Image (Re-)projections and Merging - Open Source Geospatial Tools: Applications in Earth Observation - page 118

(2 ⓦ 24 36 51 ⓦ 18 36 ). The transformed coordinates are written to standard output
( screen).

Usage: gdaltransform [--help-general] [-i] [-s_srs srs_def]
ₒ [-t_srs srs_def] [-to"NAME=VALUE"] [-order n] [-tps]

ₒ

[-rpc] [-geoloc] [-gcp pixel line easting northing

ₒ

[elevation]]* [srcfile [dstfile]]

-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 GDALCreateGenImgProjTrans-
former2().
-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 aGCP to be used for transformation (generally three ormore 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.

We will start with a simple example, reprojecting coordinates from EPSG:28992
to EPSG:31370