The RSO projection method for Malaysia is now classified by epsg-registry.org as Hotine Oblique Mercator (variant A) EPSG:9812. This affects the following projections - EPSG:3168, EPSG:3375, EPSG:3376 among others.
At the moment, I get the following outputs from epsg_tr.py: epsg_tr.py -proj4 3618 # Kertau (RSO) / RSO Malaya (m) <3168> +proj=omerc +lat_0=4 +lonc=102.25 +alpha=323.0257905 +k=0.99984 +x_0=804670.24 +y_0=0 +a=6377295.664 +b=6356094.667915204 +units=m +no_defs <> epsg_tr.py -proj4 3375 <3375> +proj=omerc +lat_0=4 +lonc=102.25 +alpha=323.0257964666666 +k=0.99984 +x_0=804671 +y_0=0 +ellps=GRS80 +units=m +no_defs <> which are missing the +gamma parameter. This parameter (Rectified Grid Angle) is already included in the share/proj/epsg database: # Kertau (RSO) / RSO Malaya (m) <3168> +proj=omerc +lat_0=4 +lonc=102.25 +alpha=323.0257905 +k=0.99984 +x_0=804670.24 +y_0=0 +gamma=323.1301023611111 +a=6377295.664 +b=6356094.667915204 +units=m +no_defs <> # GDM2000 / Peninsula RSO <3375> +proj=omerc +lat_0=4 +lonc=102.25 +alpha=323.0257964666666 +k=0.99984 +x_0=804671 +y_0=0 +gamma=323.1301023611111 +ellps=GRS80 +units=m +no_defs <> Can this parameter be added to these projections as it is being applied in the latest proj4 omerc.c? Thanks *Hilmy*
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