Provided by: proj-bin_6.3.1-1_amd64 
NAME
projinfo - Geodetic object and coordinate operation queries
SYNOPSIS
projinfo
[-o formats] [-k crs|operation|ellipsoid] [--summary] [-q]
[[--area name_or_code] | [--bbox west_long,south_lat,east_long,north_lat]]
[--spatial-test contains|intersects]
[--crs-extent-use none|both|intersection|smallest]
[--grid-check none|discard_missing|sort] [--show-superseded]
[--pivot-crs always|if_no_direct_transformation|never|{auth:code[,auth:code]*}]
[--boundcrs-to-wgs84]
[--main-db-path path] [--aux-db-path path]*
[--identify] [--3d]
[--c-ify] [--single-line]
{object_definition} | {object_reference} | (-s {srs_def} -t {srs_def})
where {object_definition} or {srs_def} is
• a proj-string,
• a WKT string,
• an object code (like "EPSG:4326", "urn:ogc:def:crs:EPSG::4326",
"urn:ogc:def:coordinateOperation:EPSG::1671"),
• a OGC URN combining references for compound coordinate reference systems (e.g "‐
urn:ogc:def:crs,crs:EPSG::2393,crs:EPSG::5717" or custom abbreviated syntax
"EPSG:2393+5717"),
• a OGC URN combining references for references for projected or derived CRSs e.g. for
Projected 3D CRS "UTM zone 31N / WGS 84 (3D)": "‐
urn:ogc:def:crs,crs:EPSG::4979,cs:PROJ::ENh,coordinateOperation:EPSG::16031" (added
in 6.2)
• a OGC URN combining references for concatenated operations (e.g. "‐
urn:ogc:def:coordinateOperation,coordinateOperation:EPSG::3895,coordinateOperation:EPSG::1618")
• a PROJJSON string. The jsonschema is at
https://proj.org/schemas/v0.1/projjson.schema.json (added in 6.2)
{object_reference} is a filename preceded by the '@' character. The file referenced by
the {object_reference} must contain a valid {object_definition}.
DESCRIPTION
projinfo is a program that can query information on a geodetic object, coordinate
reference system (CRS) or coordinate operation, when the -s and -t options are specified,
and display it under different formats (PROJ string, WKT string or PROJJSON string).
It can also be used to query coordinate operations available between two CRS.
The program is named with some reference to the GDAL gdalsrsinfo that offers partly
similar services.
The following control parameters can appear in any order:
-o formats
formats is a comma separated combination of: all, default, PROJ, WKT_ALL,
WKT2:2015, WKT2:2019, WKT1:GDAL, WKT1:ESRI, PROJJSON.
Except all and default, other formats can be preceded by - to disable them.
NOTE:
WKT2_2019 was previously called WKT2_2018.
NOTE:
Before PROJ 6.3.0, WKT1:GDAL was implicitly calling --boundcrs-to-wgs84. This
is no longer the case.
-k crs|operation|ellipsoid
When used to query a single object with a AUTHORITY:CODE, determines the (k)ind of
the object in case there are CRS, coordinate operations or ellipsoids with the same
CODE. The default is crs.
--summary
When listing coordinate operations available between 2 CRS, return the result in a
summary format, mentioning only the name of the coordinate operation, its accuracy
and its area of use.
NOTE:
only used for coordinate operation computation
-q Turn on quiet mode. Quiet mode is only available for queries on single objects, and
only one output format is selected. In that mode, only the PROJ, WKT or PROJJSON
string is displayed, without other introduction output. The output is then
potentially compatible of being piped in other utilities.
--area name_or_code
Specify an area of interest to restrict the results when researching coordinate
operations between 2 CRS. The area of interest can be specified either as a name
(e.g "Denmark - onshore") or a AUTHORITY:CODE (EPSG:3237) This option is exclusive
of --bbox.
NOTE:
only used for coordinate operation computation
--bbox west_long,south_lat,east_long,north_lat
Specify an area of interest to restrict the results when researching coordinate
operations between 2 CRS. The area of interest is specified as a bounding box with
geographic coordinates, expressed in degrees in a unspecified geographic CRS.
west_long and east_long should be in the [-180,180] range, and south_lat and
north_lat in the [-90,90]. west_long is generally lower than east_long, except in
the case where the area of interest crosses the antimeridian.
