This is a subset of the data acquired 4th March 1994 at the Strait of Sicily, during the 
MAST2 Project Contract: MAS2-CT920022
"Geophysical seafloor exploration with a towed array in shallow water" 

The publication "Geoacoustic Seafloor Exploration with a Towed Array in a
Shallow Water Area of the Strait of Sicily", Andrea Caiti, Sergio Jesus,
Age Kristensen, IEEE J. Oceanic Engineering, Vol. 21, No.4,pp. 355-366,1996
describes the experimental setup of this data set (see http://w3.ualg.pt/~sjesus)

1) Acoustic data
  The data was acquired from a 40 hydrophone towed array at sampling frequency
  of 750Hz.
  Each 5 minutes run was split into 5 mat files 
  run108	files acdata/run108_1m.mat	1st min.
		            /run108_2m.mat	2nd min.
			    /run108_3m.mat	3rd min.
			    /run108_4m.mat	4th min.
        		    /run108_5m.mat	5th min.		 
 
  run109, run110, run207, run208, run209 as the same file structure 
  
  The variables in the acoustic data mat-files are:
	HourSt   - hour of first sample in the file
  	MinSt    - minute of first sample in the file
  	SecSt    - second of first sample in the file    
  	fSamp    - sampling frequency (750HZ)    
  	nChan    - number of hydrophones (40)          
  	sig      - signal matrix 
		   sig(i,:) signal from i-th hydrophone 


  
2) Array shape data
   The array shapes estimates - one sample per second.
   The mat files are in the directory pos. Each acoustic data file (see before) has a correspondent array shape file. 

	Acoustic data mat-file			Array shape data mat-file
acdata/run108_1m.mat			pos/run108_1p.mat
	/run108_2m.mat			    /run108_2p.mat

and so on.
			 
   The variables in the array shape mat-files are:
		hms	- time stamp of the first sample in the file
				h(1) hour; h(2) minute; h(3) second
            pX	- x-axe array shape estimates 
			  pX(i,j) x estimate of the j-th hydrophone (j-1) seconds from the start.	 
 	      pY	- y-axe array shape estimates 
			  pY(i,j) y estimate of the j-th hydrophone (j-1) seconds from the start.	 
pZ	- z-axe array shape estimates 
			  pX(i,j) z estimate of the j-th hydrophone (j-1) seconds from the start.	 

  

3) Navigation data
   A plot with the ship track during the experiment and a plot with the water depth along the track are included in the directory ims
   
   The ship track plot is genereted by the shiptr2.m m-file using the shiptr2.mat mat file.

   The water depth plot is genereted by the waterdp.m m-file using the waterdp.mat mat file 

4) Sound speed profile
   A plot with the sound speed profile acquired at 8:27 am is included in the ssp directory.
   
   The sound speed profile is genereted by the ssp.m m-file using the ssp.mat mat file.