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| The ASL provides software to allow users to receive near real-time data from the Live Internet
Seismic Server (LISS) and to manipulate that data. The programs are written in C and have been designed
to be as platform-independent as possible. The software has been extensively tested on the Sun Solaris platform,
and should run under most Unix/Linux operating systems. The package is free and includes the programs described
below.
dumpseed - a program that performs a variety of userful functions. For example, it is a LISS client that can be used to connect to the LISS for a given station in order to receive near real-time data (in mini-SEED format). The output from dumpseed can be displayed on the screen, redirected to a file, or piped to another program for further processing. A number of command-line arguments are available to allow the user to control the output. Additionally, dumpseed is a decompression utility that converts mini-SEED data files from binary format into text. This allows users to get data in a format suitable for plotting and graphing. seedfilter - a program that takes as input a mini-SEED file and the name of a 'select' file. Select files are text files with a structured format that allow precise specification of the data to be filtered. The output of seedfilter is data that meets the criteria specified in the select file. seedport - a LISS client program somewhat similar to dumpseed, but designed to write output into files. It has the capability to perform sophisticated filtering that enables the user to specify precisely what data is to be captured. The command-line arguments include options that allow the user to specify the output file name and an optional duration. For example, if the user wants a series of output files, each containing 60 minutes of data, they can use the duration option and the seedport program will start writing its output to a new file each time the duration elapses. seedforker - a program with both client and server functionality. This is particularly useful for users who want to establish many connections to the LISS server, and who want to optimize resource and bandwidth utilization. The seedforker program establishes a connection to a LISS server process for a given station in order to receive data. The user can then connect up to 64 individual clients (e.g. seedport) to the seedforker to access that data. The seedforker client programs operate much faster because the data transfer from the seedforker to client programs is a local process. |
| Follow these steps to download, compile and run the software:
Click here for a list of IP addresses of available stations. |
NOTES: 1. No support for this software is available. Exceptions may be made on a very limited basis. 2. LISS resources are finite, and users needing a large number of connections are expected to use the seedforker utility (see below) if possible to maximize performance and resource utilization, and to minimize the load on the LISS. 3. There are a number of situations where the LISS is temporarily unable to connect to a station and has no data to send to clients. When this occurs, the LISS sends a 'keepalive' message to clients every 5 minutes. (A keepalive message is a 512-byte mini-SEED data record with a sequence number of 000000 and nulls in the rest of the record.) Clients receiving keepalive records SHOULD interpret them as an indication of a positive state of health of the connection, and SHOULD NOT break their connection when such a message is received. |
U.S. Department of the Interior
1.
Download the software