NAME

       CartConvert -- convert geodetic coordinates to geocentric or local cartesian

SYNOPSIS

       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 ]

DESCRIPTION

       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.

OPTIONS

       -r  perform the reverse projection.  x, y, z are given on standard input and each line of standard output
           gives  latitude,  longitude,  height.   In  general there are multiple solutions and the result which
           minimizes the absolute value of height is returned, i.e., (latitude, longitude)  corresponds  to  the
           closest point on the ellipsoid.

       -l lat0 lon0 h0
           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 a f
           specify the ellipsoid via the equatorial radius, a and the flattening, 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  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 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.

       --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.

EXAMPLES

          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

ERRORS

       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.

SEE ALSO

       The  algorithm  for  converting  geocentric  to  geodetic  coordinates is given in Appendix B of C. F. F.
       Karney, Geodesics on an ellipsoid of revolution, Feb. 2011; preprint <https://arxiv.org/abs/1102.1215>.

AUTHOR

       CartConvert was written by Charles Karney.

HISTORY

       CartConvert was added to GeographicLib, <https://geographiclib.sourceforge.io>,  in  2009-02.   Prior  to
       2009-03 it was called ECEFConvert.

GeographicLib 2.3                                  2023-07-25                                     CARTCONVERT(1)