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+# README.pt_dgt
+
+The files in this section result from the conversion of datasets originating
+from [DG Territorio](http://www.dgterritorio.pt/)
+
+## Included grids
+
+### Portugal: Lisbon Datum -> ETRS89
+
+Grid transformation from Portuguese Lisbon Datum to ETRS89 in Portugal.
+
+*Source*: [DGT](http://www.dgterritorio.pt/cartografia_e_geodesia/geodesia/transformacao_de_coordenadas/grelhas_em_ntv2/)  
+*Format*: GeoTIFF converted from NTv2  
+*License*: [Creative Commons Attribution 4.0](http://creativecommons.org/licenses/by/4.0/)  
+*Credit*: (c)2019 Directorate-General for the Territorial Development.
+
+Derived from 1129 common stations in the national geodetic network. 
+Residuals at 130 further test points average 0.09m, maximum 0.30m.
+Recommended to transform from Portuguese Lisbon Datum (EPSG:20790) to ETRS89 in Portugal (EPSG:3763).
+
+* DLx_ETRS89_geo.tif
+
+### Portugal: Datum 73 -> ETRS89
+
+Grid transformation from Portuguese Datum 73 to ETRS89 in Portugal.
+
+*Source*: [DGT](http://www.dgterritorio.pt/cartografia_e_geodesia/geodesia/transformacao_de_coordenadas/grelhas_em_ntv2/)  
+*Format*: GeoTIFF converted from NTv2  
+*License*: [Creative Commons Attribution 4.0](http://creativecommons.org/licenses/by/4.0/)  
+*Credit*: (c)2019 Directorate-General for the Territorial Development.
+
+Derived from 1129 common stations in the national geodetic network. 
+Residuals at 130 further test points average 0.06m, maximum 0.16m.
+Recommended to transform from Portuguese Datum 73 (EPSG:27493) to ETRS89 in Portugal (EPSG:3763).
+
+* D73_ETRS89_geo.tif