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