NAME

       cct - Coordinate Conversion and Transformation

SYNOPSIS

          cct [-cIostvz [args]] +opt[=arg] ... file ...

DESCRIPTION

       cct  a  4D  equivalent  to the proj projection program, performs transformation coordinate
       systems on a set of  input  points.  The  coordinate  system  transformation  can  include
       translation  between  projected  and  geographic coordinates as well as the application of
       datum shifts.

       The following control parameters can appear in any order:

       -c <x,y,z,t>
              Specify input columns for (up to) 4 input parameters. Defaults to 1,2,3,4.

       -d <n>

       New in version 5.2.0: Specify the number of decimals in the output.

       -I     Do the inverse transformation.

       -o <output file name>, --output=<output file name>
              Specify the name of the output file.

       -t <time>, --time=<time>
              Specify a fixed observation time to be used for all input data.

       -z <height>, --height=<height>
              Specify a fixed observation height to be used for all input data.

       -s <n>, --skip-lines=<n>
              New in version 5.1.0.

              Skip the first n lines of input. This applies to any  kind  of  input,  whether  it
              comes from STDIN, a file or interactive user input.

       -v, --verbose
              Write  non-essential,  but  potentially  useful, information to stderr.  Repeat for
              additional information (-vv, -vvv, etc.)

       --version
              Print version number.

       The +opt arguments are associated with coordinate operation parameters.  Usage varies with
       operation.

       cct is an acronym meaning Coordinate Conversion and Transformation.

       The   acronym   refers  to  definitions  given  in  the  OGC  08-015r2/ISO-19111  standard
       "Geographical Information --  Spatial  Referencing  by  Coordinates",  which  defines  two
       different classes of coordinate operations:

       Coordinate  Conversions,  which are coordinate operations where input and output datum are
       identical (e.g. conversion from geographical to cartesian coordinates) and

       Coordinate Transformations, which are coordinate operations where input and output  datums
       differ (e.g. change of reference frame).

EXAMPLES

       1. The operator specs describe the action to be performed by cct. So the following script

          echo 12 55 0 0 | cct +proj=utm +zone=32 +ellps=GRS80

       will  transform the input geographic coordinates into UTM zone 32 coordinates.  Hence, the
       command

          echo 12 55 | cct -z0 -t0 +proj=utm +zone=32 +ellps=GRS80

       Should give results comparable to the classic proj command

          echo 12 55 | proj +proj=utm +zone=32 +ellps=GRS80

       2. Convert geographical input to UTM zone 32 on the GRS80 ellipsoid:

          cct +proj=utm +ellps=GRS80 +zone=32

       3. Roundtrip accuracy check for the case above:

          cct +proj=pipeline +proj=utm +ellps=GRS80 +zone=32 +step +step +inv

       4. As (2) but specify input columns for longitude, latitude, height and time:

          cct -c 5,2,1,4 +proj=utm +ellps=GRS80 +zone=32

       5. As (2) but specify fixed height and time, hence needing only 2 cols in input:

          cct -t 0 -z 0 +proj=utm +ellps=GRS80 +zone=32

       6. Auxiliary data following the coordinate input is forward to the output stream:

          $ echo 12 56 100 2018.0 auxiliary data | cct +proj=merc
          1335833.8895   7522963.2411      100.0000     2018.0000 auxiliary data

BACKGROUND

       cct also refers to Carl Christian Tscherning (1942--2014), professor  of  Geodesy  at  the
       University  of  Copenhagen,  mentor  and  advisor  for  a generation of Danish geodesists,
       colleague and collaborator for two generations of global geodesists, Secretary General for
       the  International  Association  of  Geodesy,  IAG  (1995--2007),  fellow  of the American
       Geophysical Union (1991), recipient of  the  IAG  Levallois  Medal  (2007),  the  European
       Geosciences Union Vening Meinesz Medal (2008), and of numerous other honours.

       cct,  or  Christian,  as he was known to most of us, was recognized for his good mood, his
       sharp wit, his tireless work, and his great commitment to the development  of  geodesy  --
       both  through  his scientific contributions, comprising more than 250 publications, and by
       his mentoring and teaching of the next generations of geodesists.

       As Christian was an avid Fortran programmer, and a keen Unix connoisseur,  he  would  have
       enjoyed to know that his initials would be used to name a modest Unix style transformation
       filter, hinting at the tireless aspect of his personality, which was certainly one of  the
       reasons he accomplished so much, and meant so much to so many people.

       Hence, in honour of cct (the geodesist) this is cct (the program).

SEE ALSO

       proj(1), cs2cs(1), geod(1), gie(1), projinfo(1)

BUGS

       A  list  of  know  bugs can be found at https://github.com/OSGeo/PROJ/issues where new bug
       reports can be submitted to.

HOME PAGE

       https://proj.org/

AUTHOR

       Thomas Knudsen

COPYRIGHT

       1983-2020