_s'] != ARGS.seed_location:
logging.info(
"Location code mismatch: {0}/{1}/{2}".format(
array_t[c][0]['seed_location_code_s'],
ARGS.seed_location, c))
continue
# Filter out unwanted seed channels
seed_channel_code_s = ph5api.seed_channel_code(
array_t[c][0])
if ARGS.seed_channel and seed_channel_code_s != ARGS.seed_channel:
logging.info(
"Channel code mismatch: {0}/{1}/{2}".format(
array_t[c][0]['seed_channel_code_s'],
ARGS.seed_channel, c))
continue
except:
pass
# Loop for each array_t per id_s and channel
for t in range(len(array_t[c])):
# DAS
das = array_t[c][t]['das/serial_number_s']
# Deploy time
start_epoch = array_t[c][t]['deploy_time/epoch_l']
# Pickup time
stop_epoch = array_t[c][t]['pickup_time/epoch_l']
# Is this shot within the deploy and pickup times
if not ph5api.is_in(start_epoch, stop_epoch,
event_tdoy.epoch(), end_tdoy.epoch()):
logging.info(
"Data logger {0} not deployed between {1} to {2} at {3}."
.format(array_t[c][t]['das/serial_number_s'],
event_tdoy, end_tdoy, sta))
if ARGS.deploy_pickup:
logging.info("Skipping.")
continue
# Read Das table, may already be read so don't reread it
# XXX Debug only
try:
das_or_fail = P5.read_das_t(das,
start_epoch=start_fepoch,
stop_epoch=stop_fepoch,
reread=False)
except:
logging.warn(
"Failed to read DAS: {0} between {1} and {2}.".
format(das, timedoy.epoch2passcal(start_epoch),
timedoy.epoch2passcal(stop_epoch)))
continue
if das_or_fail == None:
logging.warn(
"Failed to read DAS: {0} between {1} and {2}.".
format(das, timedoy.epoch2passcal(start_epoch),
timedoy.epoch2passcal(stop_epoch)))
continue
# Sample rate
if P5.Das_t.has_key(array_t[c][t]['das/serial_number_s']):
sr = float(
P5.Das_t[array_t[c][t]['das/serial_number_s']]
['rows'][0]['sample_rate_i']) / float(
P5.Das_t[array_t[c][t]['das/serial_number_s']]
['rows'][0]['sample_rate_multiplier_i'])
else:
sr = 0. # Oops! No data for this DAS
# Check v4 sample rate from array_t
try:
if sr != array_t[c][0]['sample_rate_i'] / float(
array_t[c][0]['sample_rate_multiplier_i']):
continue
except:
pass
### Need to check against command line sample rate here
if ARGS.sample_rate and ARGS.sample_rate != sr:
logging.warn(
"Warning: Sample rate for {0} is not {1}. Skipping."
.format(das, sr))
continue
sf.set_length_points(int(
(stop_fepoch - start_fepoch) * sr))
### Need to apply reduction velocity here
# Set cut start and stop times
cut_start_fepoch = start_fepoch
cut_stop_fepoch = stop_fepoch
if ARGS.red_vel > 0.:
try:
secs, errs = segyfactory.calc_red_vel_secs(
offset_t, ARGS.red_vel)
except Exception as e:
secs = 0.
errs = "Can not calculate reduction velocity: {0}.".format(
e.message)
for e in errs:
logging.info(e)
cut_start_fepoch += secs
cut_stop_fepoch += secs
#
sf.set_cut_start_epoch(cut_start_fepoch)
sf.set_array_t(array_t[c][t])
#
### Cut trace
# Need to pad iff multiple traces
traces = P5.cut(das,
cut_start_fepoch,
cut_stop_fepoch,
chan=c,
sample_rate=sr,
apply_time_correction=ARGS.do_time_correct)
if len(traces[0].data) == 0:
logging.warn(
"Warning: No data found for {0} for station {1}.".
format(das, sta))
continue
trace = ph5api.pad_traces(traces)
if ARGS.do_time_correct:
logging.info(
"Applied time drift correction by shifting trace by {0} samples."
.format(-1 * sr *
(trace.time_correction_ms / 1000.)))
logging.info("Correction is {0} ms.".format(
trace.time_correction_ms))
logging.info(
"Clock drift (seconds/second): {0}".format(
trace.clock.slope))
for tccomment in trace.clock.comment:
tccmt = tccomment.split('\n')
for tcc in tccmt:
logging.info("Clock comment: {0}".format(tcc))
if trace.padding != 0:
logging.warn(
"Warning: There were {0} samples of padding added to fill gap at middle or end of trace."
