BROT

One runs the gobrot bash script and this produces files brotL001.seg through brotL146.seg in this example. The command line arguments are:
  brot infil itrx itry iopt iangle  
  
 infil:   =input file name 
 itrx:    =trace number for x-axis (example, 2) 
 itry:    =trace number for y-axis (example, 3) 
 iopt:    =rotation option 
         0=user supplied rotation angle  
         1=Transverse Alignment: chan 3 aligned to 6
         2=Radial Alignment:     chan 2 aligned to 5 
 iangle:  =user supplied rotation angle from x-axis
One only needs to add an iangle parameter with the iopt=0 option. For each *.seg file rotated, there will also be a *.lst file output. The *.lst file shows what iangle value has been used based on the headers for options 1 or 2.

NOTE: BSU codes like this one assumes that the channel order in down-hole surveys matches those of the author. See section 6.7.2 of the BSU Users Guide (bsu-user-guide3-1.pdf) for more on this topic. Figure 90 illustrates the author's notation and wiring, and is taken from the BSU user guide. A discussion on Principal Component Analysis (PCA) is found in the literature (Michaels, 2001b).

Once the gobrot script is run, the rotated data will have names brotL001.seg through brotL146.seg in this example. A good practice is to create a child directory, brot and move the brotxxxx.seg files to that directory before doing further analysis. This will preserve clarity on which files have been rotated, and which files are as recorded.

Figure 90: The author's orientations and notation for down-hole surveys. Note that the reference and bore-hole phones are wired differently (in terms of R- and T-component wiring).
\includegraphics[scale=.8]{Figurebrot.pdf}