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<h1 align="center">MGD77HEADER</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#OPTIONS">OPTIONS</a><br>
<a href="#Header Item Sample File:">Header Item Sample File:</a><br>
<a href="#Names of All MGD77 Header Fields">Names of All MGD77 Header Fields</a><br>
<a href="#EXAMPLES">EXAMPLES</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<a href="#REFERENCES">REFERENCES</a><br>
<hr>
<h2>NAME
<a name="NAME"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">mgd77header
− Generate MGD77 header from data records</p>
<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>mgd77header</b>
<i>NGDC-id.a77</i> [ <b>−Hheadervalues.txt</b> ] [
<b>−Mf</b>|<b>r</b> ] [ <b>−V</b> ]</p>
<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>mgd77header</b>
generates an MGD77 header by reading A77 data (i.e., the
data record portion of MGD77 files), determines temporal and
spatial extents, ten degree boxes crossed, and data columns
present. Optionally, it can also read an input file
consisting of header field values (<b>−H</b>) to be
included in program output. Header field values determined
from data and read from input are output in either MGD77
format (f) or as a list (r) (<b>−M</b>).</p>
<h2>OPTIONS
<a name="OPTIONS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">No space
between the option flag and the associated arguments.</p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−H</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Obtain header field values from an input text file. Each
row of the input file should consist of a header field name
and its desired value, separated by a space. See below for a
sample header file and for the full list of header field
names.</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−M</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Choose between MGD77 formatted header output <b>f</b> or
list <b>r</b>.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−V</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Selects verbose mode, which will send progress reports
to stderr [Default runs "silently"].</p></td></tr>
</table>
<h2>Header Item Sample File:
<a name="Header Item Sample File:"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">Format_Acronym
MGD77 <br>
Source_Institution SOEST - UNIV. OF HAWAII <br>
Country USA <br>
Platform_Name KILO MOANA <br>
Platform_Type_Code 1 <br>
Platform_Type SHIP</p>
<h2>Names of All MGD77 Header Fields
<a name="Names of All MGD77 Header Fields"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">Survey_Identifier
<br>
Format_Acronym <br>
Data_Center_File_Number <br>
Parameters_Surveyed_Code <br>
File_Creation_Year <br>
File_Creation_Month <br>
File_Creation_Day <br>
Source_Institution <br>
Country <br>
Platform_Name <br>
Platform_Type_Code <br>
Platform_Type <br>
Chief_Scientist <br>
Project_Cruise_Leg <br>
Funding <br>
Survey_Departure_Year <br>
Survey_Departure_Month <br>
Survey_Departure_Day <br>
Port_of_Departure <br>
Survey_Arrival_Year <br>
Survey_Arrival_Month <br>
Survey_Arrival_Day <br>
Port_of_Arrival <br>
Navigation_Instrumentation <br>
Geodetic_Datum_Position_Determination_Method <br>
Bathymetry_Instrumentation <br>
Bathymetry_Add_Forms_of_Data <br>
Magnetics_Instrumentation <br>
Magnetics_Add_Forms_of_Data <br>
Gravity_Instrumentation <br>
Gravity_Add_Forms_of_Data <br>
Seismic_Instrumentation <br>
Seismic_Data_Formats <br>
Format_Type <br>
Format_Description <br>
Topmost_Latitude <br>
Bottommost_Latitude <br>
Leftmost_Longitude <br>
Rightmost_Longitude <br>
Bathymetry_Digitizing_Rate <br>
Bathymetry_Sampling_Rate <br>
Bathymetry_Assumed_Sound_Velocity <br>
Bathymetry_Datum_Code <br>
Bathymetry_Interpolation_Scheme <br>
Magnetics_Digitizing_Rate <br>
Magnetics_Sampling_Rate <br>
Magnetics_Sensor_Tow_Distance <br>
Magnetics_Sensor_Depth <br>
Magnetics_Sensor_Separation <br>
Magnetics_Ref_Field_Code <br>
Magnetics_Ref_Field <br>
Magnetics_Method_Applying_Res_Field <br>
Gravity_Digitizing_Rate <br>
Gravity_Sampling_Rate <br>
Gravity_Theoretical_Formula_Code <br>
Gravity_Theoretical_Formula <br>
Gravity_Reference_System_Code <br>
Gravity_Reference_System <br>
Gravity_Corrections_Applied <br>
Gravity_Departure_Base_Station <br>
Gravity_Departure_Base_Station_Name <br>
Gravity_Arrival_Base_Station <br>
Gravity_Arrival_Base_Station_Name <br>
Number_of_Ten_Degree_Identifiers <br>
Ten_Degree_Identifier <br>
Additional_Documentation_1 <br>
Additional_Documentation_2 <br>
Additional_Documentation_3 <br>
Additional_Documentation_4 <br>
Additional_Documentation_5 <br>
Additional_Documentation_6 <br>
Additional_Documentation_7</p>
<h2>EXAMPLES
<a name="EXAMPLES"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">To generate an
MGD77 header from A77 input, try</p>
<p style="margin-left:11%; margin-top: 1em"><b>mgd77header</b>
km0201 <b>−H</b> kmheaderitems.txt -Mf >
km0201.h77</p>
<h2>SEE ALSO
<a name="SEE ALSO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><i><A HREF="mgd77list.html">mgd77list</A></i>(1),
<i><A HREF="mgd77manage.html">mgd77manage</A></i>(1), <i><A HREF="mgd77path.html">mgd77path</A></i>(1),
<i><A HREF="mgd77track.html">mgd77track</A></i>(1) <i><A HREF="x2sys_init.html">x2sys_init</A></i>(1)</p>
<h2>REFERENCES
<a name="REFERENCES"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">Wessel, P., and
W. H. F. Smith, 2014, The Generic Mapping Tools (GMT)
version 4.5.12 Technical Reference & Cookbook,
SOEST/NOAA. <br>
Wessel, P., and W. H. F. Smith, 1998, New, Improved Version
of Generic Mapping Tools Released, EOS Trans., AGU, 79 (47),
p. 579. <br>
Wessel, P., and W. H. F. Smith, 1995, New Version of the
Generic Mapping Tools Released, EOS Trans., AGU, 76 (33), p.
329. <br>
Wessel, P., and W. H. F. Smith, 1995, New Version of the
Generic Mapping Tools Released,
http://www.agu.org/eos_elec/95154e.html, Copyright 1995 by
the American Geophysical Union. <br>
Wessel, P., and W. H. F. Smith, 1991, Free Software Helps
Map and Display Data, EOS Trans., AGU, 72 (41), p. 441. <br>
The Marine Geophysical Data Exchange Format -
"MGD77", see
<i>http://www.ngdc.noaa.gov/mgg/dat/geodas/docs/mgd77.txt</i></p>
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