.format(trace.padding))
## This may be a command line option later
#if True :
#if trace.response_t :
#try :
#tmp_data = trace.data * trace.response_t['bit_weight/value_d']
#trace.data = tmp_data
#except Exception as e :
#logging.warn ("Warning: Failed to apply bit weight. {0}".format (e.message))
### Need to apply decimation here
if ARGS.decimation:
# Decimate
shift, data = decimate.decimate(
DECIMATION_FACTORS[ARGS.decimation], trace.data)
# Set new sample rate
wsr = int(sr / int(ARGS.decimation))
sf.set_sample_rate(wsr)
trace.sample_rate = wsr
# Set length of trace in samples
sf.set_length_points(len(data))
sf.length_points_all = len(data)
trace.nsamples = len(data)
trace.data = data
# Did we read any data?
if trace.nsamples == 0:
# Failed to read any data
logging.warning(
"Warning: No data for data logger {2}/{0} starting at {1}."
.format(das, trace.start_time, sta))
continue
# Read receiver and response tables
receiver_t = trace.receiver_t
if receiver_t:
sf.set_receiver_t(receiver_t)
else:
logging.warning(
"No sensor orientation found in ph5 file. Contact PIC."
)
# Read gain and bit weight
if array_t[c][t].has_key('response_table_n_i') and array_t[
c][t]['response_table_n_i'] is not -1:
response_t = P5.get_response_t_by_n_i(
int(array_t[c][t]['response_table_n_i']))
else:
response_t = trace.response_t
if response_t:
sf.set_response_t(response_t)
else:
logging.warning(
"No gain or bit weight found in ph5 file. Contact PIC."
)
# Increment line sequence
i += 1
sf.set_line_sequence(i)
sf.set_das_t(trace.das_t[0])
logging.info("=-" * 20)
logging.info("trace: {0}".format(i))
logging.info("Extracted: Station ID {0}".format(sta))
logging.info("Chan: {2} Start: {0:s}, Stop: {1:s}.".format(
event_tdoy, end_tdoy, c))
logging.info("Lat: %f Lon: %f Elev: %f %s" %
(array_t[c][t]['location/Y/value_d'],
array_t[c][t]['location/X/value_d'],
array_t[c][t]['location/Z/value_d'],
array_t[c][t]['location/Z/units_s'].strip()))
logging.info("{0}".format(array_t[c][t]['description_s']))
#
### Open SEG-Y file
#
if not fh:
if ARGS.write_stdout:
try:
fh = sys.stdout
except Exception as e:
logging.error("{0}".format(e.message))
logging.error(
"Failed to open STDOUT. Can not continue.")
sys.exit(-1)
else:
#
### Set up file naming
#
try:
nickname = P5.Experiment_t['rows'][-1][
'nickname_s']
except:
nickname = "X"
#
base = "{0}_{1}_{2}_{3}".format(
nickname, ARGS.station_array[-3:], evt,
chan_name)
outfilename = "{1:s}/{0:s}_0001.SGY".format(
base, ARGS.out_dir)
# Make sure that the name in unique
j = 1
while os.path.exists(outfilename):
j += 1
tmp = outfilename[:-8]
outfilename = "{0}{1:04d}.SGY".format(tmp, j)
# Open SEG-Y file
try:
fh = open(outfilename, 'w+')
logging.info("Opened: {0}".format(outfilename))
except Exception as e:
logging.error(
"Error: Failed to open {0}.\t{1}".format(
outfilename, e.message))
sys.stderr.write(
"Error: Failed to open {0}.\t{1}".format(
outfilename, e.message))
sys.exit()
# Write reel headers and first trace
logs = segyfactory.write_segy_hdr(
trace, fh, sf, num_traces)
# Write any messages
for l in logs:
logging.info(l)
else:
# Write trace
logs = segyfactory.write_segy(trace, fh, sf)
for l in logs:
logging.info(l)
# chan
# Traces found does not match traces expected
if i != num_traces and fh:
# Need to update reel_header
if (num_traces - skipped_chans) < i:
logging.warn(
"Warning: Wrote {0} of {1} trace/channels listed in {2}.".
format(i, num_traces - skipped_chans, ARGS.station_array))
sf.set_text_header(i)
fh.seek(0, os.SEEK_SET)
sf.write_text_header(fh)
sf.set_reel_header(i)
fh.seek(3200, os.SEEK_SET)
sf.write_reel_header(fh)
## Decimation
#if ARGS.decimation :
## Need to update reel_header
#sf.set_sample_rate (wsr)
#sf.set_length_points (trace.nsamples)
#sf.set_text_header (i)
#fh.seek (0, os.SEEK_SET)
#sf.write_text_header (fh)
#sf.set_reel_header (i)
#fh.seek (3200, os.SEEK_SET)
#sf.write_reel_header (fh)
try:
fh.close()
except AttributeError:
pass
