Provided by: geographiclib-tools_2.3-1_amd64 
NAME
GeoConvert -- convert geographic coordinates
SYNOPSIS
GeoConvert [ -g | -d | -: | -u | -m | -c ] [ -z zone | -s | -t | -S | -T ] [ -n ] [ -w ] [
-p prec ] [ -l | -a ] [ --comment-delimiter commentdelim ] [ --version | -h | --help ] [
--input-file infile | --input-string instring ] [ --line-separator linesep ] [
--output-file outfile ]
DESCRIPTION
GeoConvert reads from standard input interpreting each line as a geographic coordinate and
prints the coordinate in the format specified by the options on standard output. The
input is interpreted in one of three different ways depending on how many space or comma
delimited tokens there are on the line. The options -g, -d, -u, and -m govern the format
of output. In all cases, the WGS84 model of the earth is used (a = 6378137 m, f =
1/298.257223563).
geographic
2 tokens (output options -g, -d, or -:) given as latitude longitude using decimal
degrees or degrees, minutes, and seconds. Latitude is given first (unless the -w
option is given). See "GEOGRAPHIC COORDINATES" for a description of the format. For
example, the following are all equivalent
33.3 44.4
E44.4 N33.3
33d18'N 44d24'E
44d24 33d18N
33:18 +44:24
UTM/UPS
3 tokens (output option -u) given as zone+hemisphere easting northing or easting
northing zone+hemisphere, where hemisphere is either n (or north) or s (or south).
The zone is absent for a UPS specification. For example,
38n 444140.54 3684706.36
444140.54 3684706.36 38n
s 2173854.98 2985980.58
2173854.98 2985980.58 s
MRGS
1 token (output option -m) is used to specify the center of an MGRS grid square. For
example,
38SMB4484
38SMB44140847064
OPTIONS
-g output latitude and longitude using decimal degrees. Default output mode.
-d output latitude and longitude using degrees, minutes, and seconds (DMS).
-: like -d, except use : as a separator instead of the d, ', and " delimiters.
-u output UTM or UPS.
-m output MGRS.
-c output meridian convergence and scale for the corresponding UTM or UPS projection.
The meridian convergence is the bearing of grid north given as degrees clockwise from
true north.
-z zone
set the zone to zone for output. Use either 0 < zone <= 60 for a UTM zone or zone = 0
for UPS. Alternatively use a zone+hemisphere designation, e.g., 38n. See "ZONE".
-s use the standard UPS and UTM zones.
-t similar to -s but forces UPS regions to the closest UTM zone.
-S or -T
behave the same as -s and -t, respectively, until the first legal conversion is
performed. For subsequent points, the zone and hemisphere of that conversion are
used. This enables a sequence of points to be converted into UTM or UPS using a
consistent coordinate system.
-n on input, MGRS coordinates refer to the south-west corner of the MGRS square instead
of the center; see "MGRS".
-w toggle the longitude first flag (it starts off); if the flag is on, then on input and
output, longitude precedes latitude (except that, on input, this can be overridden by
a hemisphere designator, N, S, E, W).
-p prec
set the output precision to prec (default 0); prec is the precision relative to 1 m.
See "PRECISION".
-l on output, UTM/UPS uses the long forms north and south to designate the hemisphere
instead of n or s.
-a on output, UTM/UPS uses the abbreviations n and s to designate the hemisphere instead
of north or south; this is the default representation.
--comment-delimiter commentdelim
set the comment delimiter to commentdelim (e.g., "#" or "//"). If set, the input
lines will be scanned for this delimiter and, if found, the delimiter and the rest of
the line will be removed prior to processing and subsequently appended to the output
line (separated by a space).
--version
print version and exit.
-h print usage and exit.
--help
print full documentation and exit.
--input-file infile
read input from the file infile instead of from standard input; a file name of "-"
stands for standard input.
--input-string instring
read input from the string instring instead of from standard input. All occurrences
of the line separator character (default is a semicolon) in instring are converted to
newlines before the reading begins.
--line-separator linesep
set the line separator character to linesep. By default this is a semicolon.
--output-file outfile
write output to the file outfile instead of to standard output; a file name of "-"
stands for standard output.
