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

6.3.1                                             Feb 10, 2020                                            CCT(1)