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CARTCONVERT(1)		     GeographicLib Utilities		  CARTCONVERT(1)

NAME
     CartConvert  --  convert geodetic coordinates to geocentric or local carte-
     sian

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

DESCRIPTION
     Convert  geodetic coordinates to either geocentric or local cartesian coor-
     dinates.  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 lati-
     tude = 0, longitude = 0.  By default, the conversion is to geocentric coor-
     dinates.  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  con-
     taining  (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 CO-
     ORDINATES" 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)  cor-
	 responds 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 el-
	 lipsoid.   A  simple  fraction,  e.g., 1/297, is allowed for f.  By de-
	 fault, 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 coor-
	 dinates  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  semi-
	 colon) 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 be-
     ginning  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.source-
     forge.io>, in 2009-02.  Prior to 2009-03 it was called ECEFConvert.

GeographicLib 2.2		   2022-12-13			  CARTCONVERT(1)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=CartConvert&sektion=1&manpath=FreeBSD+Ports+15.1.quarterly>

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