PRECISION
prec gives precision of the output with prec = 0 giving 1 m precision, prec = 3 giving 1
mm precision, etc. prec is the number of digits after the decimal point for UTM/UPS. For
MGRS, The number of digits per coordinate is 5 + prec; prec = -6 results in just the grid
zone. For decimal degrees, the number of digits after the decimal point is 5 + prec. For
DMS (degree, minute, seconds) output, the number of digits after the decimal point in the
seconds components is 1 + prec; if this is negative then use minutes (prec = -2 or -3) or
degrees (prec <= -4) as the least significant component. Print convergence, resp. scale,
with 5 + prec, resp. 7 + prec, digits after the decimal point. The minimum value of prec
is -5 (-6 for MGRS) and the maximum is 9 for UTM/UPS, 9 for decimal degrees, 10 for DMS, 6
for MGRS, and 8 for convergence and scale.
GEOGRAPHIC COORDINATES
The utility accepts geographic coordinates, latitude and longitude, in a number of common
formats. Latitude precedes longitude, unless the -w option is given which switches this
convention. On input, either coordinate may be given first by appending or prepending N
or S to the latitude and E or W to the longitude. These hemisphere designators carry an
implied sign, positive for N and E and negative for S and W. This sign multiplies any +/-
sign prefixing the coordinate. The coordinates may be given as decimal degree or as
degrees, minutes, and seconds. d, ', and " are used to denote degrees, minutes, and
seconds, with the least significant designator optional. (See "QUOTING" for how to quote
the characters ' and " when entering coordinates on the command line.) Alternatively, :
(colon) may be used to separate the various components. Only the final component of
coordinate can include a decimal point, and the minutes and seconds components must be
less than 60.
It is also possible to carry out addition or subtraction operations in geographic
coordinates. If the coordinate includes interior signs (i.e., not at the beginning or
immediately after an initial hemisphere designator), then the coordinate is split before
such signs; the pieces are parsed separately and the results summed. For example the
point 15" east of 39N 70W is
39N 70W+0:0:15E
WARNING: "Exponential" notation is not recognized for geographic coordinates. Thus 7.0E1
is illegal, while 7.0E+1 is parsed as (7.0E) + (+1), yielding the same result as 8.0E.
Various unicode characters (encoded with UTF-8) may also be used to denote degrees,
minutes, and seconds, e.g., the degree, prime, and double prime symbols; in addition two
single quotes can be used to represent ".
The other GeographicLib utilities use the same rules for interpreting geographic
coordinates; in addition, azimuths and arc lengths are interpreted the same way.
QUOTING
Unfortunately the characters ' and " have special meanings in many shells and have to be
entered with care. However note (1) that the trailing designator is optional and that (2)
you can use colons as a separator character. Thus 10d20' can be entered as 10d20 or 10:20
and 10d20'30" can be entered as 10:20:30.
Unix shells (sh, bash, tsch)
The characters ' and " can be quoted by preceding them with a \ (backslash); or you
can quote a string containing ' with a pair of "s. The two alternatives are
illustrated by
echo 10d20\'30\" "20d30'40" | GeoConvert -d -p -1
=> 10d20'30"N 020d30'40"E
Quoting of command line arguments is similar
GeoConvert -d -p -1 --input-string "10d20'30\" 20d30'40"
=> 10d20'30"N 020d30'40"E
Windows command shell (cmd)
The ' character needs no quoting; the " character can either be quoted by a ^ or can
be represented by typing ' twice. (This quoting is usually unnecessary because the
trailing designator can be omitted.) Thus
echo 10d20'30'' 20d30'40 | GeoConvert -d -p -1
=> 10d20'30"N 020d30'40"E
Use \ to quote the " character in a command line argument
GeoConvert -d -p -1 --input-string "10d20'30\" 20d30'40"
=> 10d20'30"N 020d30'40"E
Input from a file
No quoting need be done if the input from a file. Thus each line of the file
"input.txt" should just contain the plain coordinates.
GeoConvert -d -p -1 < input.txt
MGRS
MGRS coordinates represent a square patch of the earth, thus "38SMB4488" is in zone "38n"
with 444km <= easting < 445km and 3688km <= northing < 3689km. Consistent with this
representation, coordinates are truncated (instead of rounded) to the requested precision.
