PROJ(1)                                                                PROJ(1)


NAME
       cs2cs - cartographic coordinate system filter

SYNOPSIS
       cs2cs [ -eEfIlrstvwW [ args ] ] [ +opts[=arg] ]
             [ +to [+opts[=arg]] ] file[s]

DESCRIPTION
       Cs2cs performs transformation between the source
       and destination cartographic  coordinate  system
       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:

       -I     method  to  specify  inverse translation,
              convert from +to coordinate system to the
              primary coordinate system defined.

       -ta    A  specifies  a character employed as the
              first character to denote a control  line
              to  be passed through without processing.
              This option  applicable  to  ascii  input
              only.  (# is the default value).

       -e string
              String  is an arbitrary string to be out‐
              put if an error is detected  during  data
              transformations.   The  default value is:
              *\t*.  Note that if  the  -b,  -i  or  -o
              options   are   employed,   an  error  is
              returned  as  HUGE_VAL  value  for   both
              return values.

       -E     causes the input coordinates to be copied
              to the output line prior to printing  the
              converted values.

       -l[p|P|=|e|u|d]id
              List  projection identifiers with -l, -lp
              or -lP (expanded) that  can  be  selected
              with   +proj.    -l=id   gives   expanded
              description  of  projection   id.    List
              ellipsoid  identifiers with -le, that can
              be selected  with  +ellps,  -lu  list  of
              cartesian  to  meter  conversion  factors
              that can be selected with +units  or  -ld
              list  of datums that can be selected with
              +datum.

       -r     This options reverses the  order  of  the
              expected input from longitude-latitude or
              x-y to latitude-longitude or y-x.

       -s     This options reverses the  order  of  the
              output  from x-y or longitude-latitude to
              y-x or latitude-longitude.

       -f format
              Format is a printf format string to  con‐
              trol  the form of the output values.  For
              inverse projections, the output  will  be
              in  degrees when this option is employed.
              If a format is specified for inverse pro‐
              jection  the output data will be in deci‐
              mal  degrees.   The  default  format   is
              "%.2f" for forward projection and DMS for
              inverse.

       -[w|W]n
              N is the number of significant fractional
              digits to employ for seconds output (when
              the  option  is  not  specified,  -w3  is
              assumed).  When -W is employed the fields
              will be constant width and  with  leading
              zeroes.

       -v     causes  a listing of cartographic control
              parameters tested for  and  used  by  the
              program  to  be  printed  prior  to input
              data.  Should not be  used  with  the  -T
              option.

       The +args run-line arguments are associated with
       cartographic parameters and  usage  varies  with
       projection  and  for  a complete description see
       Cartographic Projection Procedures for the  UNIX
       Environment—A  User’s Manual ) and supplementary
       documentation for Release 4.

       The cs2cs program requires two coordinate system
       definitions.   The  first (or primary is defined
       based on all projection parameters not appearing
       after  the +to argument.  All projection parame‐
       ters appearing after the +to argument  are  con‐
       sidered  the definition of the second coordinate
       system.  If there is no second coordinate system
       defined, a geographic coordinate system based on
       the datum and ellipsoid of the source coordinate
       system  is  assumed.   Note  that the source and
       destination coordinate system can both  be  pro‐
       jections, both be geographic, or one of each and
       may have the same or different datums.

       Additional projection control parameters may  be
       contained  in  two auxilliary control files: the
       first  is   optionally   referenced   with   the
       +init=file:id and the second is always processed
       after the name of the projection has been estab‐
       lished  from either the run-line or the contents
       of  +init  file.   The   environment   parameter
       PROJ_LIB establishes the default directory for a
       file reference without an absolute  path.   This
       is  also  used  for  supporting files like datum
       shift files.

       One or more files (processed in  left  to  right
       order)  specify  the source of data to be trans‐
       formed.  A - will specify the location  of  pro‐
       cessing  standard input.  If no files are speci‐
       fied, the input is assumed  to  be  from  stdin.
       For  input  data  the two data values must be in
       the first two white space separated  fields  and
       when  both input and output are ASCII all trail‐
       ing portions of the input line are  appended  to
       the output line.

       Input  geographic  data (longitude and latitude)
       must be in DMS format and input  cartesian  data
       must  be  in units consistent with the ellipsoid
       major axis or sphere radius units.  Output  geo‐
       graphic  coordinates  will  be in DMS (if the -w
       switch is not employed) and  precise  to  0.001"
       with  trailing, zero-valued minute-second fields
       deleted.

EXAMPLE
       The following script
             cs2cs +proj=latlong +datum=NAD83
                   +to +proj=utm +zone=10  +datum=NAD27
            -r <<EOF
             45d15’33.1"   111.5W
             45d15.551666667N   -111d30
             +45.25919444444    111d30’000w
             EOF
       will  transform the input NAD83 geographic coor‐
       dinates into NAD27 coordinates in the  UTM  pro‐
       jection  with  zone 10 selected.  The geographic
       values of this example are equivalent and  meant
       as  examples of various forms of DMS input.  The
       x-y output data will appear as three lines of:
             1402285.99      5076292.42 0.000

SEE ALSO
       proj(1U),
       Cartographic Projection Procedures for the  UNIX
       Environment—A  User’s  Manual,  (Evenden,  1990,
       Open-file report 90-284).
       Map Projections Used by  the  U.  S.  Geological
       Survey (Snyder, 1984, USGS Bulletin 1532).
       Map  Projections—A Working Manual (Synder, 1988,
       USGS Prof. Paper 1395).
       An Album of Map Projections (Snyder  &  Voxland,
       1989, USGS Prof. Paper 1453).

HOME PAGE
       http://www.remotesensing.org/proj



                              2000/03/21 Rel. 4.4                      PROJ(1)