International Federation of Digital Seismograph Networks
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FDSN Working Group II

Data Format, Data Centers and Software

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Active Message Threads for May 2016

Tim Ahern
Template for making proposed change to the miniSEED DEADLINE FOR COMMENTS MAY 31, 2016
2016-05-10 17:04:06 - 2016-05-31 21:34:46
Comments Must Be Submitted to WG II list (fdsn-wg2-data@lists.fdsn.org) by May 31, 2016 I apologize for the delay in getting this information out to everyone. I am attaching the following items 1) The agenda for our meeting in Vienna 2) The next generation of miniSEED document - this is the straw man and is currently Version 2016­-3­-30 3) The rationale for the recommended changes 4) The process proposed at the EGU meeting and it is the process we will follow 5) the Excel template in w… [more]
Replies
Philip Crotwell
java implementation of strawman
2016-05-14 00:24:34
Hi I have put together a java implementation of the strawman 2016-3-30 here: https://github.com/crotwell/seisFile/tree/miniseed3/src/main/java/edu/sc/seis/seisFile/mseed3 There is nothing like actually trying to implement something in code to help see how a spec really works. For what it is worth, I feel like the strawman is much, much improved over the old miniseed2. It is so much simpler and easier to code. I feel that the reduced complexity will make it much less likely that weird and subt… [more]
No replies
Philip Crotwell
add warning that time order is tricky near leap seconds
2016-05-13 20:56:54
If sub 1 second packets are used, start times during/near leap seconds may not be in numerical order. Just add warning to docs. Philip
No replies
Philip Crotwell
start time leap second bit misidentified
2016-05-13 20:41:40
Hi Small change in text, start time leap second bit is bit 1 not bit 2. Philip
No replies
Philip Crotwell
Next generation miniSEED: add U, user modified, data quality indicator
2016-05-12 22:00:34 - 2016-05-13 15:54:12
Propose to add U as a legal data quality value, indicating user modification as opposed to data center modification. Existing data quality values mostly pertain to data centers. Adding a value to explicitly say the user has modified the data would allow the user to tell processed data from data center "original" data and also allow the user to use the data version field to track their changes. So Q2 data means the data center did a change in quality control, while a U3 means the user has modi… [more]
Replies
Philip Crotwell
Next generation miniSEED: combine loc id and channel codes into one field
2016-05-12 21:15:22 - 2016-05-13 15:53:27
Hi Spreadsheet is attached. But as reading in a spreadsheet is painful, here is the idea: Loc ids give namespace to channel codes, but were separate due to constraints of seed. It would be more logical to combine the two into a single field. Propose that this be 8 chars where it can be of the form: BIO, LLBIO, LLBIIO, LLLLBIO, or LLLLBIIO where L is locid, B is band code, I is instrument code and O is orientation code. This preserves naming for older channels, with and without locids, and pro… [more]
Replies
Philip Crotwell
move Flags header to beginning of header
2016-05-12 23:29:56
The Flags header byte contains the byte ordering of the header. Since the you need the byte order to extract the rest of the header, it makes sense to move it to the front of the header so reading software does not have to read ahead to get this value. Byte 4 seems the best place, immediately after the header version field, but it should be at least before the first multi-byte binary header field. thanks Philip
No replies
Ishika Chowdhury
Requesting data from BI network
2016-05-11 01:12:34
Hello,I am working a faculty member at the Bangladesh University of Engineering and Technology. I am currently doing research on seismic hazard assessment of Bangladesh. I would like to have the data from your seismograph network at Bangladesh, the network code is BI. From your website I could not figure out how to request data for a specific station or event. Can you please help me in this regard? Best Regards   Ishika Nawrin Chowdhury Lecturer BUET-Japan Institute of Disaster Prevention and … [more]
No replies