ABOUT_IBCAO is the jdata module of jLab.

 ABOUT_IBCAO  International Bathymetric Chart of the Arctic Ocean topography.
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    IBCAO.MAT is a matfile containing Artic topography data at a resolution
    of 30 arc second, or 1/120 of a degree, from the International 
    Bathymetric Chart of the Arctic Ocean (IBCAO) Version 3.0.
 
    LOAD IBCAO loads the structure IBCAO, with the following fields:
 
        ibcao.about     Pointer to this document  
        ibcao.lat       Array of latitudes         [3121 x 1] 
        ibcao.lon       Array of longitudes        [1 x 43201]
        ibcao.topo      Matrix of topography       [3121 x 43201]
 
    Typing 'use ibcao' maps these fields into variables in the current
    workspace.
 
    TOPO is in units of kilometers and is positive for above sea level, 
    and negative for below sea level.
 
    IBCAO.MAT is distributed with JLAB at http://www.jmlilly.net.
 
    Topography at lower latitudes can be found from the Smith and Sandwell
    dataset, see READTOPO.  A merged 1/6th degree version of both datasets,
    called JTOPO, is is distributed with JLAB; see ABOUT_JTOPO for details.
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    Data and documentation
 
    This dataset is simply a mat-file version of the IBCAO file 
    'IBCAO_V3_30arcsec_RR.grd', available from
 
       http://www.ngdc.noaa.gov/mgg/bathymetry/arctic/grids/version3_0/
 
    The reference for this dataset is
 
       Jakobsson, M., L. A. Mayer, B. Coakley, J. A. Dowdeswell, S. Forbes,
           B. Fridman, H. Hodnesdal, R. Noormets, R. Pedersen, M. Rebesco,
           H.-W. Schenke, Y. Zarayskaya A, D. Accettella, A. Armstrong, 
           R. M. Anderson, P. Bienhoff, A. Camerlenghi, I. Church, 
           M. Edwards, J. V. Gardner, J. K. Hall, B. Hell, O. B. Hestvik, 
           Y. Kristoffersen, C. Marcussen, R. Mohammad, D. Mosher, 
           S. V. Nghiem, M. T. Pedrosa, P. G. Travaglini, and 
           P. Weatherall, The International Bathymetric Chart of the Arctic
           Ocean (IBCAO) Version 3.0, Geophysical Research Letters, 
           doi: 10.1029/2012GL052219
 
    No copyright or policy is specified in the IBCAO documentation. 
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    Dataset creation
 
    For completeness, the m-file ABOUT_IBCAO also contains steps used in 
    the creation of IBCAO.MAT. If you wish to do this yourself, with both 
    JLAB and IBCAO_V3_30arcsec_RR.grd on your search path, typing
    'about_ibcao --create' will recreate IBCAO.MAT.
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    See also READTOPO, TOPOPLOT, JDATA, ABOUT_JDATA.
 
    'about_ibcao --f' generates the sample figure shown above.
 
    Usage: about_ibcao
           about_ibcao --create
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    This is part of JLAB --- type 'help jlab' for more information
    (C) 2015 J.M. Lilly --- type 'help jlab_license' for details

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