S04P (S04I and S04P) bathymetry:

Two cruises:

1. S03/S04I
ASCII navigation and bathymetry data files were obtained from 
Susan Wijffels via Jim Crease on 11/13/98. 

Updated 9/19/2003 L. Talley

Expedition designation (ExpoCode)  09AR9404_1
Chief scientist and affiliation  Steve Rintoul/CSIRO*
Ship  RSV Aurora Australis
Cruise dates  1994.DEC.13 to 1995.FEB.02
Ports of call  Casey

"S04I_bathy_original.zip" is the zipped original data file 
  au9404.dep (format specified below)

"S04I_bathy_edit.zip" is the edited original data file 
  au9404_s4i_edit.dep (format specified below)
  (only the portion of au9404 used for S4I; for complete
   file please look at cruise S03)

"S04I_bathy_gdc.dat" is the edited data in Geological Data Center
    format, including corrected depths at all recorded locations.

2. S04P
ASCII navigation and bathymetry data file was obtained from
SIO Geological Data Center (Uta Albright) 9/23/03

Line	S04P ,IOFFE6	Full Size
ExpoCode	90KDIOFFE6_1
Ship/Country	AKADEMIK IOFFE/ RUS
Chief Scientists	Koshlyakov/IORAN : Richman/OSU
Cruise Date	1992-02-14

"S04P_bathy_original.zip" is the zipped original data file 
  mgd77.IOFE01IF 
   In this orginal data file, times that have meters and not 2way travel time are
   not corrected ( unspecified correction )

"S04P_bathy_gdc.dat" is the edited data in Geological Data Center
    format, including corrected depths at all recorded locations.

3. Combined S04I and S04P cruises has a small gap between the
last and first stations. Bathymetry between them is interpolated 
from Smith and Sandwell

4. For the combined cruises (taken together called S04P):

"S04P_bathydist.dat" is the decimated bathymetry file, projected
    onto straight lines between station positions, used for plotting
    the vertical sections. 

"S04P_sta_bdep.dat" is the station list, with corrected bottom
    pressures for each station, based on the WHP sum file
    (station summary file)  

-----------------------------------------------
Format specifications

Ascii Navigation format for "file_bathy_gdc.dat"
latitude    (xxx.xxx)
longitude   (xxxx.xxx)
unc depth   (xxxxx.x) meters
corr depth  (xxxxx.x) meters
month       (ii)
day         (iii) day of the month
year        (ii) assuming 1900 century
hour        (ii)
minute      (ii)
second      (ii)
Julian date (xxxxxxx.xxxxx)

Format of "s03_bathydist.dat"
ist (iii) station number (set to 1)
dist (ffffff.f) distance (km) along section
lat (dddddd.mm) decimal latitude
lon (dddddd.mm) decimal longitude
dpt (ddddd.d) depth meters

Format of s03_sta_bdep.dat
station  (iiii) station number
distance (xxxxx.x) km along section
latitude (xxx.xxx)
longitude (xxxx.xxx)
pressure  (xxxx.x) dbar  OR  depth in meters

-------------------------------------------------------------
Original data format:
column  parameter
1       decimal time (0.0=midnight on December 31st)
2       day
3       month
4       year
5       hour
6       minute
7       second
8       latitude (decimal degrees,+ve=north, -ve=south)
9       longitude(decimal degrees,+ve=east, -ve=west)
10      depth (m), using a sound speed of 1498 m/s, and
        measured from the water surface

Data are instantaneous readings at each 10 second interval.
There is a line of data for each 10 second interval.
-999.0 = null value
All depth have been standardised to a sound speed of 1498 m/s

-------Notes on editing and decimation-----

au9404_edit.dep
  All lines with missing depths removed.  Bathymetry data  
  are clean although gappy.  Problem with navigation apparent
  but retained for region between stations 74 and 79

S03_bathy_gdc.dat
  portion of au9404_edit.dep appropriate for S03 selected.
  Data decimated to every 6th point, or approximately 1/minute
   (except that there were many data gaps removed initially)
  All ship speeds less than 2 knots and greater than 30 knots removed
   (to remove all data from station locations)

S03_bathy_gdc_clean.dat
  S03_bathy_gdc.dat with loop at stations 86-88 removed, and all
  backtracks in latitude removed.