# gcon2con

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Last updated Sun Sep 19 14:20:49 1999

Create a contour file from a GCON data file

## 1. USAGE

gcon2con

## 2. DESCRIPTION

Reads a generalized contour file, usually obtained from

xtract(1), and create a contour file with four columns. By specifiying a file with a list of ship heading, you can rotate the vectors so that the positive x-axis is starbord to the ship track, and positive y-axis is along track. For an explanation of generalized contour files, see con2con(1).

## 3. PARAMETERS

The following parameters must be edited:

gcon_file

  Name of generalized contour file.

con_file

  Name for output contour file.

nav_file

  Name of a file with time and heading columns for rotation of contour velocities. Set it to the empty string to avoid this.

t_nav

  Number of the column in navigation file containing time information.

h_nav

  Number of the column in navigation file containing heading information.

t_gcon

  Number of column in gcon_file containing time information. This is used to synchronize the generalized contour data with navigation information.

i_gcon

  Vector of indexes to columns in gcon_file to print in the output file. To generate a contour output,this will be a list of column numbers like [ x y u v ].

scale

  Multiply velocities by this factor.

## 4. AUTHORS

Pierre Jaccard, Geophysical Institute, University of Bergen, 1999