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CartConvert -- convert geodetic coordinates to geocentric or local cartesian


CartConvert [ -r ] [ -l lat0 lon0 h0 ] [ -e a f ] [ -w ] [ -p prec ] [ --comment-delimiter
commentdelim ] [ --version | -h | --help ] [ --input-file infile | --input-string instring
] [ --line-separator linesep ] [ --output-file outfile ]


Convert geodetic coordinates to either geocentric or local cartesian coordinates.
Geocentric coordinates have the origin at the center of the earth, with the z axis going
thru the north pole, and the x axis thru latitude = 0, longitude = 0. By default, the
conversion is to geocentric coordinates. Specifying -l lat0 lon0 h0 causes a local
coordinate system to be used with the origin at latitude = lat0, longitude = lon0, height
= h0, z normal to the ellipsoid and y due north.

Geodetic coordinates are provided on standard input as a set of lines containing (blank
separated) latitude, longitude (decimal degrees or degrees, minutes and seconds), and
height above the ellipsoid (meters); 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 cartesian coordinates x, y, z (meters) are printed
on standard output.


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

-l specifies conversions to and from a local cartesion coordinate systems with origin
lat0 lon0 h0, instead of a geocentric coordinate system. The -w flag can be used to
swap the default order of the 2 geographic coordinates, provided that it appears
before -l.

-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 geocentric and local cartesion coordinates and for the height (in
meters). For latitudes and longitudes (in degrees), the number of digits after the
decimal point is prec + 5.

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).

print version and exit.

-h print usage and exit.

print full documentation and exit.

read input from the file infile instead of from standard input; a file name of "-"
stands for standard input.

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.

set the line separator character to linesep. By default this is a semicolon.

write output to the file outfile instead of to standard output; a file name of "-"
stands for standard output.


echo 33.3 44.4 6000 | CartConvert
=> 3816209.60 3737108.55 3485109.57
echo 33.3 44.4 6000 | CartConvert -l 33 44 20
=> 37288.97 33374.29 5783.64
echo 30000 30000 0 | CartConvert -r
=> 6.483 45 -6335709.73


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

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