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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.

       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 +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

       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

       1983-2023