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NAME

       gdaltransform - gdaltransform transforms coordinates

SYNOPSIS

       gdaltransform [--help-general]
           [-i] [-s_srs srs_def] [-t_srs srs_def] [-to "NAME=VALUE"]
           [-order n] [-tps] [-rpc] [-geoloc]
           [-gcp pixel line easting northing [elevation]]*
           [srcfile [dstfile]]

DESCRIPTION

       The gdaltransform utility reprojects a list of coordinates into any
       supported projection,including GCP-based transformations.

       -s_srs srs def:
           source spatial reference set. The coordinate systems that can be
           passed are anything supported by the
           OGRSpatialReference.SetFromUserInput() call, which includes EPSG
           PCS and GCSes (ie. EPSG:4296), PROJ.4 declarations (as above), or
           the name of a .prf file containing well known text.

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

       -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.

       -gcppixel line easting northing [elevation]:
           Provide a GCP to be used for transformation (generally three or
           more are required)

       srcfile:
           File with source projection definition or GCP’s. If not given,
           source projection is read from the command-line -s_srs or -gcp
           parameters

       dstfile:
           File with destination projection definition.

       Coordinates are read as pairs (or triples) 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 gcp-based 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.

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 06OCT20025052-P2AS-005553965230_01_P001.TIF
       125.67206 39.85307 50

       Produces this output measured in pixels and lines on the image:

       3499.49282422381 2910.83892848414 50

AUTHORS

       Frank Warmerdam <warmerdam@pobox.com>, Jan Hartmann
       <j.l.h.hartmann@uva.nl>