1CS2CS(1) PROJ CS2CS(1)
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6 cs2cs - Cartographic coordinate system filter
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9 cs2cs [-eEfIlrstvwW [args]]
10 [[--area <name_or_code>] | [--bbox <west_long,south_lat,east_long,north_lat>]]
11 [--authority <name>] [--no-ballpark] [--accuracy <accuracy>]
12 ([+opt[=arg] ...] [+to +opt[=arg] ...] | {source_crs} {target_crs})
13 file ...
14 where {source_crs} or {target_crs} is one of the possibilities ac‐
17 cepted by proj_create(), provided it expresses a CRS
18 • a proj-string,
20 • a WKT string,
22 • an object code (like "EPSG:4326", "urn:ogc:def:crs:EPSG::4326",
24 "urn:ogc:def:coordinateOperation:EPSG::1671"),
25 • an Object name. e.g "WGS 84", "WGS 84 / UTM zone 31N". In that
27 case as uniqueness is not guaranteed, heuristics are applied to
28 determine the appropriate best match.
29 • a OGC URN combining references for compound coordinate reference
31 systems (e.g "urn:ogc:def:crs,crs:EPSG::2393,crs:EPSG::5717" or
32 custom abbreviated syntax "EPSG:2393+5717"),
33 • a OGC URN combining references for references for projected or de‐
35 rived CRSs e.g. for Projected 3D CRS "UTM zone 31N / WGS 84 (3D)":
36 "‐
37 urn:ogc:def:crs,crs:EPSG::4979,cs:PROJ::ENh,coordinateOpera‐
38 tion:EPSG::16031" (added in 6.2)
39 • a OGC URN combining references for concatenated operations (e.g.
41 "‐
42 urn:ogc:def:coordinateOperation,coordinateOperation:EPSG::3895,co‐
43 ordinateOperation:EPSG::1618")
44 • a PROJJSON string. The jsonschema is at
46 https://proj.org/schemas/v0.4/projjson.schema.json (added in 6.2)
47 • a compound CRS made from two object names separated with " + ".
49 e.g. "WGS 84 + EGM96 height" (added in 7.1)
50 New in version 6.0.0.
52 NOTE:
55 before 7.0.1, it was needed to add +to between {source_crs} and
56 {target_crs} when adding a filename
57
59 cs2cs performs transformation between the source and destination carto‐
60 graphic coordinate reference system on a set of input points. The coor‐
61 dinate reference system transformation can include translation between
62 projected and geographic coordinates as well as the application of da‐
63 tum shifts.
64 The following control parameters can appear in any order:
66 -I Method to specify inverse translation, convert from +to coordi‐
68 nate system to the primary coordinate system defined.
69 -t<a> Where a specifies a character employed as the first character to
71 denote a control line to be passed through without processing.
72 This option applicable to ASCII input only. (# is the default
73 value).
74 -d <n> New in version 5.2.0.
76 Specify the number of decimals in the output.
79 -e <string>
81 Where string is an arbitrary string to be output if an error is
82 detected during data transformations. The default value is a
83 three character string: *\t*.
84 -E Causes the input coordinates to be copied to the output line
86 prior to printing the converted values.
87 -l<[=id]>
89 List projection identifiers that can be selected with +proj.
90 cs2cs -l=id gives expanded description of projection id, e.g.
91 cs2cs -l=merc.
92 -lp List of all projection id that can be used with the +proj param‐
94 eter. Equivalent to cs2cs -l.
95 -lP Expanded description of all projections that can be used with
97 the +proj parameter.
98 -le List of all ellipsoids that can be selected with the +ellps pa‐
100 rameters.
101 -lu List of all distance units that can be selected with the +units
103 parameter.
104 -r This options reverses the order of the first two expected inputs
106 from that specified by the CRS to the opposite order. The third
107 coordinate, typically height, remains third.
108 -s This options reverses the order of the first two expected out‐
110 puts from that specified by the CRS to the opposite order. The
111 third coordinate, typically height, remains third.
112 -f <format>
114 Where format is a printf format string to control the form of
115 the output values. For inverse projections, the output will be
116 in degrees when this option is employed. If a format is speci‐
117 fied for inverse projection the output data will be in decimal
118 degrees. The default format is "%.2f" for forward projection and
119 DMS for inverse.
120 -w<n> Where n is the number of significant fractional digits to employ
122 for seconds output (when the option is not specified, -w3 is as‐
123 sumed).
124 -W<n> Where n is the number of significant fractional digits to employ
126 for seconds output. When -W is employed the fields will be con‐
127 stant width with leading zeroes.
128 -v Causes a listing of cartographic control parameters tested for
130 and used by the program to be printed prior to input data.
131 --area <name_or_code>
133 New in version 8.0.0.
134 Specify an area of interest to restrict the results when re‐
137 searching coordinate operations between 2 CRS. The area of in‐
138 terest can be specified either as a name (e.g "Denmark - on‐
139 shore") or a AUTHORITY:CODE (EPSG:3237)
140 This option is mutually exclusive with --bbox.
142 --bbox <west_long,south_lat,east_long,north_lat>
144 New in version 8.0.0.
145 Specify an area of interest to restrict the results when re‐
148 searching coordinate operations between 2 CRS. The area of in‐
149 terest is specified as a bounding box with geographic coordi‐
150 nates, expressed in degrees in a unspecified geographic CRS.
