btnav2(3m)

NAME
btnav2 - Comparison of NAV and BT velocities

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

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: Time in decimal days Longitude in degrees Latitude in degrees U ship from ACCESS_VARIABLES V ship from ACCESS_VARIABLES Longitude from NAVIGATION Latitude from NAVIGATION Speed (in m/s) from NAVIGATION Direction from NAVIGATION U from BOTTOM_TRACK V from BOTTOM_TRACK Depth from BOTTOM_TRACK The return value data is an array with the data from the input file, with the additionnal columns: Ship speed Ship direction NAV eastward velocity NAV northward velocity BT speed BT direction

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.

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

AUTHORS
Pierre Jaccard, Geophysical Institute, University of Bergen, 1999