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NAME

       cct - Coordinate Conversion and Transformation

SYNOPSIS

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

       or
          cct [-cIostvz [args]] {object_definition} file ...

       Where  {object_definition} is one of the possibilities accepted by proj_create(), provided
       it expresses a coordinate operation

          • a proj-string,

          • a WKT string,

          • an object code (like "EPSG:1671" "urn:ogc:def:coordinateOperation:EPSG::1671"),

          • an object name. e.g. "ITRF2014 to ETRF2014 (1)". In that case as  uniqueness  is  not
            guaranteed, heuristics are applied to determine the appropriate best match.

          • a   OGC   URN   combining   references   for   concatenated   operations   (e.g.   "‐
            urn:ogc:def:coordinateOperation,coordinateOperation:EPSG::3895,coordinateOperation:EPSG::1618")

          • a         PROJJSON         string.         The         jsonschema        is        at
            https://proj.org/schemas/v0.4/projjson.schema.json

          New in version 8.0.0.

          NOTE:
              Before version 8.0.0 only proj-strings could be used to instantiate  operations  in
              cct.

       or
          cct [-cIostvz [args]] {object_reference} file ...

       where {object_reference} is a filename preceded by the '@' character.  The file referenced
       by the {object_reference} must contain a valid {object_definition}.
          New in version 8.0.0.

DESCRIPTION

       cct is 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.

       Note  however that unlike the proj, angular input must be in decimal degrees.  Any minutes
       and seconds given will be silently dropped.

       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 to round to 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).

USE OF REMOTE GRIDS

       New in version 7.0.0.

       If  the  PROJ_NETWORK  environment  variable  is set to ON, cct will attempt to use remote
       grids stored on CDN (Content Delivery  Network)  storage,  when  they  are  not  available
       locally.

       More details are available in the Network capabilities section.

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 +ellps=GRS80 +zone=32 +step +proj=utm +step +proj=utm +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 forwarded 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

       7. Coordinate operation referenced through its code

          $ echo 3541657.3778 948984.2343 5201383.5231 2020.5 | cct EPSG:8366
          3541657.9112    948983.7503  5201383.2482     2020.5000

       8. Coordinate operation referenced through its name

          $ echo 3541657.3778 948984.2343 5201383.5231 2020.5 | cct "ITRF2014 to ETRF2014 (1)"
          3541657.9112    948983.7503  5201383.2482     2020.5000

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), projsync(1)

BUGS

       A  list  of  known 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

       1983-2024, PROJ contributors