def read_extended_header (self) :
ret = {}
buf = self.read_buf (60)
e = segy_h.Seg (self.endianess)
keys = segy_h.Seg ().__keys__
if self.ext_hdr_type == 'U' :
e = segy_h.Menlo (self.endianess)
keys = segy_h.Menlo ().__keys__
elif self.ext_hdr_type == 'S' :
e = segy_h.Seg (self.endianess)
keys = segy_h.Seg ().__keys__
elif self.ext_hdr_type == 'P' :
e = segy_h.Passcal (self.endianess)
keys = segy_h.Passcal ().__keys__
elif self.ext_hdr_type == 'I' :
e = segy_h.Sioseis (self.endianess)
keys = segy_h.Sioseis ().__keys__
elif self.ext_hdr_type == 'N' :
e = segy_h.iNova (self.endianess)
keys = segy_h.iNova ().__keys__
container = e.parse (buf)
for k in keys :
what = "container.{0}".format (k)
ret[k] = eval (what)
return ret
def print_extended_header(container):
if TYPE == 'U':
keys = segy_h.Menlo().__keys__
elif TYPE == 'S':
keys = segy_h.Seg().__keys__
elif TYPE == 'P':
keys = segy_h.Passcal().__keys__
elif TYPE == 'I':
keys = segy_h.Sioseis().__keys__
elif TYPE == 'N':
keys = segy_h.iNova().__keys__
else:
return None
tt = 180
print "---------- Extended Header ----------"
for k in keys:
what = "container.{0}".format(k)
try:
if tt == 9999: raise
s = SIZEOF[k] / 8
if s < 1: raise
foffset = "{0:<3} - {1:>3}".format(tt, tt + s - 1)
tt += s
except:
tt = 9999
foffset = "{0:<3} - {1:>3}".format('_', '_')
print "{2} {0:<20}\t---\t{1}".format(k, eval(what), foffset)
def set_ext_header_pas(self):
ext = {}
self.extended_header = segy_h.Passcal()
cor_low, cor_high, sort_start_time = self._cor()
if cor_high < -MAX_16 or cor_high > MAX_16:
#print cor_high
cor_high = int(MAX_16)
ext['totalStaticHi'] = cor_high
ext['num_samps'] = int(self.length_points)
ext['max'] = numpy.max(self.data)
ext['min'] = numpy.min(self.data)
ext['samp_rate'] = int((1.0 / self.sample_rate) * 1000000.0)
ext['data_form'] = 1 # 32 bit
# *XXX* Is this also set where the trace is written?
ext['scale_fac'] = float(self.response_t['bit_weight/value_d'])
#ext['scale_fac'] = 1. / 184128195.173
corrected_start_time = self.cut_start_epoch + (cor_low / 1000.0)
m_secs = int(math.modf(corrected_start_time)[0] * 1000.0)
ext['m_secs'] = m_secs
try:
ttuple = time.gmtime([self.event_t['time/epoch_l']])
ext['trigyear'] = ttuple[0]
ext['trigday'] = ttuple[7]
ext['trighour'] = ttuple[3]
ext['trigminute'] = ttuple[4]
ext['trigsecond'] = ttuple[5]
ext['trigmills'] = int(self.event_t['time/micro_seconds_i'] /
1000.0)
except:
pass
try:
try:
ext['inst_no'] = int(
self.array_t['das/serial_number_s']) & 0xFFFF
except ValueError:
ext['inst_no'] = int(self.array_t['das/serial_number_s'], 16)
except:
ext['inst_no'] = 0
try:
ext['station_name'] = string.ljust(
string.strip(self.array_t['id_s']), 6)
except:
ext['station_name'] = string.ljust(
string.strip(self.array_t['das/serial_number_s']), 6)
return ext
def read_extended_header():
buf = FH.read(60)
if TYPE == 'U':
e = segy_h.Menlo(ENDIAN)
elif TYPE == 'S':
e = segy_h.Seg(ENDIAN)
elif TYPE == 'P':
e = segy_h.Passcal(ENDIAN)
elif TYPE == 'I':
e = segy_h.Sioseis(ENDIAN)
elif TYPE == 'N':
e = segy_h.iNova(ENDIAN)
else:
return None
return e.parse(buf)