wfdisc
The wfdisc table contains a waveform header file and descriptive information. This table provides a pointer (or index) to waveforms stored on disk. The waveforms themselves are stored in ordinary disk files as a sequence of sample values (usually in binary representation).
|
FIELD |
COLUMN |
STORAGE |
EXTERNAL |
CHARACTER |
DESCRIPTION |
|
NUMBER |
TYPE |
FORMAT |
POSITION |
||
|
1 |
sta |
varchar2(6) |
a6 |
1-6 |
station code |
|
2 |
chan |
varchar2(8) |
a8 |
8-15 |
channel code |
|
3 |
time |
f1oat(53) |
f17.5 |
17-33 |
epoch time of first sample in file |
|
4 |
wfid |
number(9) |
i9 |
35-43 |
waveform identifier |
|
5 |
chanid |
number(8) |
i8 |
45-52 |
channel identifier |
|
6 |
jdate |
number(8) |
i8 |
54-61 |
julian date |
|
7 |
endtime |
f1oat(53) |
f17.5 |
63-79 |
time +(nsamp -1 )/samles |
|
8 |
nsamp |
number(8) |
is |
81-88 |
number of samples |
|
9 |
samprate |
f1oat(24) |
f11.7 |
90-100 |
sampling rate in samples/sec |
|
10 |
calib |
f1oat(24) |
f16.6 |
102-117 |
nominal calibration |
|
11 |
calper |
f1oat(24) |
f16.6 |
119-134 |
nominal calibration period |
|
12 |
instype |
varchar2(6) |
a6 |
136-141 |
instrument code |
|
13 |
segtype |
varchar2(1 ) |
a1 |
143-143 |
indexing method |
|
14 |
datatype |
varchar2(2) |
a2 |
145-146 |
numeric storage |
|
15 |
clip |
varchar2(1 ) |
a1 |
148-148 |
clipped flag |
|
16 |
dir |
varchar2(64) |
a64 |
150-213 |
directory |
|
17 |
dfile |
varchar2(32) |
a32 |
215-246 |
data file |
|
18 |
foff |
number(10) |
i10 |
248-257 |
byte offset of data seg ment within file |
|
19 |
commid |
number(9) |
i9 |
259-267 |
comment identifier |
|
20 |
Iddate |
date |
a19 |
269-287 |
load date |
|
Keys: |
Primary |
wfid, dir, dfile |
|
|
Unique |
wfid |
|
|
Foreign |
chanid, commid |
|
|
|
|
|
Data: |
Descriptive |
sta, chan, dir, dfile, foff |
|
|
Measurement |
time, jdate, endtime, nsamp, samprate, calib, calper, instype, segtype, data type, clip |
|
|
Administrative |
lddate |
Iddate