# hdgdiff

##

Last updated Sun Sep 19 11:54:30 1999

- Compare mean and end ping heading data

## 1. SYNOPSIS

hdgdiff(year_base, asc_file, plot_title, note )

## 2. DESCRIPTION

Plot of heading differences vs. time, and calculate statistical data about these. Differences are checked to be less than a maximal allowed threshold value (this may happen sometimes if the system delivering heading information has a malfunction). These points are plotted with a cross.

Input data file must contain the following columns:

1. End ping GPS time
2. Mean ping heading
3. End ping heading

## 3. PARAMETERS

year_base

  Base year used for the decimal times in input file.

asc_file

  Input data file.

plot_title

  Title for the plot.

note

  Additionnal string to print on the plot.

## 4. FILES

- hdg_diff.ps

## 5. AUTHORS

Pierre Jaccard, Geophysical Institute, University of Bergen, 1999