/*--------------------------------------------------------------------
 *    The MB-system:	mbf_em12darw.h	1/20/93
 *	$Id: mbf_em12darw.h 1917 2012-01-10 19:25:33Z caress $
 *
 *    Copyright (c) 1994-2012 by
 *    David W. Caress (caress@mbari.org)
 *      Monterey Bay Aquarium Research Institute
 *      Moss Landing, CA 95039
 *    and Dale N. Chayes (dale@ldeo.columbia.edu)
 *      Lamont-Doherty Earth Observatory
 *      Palisades, NY 10964
 *
 *    See README file for copying and redistribution conditions.
 *--------------------------------------------------------------------*/
/*
 * mbf_em12darw.h defines the data structure used by MBIO functions
 * to store multibeam data read from the  MBF_EM12DARW format (MBIO id 51).  
 *
 * Authors:	D. W. Caress (L-DEO)
 *		R. B. Owens (University of Oxford)
 * Date:	January 20, 1994
 * $Log: mbf_em12darw.h,v $
 * Revision 5.3  2003/12/04 23:10:22  caress
 * Fixed problems with format 54 EM12DARW due to old code assuming how internal structure was packed. Also changed handling of beamflags for formats that don't support beamflags. Now flagged beams will always be nulled in such cases.
 *
 * Revision 5.2  2003/04/17 21:05:23  caress
 * Release 5.0.beta30
 *
 * Revision 5.1  2002/09/18 23:32:59  caress
 * Release 5.0.beta23
 *
 * Revision 5.0  2000/12/01 22:48:41  caress
 * First cut at Version 5.0.
 *
 * Revision 4.3  2000/09/30  06:29:44  caress
 * Snapshot for Dale.
 *
 * Revision 4.2  1998/10/05  18:32:27  caress
 * MB-System version 4.6beta
 *
 * Revision 4.1  1997/04/21  17:02:07  caress
 * MB-System 4.5 Beta Release.
 *
 * Revision 4.1  1997/04/21  17:02:07  caress
 * MB-System 4.5 Beta Release.
 *
 * Revision 4.0  1994/10/21  12:35:05  caress
 * Release V4.0
 *
 * Revision 4.0  1994/10/21  12:35:05  caress
 * Release V4.0
 *
 * Revision 1.1  1994/10/21  12:20:01  caress
 * Initial revision
 *
 * Revision 4.0  1994/03/06  00:01:56  caress
 * First cut at version 4.0
 *
 * Revision 4.0  1994/03/05  22:54:09  caress
 * First cut.
 *
 *
 */
/*
 * Notes on the MBF_EM12DARW data format:
 *   1. This data format is used to store 81 beam SIMRAD EM12 bathymetry
 *      data.  This format was created and used by R.B.Owens for
 *      SIMRAD EM12 data collected on the RRS Charles Darwin;
 *   2. The data consist of 1056-byte records including 1-byte characters,
 *      2-byte and 4-byte integers, 4-byte floats and 8-byte doubles.
 *   3. The 81 depth values are stored centered in 81 value arrays.  The
 *      center beam is in word 40 of the depth and distance arrays.
 *   4. The "range" is the two-way pulse travel time for each beam (81 values)
 *   5. The "reflectivity" is the mean backscattering strength (in dB) 
 *      over each beam, corrected for beam patterns, echo sounder 
 *      parameters and Lambert's law.  In the context of MB-System, the 
 *	backscatter values are considered to be amplitudes rather than 
 *	sidescan because they are coincident with the bathymetry values.
 *   6. Comments can be embedded in the data as N-byte ascii strings,
 *	where "func" = 100. Comment lines are stored as 1-byte characters
 *      in the "depth" array. For data, "func" = 150.
 *   7. Mode; 1 = Shallow, 2 = Deep. Controls scaling factors, e.g. Depth is 
 *      scaled 1/0.1 for mode 1 and scaled 1/0.2 for mode 2.
 *
 */

/* record length in bytes */
#define MBF_EM12DARW_RECORD_LENGTH 1056

/* number of beams for EM12 */
#define MBF_EM12DARW_BEAMS 81

struct mbf_em12darw_struct {
	short	func;		/* record type; 100=comment, 150=data */
	short	year;		/* TWO-digit year */
	short 	jday;		/* Julian day  */
	short 	minute;		/* minute of day */
	short	secs;		/* seconds x 100 */
	double	latitude;	/* latitude (for units see corflag) */
	double	longitude;	/* longitude (for units see corflag) */
	short	corflag;	/* Co-ordinate flag: 0=Lat/Long, 1=UTM North,
					2=UTM South  */
	float	utm_merd;	/* UTM Meridian if corflag=1,2  */
	short	utm_zone;	/* UTM Zone if corflag=1,2  */
	short	posq;		/* Quality factor of Position data */
	int	pingno;		/* ping number */
	short	mode;		/* resolution mode */
	float	depthl;		/* depth of centrebeam */
	float	speed;		/* Ship's speed */
	float	gyro;		/* Ship's Heading */
	float	roll;		/* Ship's Roll */
	float	pitch;		/* Ship's Pitch */
	float	heave;		/* Ship's Heave */
	float	sndval;		/* Sound Velocity */
	short	depth[MBF_EM12DARW_BEAMS];	
				/* Beam Depth scaled (0.1/0.2) */
	short	distacr[MBF_EM12DARW_BEAMS];	
				/* Beam Across Distance, scaled (0.2/0.5) */
	short	distalo[MBF_EM12DARW_BEAMS];	
				/* Beam Along Distance, scaled (0.2/0.5) */
	short	range[MBF_EM12DARW_BEAMS];	
				/* Beam Range, scaled (0.2/0.8) */
	short	refl[MBF_EM12DARW_BEAMS];	
				/* Beam Reflectivity, scaled 0.5 */
	short	beamq[MBF_EM12DARW_BEAMS];	
				/* Beam Quality, unscaled */
};