Provided by: gmt-common_5.4.3+dfsg-1_all 
NAME
mgd77info - Extract information about MGD77 files
SYNOPSIS
mgd77info NGDC-ids [ -C[m|e] ] [ -E[m|e] ] [ -Iignore ] [ -Mf[item]|r|e|h ] [ -L[v] ] [ -V[level] ]
Note: No space is allowed between the option flag and the associated arguments.
DESCRIPTION
mgd77info reads <legid>.[mgd77|nc] files and produces a single record of information about each cruise
specified. The information includes beginning and end times, total track distances in km, longitude and
latitude range, and the total number of geophysical observations. Optionally, choose instead to see the
original MGD77 header meta-data section or its individual members.
If you need to know which tracks are crossing through a given region and what kinds of geophysical
observations are available, consider using the x2sys tools to set up a tracks index data base (see
x2sys_init for more information).
REQUIRED ARGUMENTS
NGDC-ids
Can be one or more of five kinds of specifiers:
1. 8-character NGDC IDs, e.g., 01010083, JA010010etc., etc.
2. 2-character agency codes which will return all cruises from each agency.
3. 4-character <agency><vessel> codes, which will return all cruises from those vessels.
4. =list, where list is a table with NGDC IDs, one per line.
5. If nothing is specified we return all cruises in the data base.
(See mgd77info -L for agency and vessel codes). If no file extension is given then we search for
files with one of the four known extensions. The search order (and the extensions) tried is
MGD77+ (“.nc”), MGD77T (“.m77t”), MGD77 (“.mgd77” ) and plain text file (“.dat”). Use -I to
ignore one or more of these file types). Cruise files will be looked for first in the current
directory and second in all directories listed in $MGD77_HOME/mgd77_paths.txt [If $MGD77_HOME is
not set it will default to $GMT_SHAREDIR/mgd77].
OPTIONAL ARGUMENTS
-C[m|e]
List abbreviations for all columns present in the MGD77[+] files. Append m or e to limit the
display to the MGD77 standard or MGD77+ extended set only.
-E[m|e]
Give a one-line summary for each cruise listed.
-Mf[item]|r|e|h
List the meta-data (header) and (if present) the MGD77+ history for each cruise. Append f for a
formatted display. This will list individual parameters and their values, one entry per output
line, in a format that can be searched using standard UNIX text tools. Alternatively, append the
name of a particular parameter (you only need to give enough characters - starting at the
beginning - to uniquely identify the item). Give - to display the list of all parameter names. You
may also specify the number of a parameter. For the raw, punchcard-formatted MGD77 original header
block, append r instead. For the MGD77+ E77 status, append e instead. Finally, for the MGD77+
history, append h instead.
-Iignore
Ignore certain data file formats from consideration. Append a|c|m|t to ignore MGD77 ASCII, MGD77+
netCDF, MGD77T ASCII or plain tab-separated ASCII table files, respectively. The option may be
repeated to ignore more than one format. [Default ignores none].
-L[v] No cruise information is listed. Instead, we just display a list of the GEODAS institution
2-character codes and their names. Optionally, append v to also display the vessels and their
4-character codes for each institution. The following is the list of institutions: (01) LAMONT
(LDEO), (02) WOODS HOLE O.I., (03) NOAA, (04) US ARMY, (05) NEW ZEALAND, (06) US GEOL. SURVEY,
(07) OREGON ST. UNIV, (08) U.HAWAII SOEST, (09) US NAVY, (10) UNIV OF TEXAS, (11) RICE UNIV., (12)
CANADA, (13) UNIV OF CONN., (14) U.MIAMI (RSMAS), (15) SCRIPPS INST.OC, (16) CHINA, (17) U RHODE
ISLAND, (18) DUKE UNIVERSITY, (19) UNITED KINGDOM, (20) U.WASHINGTON, (22) WESTERN GEOPHY., (23)
TEXAS A&M UNIV., (24) AUSTRALIA, (25) MONACO, (29) RUSSIA, (30) SPAIN, (35) NIMA, (58)
NETHERLANDS, (60) MIN MGMT SVC, (63) ISRAEL, (67) FRANCE, (71) SOUTH AFRICA, (75) US COAST GUARD,
(76) BRAZIL, (77) INT. GRAV. BUR, (83) GERMANY, (84) ORSTOM NEW CAL, (86) CUBA, (87) ARGENTINA,
(88) US NSF, (89) INDIA, (90) PORTUGAL, (92) FINLAND, (93) CHILE, (J1) HYDR DEPT JAPAN, (J2) GEOL
SRVY JAPAN, (J4) UNIV TOKYO, (J5) KOBE UNIV, (J7) UNIV OF RYUKYUS, (J8) J.O.D.C. JAPAN, (J9) CHIBA
UNIV, (JA) INST.POLAR RES., (ZZ) INST NOT CODED.
-V[level] (more …)
Select verbosity level [c].
-^ or just -
Print a short message about the syntax of the command, then exits (NOTE: on Windows just use -).
-+ or just +
Print an extensive usage (help) message, including the explanation of any module-specific option
(but not the GMT common options), then exits.
-? or no arguments
Print a complete usage (help) message, including the explanation of all options, then exits.
EXAMPLES
To get one-line summary information about the cruises 01010047.mgd77 and 01010008.mgd77, try
gmt mgd77info 01010047 01010008 -E > listing.lis
To see the original raw MGD77 header meta-data for cruise 01010047.mgd77, run
gmt mgd77info 01010047 -Mr
To determine all the parameters related to Gravity during cruise 01010047.mgd77, run
gmt mgd77info 01010047 -Mf | grep Gravity
To determine the Magnetic sampling rate used during cruise 01010047.mgd77, run
gmt mgd77info 01010047 -MfMagnetics_Sampling_Rate
To see all the columns that the MGD77+ cruise 01010047.nc contains, run
gmt mgd77info 01010047 -C
To see the E77 status of all MGD77+ cruises collected by the University of Hawaii (institution 08), run
gmt mgd77info 08 -Ia -Me
SEE ALSO
mgd77list, mgd77manage, mgd77path, mgd77track, x2sys_init
REFERENCES
The Marine Geophysical Data Exchange Format - MGD77, see
http://www.ngdc.noaa.gov/mgg/dat/geodas/docs/mgd77.txt.
COPYRIGHT
2018, P. Wessel, W. H. F. Smith, R. Scharroo, J. Luis, and F. Wobbe