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PROGRAM:

NAME


GeodesicProj -- perform projections based on geodesics

SYNOPSIS


GeodesicProj ( -z | -c | -g ) lat0 lon0 [ -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 projections based on geodesics. Convert geodetic coordinates to either azimuthal
equidistant, Cassini-Soldner, or gnomonic coordinates. The center of the projection
(lat0, lon0) is specified by either the -c option (for Cassini-Soldner), the -z option
(for azimuthal equidistant), or the -g option (for gnomonic). At least one of these
options must be given (the last one given 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
details 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 coordinates x, y (meters) are printed on standard output together
with the azimuth azi (degrees) and reciprocal scale rk. For Cassini-Soldner, azi is the
bearing of the easting direction and the scale in the easting direction is 1 and the scale
in the northing direction is 1/rk. For azimuthal equidistant and gnomonic, azi is the
bearing of the radial direction and the scale in the azimuthal direction is 1/rk. For
azimuthal equidistant and gnomonic, the scales in the radial direction are 1 and 1/rk^2,
respectively.

OPTIONS


-z use the azimuthal equidistant projection centered at latitude = lat0, longitude =
lon0. The -w flag can be used to swap the default order of the 2 coordinates,
provided that it appears before -z.

-c use the Cassini-Soldner projection centered at latitude = lat0, longitude = lon0. The
-w flag can be used to swap the default order of the 2 coordinates, provided that it
appears before -c.

-g use the ellipsoidal gnomonic projection centered at latitude = lat0, longitude = lon0.
The -w flag can be used to swap the default order of the 2 coordinates, provided that
it appears before -g.

-r perform the reverse projection. x and y are given on standard input and each line of
standard output gives latitude, longitude, azi, and rk.

-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.

-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, longitudes, and azimuths (in
degrees), the number of digits after the decimal point is prec + 5. For the 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.

EXAMPLES


echo 48.648 -2.007 | GeodesicProj -c 48.836 2.337
=> -319919 -11791 86.7 0.999
echo -319919 -11791 | GeodesicProj -c 48.836 2.337 -r
=> 48.648 -2.007 86.7 0.999

ERRORS


An illegal line of input will print an error message to standard output beginning with
"ERROR:" and causes GeodesicProj to return an exit code of 1. However, an error does not
cause GeodesicProj to terminate; following lines will be converted.

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