btnav2

1. SYNOPSIS

databtnav2(year_base, data_file, ps_file, plot_title, note )

2. DESCRIPTION

This Matlab function makes a plot of NAV anf BT velocities for comparions. The input ASCII file can be generated with the xtract(1) utility and must have the following columns:

1. Time in decimal days
2. Longitude in degrees
3. Latitude in degrees
4. U ship from ACCESS_VARIABLES
5. V ship from ACCESS_VARIABLES
6. Longitude from NAVIGATION
7. Latitude from NAVIGATION
8. Speed (in m/s) from NAVIGATION
9. Direction from NAVIGATION
10. U from BOTTOM_TRACK
11. V from BOTTOM_TRACK
12. Depth from BOTTOM_TRACK

The return value data is an array with the data from the input file, with the additionnal columns:

1. Ship speed
2. Ship direction
3. NAV eastward velocity
4. NAV northward velocity
5. BT speed
6. BT direction

3. PARAMETERS

year_base

Base year corresponding to the times in the input file.

data_file

Name of input data file.

ps_file

Name for output postscript file.

plot_title

Title for plot.

note

Additionnal string to be printed on the plot.

4. RETURNS

This function returns an array with the data from the input data file an the addiionnal columns described above.

5. AUTHORS

Pierre Jaccard, Geophysical Institute, University of Bergen, 1999