fk parameter) 'RELATIVE_THRESHOLD (%) = '

This forum is dedicated to discuss all problems and suggestions related to the use of geopsy database and its plugins (array processing, H/V,...).
Post Reply
seguuu91
Posts: 4
Joined: Wed Apr 22, 2020 12:00 pm

fk parameter) 'RELATIVE_THRESHOLD (%) = '

Post by seguuu91 »

Dear, Marc

Is it possible to derive the result of only 90% relative threshold with geopsy-fk tool?

As far as I know, a parameter, RELATIVE_THRESHOLD, does the job.
But, the parameter does not change any of the results.
For now, to make left the result over 90%,
I should fix the relative threshold with the gphistogram filter menu, then export the result manually.
Is there any other way to do that?
Below is the parameter that I used to input.
####################################
PERIOD_COUNT=100
MINIMUM_FREQUENCY=1.8
MAXIMUM_FREQUENCY=7
STEP_FREQUENCY=1.025
MINIMUM_DISTANCE=300
MAXIMUM_DISTANCE=inf
FREQ_BAND_WIDTH=0.1
PROCESS_TYPE=Conventional
BLOCK_COUNT=1
STATISTIC_COUNT=0
MIN_V (m/s)=500
MAX_V (m/s)=10000
RELATIVE_THRESHOLD (%)=90
####################################

admin
Site Admin
Posts: 502
Joined: Mon Aug 13, 2007 11:48 am
Location: ISTerre
Contact:

Re: fk parameter) 'RELATIVE_THRESHOLD (%) = '

Post by admin »

By default 90% threshold is used. So specifying 90% should not change the results. Do you get something different if you set 10%?

Marc

seguuu91
Posts: 4
Joined: Wed Apr 22, 2020 12:00 pm

Re: fk parameter) 'RELATIVE_THRESHOLD (%) = '

Post by seguuu91 »

Thanks for the reply.

Actually I get the identical result with both threshold 10 and 90.
I conduct an additional threshold filter at the filter menu in gphistogram to identify the dispersion.

I thought the parameter and the filter do the same job, don't they?

Y.J.Jeon
Last edited by seguuu91 on Tue Aug 25, 2020 2:41 pm, edited 2 times in total.

admin
Site Admin
Posts: 502
Joined: Mon Aug 13, 2007 11:48 am
Location: ISTerre
Contact:

Re: fk parameter) 'RELATIVE_THRESHOLD (%) = '

Post by admin »

Actually I get the identical result with both threshold 10 and 90.
Strange, I'll check this feature.

You can filter directly from the command line of gphistogram: "-rel-power 0.9", for 90%

Can you show us a few lines of your .max file (data part)? I suspect some issues about the storage of the power.

Effectively, the parameter, the command line argument and the menu do the same task.

Best regards,

Marc

seguuu91
Posts: 4
Joined: Wed Apr 22, 2020 12:00 pm

Re: fk parameter) 'RELATIVE_THRESHOLD (%) = '

Post by seguuu91 »

Sorry for the late reply.
And thanks for the command "-rel-power 0.9", for 90%".

Here are the lines.
#
K_MIN (rad/m)=0.0792626
K_MAX (rad/m)=0.0535314
N_MAXIMA=1
ABSOLUTE_THRESHOLD=0
RELATIVE_THRESHOLD (%)=10
EXPORT_ALL_FK_GRIDS=n
DAMPING_FACTOR=0
#

The threshold written here is '10' but even when it is '90' the result is same.
The attached file is the *.max file.


Best regards,
Y.J.Jeon
Attachments
example.txt
.max file
(5.14 MiB) Downloaded 11 times
Last edited by seguuu91 on Mon Nov 09, 2020 8:07 am, edited 1 time in total.

admin
Site Admin
Posts: 502
Joined: Mon Aug 13, 2007 11:48 am
Location: ISTerre
Contact:

Re: fk parameter) 'RELATIVE_THRESHOLD (%) = '

Post by admin »

Hi

N_MAXIMA is set to 1, hence only the very best peak is kept in .max file. RELATIVE_THRESHOLD becomes effective only if there is more than 1 peak selected. By default N_MAXIMA is set to 2147483647 (INT_MAX).

Best regards,

Marc

Post Reply