mbm_makesvp(1)

NAME
mbm_makesvp - Macro to extract sound speed and depth data from a datalist of swath files, and generate a sound velocity profile model from averages of the sound speed values in regular depth ranges.

VERSION
Version 5.0

SYNOPSIS
mbm_makesvp -Iinputfile [-H -V -Ddepthinterval -Ooutputfile]

DESCRIPTION
mbm_makesvp is a macro to extract sound speed and depth data from a datalist of swath files, and generate a sound velocity profile model from averages of the sound speed values in regular depth ranges. This macro uses mbctdlist to extract the sound speed values embedded in swath data files. This macro is intended for use with mapping data from submerged platforms (e.g. ROVs and AUVs) carrying CTD or sound speed sensors. Since the sound speed values are generally recorded during the entire ROV or AUV survey, these values can be used to construct a model for sound speed as a function of depth at the survey location. The sound speed and sonar depth value pairs are binned according to the depthinterval value, and average sound speed values are reported for bins with at least one value. The -O option specifies the output filename; by default the model is output to the stdout stream.

AUTHORSHIP
David W. Caress (caress@mbari.org)
  Monterey Bay Aquarium Research Institute
Dale N. Chayes (dale@ldeo.columbia.edu)
  Lamont-Doherty Earth Observatory

OPTIONS

-D  depthinterval
    Sets the size in meters of the depth bins used to calculate an average sound speed versus depth model. The default value is 25 meters.

-F  format
    Sets the data format for the input data. If format < 0, then the input file specified with the -I option will actually contain a list of input swath sonar data files. This program uses the MBIO library and will read or write any swath sonar format supported by MBIO. A list of the swath sonar data formats currently supported by MBIO and their identifier values is given in the MBIO manual page. Default: format = -1.

-H  This "help" flag cause the program to print out a description of its operation and then exit immediately.

-I  inputfile
    Sets the input filename. If format > 0 (set with the -f option) then the swath sonar data contained in infile is read and processed. If format < 0 (the default), then infile is assumed to be an ascii file containing a list of the input swath sonar data files to be processed and their formats. The program will read the data in each one of these files. In the inputfile file, each data file should be followed by a data format identifier, e.g.:
         datafile1 11
         datafile2 24
    This program uses the MBIO library and will read any swath sonar format supported by MBIO. However, not all formats contain sound speed or CTD information, and useful results can only be expected from data actually including the relevant values. A list of the swath sonar data formats currently supported by MBIO and their identifier values is given in the MBIO manual page. The default input filename is "datalist.mb-1".

-O  output
    Sets the name of the output file for the sound speed versus depth model. By default, the model is output to the stdout stream.

-V  The -V option causes mbm_makesvp to print out status messages.

EXAMPLES
Suppose we have a set of swath files from an AUV-based survey in a directory and we want to construct an average sound speed versus depth model from these data. The command:
    mbm_makesvp -Idatalist.mb-1 -D25 -Osvp.txt -V will generate a model of sound speed versus depth in the output file "svp.txt".

SEE ALSO
mbsystem(1), mbctdlist(1)

BUGS
Likely yes.