SEISPP Library home page.

SEISPP is an object-oriented software library for handling seismic data of a range of scale. That is, it was designed to be general enough to cover a large range of problems that use seismic data. Seismic data are always recorded as time series data, which implies digital sampling of on a uniformly spaced time grid (fixed sample rate). Data are commonly recorded as scalar samples or vector (three-component) samples. SEISPP aims to support both major classes of data through a reasonably consistent interface.

The SEISPP library centers on data and processing object concepts. A data object is a container whose entire purpose is to encapsulate a particular type of data. Examples here are the TimeSeries and ThreeComponentSeismogram objects. This library also has entities I call "processing objects" in the documentation. A processing object takes a data object and does something to it. Two models of processing objects are found here. Algorithms that commonly take one data object, modify it's contents, and then produce a modified version of the same basic type of data utilize an "apply" method. An apply method is a function that takes object x, modifies it, and returns a new object y usually of the same type as the parent. In contrast, some algorithms are better done with the creations is initialization method. That is, the constructor for the object implements the computational algorithm. This approach is most appropriate when the computational algorithm yields a fundamentally different data type than the parent. A good example in the library is the Stack object. A Stack is constructed from an input ensemble of data and yields data contained within the Stack object itself. Calling the constructor for the Stack object creates it from data.

The library is written in C++ with a few ancillary plain C procedures. It has no support for FORTRAN and none is planned. C programmers should be aware that any plain C program that follows ansii standards will compile in C++. Thus, you can use objects in this library as components of plain C programs if you compile your main program with g++ or CC (Solaris) instructing the linker to use the compiled library libseispp.a produced by running make in this directory.

The current library has a strong dependence on the Antelope package. Antelope is a seismic data processing package widely used in the US academic community through an envelope agreement with the IRIS consortium. The package will not compile without access to Antelope include files and no program that uses this package will link and run without Antelope. The API was designed, however, to have only a weak dependence upon Antelope. It is my perspective that it would be relatively easy to strip out the Antelope dependencies if for most of the package, although some key methods would require an extensive rewrite to work around the large number of dependencies. In short, possible but a nontrivial job.

To download this software go to the CVS web repository for the Antelope User Group to download the SEISPP library and related software.

Author:

Gary L. Pavlis

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