<etrs89>    +ellps=GRS80  +towgs84=0,0,0          +proj=latlong                                                                        <> # Geograficas ETRS89
<pttm06>    +ellps=GRS80  +towgs84=0,0,0          +proj=tmerc    +lat_0=39d40'05.73"N +lon_0=08d07'59.19"W                             <> # PTTM06 do datum ETRS89
<etrs89utm> +ellps=GRS80  +towgs84=0,0,0          +proj=utm      +zone=29                                                              <> # UTM para fuso 29
<d73geo>    +ellps=intl   +nadgrids=pt73_e89.gsb  +proj=latlong                                                                        <> # Geograficas Datum 73
<d73hg>     +ellps=intl   +nadgrids=pt73_e89.gsb  +proj=tmerc    +lat_0=39d40         +lon_0=8d07'54.862"W   +x_0=180.598 +y_0=-86.990 <> # Hayford-Gauss datum 73 (IGP)
<dlxgeo>    +ellps=intl   +nadgrids=ptLX_e89.gsb  +proj=latlong                                                                        <> # Geograficas Datum Lisboa - Elips. Hayford
<dlxhg>     +ellps=intl   +nadgrids=ptLX_e89.gsb  +proj=tmerc    +lat_0=39d40         +lon_0=8d07'54.862"W                             <> # Hayford-Gauss datum Lisboa
<dlxhgmil>  +ellps=intl   +nadgrids=ptLX_e89.gsb  +proj=tmerc    +lat_0=39d40         +lon_0=8d07'54.862"W   +x_0=200000  +y_0=300000  <> # Hayford-Gauss datum Lisboa (militar)
<ed50geo>   +ellps=intl   +nadgrids=ptED_e89.gsb  +proj=latlong                                                                        <> # Geograficas ED50 
<ed50utm>   +ellps=intl   +nadgrids=ptED_e89.gsb  +proj=utm      +zone=29                                                              <> # UTM 29-N Datum Europeu 1950
<dlxbgeo>   +ellps=bessel +nadgrids=ptLB_e89.gsb  +proj=latlong                                                                        <> # Geograficas Datum Lisboa - Elipsoide de Bessel
<dlxbb>     +ellps=bessel +nadgrids=ptLB_e89.gsb  +proj=bonne    +lat_1=39d40         +lon_0=08d07'54.862"W                            <> # Sistema Bessel-Bonne

<4258>  +ellps=GRS80  +towgs84=0,0,0          +proj=latlong                                                                        <> # Geograficas ETRS89
<3763>  +ellps=GRS80  +towgs84=0,0,0          +proj=tmerc    +lat_0=39d40'05.73"N +lon_0=08d07'59.19"W                             <> # PTTM06 do datum ETRS89
<25829> +ellps=GRS80  +towgs84=0,0,0          +proj=utm      +zone=29                                                              <> # UTM para fuso 29
<4274>  +ellps=intl   +nadgrids=pt73_e89.gsb  +proj=latlong                                                                        <> # Geograficas Datum 73
<27493> +ellps=intl   +nadgrids=pt73_e89.gsb  +proj=tmerc    +lat_0=39d40         +lon_0=8d07'54.862"W   +x_0=180.598 +y_0=-86.990 <> # Hayford-Gauss datum 73 (IGP)
<4270>  +ellps=intl   +nadgrids=ptLX_e89.gsb  +proj=latlong                                                                        <> # Geograficas Datum Lisboa - Elips. Hayford
<27091> +ellps=intl   +nadgrids=ptLX_e89.gsb  +proj=tmerc    +lat_0=39d40         +lon_0=8d07'54.862"W                             <> # Hayford-Gauss datum Lisboa
<27090> +ellps=intl   +nadgrids=ptLX_e89.gsb  +proj=tmerc    +lat_0=39d40         +lon_0=8d07'54.862"W   +x_0=200000  +y_0=300000  <> # Hayford-Gauss datum Lisboa (militar)
<4230>  +ellps=intl   +nadgrids=ptED_e89.gsb  +proj=latlong                                                                        <> # Geograficas ED50 
<23029> +ellps=intl   +nadgrids=ptED_e89.gsb  +proj=utm      +zone=29                                                              <> # UTM 29-N Datum Europeu 1950
<4666>  +ellps=bessel +nadgrids=ptLB_e89.gsb  +proj=latlong                                                                        <> # Geograficas Datum Lisboa - Elipsoide de Bessel
<2963>  +ellps=bessel +nadgrids=ptLB_e89.gsb  +proj=bonne    +lat_1=39d40         +lon_0=08d07'54.862"W                            <> # Sistema Bessel-Bonne