ecwhed [--help] [--version] [-a_ullr ulx uly lrx lry] [-co "DATUM=VALUE"] [-co "PROJ=VALUE"] file
The ecwhed utility is a viewer and editor for ECW files headers. The program can change the datum, projection and corner coordinates without decompressing and recompressing the image.
For instance, the georeferencing information contained in an ECW file can be displayed with a command like this:
ecwhed FRA-0100.ecw Datum = NTF Projection = LM2FRANC Origin = (223000.000000, 2152500.000000) Pixel Size = (100.000000, -100.000000) Corner Coordinates: Upper Left = (223000.000000, 2152500.000000) Upper Right = (547500.000000, 2152500.000000) Lower Left = (223000.000000, 1690000.000000) Lower Right = (547500.000000, 1690000.000000)
For instance, an ECW file can be georeferenced with a command like this:
ecwhed -co "DATUM=NTF" -co "PROJ=LM2FRANC" -a_ullr 970000 1860000 980000 1850000 map.ecw
The source code is available here : ecwhed-0.1.tar.gz . It is released under the GPL license version 2. To compile it, you will need the ECW SDK from ErMapper, that can be downloaded from the ErMapper web site.
Last Revision : 02/07/2008