Provided by: proj-bin_9.2.1-1_amd64 
NAME
proj - Cartographic projection filter
SYNOPSIS
proj [-beEfiIlmorsStTvVwW] [args]] [+opt[=arg] ...] file ...
invproj [-beEfiIlmorsStTvVwW] [args]] [+opt[=arg] ...] file ...
DESCRIPTION
proj and invproj perform respective forward and inverse conversion of cartographic data to
or from cartesian data with a wide range of selectable projection functions.
invproj may not be available on all platforms; in this case use proj -I instead.
The following control parameters can appear in any order
-b Special option for binary coordinate data input and output through standard input
and standard output. Data is assumed to be in system type double floating point
words. This option is to be used when proj is a child process and allows bypassing
formatting operations.
-d <n>
New in version 5.2.0: Specify the number of decimals to round to in the output.
-i Selects binary input only (see -b).
-I Alternate method to specify inverse projection. Redundant when used with invproj.
-o Selects binary output only (see -b).
-t<a> Where 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>
Where string is an arbitrary string to be output if an error is detected during
data transformations. The default value is a three character string: *\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<[=id]>
List projection identifiers that can be selected with +proj. proj -l=id gives
expanded description of projection id, e.g. proj -l=merc.
-lp List of all projection id that can be used with the +proj parameter. Equivalent to
proj -l.
-lP Expanded description of all projections that can be used with the +proj parameter.
-le List of all ellipsoids that can be selected with the +ellps parameters.
-lu List of all distance units that can be selected with the +units parameter.
-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.
-S Causes estimation of meridional and parallel scale factors, area scale factor and
angular distortion, and maximum and minimum scale factors to be listed between <>
for each input point. For conformal projections meridional and parallel scales
factors will be equal and angular distortion zero. Equal area projections will have
an area factor of 1.
-m <mult>
The cartesian data may be scaled by the mult parameter. When processing data in a
forward projection mode the cartesian output values are multiplied by mult
otherwise the input cartesian values are divided by mult before inverse projection.
If the first two characters of mult are 1/ or 1: then the reciprocal value of mult
is employed.
-f <format>
Where format is a printf format string to control the form of the output values.
For inverse projections, the output will be in degrees when this option is
employed. The default format is "%.2f" for forward projection and DMS for inverse.
-w<n> Where n is the number of significant fractional digits to employ for seconds output
(when the option is not specified, -w3 is assumed).
-W<n> Where n is the number of significant fractional digits to employ for seconds
output. When -W is employed the fields will be constant width 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.
-V This option causes an expanded annotated listing of the characteristics of the
projected point. -v is implied with this option.
The +opt run-line arguments are associated with cartographic parameters. Additional
projection control parameters may be contained in two auxiliary 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 established from either the run-line or the contents
of +init file. The environment parameter PROJ_DATA 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
converted. A - will specify the location of processing standard input. If no files are
specified, the input is assumed to be from stdin. For ASCII 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 trailing portions of the input line are appended to the output line.
Input geographic data (longitude and latitude) must be in DMS or decimal degrees format
and input cartesian data must be in units consistent with the ellipsoid major axis or
sphere radius units. Output geographic 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
proj +proj=utm +lon_0=112w +ellps=clrk66 -r <<EOF
45d15'33.1" 111.5W
45d15.551666667N -111d30
+45.25919444444 111d30'000w
EOF
will perform UTM forward projection with a standard UTM central meridian nearest longitude
112W. 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:
460769.27 5011648.45
OTHER PROGRAMS
The proj program is limited to converting between geographic and projected coordinates
within one datum.
The cs2cs program operates similarly, but allows translation between any pair of definable
coordinate reference systems, including support for datum translation.
SEE ALSO
cs2cs(1), cct(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
Gerald I. Evenden
COPYRIGHT
1983-2023