I want to divide a whole raster map image into map sheets.
The gdal tiling or clipping functionality doesn't seem to do it.
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A single 1:1M map sheet can be reprojected and extracted with the following command:
gdalwarp -t_srs WGS84 -te 144 -36 150 -32 -crop_to_cutline 76943_Aus t_gda94.ecw AustTopo250_SI55.tif
This is dependent on an ecw driver being loaded.
Thanks to @user30184 for the tip:
GDAL tools does not have a ready made tool for cutting by map sheets. Gdal_translate has a -projwin and gdal_warp has a -te parameter which can be used for clipping one area at a time. You must make a batch file or script which is feeding the extents of your mapsheets one by one into these parameters.