151 west_long and east_long should be in the [-180,180] range, and
152 south_lat and north_lat in the [-90,90]. west_long is generally
153 lower than east_long, except in the case where the area of in‐
154 terest crosses the antimeridian.
155 --no-ballpark
157 New in version 8.0.0.
158 Disallow any coordinate operation that is, or contains, a Ball‐
161 park transformation
162 --accuracy <accuracy>
164 New in version 8.0.0.
165 Sets the minimum desired accuracy for candidate coordinate oper‐
168 ations.
169 --authority <name>
171 New in version 8.0.0.
172 This option can be used to restrict the authority of coordinate
175 operations looked up in the database. When not specified, coor‐
176 dinate operations from any authority will be searched, with the
177 restrictions set in the authority_to_authority_preference data‐
178 base table related to the authority of the source/target CRS
179 themselves. If authority is set to any, then coordinate opera‐
180 tions from any authority will be searched If authority is a
181 non-empty string different of any, then coordinate operations
182 will be searched only in that authority namespace (e.g EPSG).
183 This option is mutually exclusive with --bbox.
185 The +opt run-line arguments are associated with cartographic parame‐
187 ters.
188 The cs2cs program requires two coordinate reference system (CRS) defi‐
190 nitions. The first (or primary is defined based on all projection pa‐
191 rameters not appearing after the +to argument. All projection parame‐
192 ters appearing after the +to argument are considered the definition of
193 the second CRS. If there is no second CRS defined, a geographic CRS
194 based on the datum and ellipsoid of the source CRS is assumed. Note
195 that the source and destination CRS can both of same or different na‐
196 ture (geographic, projected, compound CRS), or one of each and may have
197 the same or different datums.
198 When using a WKT definition or a AUTHORITY:CODE, the axis order of the
200 CRS will be enforced. So for example if using EPSG:4326, the first
201 value expected (or returned) will be a latitude.
202 Internally, cs2cs uses the proj_create_crs_to_crs() function to compute
204 the appropriate coordinate operation, so implementation details of this
205 function directly impact the results returned by the program.
206 The environment parameter PROJ_LIB establishes the directory for re‐
208 source files (database, datum shift grids, etc.)
209 One or more files (processed in left to right order) specify the source
211 of data to be transformed. A - will specify the location of processing
212 standard input. If no files are specified, the input is assumed to be
213 from stdin. For input data the two data values must be in the first
214 two white space separated fields and when both input and output are
215 ASCII all trailing portions of the input line are appended to the out‐
216 put line.
217 Input geographic data (longitude and latitude) must be in DMS or deci‐
219 mal degrees format and input cartesian data must be in units consistent
220 with the ellipsoid major axis or sphere radius units. Output geographic
221 coordinates will normally be in DMS format (use -f %.12f for decimal
222 degrees with 12 decimal places), while projected (cartesian) coordi‐
223 nates will be in linear (meter, feet) units.
224 Use of remote grids
226 New in version 7.0.0.
227 If the PROJ_NETWORK environment variable is set to ON, cs2cs will at‐
230 tempt to use remote grids stored on CDN (Content Delivery Network)
231 storage, when they are not available locally.
232 More details are available in the network section.
234
236 Using PROJ strings
237 The following script
238 cs2cs +proj=latlong +datum=NAD83 +to +proj=utm +zone=10 +datum=NAD27 -r <<EOF
240 45°15'33.1" 111.5W
241 45d15.551666667N -111d30
242 +45.25919444444 111d30'000w
243 EOF
244 will transform the input NAD83 geographic coordinates into NAD27 coor‐
246 dinates in the UTM projection with zone 10 selected. The geographic
247 values of this example are equivalent and meant as examples of various
248 forms of DMS input. The x-y output data will appear as three lines of:
249 1402293.44 5076292.68 0.00
251 Using EPSG CRS codes
253 Transforming from WGS 84 latitude/longitude (in that order) to UTM Zone
254 31N/WGS 84
255 cs2cs EPSG:4326 EPSG:32631 <<EOF
257 45N 2E
258 EOF
259 outputs
261 421184.70 4983436.77 0.00
263 Using EPSG CRS names
265 Transforming from WGS 84 latitude/longitude (in that order) with EGM96
266 height to UTM Zone 31N/WGS 84 with WGS84 ellipsoidal height
267 echo 45 2 0 | cs2cs "WGS 84 + EGM96 height" "WGS 84 / UTM zone 31N"
269 outputs
271 421184.70 4983436.77 50.69
273
275 proj(1), cct(1), geod(1), gie(1), projinfo(1), projsync(1)
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278 A list of known bugs can be found at
279 https://github.com/OSGeo/PROJ/issues where new bug reports can be sub‐
280 mitted to.
281
283 https://proj.org/
284
286 Frank Warmerdam
287
289 1983-2021
2908.2.0 Nov 1, 2021 CS2CS(1)