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PROJ(1) PROJ PROJ(1) NAME proj - Cartographic projection filter SYNOPSIS proj [-beEfiIlmorsStTvVwW] [args]] ([+opt[=arg] ...] | {crs}) file ... invproj [-beEfiIlmorsStTvVwW] [args]] ([+opt[=arg] ...] | {crs}) file ... DESCRIPTION proj and invproj perform respective forward and inverse conversion of car- tographic 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 in- stead. 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> Added 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 de- note 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 de- tected 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 parame- ters. -lu List of all distance units that can be selected with the +units pa- rameter. -r This options reverses the order of the expected input from longi- tude-latitude or x-y to latitude-longitude or y-x. -s This options reverses the order of the output from x-y or longi- tude-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 pro- cessing data in a forward projection mode the cartesian output val- ues are multiplied by mult otherwise the input cartesian values are divided by mult before inverse projection. If the first two charac- ters of mult are 1/ or 1: then the reciprocal value of mult is em- ployed. -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 de- grees 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 characteris- tics 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 <#envvar-PROJ_DATA> establishes the de- fault directory for a file reference without an absolute path. This is also used for supporting files like datum shift files. Added in version 9.3.0: {crs} is one of the possibilities accepted by :c:proj_create(), provided it expresses a projected CRS, like a WKT string, an object code (like "EPSG:32632") a PROJJSON string, etc. The projection computed will be those of the map projection implied by the transformation from the base geographic CRS of the projected CRS to the projected CRS. 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 trail- ing 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 coordi- nates 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 +zone=12 -r <<EOF 45d15'33.1" 111.5W 45d15.551666667N -111d30 +45.25919444444 111d30'000w EOF will perform UTM zone 12 forward projection. The default +ellps=GRS80 is used as no +ellps was specified. 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: 460770.43 5011865.86 This other example proj EPSG:6421 -V <<EOF -120 35.8 EOF Will perform the projection of the coordinates in "NAD83(2011) / California zone 4" (EPSG:6421) into its geographic system, "NAD83(2011)", showing the expanded annotated listing. The output will appear as: #Lambert Conformal Conic # Conic, Sph&Ell # lat_1= and lat_2= or lat_0, k_0= # +proj=lcc +lat_0=35.3333333333333 +lon_0=-119 +lat_1=37.25 +lat_2=36 # +x_0=2000000 +y_0=500000 +ellps=GRS80 #Final Earth figure: ellipsoid # Major axis (a): 6378137.000 # 1/flattening: 298.257222 # squared eccentricity: 0.006694380023 Longitude: 120dW [ -120 ] Latitude: 35d48'N [ 35.8 ] Easting (x): 1909606.87 Northing (y): 552253.58 Meridian scale (h) : 1.00004382 ( 0.004382 % error ) Parallel scale (k) : 1.00004382 ( 0.004382 % error ) Areal scale (s): 1.00008765 ( 0.008765 % error ) Angular distortion (w): 0.000 Meridian/Parallel angle: 90.00000 Convergence : -0d35'47.714" [ -0.59658715 ] Max-min (Tissot axis a-b) scale error: 1.00004 1.00004 OTHER PROGRAMS The proj program is limited to converting between geographic and projected coordinates within one datum. The cs2cs <#cs2cs> program operates similarly, but allows translation be- tween 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 1983-2026, PROJ contributors 9.8 10 avril 2026 PROJ(1)
NAME | SYNOPSIS | DESCRIPTION | EXAMPLE | OTHER PROGRAMS | SEE ALSO | BUGS | HOME PAGE | Author | Copyright
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