Month: February 2007

Sigsbee2 models

February 19, 2007 Documentation No comments

Sigsbee2 models by Trevor Irons is another piece of the data documentation project at the Colorado School of Mines.

Scientific Software Day in Austin

February 19, 2007 Celebration No comments

“Madagascar” will be presented at the Scientific Software Day in Austin alongside other software projects. Attendance is free, but registration is required.

How to make RSF files easy to fetch from FTP servers?

February 15, 2007 FAQ 1 comment

An RSF “file” typically consists of 2 parts: the binary file, where data values are stored, and the header file (text), where data attributes are put (see RSF file format page for more details). To prepare such file for distribution, it is recommended to 1) make the binary part architecture independent so that data can be downloaded on heterogeneous computer systems, and 2) pack the binary and header parts. Such result is achieved by using the sfdd program to convert the binary part to XDR format and, at the same time, to pack the two parts. See the example below.


How do I find programs in madagascar?

February 13, 2007 FAQ No comments

Try sfdoc -k <keyword>. For example,

bash$ sfdoc -k velocity
sfexgr: Exact group velocity in VTI media
sfchebvc: Post-stack 2-D velocity continuation by Chebyshev-tau method.
sfagmig: Angle-gather constant-velocity time migration.
sffourvc2: Velocity continuation with semblance computation.
sfdix: Convert RMS to interval velocity using LS and shaping regularization.
sfconstfdmig2: 2-D implicit finite-difference migration in constant velocity.
sfpwdix: Convert RMS to interval velocity using LS and plane-wave construction.
sfdixshape: Convert RMS to interval velocity using LS and shaping regularization.
sfpveltran: Slope-based velocity transform.
sfvelcon: Post-stack velocity continuation by implicit finite differences
sfvscan: Velocity analysis.
sfvelmod: Velocity transform.
sfpreconstkirch: Prestack Kirchhoff modeling/migration in constant velocity.
sfunif2: Generate 2-D layered velocity model from specified interfaces.
sfunif3: Generate 3-D layered velocity model from specified interfaces.
sffourvc: Velocity continuation.
sfimospray: Inversion of constant-velocity nearest-neighbor inverse NMO.
sfvelcon3: 3-D finite-difference velocity continuation on a helix 

If some program description attracts your attention, run the program without arguments for a self-doc, then follow examples in the USED IN section to observe how it was used. Alternatively, use the web interface.
sfdoc -k .” produces a full list of all programs.

New pages on the Wiki

February 10, 2007 Documentation No comments

The Advanced installation and Why Madagascar? pages are ready to receive visitors. Helpful corrections and additions are welcome! One of the parts that stand to benefit the most from reader contributions is the Platform-specific installation advice section.
As the number of pages on the Wiki grows, the navbar starts becoming insufficient for proper organization of all documentation. A top-down view of all materials about Madagascar is also useful for determining whether gaps in coverage exist. So I started a Madagascar Manual. Feel welcome to contribute! How nice would it be, and what publicity would bring, calling this manual “Reproducible research and processing with Madagascar” and getting it on SEG Bookmart’s shelf, like SU people did 🙂

Curvelet transform

February 9, 2007 Programs 1 comment

sffdct, the Madagascar wrapper for the Fast Discrete Curvelet Transform (FDCT), is added to the collection of Madagascar programs. See an example in book/slim/rsf/sffdct.

Note that sffdct requires:

BEG Annual Report

February 3, 2007 Celebration No comments

A story on Madagascar was featured in the 2006 Annual Report of the Bureau of Economic Geology (BEG) at the University of Texas at Austin. BEG lists Madagascar among its public resources.

Pluto model

February 2, 2007 Documentation No comments

Pluto model by Trevor Irons is another piece of the data documentation project at the Colorado School of Mines.