User's Manual

Command lines for advanced users (PD-09.01)

Page 2 of 4

January 28, 2016

II. Command lines for data processing

A. Head correction

npinit is a script to perform head correction. Put the following code into the terminal:

cd /data/recorder/current/

npinit rawpos/0011.pos 3003

Figure 1: scheme to select the reference sensors

This is an example of how to set sensors 1 and 4 from sweep 11 as reference sensors for the

head correction.

npinit rawpos/0001.pos 33

This is an example of how to set sensors 1 and 2 from sweep 1 as reference sensors for the head

correction.

All sweeps within the rawpos folder will be corrected and stored in the pos folder now.

“3” defines the type of head correction.

Figure 2: screen output during head correction

Filtering is ON by default. The filter files can be found in "/opt/age/bin/filter/".

Extensive options for creating a reference object and performing head correction provides the

program normposcmd. Run normposcmd –h for a detailed description of usage and options.