# Earthworm Modules:
Liss2ew_scnl Overview

(last revised 30 May 2006)

Liss2ew_scnl is the earthworm module for receiving trace data from the Live Internet Seismic Server. This module was rewritten from the liss2ew by Peter Lombard and converted to C++ when the SCNL modifications were made. This version was contributed by the NEIC HYDRA group and has only been compiled and tested using Windows OS.
The LISS is a very simple service that provides trace data in miniSEED format in near-real-time over the Internet. The liss2ew module will connect to one LISS, read selected streams of trace data, and write that trace data into the earthworm transport ring.

One LISS normally has data for a single station. One or more components are sent together in the data stream. In some cases, one component is provided in more than one sample-rate. The `location code' is used in this case to label the different kinds of data.

The miniSEED format may contain a few other types of blockettes besides the Data-Only blockette. (You can read the PDF version of the SEED manual if you want to know more.) Currently liss2ew ignores these non-trace-data blockettes.

Besides the ASL, there are several other LISS servers. Some digital seismographs produce miniSEED. There is be an earthworm LISS server module, ew2liss. The ew2liss is NOT SCNL compatible yet. This will allow the exchange of earthworm trace data by an alternate format to the current import/export combination.

Module Index | Liss2ew scnl Commands

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