mgd77header (1gmt)

mgd77header NGDC-id.a77 [ -Hheadervalues.txt ] [ -Mf|r ] [ -V ]

mgd77header 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 (-H) 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) (-M).

No space between the option flag and the associated arguments.

-H

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.

-M

Choose between MGD77 formatted header output f or list r.

-V

Selects verbose mode, which will send progress reports to stderr [Default runs "silently"].

Format_Acronym MGD77

Source_Institution SOEST - UNIV. OF HAWAII

Country USA

Platform_Name KILO MOANA

Platform_Type_Code 1

Platform_Type SHIP

Survey_Identifier

Format_Acronym

Data_Center_File_Number

Parameters_Surveyed_Code

File_Creation_Year

File_Creation_Month

File_Creation_Day

Source_Institution

Country

Platform_Name

Platform_Type_Code

Platform_Type

Chief_Scientist

Project_Cruise_Leg

Funding

Survey_Departure_Year

Survey_Departure_Month

Survey_Departure_Day

Port_of_Departure

Survey_Arrival_Year

Survey_Arrival_Month

Survey_Arrival_Day

Port_of_Arrival

Navigation_Instrumentation

Geodetic_Datum_Position_Determination_Method

Bathymetry_Instrumentation

Bathymetry_Add_Forms_of_Data

Magnetics_Instrumentation

Magnetics_Add_Forms_of_Data

Gravity_Instrumentation

Gravity_Add_Forms_of_Data

Seismic_Instrumentation

Seismic_Data_Formats

Format_Type

Format_Description

Topmost_Latitude

Bottommost_Latitude

Leftmost_Longitude

Rightmost_Longitude

Bathymetry_Digitizing_Rate

Bathymetry_Sampling_Rate

Bathymetry_Assumed_Sound_Velocity

Bathymetry_Datum_Code

Bathymetry_Interpolation_Scheme

Magnetics_Digitizing_Rate

Magnetics_Sampling_Rate

Magnetics_Sensor_Tow_Distance

Magnetics_Sensor_Depth

Magnetics_Sensor_Separation

Magnetics_Ref_Field_Code

Magnetics_Ref_Field

Magnetics_Method_Applying_Res_Field

Gravity_Digitizing_Rate

Gravity_Sampling_Rate

Gravity_Theoretical_Formula_Code

Gravity_Theoretical_Formula

Gravity_Reference_System_Code

Gravity_Reference_System

Gravity_Corrections_Applied

Gravity_Departure_Base_Station

Gravity_Departure_Base_Station_Name

Gravity_Arrival_Base_Station

Gravity_Arrival_Base_Station_Name

Number_of_Ten_Degree_Identifiers

Ten_Degree_Identifier

Additional_Documentation_1

Additional_Documentation_2

Additional_Documentation_3

Additional_Documentation_4

Additional_Documentation_5

Additional_Documentation_6

Additional_Documentation_7

To generate an MGD77 header from A77 input, try

mgd77header km0201 -H kmheaderitems.txt -Mf > km0201.h77

mgd77list(1), mgd77manage(1), mgd77path(1), mgd77track(1) x2sys_init(1)

Wessel, P., and W. H. F. Smith, 2014, The Generic Mapping Tools (GMT) version 4.5.12 Technical Reference & Cookbook, SOEST/NOAA.

Wessel, P., and W. H. F. Smith, 1998, New, Improved Version of Generic Mapping Tools Released, EOS Trans., AGU, 79 (47), p. 579.

Wessel, P., and W. H. F. Smith, 1995, New Version of the Generic Mapping Tools Released, EOS Trans., AGU, 76 (33), p. 329.

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.

Wessel, P., and W. H. F. Smith, 1991, Free Software Helps Map and Display Data, EOS Trans., AGU, 72 (41), p. 441.

The Marine Geophysical Data Exchange Format - "MGD77", see http://www.ngdc.noaa.gov/mgg/dat/geodas/docs/mgd77.txt