NOTE:
only used for coordinate operation computation
--spatial-test contains|intersects
Specify how the area of use of coordinate operations found in the database are
compared to the area of use specified explicitly with --area or --bbox, or derived
implicitly from the area of use of the source and target CRS. By default, projinfo
will only keep coordinate operations whose are of use is strictly within the area
of interest (contains strategy). If using the intersects strategy, the spatial
test is relaxed, and any coordinate operation whose area of use at least partly
intersects the area of interest is listed.
NOTE:
only used for coordinate operation computation
--crs-extent-use none|both|intersection|smallest
Specify which area of interest to consider when no explicit one is specified with
--area or --bbox options. By default (smallest strategy), the area of use of the
source or target CRS will be looked, and the one that is the smallest one in terms
of area will be used as the area of interest. If using none, no area of interest
is used. If using both, only coordinate operations that relate (contain or
intersect depending of the --spatial-test strategy) to the area of use of both CRS
are selected. If using intersection, the area of interest is the intersection of
the bounding box of the area of use of the source and target CRS
NOTE:
only used for coordinate operation computation
--grid-check none|discard_missing|sort
Specify how the presence or absence of a horizontal or vertical shift grid required
for a coordinate operation affects the results returned when researching coordinate
operations between 2 CRS. The default strategy is sort: in that case, all
candidate operations are returned, but the actual availability of the grids is used
to determine the sorting order. That is, if a coordinate operation involves using a
grid that is not available in the PROJ resource directories (determined by the
PROJ_LIB environment variable, it will be listed in the bottom of the results. The
none strategy completely disables the checks of presence of grids and this returns
the results as if all the grids where available. The discard_missing strategy
discards results that involve grids not present in the PROJ resource directories.
NOTE:
only used for coordinate operation computation
-show-superseded
When enabled, coordinate operations that are superseded by others will be listed.
Note that supersession is not equivalent to deprecation: superseded operations are
still considered valid although they have a better equivalent, whereas deprecated
operations have been determined to be erroneous and are not considered at all.
NOTE:
only used for coordinate operation computation
--pivot-crs always|if_no_direct_transformation|never|{auth:code[,auth:code]*}
Determine if intermediate (pivot) CRS can be used when researching coordinate
operation between 2 CRS. A typical example is the WGS84 pivot. By default, projinfo
will consider any potential pivot if there is no direct transformation (
if_no_direct_transformation). If using the never strategy, only direct
transformations between the source and target CRS will be used. If using the always
strategy, intermediate CRS will be considered even if there are direct
transformations. It is also possible to restrict the pivot CRS to consider by
specifying one or several CRS by their AUTHORITY:CODE.
NOTE:
only used for coordinate operation computation
--boundcrs-to-wgs84
When specified, this option researches a coordinate operation from the base
geographic CRS of the single CRS, source or target CRS to the WGS84 geographic CRS,
and if found, wraps those CRS into a BoundCRS object. This is mostly to be used
for early-binding approaches.
--main-db-path path
Specify the name and path of the database to be used by projinfo. The default is
proj.db in the PROJ resource directories.
--aux-db-path path
Specify the name and path of auxiliary databases, that are to be combined with the
main database. Those auxiliary databases must have a table structure that is
identical to the main database, but can be partly filled and their entries can
refer to entries of the main database. The option may be repeated to specify
several auxiliary databases.
--identify
When used with an object definition, this queries the PROJ database to find known
objects, typically CRS, that are close or identical to the object. Each candidate
object is associated with an approximate likelihood percentage. This is useful
when used with a WKT string that lacks a EPSG identifier, such as ESRI WKT1. This
might also be used with PROJ strings. For example, +proj=utm +zone=31 +datum=WGS84
+type=crs will be identified with a likelihood of 70% to EPSG:32631
--3d New in version 6.3.
"Promote" the CRS(s) to their 3D version. In the context of researching available
coordinate transformations, explicitly specifying this option is not necessary,
because when one of the source or target CRS has a vertical component but not the
other one, the one that has no vertical component is automatically promoted to a 3D
version, where its vertical axis is the ellipsoidal height in metres, using the
ellipsoid of the base geodetic CRS.
--c-ify
For developers only. Modify the string output of the utility so that it is easy to
put those strings in C/C++ code
--single-line
Output WKT or PROJJSON strings on a single line, instead of multiple intended lines
by default.
