TRANSVERSEMERCATORPROJ(1) GeographicLib Utilities TRANSVERSEMERCATORPROJ(1)NAMETransverseMercatorProj-- perform transverse Mercator projection
SYNOPSISTransverseMercatorProj [ -s | -t ] [ -l lon0 ] [ -k k0 ] [ -r ] [ -e a
f ] [ -w ] [ -p prec ] [ --comment-delimiter commentdelim ] [ --version
| -h | --help ] [ --input-file infile | --input-string instring ] [
--line-separator linesep ] [ --output-file outfile ]
DESCRIPTION
Perform the transverse Mercator projections. Convert geodetic
coordinates to transverse Mercator coordinates. The central meridian
is given by lon0. The longitude of origin is the equator. The scale
on the central meridian is k0. By default an implementation of the
exact transverse Mercator projection is used.
Geodetic coordinates are provided on standard input as a set of lines
containing (blank separated) latitude and longitude (decimal degrees or
degrees, minutes, seconds); for detils on the allowed formats for
latitude and longitude, see the "GEOGRAPHIC COORDINATES" section of
GeoConvert(1). For each set of geodetic coordinates, the corresponding
projected easting, x, and northing, y, (meters) are printed on standard
output together with the meridian convergence gamma (degrees) and scale
k. The meridian convergence is the bearing of the y axis measured
clockwise from true north.
OPTIONS-s use the sixth-order Krueger series approximation to the transverse
Mercator projection instead of the exact projection.
-t use the exact algorithm with the "EXTENDED DOMAIN".
-l specify the longitude of origin lon0 (degrees, default 0).
-k specify the scale k0 on the central meridian (default 0.9996).
-r perform the reverse projection. x and y are given on standard
input and each line of standard output gives latitude, longitude,
gamma, and k.
-e specify the ellipsoid via a f; the equatorial radius is a and the
flattening is f. Setting f = 0 results in a sphere. Specify f < 0
for a prolate ellipsoid. A simple fraction, e.g., 1/297, is
allowed for f. By default, the WGS84 ellipsoid is used, a =
6378137 m, f = 1/298.257223563. If the exact algorithm is used, f
must be positive.
-w on input and output, longitude precedes latitude (except that on
input this can be overridden by a hemisphere designator, N, S, E,
W).
-p set the output precision to prec (default 6). prec is the number
of digits after the decimal point for lengths (in meters). For
latitudes and longitudes (in degrees), the number of digits after
the decimal point is prec + 5. For the convergence (in degrees)
and scale, the number of digits after the decimal point is prec +
6.
--comment-delimiter
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
read input from the file infile instead of from standard input; a
file name of "-" stands for standard input.
--input-string
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
set the line separator character to linesep. By default this is a
semicolon.
--output-file
write output to the file outfile instead of to standard output; a
file name of "-" stands for standard output.
EXTENDED DOMAIN
The exact transverse Mercator projection has a branch point on the
equator at longitudes (relative to lon0) of +/- (1 - e) 90, where e is
the eccentricity of the ellipsoid. The standard convention for
handling this branch point is to map positive (negative) latitudes into
positive (negative) northings y; i.e., a branch cut is placed on the
equator. With the extended domain, the northern sheet of the
projection is extended into the south hemisphere by pushing the branch
cut south from the branch points. See the reference below for details.
EXAMPLES
echo 0 90 | TransverseMercatorProj
=> 25953592.84 9997964.94 90 18.40
echo 260e5 100e5 | TransverseMercatorProj-r
=> -0.02 90.00 90.01 18.48
ERRORS
An illegal line of input will print an error message to standard output
beginning with "ERROR:" and causes TransverseMercatorProj to return an
exit code of 1. However, an error does not cause
TransverseMercatorProj to terminate; following lines will be converted.
AUTHORTransverseMercatorProj was written by Charles Karney.
SEE ALSO
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://dx.doi.org/10.1007/s00190-011-0445-3>; preprint
<http://arxiv.org/abs/1002.1417>. The explanation of the extended
domain of the projection with the -t option is given in Section 5 of
this paper.
HISTORYTransverseMercatorProj was added to GeographicLib,
<http://geographiclib.sf.net>, in 2009-01. Prior to version 1.9 it was
called TransverseMercatorTest (and its interface was slightly
different).
GeographicLib 1.45 2015-09-30 TRANSVERSEMERCATORPROJ(1)
