gdaltransform¶
Transforms coordinates.
Synopsis¶
gdaltransform [helpgeneral]
[i] [s_srs srs_def] [t_srs srs_def] [to "NAME=VALUE"]
[ct proj_string] [order n] [tps] [rpc] [geoloc]
[gcp pixel line easting northing [elevation]]* [output_xy]
[srcfile [dstfile]]
Description¶
The gdaltransform utility reprojects a list of coordinates into any supported projection,including GCPbased transformations.

s_srs
<srs_def>
¶ Set source spatial reference. The coordinate systems that can be passed are anything supported by the OGRSpatialReference.SetFromUserInput() call, which includes EPSG PCS and GCSes (i.e. EPSG:4296), PROJ.4 declarations (as above), or the name of a .prj file containing well known text.

t_srs
<srs_def>
¶ set target spatial reference. The coordinate systems that can be passed are anything supported by the OGRSpatialReference.SetFromUserInput() call, which includes EPSG PCS and GCSes (i.e. EPSG:4296), PROJ.4 declarations (as above), or the name of a .prj file containing well known text.

ct
<string>
¶ A PROJ string (single step operation or multiple step string starting with +proj=pipeline), a WKT2 string describing a CoordinateOperation, or a urn:ogc:def:coordinateOperation:EPSG::XXXX URN overriding the default transformation from the source to the target CRS. It must take into account the axis order of the source and target CRS.
New in version 3.0.

to
NAME=VALUE
¶ set a transformer option suitable to pass to
GDALCreateGenImgProjTransformer2()
.

order
<n>
¶ order of polynomial used for warping (1 to 3). The default is to select a polynomial order based on the number of GCPs.

tps
¶
Force use of thin plate spline transformer based on available GCPs.

rpc
¶
Force use of RPCs.

geoloc
¶
Force use of Geolocation Arrays.

i
¶
Inverse transformation: from destination to source.

gcp
<pixel> <line> <easting> <northing> [<elevation>]
¶ Provide a GCP to be used for transformation (generally three or more are required)

output_xy
¶
Restrict output to “x y” instead of “x y z”

<srcfile>
¶
File with source projection definition or GCP’s. If not given, source projection is read from the commandline
s_srs
orgcp
parameters

<dstfile>
¶
File with destination projection definition.
Coordinates are read as pairs, triples for 3D or, since GDAL 3.0.0, quadruplets for X,Y,Z,time of numbers per line from standard input, transformed, and written out to standard output in the same way. All transformations offered by gdalwarp are handled, including gcpbased ones.
Note that input and output must always be in decimal form. There is currently no support for DMS input or output.
If an input image file is provided, input is in pixel/line coordinates on that image. If an output file is provided, output is in pixel/line coordinates on that image.
Examples¶
Reprojection Example¶
Simple reprojection from one projected coordinate system to another:
gdaltransform s_srs EPSG:28992 t_srs EPSG:31370
177502 311865
Produces the following output in meters in the “Belge 1972 / Belgian Lambert 72” projection:
244510.77404604 166154.532871342 1046.79270555763
Image RPC Example¶
The following command requests an RPC based transformation using the RPC model associated with the named file. Because the i (inverse) flag is used, the transformation is from output georeferenced (WGS84) coordinates back to image coordinates.
gdaltransform i rpc 06OCT20025052P2AS005553965230_01_P001.TIF
125.67206 39.85307 50
Produces this output measured in pixels and lines on the image:
3499.49282422381 2910.83892848414 50
X,Y,Z,time transform¶
15term timedependent Helmert coordinate transformation from ITRF2000 to ITRF93 for a coordinate at epoch 2000.0
gdaltransform ct "+proj=pipeline +step +proj=unitconvert +xy_in=deg \
+xy_out=rad +step +proj=cart +step +proj=helmert +convention=position_vector \
+x=0.0127 +dx=0.0029 +rx=0.00039 +drx=0.00011 +y=0.0065 +dy=0.0002 \
+ry=0.00080 +dry=0.00019 +z=0.0209 +dz=0.0006 +rz=0.00114 +drz=0.00007 \
+s=0.00195 +ds=0.00001 +t_epoch=1988.0 +step +proj=cart +inv +step \
+proj=unitconvert +xy_in=rad +xy_out=deg"
2 49 0 2000
Produces this output measured in longitude degrees, latitude degrees and ellipsoid height in metre:
2.0000005420366 49.0000003766711 0.0222802283242345