15 May
2014
15 May
'14
11:59 a.m.
Thomas,
I changed my configurator which looks like this now :
startdate : 1970-01-01
enddate : 2100-01-01
analysis duration : 86400
cc_sampling_rate : 200
resampling_method : Decimate
decimation_factor : 2
preprocess_lowpass : 45
preprocess_highpass : 1
maxlag : 120
corr_duration : 1800
windsorizing : 3
crondays : -1
autocorr : N
keep_all : Y
keep_days : Y
ref_begin : -100
ref_end : 0
export_format : BOTH
sac_format : doublets
And my filter :
low : 45
mwcs_low : 45
high : 1
mwcs_high : 1
rms_treshold : 0
mwcs_len : 10
mwcs_step : 5
I’m not sure of getting what you meant by “same for the following”.
Now, I get the error :
2014-05-15 11:52:01,333 [DEBUG] Processing pair: AN.LF1 vs AN.LF2
<msnoise_table_def.Station object at 0x4a94950>
<msnoise_table_def.Station object at 0x4a9f110>
Traceback (most recent call last):
File "s03compute_cc.py", line 405, in <module>
trame2h[i], Nfft, dt, low, high, plot=False)
File "/home/stag01/Bureau/MSNoise-1.2.3/whiten.py", line 58, in whiten
low = J[0] - Napod
IndexError: index out of bounds
Thanks.
Sébastien
On 15 mai 2014, at 11:22, Thomas Lecocq <thomas.lecocq(a)oma.be> wrote:
Sébastien,
Le 15/05/2014 11:07, Sébastien Carniato a écrit :
Hi Thomas,
before talking about my problems, I’d like to introduce my data, and the configurator’s
“configuration” I use.
I study mining data. The scale is totally different from the initial purpose of Msnoise,
and I think is one of the reasons of a lot of problem I’m facing..
There are 3 stations, which are around 200 meters away from each other, and at the same
altitude. They record data with a 200 Hz samplerate.
In my database, I’ve chosen for each station 2 days of recording (the end of the first
day does not correspond exactly to the beginning of the second day), with X,Y,Z channels.
The length of each records is approximatively 24 hours.
Here’s the structure of my database folder (all files are SAC files) :
LF1.AN..X.2011.003
LF1.AN..Y.2011.003
LF1.AN..Z.2011.003
LF1 LF1.AN..X.2011.004
LF1.AN..Y.2011.004
LF1.AN..Z.2011.004
LF2.AN..X.2011.003
LF2.AN..Y.2011.003
LF2.AN..Z.2011.003
AN LF2 LF2.AN..X.2011.004
LF2.AN..Y.2011.004
LF2.AN..Z.2011.004
LF3.AN..X.2011.003
LF3.AN..Y.2011.003
LF3 LF3.AN..Z.2011.003
LF3.AN..X.2011.004
LF3.AN..Y.2011.004
LF3.AN..Z.2011.004
The configurator I use (only the inserts which are (I guess) important for compute_cc :
startdate : 1970-01-01
enddate : 2100-01-01
analysis duration : 86400
cc_sampling_rate : 200
resampling_method : Decimate
decimation_factor : 2
preprocess_lowpass : 1
preprocess_highpass : 80
maxlag : 120
corr_duration : 1800
windsorizing : 3
crondays : -1
autocorr : N
keep_all : Y
keep_days : Y
ref_begin : -100
ref_end : 0
export_format : BOTH
sac_format : doublets
OK, here there is a big problem ! The lowpass freq should be bigger than the highpass
freq. You inverted the two. Then, if you want your CC to occur up to 80Hz, you cannot
decimate the data at 100Hz. If you want to process at 100Hz (the output CC will be 100Hz
sampled), you have to set up:
preprocess_highpass: 1
preprocess_lowpass: 45 (so, somewhat smaller than the resulting Nyquist)
Same for the following, if you have 100Hz CC, you'll have information up to 50Hz,
not 80.
