[Antelope] Steim Compression Error

[Hank Ratzesberger]

Thanks for your interest Kent.

This is the program we use to apply the calib and
copy the data to the new database.  (We use a very
similar program which also calls rotate_to_standard.)
It is called from a Perl script.

Probably a good sign, but I cannot reproduce it in a
minimal example.  We call this program repeatedly from
a script that identifies all the true ZNE channels to
apply the calib to the actual data.

So, I think the issue is not the library, but using it
under load of some kind.  Let me get back to you.

Thanks,
Hank



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Attached is the original file.

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Below is a trace showing the out of place first sample:


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On Nov 8, 2008, at 4:26 PM, Dr. Kent Lindquist wrote:

>
> Hello Hank,
>
> Not to imply that I'm promising to debug and fix this, but the next  
> step that would be nice is to make a very small, completely self- 
> contained data-set; make a tiny little program that runs on it to  
> reproduce the error; then explain precisely how the output of the  
> script differs from what you expect. Also exactly where and from  
> what would you 'drop the first data-point'? From the input, the  
> processed trace structure, or the output? The reproducible example  
> might help someone in the community see exactly what's occurring  
> and help you resolve resolve it.
>
> Best regards,
> Kent
>
>
>
> On Nov 8, 2008, at 6:07 AM, Hank Ratzesberger wrote:
>
>>
>> Hi,
>>
>> We have a program that calls the library routine trapply_calib  
>> then saves
>> the data to a new database.
>>
>> We recently noticed that some resulting traces have point "artifacts"
>> that are way out of range and looked further to find this message
>> in our log files:
>>
>> trcopy_osx: The difference -2147483648 between 0 and -2147483648  
>> near sample #0 cannot be represented in a Steim level 2 compressed  
>> record
>>
>> The program is running on an Intel Mac running Leopard.
>> We are running some more tests to see if the problem does not
>> occur on other platforms.
>>
>> We do not fill gaps.  The problem occurs on files that have no gaps.
>>
>> Any thoughts on why we get this error and what we might do about it?
>> We could always drop the first data point -- if we knew how.
>>
>> Thanks,
>> Hank
>>
>>
>> Hank Ratzesberger
>> NEES at UCSB
>> Institute for Crustal Studies,
>> University of California, Santa Barbara
>> 805-893-8042
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>> Antelope mailing list
>> Antelope at brtt.net
>> http://brtt.net/mailman/listinfo/antelope_brtt.net
>
> --
> Dr. Kent Lindquist                     kent at lindquistconsulting.com
> Lindquist Consulting, Inc.
> 59 College Rd. Suite #7
> Fairbanks, AK 99701              Phone/FAX 907-457-2374
>
> http://www.lindquistconsulting.com
>
>
> _______________________________________________
> Antelope mailing list
> Antelope at brtt.net
> http://brtt.net/mailman/listinfo/antelope_brtt.net

Hank Ratzesberger
NEES at UCSB
Institute for Crustal Studies,
University of California, Santa Barbara
805-893-8042