simplemseed 0.4.0

miniseed3 in pure python

simplemseed

Miniseed3 (and miniseed2) in pure python.

Read the docs at readthedocs

Installation

simplemseed can be installed in conda environments from conda-forge ..

$ conda install --channel conda-forge simplemseed

.. or from pypi using pip:

$ pip install simplemseed

Miniseed3

Write and read mseed3 records like:

#!/usr/bin/env python3

from simplemseed import MSeed3Header, MSeed3Record, FDSNSourceId, readMSeed3Records

data = [(i % 99 - 49) for i in range(0, 1000)]
header = MSeed3Header()
header.starttime = "2024-01-01T15:13:55.123456Z"
header.sampleRatePeriod = 20
sid = FDSNSourceId.createUnknown(header.sampleRatePeriod)
ms3record = MSeed3Record(header, sid, data)

ms3filename = "test.ms3"
with open(ms3filename, "wb") as of:
    of.write(ms3record.pack())
    print(f"  save: {ms3record.details()} ")
    print(f"    to: {ms3filename} ")
print()
with open(ms3filename, "rb") as infile:
    for readms3record in readMSeed3Records(infile):
        print(f"  extract: {readms3record.details()} ")
        print(f"     from: {ms3filename} ")

Access uncompressed timeseries data as numpy ndarray with:

dataArray = ms3record.decompress()

Also includes compression and decompression for primitive data arrays and for Steim1 and Steim2, in pure python.

Miniseed2:

Read miniseed2 with:

with open(ms2filename, "rb") as inms2:
    for ms2rec in simplemseed.readMiniseed2Records(inms2):
        print(ms2rec.summary())

or read and convert to miniseed3:

with open(ms3filename, "wb") as outms3:
    with open(ms2filename, "rb") as inms2:
        for ms2rec in simplemseed.readMiniseed2Records(inms2):
            ms3rec = simplemseed.mseed2to3(ms2rec)
            outms3.write(ms3rec.pack())

Command line tools:

Miniseed3 Details

Print details about each miniseed3 record

mseed3details casee.mseed3
          FDSN:CO_CASEE_00_H_H_Z, version 4, 285 bytes (format: 3)
                       start time: 2023-06-17T04:53:54.468392Z (168)
                number of samples: 104
                 sample rate (Hz): 100.0
                            flags: [00000000] 8 bits$
                              CRC: 0x4D467F27
              extra header length: 31 bytes
              data payload length: 192 bytes
                 payload encoding: STEIM-2 integer compression (val: 11)
                    extra headers:

Total 104 samples in 1 records

Getting and setting extra header values

% mseed3details --get "/FDSN/Time" casee_two.ms3
  {"Quality": 0}
% mseed3details --getall "/FDSN/Time/Quality" casee_two.ms3 --verbose
file: casee_two.ms3
FDSN:CO_CASEE_00_H_H_Z 2023-06-17T04:53:50.008392Z 2023-06-17T04:53:50.178392Z (18 pts)
  0
FDSN:CO_CASEE_00_H_H_Z 2023-06-17T04:53:50.188392Z 2023-06-17T04:53:55.498392Z (532 pts)
  0
% mseed3details --set "/data" '{ "key": "val", "keyb": 3 }' casee_two.ms3
% mseed3details --getall "/data" casee_two.ms3 --verbose
file: casee_two.ms3
FDSN:CO_CASEE_00_H_H_Z 2023-06-17T04:53:50.008392Z 2023-06-17T04:53:50.178392Z (18 pts)
  {"key": "val", "keyb": 3}
FDSN:CO_CASEE_00_H_H_Z 2023-06-17T04:53:50.188392Z 2023-06-17T04:53:55.498392Z (532 pts)
  pointer not found in extra headers
% mseed3details --setall "/data" '{ "key": "else", "keyb": 4 }' casee_two.ms3
% mseed3details --set "/data/keyb" 42 casee_two.ms3
% mseed3details --getall "/data" casee_two.ms3 --verbose
file: casee_two.ms3
FDSN:CO_CASEE_00_H_H_Z 2023-06-17T04:53:50.008392Z 2023-06-17T04:53:50.178392Z (18 pts)
  {"key": "else", "keyb": 42}
FDSN:CO_CASEE_00_H_H_Z 2023-06-17T04:53:50.188392Z 2023-06-17T04:53:55.498392Z (532 pts)
  {"key": "else", "keyb": 4}

Merge mseed3 records

• merge contiguous, in order, mseed3 records into larger records. Decompression is needed as steim1 and 2 cannot be merged without decompression, primitive types are already decompressed.

mseed3merge -o merged.ms3 --decomp  bird_jsc.ms3

Convert miniseed 2 to miniseed3.

Note most blockettes are ignored, other than 100, 1000, 1001

mseed2to3 --ms2 casee.ms2 --ms3 casee.ms3

FDSN sourceid

Parse FDSN sourceids

Split a FDSN source id:

fdsnsourceid FDSN:CO_JSC_00_H_H_Z
      FDSN:CO_JSC_00_H_H_Z
       Net: CO
       Sta: JSC
       Loc: 00
      Band: H - High Broadband, >= 80 to < 250 Hz, response period >= 10 sec
    Source: H - High Gain Seismometer
 Subsource: Z

Describe a band code:

fdsnsourceid -b Q
      Band: Q - Q - Greater than 10 days , < 0.000001 Hz

Find the correct band code for a sample rate:

fdsnsourceid --sps 87
      Rate: 87.0 - H - H - High Broadband , >= 80 to < 250 Hz, response period >= 10 sec
      Rate: 87.0 - E - E - Extremely Short Period, >= 80 to < 250 Hz, response period < 10 sec

Describe a source code:

fdsnsourceid --source H N
    Source: H - High Gain Seismometer
       Measures displacement/velocity/acceleration along a line defined by the the dip and azimuth.
    Source: N - Accelerometer
       Measures displacement/velocity/acceleration along a line defined by the the dip and azimuth.

Examples

There are more examples in the examples directory.