Hope this helps,
Thomas
The filter configuration I use :
low : 10
mwcs_low : 10
high : 80
mwcs_high : 80
rms_treshold : 0
mwcs_len : 10
mwcs_step : 5
My problems :
The folder CROSS_CORRELATIONS is created, as well as the STACK folder.
Problem 1 : When I plot the mseed files in CROSS_CORRELATION, i get nothing… the files
are not empty (324 Kio), but there’s nothing in the plot window.
Problem 2 : When I plot the SAC (or MSEED) file in STACKS/00/001_DAYS folder, here is
what I get :
It’s indeed a symmetric signal… which looks more like an autocorrelation, doesn’t it ?
Here’s what I get if I zoom on it :
Thanks for your help Thomas.
Sébastien.
PS : I had to change for each file in its header, the name of the station, and the
component, which were false (thanks to the mining data). Do you think it can be the source
of any bug ?
On 14 mai 2014, at 09:19, Thomas Lecocq <thomas.lecocq(a)oma.be> wrote:
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http://mailman-as.oma.be/mailman/listinfo/msnoise Sébastien,
(FW to the ML, as this could be useful for many):
Le 13/05/2014 16:10, Sébastien Carniato a écrit :
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http://mailman-as.oma.be/mailman/listinfo/msnoise Hi Thomas,
thank you for your quick answer !
Indeed, it works when I use only Decimate. I have to check again, but I think indeed that
my data stream are using the same sample rate.
You can also check that with the
SQLiteManager (group data_availability by "sampling_rate")
I have a bench of other questions :
*Question 1 : *So now that compute_cc works :), _I would like to know if the correlations
computed are stored_, and in that case where ? I put the output folder on my desk with the
configurator, but nothing was created so far...
If you set "keep_all" to
"Y", the 30 minutes CC are stored in the CROSS_CORRELATION folder, named
"hh_mm.cc", and these are miniseed files (I know, bad naming, this is going to
change in the future).
*Question 2 :* My data are not continuous. Indeed
they are a lot of days missing, and the maximum length of recording is one day and a half.
_Is it a problem for running MSNoise_ ?
Well, MSNoise does correlate M minutes (30
minutes by default) windows, if data is missing, the CC will be corrupted (NaN or infs)
and will not be stored. So, normally no problem. BUT, expect results to be quite strange
if you have ony like 20% of the day filled with good data.
*Question 3 :* The only way to get a filter is to
create one with the sqlite manager. Is it normal ?
No, there is a bug in the
Configurator which doesn't show any empty line.
*
*
*Question 4 : *and the last one : Now when I launch compute_cc, i get the error :
2014-05-13 16:04:21,314 [INFO] *** Starting: Compute CC ***
2014-05-13 16:04:21,354 [INFO] Will compute ZZ
2014-05-13 16:04:21,479 [INFO] New CC Job: 2011-01-18 (6 pairs with 3 stations)
AN.LF1:AN.LF1
2014-05-13 16:04:21,595 [DEBUG] Processing pair: AN.LF1 vs AN.LF1
<msnoise_table_def.Station object at 0x4a06ed0>
<msnoise_table_def.Station object at 0x4a06ed0>
s03compute_cc.py:407: DeprecationWarning: using a non-integer number instead of an
integer will result in an error in the future
trames2hWb[i] = np.zeros(Nfft)
s03compute_cc.py:407: DeprecationWarning: using a non-integer number instead of an
integer will result in an error in the future
trames2hWb[i] = np.zeros(Nfft)
/home/stag01/Bureau/MSNoise-1.2.3/myCorr.py:68: RuntimeWarning: invalid value encountered
in divide
corr /= np.real(normFact)
Traceback (most recent call last):
File "s03compute_cc.py", line 412, in <module>
"%Y-%m-%d", time.gmtime(basetime + itranche * min30 / fe))
NameError: name 'basetime' is not defined
Do you know what can be the source of the problem ?
Well, first, you should not do
Autocorrelation with this version of MSNoise. It'll work normally, but the result is
wrong. I'll push a new release very soon that corrects that. But, this problem seems
independent. Reading your next mail, it could be related to the file reading part, but it
does look strange...
Best regards,
Thomas
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