Python Stream.traces[0]方法代码示例

# 需要导入模块: from obspy.core import Stream [as 别名]
# 或者: from obspy.core.Stream import traces[0] [as 别名]
    def read_from_SDS(self, sds_root, net_name, sta_name, comp_name,
                      starttime=None, endtime=None, rmean=False, taper=False,
                      pad_value=None):
        """
        Read waveform data from an SDS structured archive.  Simple overlaps and
        adjacent traces are merged if possile.

        :param sds_root: root of the SDS archive
        :param net_name: network name
        :param sta_name: station name
        :param comp_name: component name
        :param starttime: Start time of data to be read.
        :param endtime: End time of data to be read.
        :param rmean: If ``True`` removes the mean from the data upon reading.
            If data are segmented, the mean will be removed from all segments
            individually.
        :param taper: If ``True`` applies a cosine taper to the data upon
            reading.  If data are segmented, tapers are applied to all segments
            individually.
        :param pad_value: If this parameter is set, points between
            ``starttime`` and the first point in the file, and points between
            the last point in the file and ``endtime``, will be set to
            ``pad_value``.  You may want to also use the ``rmean`` and
            ``taper`` parameters, depending on the nature of the data.

        :type sds_root: string
        :type net_name: string
        :type sta_name: string
        :type comp_name: string
        :type starttime: ``obspy.core.utcdatetime.UTCDateTime`` object,
            optional
        :type endtime: ``obspy.core.utcdatetime.UTCDateTime`` object, optional
        :type rmean: boolean, optional
        :type taper: boolean, optional
        :type pad_value: float, optional

        :raises UserWarning: If there are no data between ``starttime`` and
            ``endtime``

        """

        logging.info("Reading from SDS structure %s %s %s ..." %
                     (net_name, sta_name, comp_name))

        # Get the complete file list. If a directory, get all the filenames.
        filename = os.path.join(sds_root, net_name, sta_name,
                                "%s.D" % comp_name, "*")
        logging.debug("Reading %s between %s and %s" %
                      (filename, starttime.isoformat(), endtime.isoformat()))
        if os.path.isdir(glob.glob(filename)[0]):
            filename = os.path.join(filename, "*")
        file_glob = glob.glob(filename)

        # read header from all files to keep only those within the time limits
        fnames_within_times = []
        for fname in file_glob:
            st_head = stream.read(fname, headonly=True)
            # retrieve first_start and last_end time for the stream
            # without making any assumptions on order of traces
            first_start = st_head[0].stats.starttime
            last_end = st_head[0].stats.endtime
            # find earliest start time and latest end time in stream
            for tr in st_head:
                if tr.stats.starttime < first_start:
                    first_start = tr.stats.starttime
                if tr.stats.endtime > last_end:
                    last_end = tr.stats.endtime
            # add to list if start or end time are within our requested limits
            if (first_start < endtime and last_end > starttime):
                fnames_within_times.append(fname)

        logging.debug("Found %d files to read" % len(fnames_within_times))

        # now read the full data only for the relevant files
        st = Stream()
        for fname in fnames_within_times:
            st_tmp = read(fname, starttime=starttime, endtime=endtime)
            for tr in st_tmp:
                st.append(tr)
        # and merge nicely
        st.merge(method=-1)

        if st.count() > 1:  # There are gaps after sensible cleanup merging
            logging.info("File contains gaps:")
            st.printGaps()

        # apply rmean if requested
        if rmean:
            logging.info("Removing the mean from single traces.")
            st = stream_rmean(st)

        # apply rmean if requested
        if taper:
            logging.info("Tapering single traces.")
            st = stream_taper(st)

        if not pad_value is None:
            try:
                first_tr = st.traces[0]
                # save delta (to save typing)
#.........这里部分代码省略.........