EXAMPLES
1. Query the CRS object corresponding to EPSG:4326
projinfo EPSG:4326
Output:
PROJ.4 string:
+proj=longlat +datum=WGS84 +no_defs +type=crs
WKT2:2019 string:
GEOGCRS["WGS 84",
DATUM["World Geodetic System 1984",
ELLIPSOID["WGS 84",6378137,298.257223563,
LENGTHUNIT["metre",1]]],
PRIMEM["Greenwich",0,
ANGLEUNIT["degree",0.0174532925199433]],
CS[ellipsoidal,2],
AXIS["geodetic latitude (Lat)",north,
ORDER[1],
ANGLEUNIT["degree",0.0174532925199433]],
AXIS["geodetic longitude (Lon)",east,
ORDER[2],
ANGLEUNIT["degree",0.0174532925199433]],
USAGE[
SCOPE["unknown"],
AREA["World"],
BBOX[-90,-180,90,180]],
ID["EPSG",4326]]
2. List the coordinate operations between NAD27 (designed with its CRS name) and NAD83
(designed with its EPSG code 4269) within an area of interest
projinfo -s NAD27 -t EPSG:4269 --area "USA - Missouri"
Output:
DERIVED_FROM(EPSG):1241, NAD27 to NAD83 (1), 0.15 m, USA - CONUS including EEZ
PROJ string:
+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert \
+xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=conus \
+step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1
WKT2:2019 string:
COORDINATEOPERATION["NAD27 to NAD83 (1)",
SOURCECRS[
GEOGCRS["NAD27",
DATUM["North American Datum 1927",
ELLIPSOID["Clarke 1866",6378206.4,294.978698213898,
LENGTHUNIT["metre",1]]],
PRIMEM["Greenwich",0,
ANGLEUNIT["degree",0.0174532925199433]],
CS[ellipsoidal,2],
AXIS["geodetic latitude (Lat)",north,
ORDER[1],
ANGLEUNIT["degree",0.0174532925199433]],
AXIS["geodetic longitude (Lon)",east,
ORDER[2],
ANGLEUNIT["degree",0.0174532925199433]]]],
TARGETCRS[
GEOGCRS["NAD83",
DATUM["North American Datum 1983",
ELLIPSOID["GRS 1980",6378137,298.257222101,
LENGTHUNIT["metre",1]]],
PRIMEM["Greenwich",0,
ANGLEUNIT["degree",0.0174532925199433]],
CS[ellipsoidal,2],
AXIS["geodetic latitude (Lat)",north,
ORDER[1],
ANGLEUNIT["degree",0.0174532925199433]],
AXIS["geodetic longitude (Lon)",east,
ORDER[2],
ANGLEUNIT["degree",0.0174532925199433]]]],
METHOD["CTABLE2"],
PARAMETERFILE["Latitude and longitude difference file","conus"],
OPERATIONACCURACY[0.15],
USAGE[
SCOPE["unknown"],
AREA["USA - CONUS including EEZ"],
BBOX[23.81,-129.17,49.38,-65.69]],
ID["DERIVED_FROM(EPSG)",1241]]
3. Export an object as a PROJJSON string
projinfo GDA94 -o PROJJSON -q
Output:
{
"type": "GeographicCRS",
"name": "GDA94",
"datum": {
"type": "GeodeticReferenceFrame",
"name": "Geocentric Datum of Australia 1994",
"ellipsoid": {
"name": "GRS 1980",
"semi_major_axis": 6378137,
"inverse_flattening": 298.257222101
}
},
"coordinate_system": {
"subtype": "ellipsoidal",
"axis": [
{
"name": "Geodetic latitude",
"abbreviation": "Lat",
"direction": "north",
"unit": "degree"
},
{
"name": "Geodetic longitude",
"abbreviation": "Lon",
"direction": "east",
"unit": "degree"
}
]
},
"area": "Australia - GDA",
"bbox": {
"south_latitude": -60.56,
"west_longitude": 93.41,
"north_latitude": -8.47,
"east_longitude": 173.35
},
"id": {
"authority": "EPSG",
"code": 4283
}
}
SEE ALSO
cs2cs(1), cct(1), geod(1), gie(1), proj(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
Even Rouault
COPYRIGHT
1983-2020