When an MGRS coordinate is provided as input, GeoConvert treats this as a representative
point within the square. By default, this representative point is the center of the
square ("38n 444500 3688500" in the example above). (This leads to a stable conversion
between MGRS and geographic coordinates.) However, if the -n option is given then the
south-west corner of the square is returned instead (38n 444000 3688000 in the example
above).
ZONE
If the input is geographic, GeoConvert uses the standard rules of selecting UTM vs UPS and
for assigning the UTM zone (with the Norway and Svalbard exceptions). If the input is
UTM/UPS or MGRS, then the choice between UTM and UPS and the UTM zone mirrors the input.
The -z zone, -s, and -t options allow these rules to be overridden with zone = 0 being
used to indicate UPS. For example, the point
79.9S 6.1E
corresponds to possible MGRS coordinates
32CMS4324728161 (standard UTM zone = 32)
31CEM6066227959 (neighboring UTM zone = 31)
BBZ1945517770 (neighboring UPS zone)
then
echo 79.9S 6.1E | GeoConvert -p -3 -m => 32CMS4328
echo 31CEM6066227959 | GeoConvert -p -3 -m => 31CEM6027
echo 31CEM6066227959 | GeoConvert -p -3 -m -s => 32CMS4328
echo 31CEM6066227959 | GeoConvert -p -3 -m -z 0 => BBZ1917
Is zone is specified with a hemisphere, then this is honored when printing UTM
coordinates:
echo -1 3 | GeoConvert -u => 31s 500000 9889470
echo -1 3 | GeoConvert -u -z 31 => 31s 500000 9889470
echo -1 3 | GeoConvert -u -z 31s => 31s 500000 9889470
echo -1 3 | GeoConvert -u -z 31n => 31n 500000 -110530
NOTE: the letter in the zone specification for UTM is a hemisphere designator n or s and
not an MGRS latitude band letter. Convert the MGRS latitude band letter to a hemisphere
as follows: replace C thru M by s (or south); replace N thru X by n (or north).
EXAMPLES
echo 38SMB4488 | GeoConvert => 33.33424 44.40363
echo 38SMB4488 | GeoConvert -: -p 1 => 33:20:03.25N 044:2413.06E
echo 38SMB4488 | GeoConvert -u => 38n 444500 3688500
echo E44d24 N33d20 | GeoConvert -m -p -3 => 38SMB4488
GeoConvert can be used to do simple arithmetic using degree, minutes, and seconds. For
example, sometimes data is tiled in 15 second squares tagged by the DMS representation of
the SW corner. The tags of the tile at 38:59:45N 077:02:00W and its 8 neighbors are then
given by
t=0:0:15
for y in -$t +0 +$t; do
for x in -$t +0 +$t; do
echo 38:59:45N$y 077:02:00W$x
done
done | GeoConvert -: -p -1 | tr -d ': '
=>
385930N0770215W
385930N0770200W
385930N0770145W
385945N0770215W
385945N0770200W
385945N0770145W
390000N0770215W
390000N0770200W
390000N0770145W
ERRORS
An illegal line of input will print an error message to standard output beginning with
"ERROR:" and causes GeoConvert to return an exit code of 1. However, an error does not
cause GeoConvert to terminate; following lines will be converted.
ABBREVIATIONS
UTM Universal Transverse Mercator,
<https://en.wikipedia.org/wiki/Universal_Transverse_Mercator_coordinate_system>.
UPS Universal Polar Stereographic,
<https://en.wikipedia.org/wiki/Universal_Polar_Stereographic>.
MGRS
Military Grid Reference System,
<https://en.wikipedia.org/wiki/Military_grid_reference_system>.
WGS84
World Geodetic System 1984, <https://en.wikipedia.org/wiki/WGS84>.
SEE ALSO
An online version of this utility is availbable at
<https://geographiclib.sourceforge.io/cgi-bin/GeoConvert>.
The algorithms for the transverse Mercator projection are described in C. F. F. Karney,
Transverse Mercator with an accuracy of a few nanometers, J. Geodesy 85(8), 475-485 (Aug.
2011); DOI <https://doi.org/10.1007/s00190-011-0445-3>; preprint
<https://arxiv.org/abs/1002.1417>.
AUTHOR
GeoConvert was written by Charles Karney.
HISTORY
GeoConvert was added to GeographicLib, <https://geographiclib.sourceforge.io>, in 2009-01.